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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Turning common pipe
How can I turn 1.5" pipe and get a decent finish. Need to make a
sleeve for a golf cart clutch and 1.5" pipe is close to the finished size. I'd rather not have to bore a 1.62 hole in solid stock if I can find another way |
#2
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Turning common pipe
"Gerry" wrote in message ... How can I turn 1.5" pipe and get a decent finish. Need to make a sleeve for a golf cart clutch and 1.5" pipe is close to the finished size. I'd rather not have to bore a 1.62 hole in solid stock if I can find another way I had a job a while back using 1/2" pipe to make bushings. Don't remember having any trouble at all. I'm sure I used HSS hand ground tool bits. I know I turned 2" pipe to make idler rollers on my water bin dump in 1988. It came out well, used the rollers a whole bunch today. Again don't remember but surely used HSS hand ground tool bits. The rollers are still real smooth except where the bin skids ride. The metal is actually wearing thin here. I may have to re-do it in another ten years or so. Karl |
#3
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Turning common pipe
On Oct 31, 4:20*pm, Gerry wrote:
How can I turn 1.5" pipe and get a decent finish. Need to make a sleeve for a golf cart clutch and 1.5" pipe is close to the finished size. I'd rather not have to bore a 1.62 hole in solid stock if I can find another way If it's common black iron pipe, it may be interesting if you need smooth finish inside and out. There's usually a nasty seam inside from the lap welding process, makes boring/reaming very interesting. Die grinder time. I wanted to make an extended column for my cheapie bench drill press. I ended up with some pipe about .080" over what I needed. I found out the stuff was square-ish. So don't assume what you get will be round or even close to round. I ended up using a belt grinder to round it up and work it down, ended up with a nice ground finish over 3' or so(and a whole pile of steel dust). Variation was about .005" over the length, close enough for the table clamp to work well from top to bottom. D.O.M. tubing has a much better interior finish, but may not be available in the wall thickness you want. If what you need is fairly short, like less than 3/8" or so, you could rough your bushing blank out of solid with a hole saw or saws, then finish inside and out in the lathe. Lots of cutting oil needed and a rigid drill press. Alternative for longer blanks, chain-drill inside and out, then knock the slug out and the corners off. Then finish in the lathe. Tedious, but I've done it. Stan |
#4
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Turning common pipe
On Oct 31, 5:20*pm, Gerry wrote:
How can I turn 1.5" pipe and get a decent finish. Need to make a sleeve for a golf cart clutch and 1.5" pipe is close to the finished size. I'd rather not have to bore a 1.62 hole in solid stock if I can find another way The job is to make a bushing for a golf cart clutch. ID has to be 1.62 and OD 1.80 or so. 1.5" pipe is fairly close but it just turns pretty bad because the steel tears out leaving a poor surface. Made a hi speed tool with about 1/8" radius and turned at 190 rpm and I get a decent but not good surface. Carbide was much worse than HSS. Still have to bore it to fit the shaft it rides on. I will look for some 1.5" conduit at work as it should already have a reamed ID. 12L14 would be easy to use but I just hate to start with a 2" chunk and have to bore it out to 1.62. Bushing has to be just under 2" long. Thanks for any ideas |
#5
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Turning common pipe
The job is to make a bushing for a golf cart clutch. ID has to be 1.62 and OD 1.80 or so. 1.5" pipe is fairly close but it just turns pretty bad because the steel tears out leaving a poor surface. Made a hi speed tool with about 1/8" radius and turned at 190 rpm and I get a decent but not good surface. Carbide was much worse than HSS. Still I'd try a HSS bit with just an RCH of radius. Stone it razor sharp. Use coolant and turn the RPM WAY up. Should stop the tearing. Karl |
#6
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Turning common pipe
On Nov 1, 12:32*am, Gerry wrote:
The job is to make a bushing for a golf cart clutch. ID has to be 1.62 and OD 1.80 or so. 1.5" pipe is fairly close but it just turns pretty bad because the steel tears out leaving a poor surface. Made a hi speed tool with *about 1/8" radius and turned at 190 rpm and I get a decent but not good surface. Thanks for any ideas Cheat. Turn it a little oversize and then use a file on it while it is still in the lathe and turning. Should give you a good surface finish. Sandpaper will also work. Dan |
#7
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Turning common pipe
On Sat, 31 Oct 2009 15:20:03 -0700 (PDT), Gerry
