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#1
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Kiln drying STEEL?
I saw a guy going over some hot-rolled steel bar with a blow torch
recently. When I asked what he was doing he said he was evaporating the moisture from it. Sure enough - I watched it myself. The process is that he'll fabricate the chair, blow torch the whole thing, then rub beeswax all over it. Seems pretty labor intensive. I'm wondering if we couldn't just put the whole dozen chairs in our wood kiln for a few days and achieve the same effect. Any thoughts. JP ************************************************* Also posted to rec.crafts.metalworking |
#2
Posted to rec.woodworking
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Kiln drying STEEL?
Jay Pique wrote:
I saw a guy going over some hot-rolled steel bar with a blow torch recently. When I asked what he was doing he said he was evaporating the moisture from it. Sure enough - I watched it myself. The process is that he'll fabricate the chair, blow torch the whole thing, then rub beeswax all over it. Seems pretty labor intensive. I'm wondering if we couldn't just put the whole dozen chairs in our wood kiln for a few days and achieve the same effect. Any thoughts. Don't see why not if he's not counting on the torch flame doing something--certainly the kiln heat would be sufficient for surface moisture. -- |
#3
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Kiln drying STEEL?
dpb wrote:
Jay Pique wrote: I saw a guy going over some hot-rolled steel bar with a blow torch recently. When I asked what he was doing he said he was evaporating the moisture from it. Sure enough - I watched it myself. The process is that he'll fabricate the chair, blow torch the whole thing, then rub beeswax all over it. Seems pretty labor intensive. I'm wondering if we couldn't just put the whole dozen chairs in our wood kiln for a few days and achieve the same effect. Any thoughts. Don't see why not if he's not counting on the torch flame doing something--certainly the kiln heat would be sufficient for surface moisture. -- Could he be burning the milling oil from the steel before he paints it? That would be the quickest way I could think of to get rid of it completely. I don't think the blow torch would be hot enough to remove the stress from the metal in the recent fabricated piece. |
#4
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Kiln drying STEEL?
On Fri, 19 Sep 2008 14:52:48 -0700 (PDT), Jay Pique
wrote: I'm wondering if we couldn't just put the whole dozen chairs in our wood kiln for a few days and achieve the same effect. Any thoughts. My thoughts are that if it's moisture you're trying to get rid of, just set 'em out in the open sun for a couple of hours. Refinished some lawn furniture recently. Used a pressure washer to knock off loose paint. Left them out in the sun for a couple of hours to dry, set them in the shade for a couple of hours to cool off, sprayed them. No problems. But, I don't think it was moisture the guy with the blowtorch was after. Like another poster surmised, it was probably mill oil he was burning off. Tom Veatch Wichita, KS USA |
#5
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Kiln drying STEEL?
On Sep 19, 9:23*pm, Tom Veatch wrote:
But, I don't think it was moisture the guy with the blowtorch was after. Like another poster surmised, it was probably mill oil he was burning off. Now that's interesting. The whole story is this. One of our guys and a metalworker built a table for a client. It's made from pieces of hot-rolled steel that had further been cold bent into curves. They welded together the parts, sanded it and then applied a coat of beeswax. And it rusted. So now the metalworker thinks that if he heats the steel really well it will evaporate trapped moisture and then they'll seal it out with beeswax. (I know, I know....) In any event, since it sounds like it's not moisture they're burning off anyhow, the whole question of whether a kiln would work is pretty much moot. (Obviously wouldn't be hot enough to burn off oil, either.) Now for the real question - how do we prevent this table and chairs from rusting? Not much response from the metalworkers grumble. JP |
#6
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Kiln drying STEEL?
Jay Pique wrote:
.... Now for the real question - how do we prevent this table and chairs from rusting? Not much response from the metalworkers grumble. Has to be an impervious coating of some sort. Depends on what look is wanted, cold bluing could do or powder coat or even painting. -- |
#7
Posted to rec.woodworking,rec.crafts.metalworking
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Kiln drying STEEL?
On Sep 19, 10:08*pm, Jay Pique wrote:
On Sep 19, 9:23*pm, Tom Veatch wrote: But, I don't think it was moisture the guy with the blowtorch was after. Like another poster surmised, it was probably mill oil he was burning off. Now that's interesting. *The whole story is this. *One of our guys and a metalworker built a table for a client. *It's made from pieces of hot-rolled steel that had further been cold bent into curves. *They welded together the parts, sanded it and then applied a coat of beeswax. *And it rusted. *So now the metalworker thinks that if he heats the steel really well it will evaporate trapped moisture and then they'll seal it out with beeswax. *(I know, I know....) *In any event, since it sounds like it's not moisture they're burning off anyhow, the whole question of whether a kiln would work is pretty much moot. *(Obviously wouldn't be hot enough to burn off oil, either.) Now for the real question - how do we prevent this table and chairs from rusting? *Not much response from the metalworkers grumble. JP Not much response from the metalworkers because they're laughing too hard about the moisture "trapped" in the steel. Paint it. John Martin |
#8
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Kiln drying STEEL?
"Jay Pique" wrote Now for the real question - how do we prevent this table and chairs from rusting? Not much response from the metalworkers grumble. ********************** My comments on working with metal. Hot rolled steel is a lower quality steel and it will rust in a second. Particularly if you weld it. Cold rolled steel is smoother and does not rust as easily. If I absolutely did not want it to rust, I wirebrushed it with an angle grinder and immediately primered it. You can get primers for both clean metal and rusty metal. Steel tends to rust if heated anyway. One secret to a good paint job is similar to applying any kind of finish on any kind of surface. That is to make the surface absolutely clean and bare. And if it sits for a day or two, it will not be clean and pristine anymore. I used at least two angle grinders with wire brushes on them. I then used a hand wire brush. I then used some emory cloth. Then I got the primer on it. I used to make gym equipment. I was always being offered hot rolled round stock for cheap. The cold rolled stuff was at least half again as much and in some diameters, twice as much. The hot rolled crap would pit, rust and generally degrade before your eyes. Any piece that went out with hot rolled stock came back and had to be replaced. Other shops actually gave me a bunch of the hot rolled stock. I used it to build jigs, etc. I never used it personally in any of the good stuff I built. One good reason to make good welds is that there isn't any pits or cracks for the rust to grow in. Which is why all welds were ground if necessary. There is little need to grind a good weld. And the rust starts growing right next to the weld where the steel was heated. Rust is the enemy of any metal piece that must be smooth and/or must look good. Enough care in building it and a good clean up before painting helps a lot. HTH |
#9
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Kiln drying STEEL?
Jay Pique wrote:
Now for the real question - how do we prevent this table and chairs from rusting? Not much response from the metalworkers grumble. Clean 'em, polish 'em, gold-plate 'em. Apply a heavy coat of epoxy paint to protect the gold. :-) Suggest they use stainless for the next set. -- Morris Dovey DeSoto Solar DeSoto, Iowa USA http://www.iedu.com/DeSoto/ |
#10
Posted to rec.woodworking,rec.crafts.metalworking
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Kiln drying STEEL?
It's called hot dip galvanizing. It has been around a long time, it is
inexpensive and works very, very well. Steve "John Martin" wrote in message ... On Sep 19, 10:08 pm, Jay Pique wrote: On Sep 19, 9:23 pm, Tom Veatch wrote: But, I don't think it was moisture the guy with the blowtorch was after. Like another poster surmised, it was probably mill oil he was burning off. Now that's interesting. The whole story is this. One of our guys and a metalworker built a table for a client. It's made from pieces of hot-rolled steel that had further been cold bent into curves. They welded together the parts, sanded it and then applied a coat of beeswax. And it rusted. So now the metalworker thinks that if he heats the steel really well it will evaporate trapped moisture and then they'll seal it out with beeswax. (I know, I know....) In any event, since it sounds like it's not moisture they're burning off anyhow, the whole question of whether a kiln would work is pretty much moot. (Obviously wouldn't be hot enough to burn off oil, either.) Now for the real question - how do we prevent this table and chairs from rusting? Not much response from the metalworkers grumble. JP Not much response from the metalworkers because they're laughing too hard about the moisture "trapped" in the steel. Paint it. John Martin |
#11
Posted to rec.woodworking
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Kiln drying STEEL?
Jay Pique wrote:
On Sep 19, 9:23 pm, Tom Veatch wrote: But, I don't think it was moisture the guy with the blowtorch was after. Like another poster surmised, it was probably mill oil he was burning off. Now that's interesting. The whole story is this. One of our guys and a metalworker built a table for a client. It's made from pieces of hot-rolled steel that had further been cold bent into curves. They welded together the parts, sanded it and then applied a coat of beeswax. And it rusted. So now the metalworker thinks that if he heats the steel really well it will evaporate trapped moisture and then they'll seal it out with beeswax. (I know, I know....) In any event, since it sounds like it's not moisture they're burning off anyhow, the whole question of whether a kiln would work is pretty much moot. (Obviously wouldn't be hot enough to burn off oil, either.) Now for the real question - how do we prevent this table and chairs from rusting? Not much response from the metalworkers grumble. To how to keep it from rusting, Rust-Oleum works quite well. If you want something better, any automotive paint shop should have a wide range of systems intended specifically to work on steel and can match just about any color. Or you could go with the full MIL-SPEC system with MIL-T-8514 etch, MIL-P-23377 epoxy primer, and a MIL-PRF-85285 topcoat. If it has to have a metallic appearance then paint it with a metallic paint. If it is _all_ steel with no plastic or wooden or other parts, or if it can be dissasembled and all the non-steel parts removed, and if you can find a plating shop with a tank set up that is big enough to hold it then you could have the whole thing chromed (or plated with another metal of your choice, but don't count on anything but chrome being available without a significant set-up charge). This is going to be an expensive option, but will leave you with a durable shiny metal surface. Oh, and if the "metalworker" is one of your employees, you need to have a long talk with that boy. -- -- --John to email, dial "usenet" and validate (was jclarke at eye bee em dot net) |
#12
Posted to rec.woodworking
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Kiln drying STEEL?
Now for the real question - how do we prevent this table and chairs
from rusting? Not much response from the metalworkers grumble. On Sat, 20 Sep 2008 03:08:39 +0100, Jay Pique wrote (in article ): Now for the real question - how do we prevent this table and chairs from rusting? Not much response from the metalworkers grumble. JP Simple. Galvanize it. (or hot-dip it in zinc ) Powder coat? Red lead paint? I presume, however, that we want a "bare metal" industrial look to this otherwise we'd not be doing this kiln-drying and furniture polish thing? so galvanizing it is. Or nickel plate if it's a smooth polished look that's wanted- don't forget to specify over copper plate though else it'll get woodworm... Or keep it in a pure nitrogen environment if that's simpler, 'cos rust is caused by phlogiston escaping into impure atmospheres and contamination from bodily fluids umm.. Remake everything in stainless steel? Alumininuminum? Wood? meanwhile - beeswax? really? Where did these guys go to school? Oh...... I'll get me coat. |
#13
Posted to rec.woodworking,rec.crafts.metalworking
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Kiln drying STEEL?
On Sep 20, 4:04*am, "Steve Lusardi" wrote:
It's called hot dip galvanizing. It has been around a long time, it is inexpensive and works very, very well. Steve Could we fabricate the whole chair or table, then take it someplace to be dipped? Or do we have to assemble it from pre-dipped steel - in which case I gather we'd have rusting issues at the welded joints, right? I can't wait to unload a ration of crap....errr...."inform the metalworkers" on Monday! Thanks all. JP *********************************** Just scorping the seats. |
#14
Posted to rec.woodworking,rec.crafts.metalworking
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Kiln drying STEEL?
Jay Pique wrote:
On Sep 20, 4:04 am, "Steve Lusardi" wrote: It's called hot dip galvanizing. It has been around a long time, it is inexpensive and works very, very well. Steve Could we fabricate the whole chair or table, then take it someplace to be dipped? Or do we have to assemble it from pre-dipped steel - in which case I gather we'd have rusting issues at the welded joints, right? You need to call around to your local plating companies and find out what size tanks they normally have set up. I'd go with chrome over galvanized--hot dip galvanize isn't all that pretty a finish and plated zinc isn't very hard. Nickel is _very_ tough (it's used as protection on aircraft propellers) but doesn't stay shiny without regular polishing. How large a piece can be handled depends on how big a tank is available. If the tanks are large enough they should be able to do the whole table, although they may need to do some fiddling to get the electrodes placed for even coverage. Welding up from precoated steel means that you've lost the protection at the welds. A better option might be to make it in several subassemblies that can be bolted together--note--if you're using tapped holes, either tap them _after_ plating or plug them for plating. This really sounds like you might be ahead of the game to use stainless. I can't wait to unload a ration of crap....errr...."inform the metalworkers" on Monday! Thanks all. JP *********************************** Just scorping the seats. -- -- --John to email, dial "usenet" and validate (was jclarke at eye bee em dot net) |
#15
Posted to rec.woodworking,rec.crafts.metalworking
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Kiln drying STEEL?
Jay,
There is also another option, which may also be possible in your area. Not only can you hot dip in molten zinc, you can sandblast and metal spray with zinc. It is not as robust as hot dip, but allows the piece to be then powder coated in any color of your choice. Of course you can can also powder coat after hot dip as well. You will find that all 3 processes are very inexpensive and compete cost wise with quality paint, when all material and labor costs are included. Steve "Jay Pique" wrote in message ... On Sep 20, 4:04 am, "Steve Lusardi" wrote: It's called hot dip galvanizing. It has been around a long time, it is inexpensive and works very, very well. Steve Could we fabricate the whole chair or table, then take it someplace to be dipped? Or do we have to assemble it from pre-dipped steel - in which case I gather we'd have rusting issues at the welded joints, right? I can't wait to unload a ration of crap....errr...."inform the metalworkers" on Monday! Thanks all. JP *********************************** Just scorping the seats. |
#16
Posted to rec.woodworking
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Kiln drying STEEL?
On Sat, 20 Sep 2008 04:34:21 -0700 (PDT), Jay Pique
wrote: On Sep 20, 4:04*am, "Steve Lusardi" wrote: It's called hot dip galvanizing. It has been around a long time, it is inexpensive and works very, very well. Steve Could we fabricate the whole chair or table, then take it someplace to be dipped? Or do we have to assemble it from pre-dipped steel - in which case I gather we'd have rusting issues at the welded joints, right? Hell.. Do a flashback and have it chromed.. lol mac Please remove splinters before emailing |
#17
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Kiln drying STEEL?
Lacquer.
"Jay Pique" wrote in message ... On Sep 19, 9:23 pm, Tom Veatch wrote: But, I don't think it was moisture the guy with the blowtorch was after. Like another poster surmised, it was probably mill oil he was burning off. Now that's interesting. The whole story is this. One of our guys and a metalworker built a table for a client. It's made from pieces of hot-rolled steel that had further been cold bent into curves. They welded together the parts, sanded it and then applied a coat of beeswax. And it rusted. So now the metalworker thinks that if he heats the steel really well it will evaporate trapped moisture and then they'll seal it out with beeswax. (I know, I know....) In any event, since it sounds like it's not moisture they're burning off anyhow, the whole question of whether a kiln would work is pretty much moot. (Obviously wouldn't be hot enough to burn off oil, either.) Now for the real question - how do we prevent this table and chairs from rusting? Not much response from the metalworkers grumble. JP |
#18
Posted to rec.woodworking,rec.crafts.metalworking
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Kiln drying STEEL?
On Sat, 20 Sep 2008 08:51:52 -0400, "J. Clarke"
wrote: You need to call around to your local plating companies and find out what size tanks they normally have set up. I'd go with chrome over galvanized--hot dip galvanize isn't all that pretty a finish and plated zinc isn't very hard. Nickel is _very_ tough (it's used as protection on aircraft propellers) but doesn't stay shiny without regular polishing. How large a piece can be handled depends on how big a tank is available. now where did you get that silly idea from??? name the propeller that uses a nickle coating???? Stealth Pilot |
#19
Posted to rec.woodworking,rec.crafts.metalworking
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Kiln drying STEEL?
Stealth Pilot wrote:
On Sat, 20 Sep 2008 08:51:52 -0400, "J. Clarke" wrote: You need to call around to your local plating companies and find out what size tanks they normally have set up. I'd go with chrome over galvanized--hot dip galvanize isn't all that pretty a finish and plated zinc isn't very hard. Nickel is _very_ tough (it's used as protection on aircraft propellers) but doesn't stay shiny without regular polishing. How large a piece can be handled depends on how big a tank is available. now where did you get that silly idea from??? name the propeller that uses a nickle coating???? Hamilton-Standard 54460 and 24PF are two examples that use a bonded-on sheath over the outer portion of the blade leading edge. You can see them on a 54460 at http://www.flickr.com/photos/goldorak/417313975/. The new 8-way that replaced the 54460 on the E2 is another--you can see the sheath clearly at http://www.flickr.com/photos/kensaviation/1896504667/. Those sheathes are plated on a mandrel then removed from the mandrel, trimmed, and bonded to the blade. There is also a process involving plating nickel over conductive rubber--the rubber prevents cracks in the nickel from propagating into the blade. Don't recall where all that was used--some 54H60 variants for hovercraft use had it and I recall vaguely that it was used on the 63E60 in a similar application--it's been a long time and the 63E60 was past its prime when I was working at Hamilton. If you ever fly on a propeller-driven commuter airliner, look closely at the blades and you'll see the sheath unless it's been painted over, which it's not supposed to be except along the edges. Carbon black in the paint, which is electrically conductive to bleed static off the blade, tends to corrode the nickel. As to how I happen to know this, my first job out of college was as a project engineer in the Blade Group at United Technologies Hamilton Standard and my area of specialization was erosion protection. -- -- --John to email, dial "usenet" and validate (was jclarke at eye bee em dot net) |
#20
Posted to rec.woodworking,rec.crafts.metalworking
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Kiln drying STEEL?
Stealth Pilot wrote:
name the propeller that uses a nickle coating???? Stealth Pilot I've seen lots of polished spinners, but no polished props. |
#21
Posted to rec.woodworking,rec.crafts.metalworking
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Kiln drying STEEL?
J. Clarke wrote:
If you ever fly on a propeller-driven commuter airliner, look closely at the blades and you'll see the sheath unless it's been painted over, which it's not supposed to be except along the edges. Carbon black in the paint, which is electrically conductive to bleed static off the blade, tends to corrode the nickel. John, Isn't that section of the prop heated for ice protection? |
#22
Posted to rec.woodworking,rec.crafts.metalworking
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Kiln drying STEEL?
B A R R Y wrote:
J. Clarke wrote: If you ever fly on a propeller-driven commuter airliner, look closely at the blades and you'll see the sheath unless it's been painted over, which it's not supposed to be except along the edges. Carbon black in the paint, which is electrically conductive to bleed static off the blade, tends to corrode the nickel. John, Isn't that section of the prop heated for ice protection? Centrifugal force takes the ice right off outboard, the prop deicers are on the inboard end and the spinner On an older commuter airliner like the DHC-7 you can see the heater as a rubber piece bonded onto the blade. In http://www.flickr.com/photos/clearsk...hy/1218007750/ you can see the heaters on a solid aluminum blade if you look carefully--there's a foam cuff inboard with a rubber covering, but on top of that there's a deicer attached--you can see the edge of it about 1/3 of the way back on the top left blade. The little tab that sticks up is part of the heater but isn't itself heated. The shiny strip along the leading edge is likely where dust and rain and whatnot have eroded the anodize off the blade, although the Dutch may have painted it for some reason. The tips would have been repainted recently. http://www.flickr.com/photos/cmphoto/2505031128/ shows a different model of that prop (both the P-3 and the C-130 use the 54H60 but with different blade tips--nobody ever told me why the difference). http://www.flickr.com/photos/cmphoto/2530724870/ shows the heater very clearly. Note the clear tape at the ends of the heater--that's one that I haven't seen before on that prop but would bet that it's polyurethane tape that's there to protect the outer edge of the heater--the outer few inches of those heaters would wear through long before the rest and the polyurethane tape was an approved modification on the commuter airliners when I left the company--it's very likely that someone after me got it approved for that use on the P-3. http://www.flickr.com/photos/78436618@N00/2497802331/ is another with a clear view of the heaters--on this one they've been cut back a little bit--not sure if it's far enough to get into the wires or not--but that's the area that would wear through. -- -- --John to email, dial "usenet" and validate (was jclarke at eye bee em dot net) |
#23
Posted to rec.woodworking,rec.crafts.metalworking
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Kiln drying STEEL?
On Sun, 21 Sep 2008 04:57:52 -0400, "J. Clarke"
wrote: Stealth Pilot wrote: On Sat, 20 Sep 2008 08:51:52 -0400, "J. Clarke" wrote: You need to call around to your local plating companies and find out what size tanks they normally have set up. I'd go with chrome over galvanized--hot dip galvanize isn't all that pretty a finish and plated zinc isn't very hard. Nickel is _very_ tough (it's used as protection on aircraft propellers) but doesn't stay shiny without regular polishing. How large a piece can be handled depends on how big a tank is available. now where did you get that silly idea from??? name the propeller that uses a nickle coating???? Hamilton-Standard 54460 and 24PF are two examples that use a bonded-on sheath over the outer portion of the blade leading edge. You can see them on a 54460 at http://www.flickr.com/photos/goldorak/417313975/. The new 8-way that replaced the 54460 on the E2 is another--you can see the sheath clearly at http://www.flickr.com/photos/kensaviation/1896504667/. Those sheathes are plated on a mandrel then removed from the mandrel, trimmed, and bonded to the blade. There is also a process involving plating nickel over conductive rubber--the rubber prevents cracks in the nickel from propagating into the blade. Don't recall where all that was used--some 54H60 variants for hovercraft use had it and I recall vaguely that it was used on the 63E60 in a similar application--it's been a long time and the 63E60 was past its prime when I was working at Hamilton. If you ever fly on a propeller-driven commuter airliner, look closely at the blades and you'll see the sheath unless it's been painted over, which it's not supposed to be except along the edges. Carbon black in the paint, which is electrically conductive to bleed static off the blade, tends to corrode the nickel. As to how I happen to know this, my first job out of college was as a project engineer in the Blade Group at United Technologies Hamilton Standard and my area of specialization was erosion protection. alright you got me there :-) hovercraft props!!!! I dont recall seeing the leading edges you mention on commuter turbo props but I'll believe you. most props are forged 2025 aloominum with an anodised surface hardening. the polished prop effect is achieved by wearing off all the anodising and polishing the remaining aloominum. the leading edge treatments I can recall are more like icing cuffs or polyurethane tapes. seriously though I do believe you on the hovercraft props. Stealth ( Hovercraft props!?!?) Pilot |
#24
Posted to rec.woodworking,rec.crafts.metalworking
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Kiln drying STEEL?
Stealth Pilot wrote:
On Sun, 21 Sep 2008 04:57:52 -0400, "J. Clarke" wrote: Stealth Pilot wrote: On Sat, 20 Sep 2008 08:51:52 -0400, "J. Clarke" wrote: You need to call around to your local plating companies and find out what size tanks they normally have set up. I'd go with chrome over galvanized--hot dip galvanize isn't all that pretty a finish and plated zinc isn't very hard. Nickel is _very_ tough (it's used as protection on aircraft propellers) but doesn't stay shiny without regular polishing. How large a piece can be handled depends on how big a tank is available. now where did you get that silly idea from??? name the propeller that uses a nickle coating???? Hamilton-Standard 54460 and 24PF are two examples that use a bonded-on sheath over the outer portion of the blade leading edge. You can see them on a 54460 at http://www.flickr.com/photos/goldorak/417313975/. The new 8-way that replaced the 54460 on the E2 is another--you can see the sheath clearly at http://www.flickr.com/photos/kensaviation/1896504667/. Those sheathes are plated on a mandrel then removed from the mandrel, trimmed, and bonded to the blade. There is also a process involving plating nickel over conductive rubber--the rubber prevents cracks in the nickel from propagating into the blade. Don't recall where all that was used--some 54H60 variants for hovercraft use had it and I recall vaguely that it was used on the 63E60 in a similar application--it's been a long time and the 63E60 was past its prime when I was working at Hamilton. If you ever fly on a propeller-driven commuter airliner, look closely at the blades and you'll see the sheath unless it's been painted over, which it's not supposed to be except along the edges. Carbon black in the paint, which is electrically conductive to bleed static off the blade, tends to corrode the nickel. As to how I happen to know this, my first job out of college was as a project engineer in the Blade Group at United Technologies Hamilton Standard and my area of specialization was erosion protection. alright you got me there :-) hovercraft props!!!! I dont recall seeing the leading edges you mention on commuter turbo props but I'll believe you. most props are forged 2025 aloominum with an anodised surface hardening. the polished prop effect is achieved by wearing off all the anodising and polishing the remaining aloominum. the leading edge treatments I can recall are more like icing cuffs or polyurethane tapes. seriously though I do believe you on the hovercraft props. I think that the term for the sort of commercial aircraft that would have Hamilton props is "regional" airliners these days. The C-130 and P-3 have 7075 blades (note, not 707_6_--Hamilton props are about the only place that 7075 is used and Alcoa used to have to run special lots for Hamilton). The Hamilton commuter props have a fiberglass or Kevlar shell over an aluminum spar, which may be 2024--I honestly don't recall what they were using on those spars. The 54460 on the E-2 had a fiberglass shell over a steel spar--don't know what they're doing on the new 8-way. If you look at the photos of that prop on flickr you'll see that inboard of the nickel sheath the leading edge is smooth--the deicer is molded into the fiberglass--the wires are stitched into place during layup. The 24PF had a glue-on rubber heater, but the newer ones have gone to the integral heater. Here are a few that show the sheathes more or less well: http://www.flickr.com/photos/thomasbecker/2290167447/ http://www.flickr.com/photos/kensavi...59395/sizes/o/ http://www.flickr.com/photos/redteam/2384048553/ http://www.flickr.com/photos/mrottler/2112446280/ http://www.flickr.com/photos/capital...98062/sizes/l/ Good clear prop close-ups are rare. By the way, those polyurethane strips--I'm the guy who got the first one certificated, for the 24PF on the DHC-7. Stealth ( Hovercraft props!?!?) Pilot -- -- --John to email, dial "usenet" and validate (was jclarke at eye bee em dot net) |
#25
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Kiln drying STEEL?
On Sun, 21 Sep 2008 08:14:24 -0400, "J. Clarke"
wrote: B A R R Y wrote: J. Clarke wrote: If you ever fly on a propeller-driven commuter airliner, look closely at the blades and you'll see the sheath unless it's been painted over, which it's not supposed to be except along the edges. Carbon black in the paint, which is electrically conductive to bleed static off the blade, tends to corrode the nickel. John, Isn't that section of the prop heated for ice protection? Centrifugal force centripetal force and inertia exist. centrifugal force is a misnomer. Stealth pilot |
#26
Posted to rec.woodworking,rec.crafts.metalworking
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Kiln drying STEEL?
Stealth Pilot wrote:
On Sun, 21 Sep 2008 08:14:24 -0400, "J. Clarke" wrote: B A R R Y wrote: J. Clarke wrote: If you ever fly on a propeller-driven commuter airliner, look closely at the blades and you'll see the sheath unless it's been painted over, which it's not supposed to be except along the edges. Carbon black in the paint, which is electrically conductive to bleed static off the blade, tends to corrode the nickel. John, Isn't that section of the prop heated for ice protection? Centrifugal force centripetal force and inertia exist. centrifugal force is a misnomer. rolling eyes Most engineers don't have time to write book every time they refer to the mechanism by which water is retained in a bucket that is swung in vertical circles on the end of a rope. We just call it "centrifugal force" and recognize that that's shorthand for a long-winded explanation and get on with life. -- -- --John to email, dial "usenet" and validate (was jclarke at eye bee em dot net) |
#27
Posted to rec.woodworking,rec.crafts.metalworking
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[OT] Kiln drying STEEL?
J. Clarke wrote:
rolling eyes Most engineers don't have time to write book every time they refer to the mechanism by which water is retained in a bucket that is swung in vertical circles on the end of a rope. We just call it "centrifugal force" and recognize that that's shorthand for a long-winded explanation and get on with life. LOL - Just thinking of the fortune you (I/we) passed up by not selling a rubber stamp with this explanation... :-D -- Morris Dovey DeSoto Solar DeSoto, Iowa USA http://www.iedu.com/DeSoto/ |
#28
Posted to rec.woodworking,rec.crafts.metalworking
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Kiln drying STEEL?
On 20 Sep, 12:34, Jay Pique wrote:
Could we fabricate the whole chair or table, then take it someplace to be dipped? * Here's a worst-case example: lots of thin strip, hot-dipped afterwards. £50 (minimum charge) to do a couple of them (or a few more) http://jarkman.co.uk/catalog/furnitur/suchair.htm You can't chrome plate over zinc though |
#29
Posted to rec.woodworking,rec.crafts.metalworking
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Kiln drying STEEL?
On Sun, 21 Sep 2008 10:08:28 -0400, "J. Clarke"
wrote: The C-130 and P-3 have 7075 blades (note, not 707_6_--Hamilton props are about the only place that 7075 is used and Alcoa used to have to run special lots for Hamilton). The Hamilton commuter props have a fiberglass or Kevlar shell over an aluminum spar, which may be 2024--I honestly don't recall what they were using on those spars. The 54460 on the E-2 had a fiberglass shell over a steel spar--don't know what they're doing on the new 8-way. If you look at the photos of that prop on flickr you'll see that inboard of the nickel sheath the leading edge is smooth--the deicer is molded into the fiberglass--the wires are stitched into place during layup. The 24PF had a glue-on rubber heater, but the newer ones have gone to the integral heater. Here are a few that show the sheathes more or less well: http://www.flickr.com/photos/thomasbecker/2290167447/ http://www.flickr.com/photos/kensavi...59395/sizes/o/ http://www.flickr.com/photos/redteam/2384048553/ http://www.flickr.com/photos/mrottler/2112446280/ http://www.flickr.com/photos/capital...98062/sizes/l/ Good clear prop close-ups are rare. By the way, those polyurethane strips--I'm the guy who got the first one certificated, for the 24PF on the DHC-7. Stealth ( Hovercraft props!?!?) Pilot -- suave stuff! what aerofoil family(s) did you use? what limiting tip speed did you work to? this area of aviation seems to one of the least publicly documented areas and yet it is one of the most important. Stealth Pilot |
#30
Posted to rec.woodworking,rec.crafts.metalworking
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Kiln drying STEEL?
Stealth Pilot wrote:
On Sun, 21 Sep 2008 10:08:28 -0400, "J. Clarke" wrote: The C-130 and P-3 have 7075 blades (note, not 707_6_--Hamilton props are about the only place that 7075 is used and Alcoa used to have to run special lots for Hamilton). The Hamilton commuter props have a fiberglass or Kevlar shell over an aluminum spar, which may be 2024--I honestly don't recall what they were using on those spars. The 54460 on the E-2 had a fiberglass shell over a steel spar--don't know what they're doing on the new 8-way. If you look at the photos of that prop on flickr you'll see that inboard of the nickel sheath the leading edge is smooth--the deicer is molded into the fiberglass--the wires are stitched into place during layup. The 24PF had a glue-on rubber heater, but the newer ones have gone to the integral heater. Here are a few that show the sheathes more or less well: http://www.flickr.com/photos/thomasbecker/2290167447/ http://www.flickr.com/photos/kensavi...59395/sizes/o/ http://www.flickr.com/photos/redteam/2384048553/ http://www.flickr.com/photos/mrottler/2112446280/ http://www.flickr.com/photos/capital...98062/sizes/l/ Good clear prop close-ups are rare. By the way, those polyurethane strips--I'm the guy who got the first one certificated, for the 24PF on the DHC-7. Stealth ( Hovercraft props!?!?) Pilot -- suave stuff! what aerofoil family(s) did you use? I've long since forgotten--I seem to recall that they were from a family developed specifically for propeller use. Wasn't something I normally had to deal with. what limiting tip speed did you work to? Not a number I ever carried in my head. The only one that sticks is 1050 RPM as the governed RPM for the 54H60 (note--adjusting the RPM on that prop was a maintenance item, not a cockpit control). You can work from that to the tip speed. Of course Hamilton built supersonic props but I don't know for sure that they ever flew--the one on the XF-84H doesn't look like the drawings and components I saw (_really_ wish I could have taken pictures in the shop, but cameras other than in the hands of the official photographer were strictly forbidden, there was all sorts of historically interesting stuff racked in odd corners which has probably been lost now), which suggests that it was the Curtiss design--the project was supposed to test several prop variants but the airframe proved to be unsatisfactory for the purpose and rather than fix it the project was cancelled. Never encountered anybody who was willing to talk about it. this area of aviation seems to one of the least publicly documented areas and yet it is one of the most important. Somebody really needs to write a history of the aircraft propeller before it's lost. -- -- --John to email, dial "usenet" and validate (was jclarke at eye bee em dot net) |
#31
Posted to rec.woodworking
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Kiln drying STEEL?
In article ,
Jay Pique wrote: ...snipped... Now for the real question - how do we prevent this table and chairs from rusting? Not much response from the metalworkers grumble. JP For ordinary hotrolled mild steel? The traditional solution is paint. If you want the bare steel look I suppose you could use varnish or laquer. -- Better to be stuck up in a tree than tied to one. Larry Wasserman - Baltimore Maryland - lwasserm(a)sdf. lonestar.org |
#32
Posted to rec.woodworking,rec.crafts.metalworking
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Kiln drying STEEL?
On Mon, 22 Sep 2008 08:39:49 -0400, "J. Clarke"
wrote: Stealth Pilot wrote: On Sun, 21 Sep 2008 10:08:28 -0400, "J. Clarke" wrote: The C-130 and P-3 have 7075 blades (note, not 707_6_--Hamilton props are about the only place that 7075 is used and Alcoa used to have to run special lots for Hamilton). The Hamilton commuter props have a fiberglass or Kevlar shell over an aluminum spar, which may be 2024--I honestly don't recall what they were using on those spars. The 54460 on the E-2 had a fiberglass shell over a steel spar--don't know what they're doing on the new 8-way. If you look at the photos of that prop on flickr you'll see that inboard of the nickel sheath the leading edge is smooth--the deicer is molded into the fiberglass--the wires are stitched into place during layup. The 24PF had a glue-on rubber heater, but the newer ones have gone to the integral heater. Here are a few that show the sheathes more or less well: http://www.flickr.com/photos/thomasbecker/2290167447/ http://www.flickr.com/photos/kensavi...59395/sizes/o/ http://www.flickr.com/photos/redteam/2384048553/ http://www.flickr.com/photos/mrottler/2112446280/ http://www.flickr.com/photos/capital...98062/sizes/l/ Good clear prop close-ups are rare. By the way, those polyurethane strips--I'm the guy who got the first one certificated, for the 24PF on the DHC-7. Stealth ( Hovercraft props!?!?) Pilot -- suave stuff! what aerofoil family(s) did you use? I've long since forgotten--I seem to recall that they were from a family developed specifically for propeller use. Wasn't something I normally had to deal with. what limiting tip speed did you work to? Not a number I ever carried in my head. The only one that sticks is 1050 RPM as the governed RPM for the 54H60 (note--adjusting the RPM on that prop was a maintenance item, not a cockpit control). You can work from that to the tip speed. Of course Hamilton built supersonic props but I don't know for sure that they ever flew--the one on the XF-84H doesn't look like the drawings and components I saw (_really_ wish I could have taken pictures in the shop, but cameras other than in the hands of the official photographer were strictly forbidden, there was all sorts of historically interesting stuff racked in odd corners which has probably been lost now), which suggests that it was the Curtiss design--the project was supposed to test several prop variants but the airframe proved to be unsatisfactory for the purpose and rather than fix it the project was cancelled. Never encountered anybody who was willing to talk about it. this area of aviation seems to one of the least publicly documented areas and yet it is one of the most important. Somebody really needs to write a history of the aircraft propeller before it's lost. -- a very good point. what are you doing later this week? :-) it would make a very good retirement project. ....go on give it a go. Stealth (seriously) Pilot |
#33
Posted to rec.woodworking,rec.crafts.metalworking
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Kiln drying STEEL?
Stealth Pilot wrote:
On Mon, 22 Sep 2008 08:39:49 -0400, "J. Clarke" wrote: Stealth Pilot wrote: On Sun, 21 Sep 2008 10:08:28 -0400, "J. Clarke" wrote: The C-130 and P-3 have 7075 blades (note, not 707_6_--Hamilton props are about the only place that 7075 is used and Alcoa used to have to run special lots for Hamilton). The Hamilton commuter props have a fiberglass or Kevlar shell over an aluminum spar, which may be 2024--I honestly don't recall what they were using on those spars. The 54460 on the E-2 had a fiberglass shell over a steel spar--don't know what they're doing on the new 8-way. If you look at the photos of that prop on flickr you'll see that inboard of the nickel sheath the leading edge is smooth--the deicer is molded into the fiberglass--the wires are stitched into place during layup. The 24PF had a glue-on rubber heater, but the newer ones have gone to the integral heater. Here are a few that show the sheathes more or less well: http://www.flickr.com/photos/thomasbecker/2290167447/ http://www.flickr.com/photos/kensavi...59395/sizes/o/ http://www.flickr.com/photos/redteam/2384048553/ http://www.flickr.com/photos/mrottler/2112446280/ http://www.flickr.com/photos/capital...98062/sizes/l/ Good clear prop close-ups are rare. By the way, those polyurethane strips--I'm the guy who got the first one certificated, for the 24PF on the DHC-7. Stealth ( Hovercraft props!?!?) Pilot -- suave stuff! what aerofoil family(s) did you use? I've long since forgotten--I seem to recall that they were from a family developed specifically for propeller use. Wasn't something I normally had to deal with. what limiting tip speed did you work to? Not a number I ever carried in my head. The only one that sticks is 1050 RPM as the governed RPM for the 54H60 (note--adjusting the RPM on that prop was a maintenance item, not a cockpit control). You can work from that to the tip speed. Of course Hamilton built supersonic props but I don't know for sure that they ever flew--the one on the XF-84H doesn't look like the drawings and components I saw (_really_ wish I could have taken pictures in the shop, but cameras other than in the hands of the official photographer were strictly forbidden, there was all sorts of historically interesting stuff racked in odd corners which has probably been lost now), which suggests that it was the Curtiss design--the project was supposed to test several prop variants but the airframe proved to be unsatisfactory for the purpose and rather than fix it the project was cancelled. Never encountered anybody who was willing to talk about it. this area of aviation seems to one of the least publicly documented areas and yet it is one of the most important. Somebody really needs to write a history of the aircraft propeller before it's lost. -- a very good point. what are you doing later this week? :-) it would make a very good retirement project. ...go on give it a go. If I thought there was a real chance that I was ever going to retire that would be a fine idea. -- -- --John to email, dial "usenet" and validate (was jclarke at eye bee em dot net) |
#34
Posted to rec.woodworking,rec.crafts.metalworking
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Kiln drying STEEL?
J. Clarke wrote:
Somebody really needs to write a history of the aircraft propeller before it's lost. That would be interesting. |
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