wrote: How can I turn 1.5" pipe and get a decent finish. Need to make a sleeve for a golf cart clutch and 1.5" pipe is close to the finished size. I'd rather not have to bore a 1.62 hole in solid stock if I can find another way On a lathe or centerless grinder? Depends on your definition of ... decent finish. Would that be a 16 finish..or 56? Gunner "IMHO, some people here give Jeff far more attention than he deserves, but obviously craves. The most appropriate response, and perhaps the cruelest, IMO, is to simply killfile and ignore him. An alternative, if you must, would be to post the same standard reply to his every post, listing the manifold reasons why he ought to be ignored. Just my $0.02 worth." |
#8
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Turning common pipe
On Oct 31, 5:20*pm, Gerry wrote:
How can I turn 1.5" pipe and get a decent finish. Need to make a sleeve for a golf cart clutch and 1.5" pipe is close to the finished size. I'd rather not have to bore a 1.62 hole in solid stock if I can find another way I've seen a considerable difference between batches and Lowe's vs Home Depot, not that either is consistently better. Sometimes it is pushed in along the weld seam or otherwise out of round. Pocket-sized 4" dial calipers can find that easily. Heating it red and quenching when the red disappears may improve how well it turns. I use sharp HSS with little top rake and brushed-on pipe threading oil. The well-braced shear cut you get by setting the slanted end of the bit square against the work and raised so the cut is in the middle helps sometimes. jsw |
#9
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Turning common pipe
Jim Wilkins wrote:
.... Heating it red and quenching when the red disappears may improve how well it turns. ... Does that mean "Heating it red, letting it air cool until the red disappears, and then quenching"? And, what does this do to the steel? Always on the lookout to learn something new, Bob |
#10
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Turning common pipe
On Nov 1, 9:14*am, Bob Engelhardt wrote:
Jim Wilkins wrote: ... Heating it red and quenching when the red disappears may improve how well it turns. ... Does that mean "Heating it red, letting it air cool until the red disappears, and then quenching"? And, what does this do to the steel? Always on the lookout to learn something new, Bob It's called a Water Anneal. Exactly what it does depends on the steel composition and your idea of 'red hot'. I've seen it in several Lindsay books as an alternative to annealing or normalizing, along with hearsay evidence that it leaves the steel in the best or preferred condition for machining with HSS tools. There was no mention of checking for the Curie point with a magnet. In my own limited experience it makes the steel slightly harder and less gooey than a full anneal with overnight cooling in the wood stove, though that works well too and is easier with larger pieces. http://www.knives.com/heatreat.html jsw |
#11
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Turning common pipe
"Jim Wilkins" wrote in message ... On Nov 1, 9:14 am, Bob Engelhardt wrote: Jim Wilkins wrote: ... Heating it red and quenching when the red disappears may improve how well it turns. ... Does that mean "Heating it red, letting it air cool until the red disappears, and then quenching"? And, what does this do to the steel? Always on the lookout to learn something new, Bob It's called a Water Anneal. Exactly what it does depends on the steel composition and your idea of 'red hot'. I've seen it in several Lindsay books as an alternative to annealing or normalizing, along with hearsay evidence that it leaves the steel in the best or preferred condition for machining with HSS tools. There was no mention of checking for the Curie point with a magnet. In my own limited experience it makes the steel slightly harder and less gooey than a full anneal with overnight cooling in the wood stove, though that works well too and is easier with larger pieces. http://www.knives.com/heatreat.html jsw It sounds similar to normalizing, which also improves machinability. You keep the heating brief to avoid grain growth, and it retains some hardness. That is, normalizing does. The difference is that you're talking about a fast quench, whereas normalizing is quenched in air (without insulation, as for a full anneal). I can't speak for what it does to a low-carbon steel, like water or gas pipe, but it's very effective when the steel has a high carbon content. FWIW, I've never had success getting clean cuts on water pipe, either. But I didn't experiment much with it. I just finished with a file. g -- Ed Huntress |
#12
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Turning common pipe
On Sun, 01 Nov 2009 09:14:09 -0500, Bob Engelhardt
wrote: Jim Wilkins wrote: ... Heating it red and quenching when the red disappears may improve how well it turns. ... Does that mean "Heating it red, letting it air cool until the red disappears, and then quenching"? And, what does this do to the steel? Always on the lookout to learn something new, Bob Its called Annealing "IMHO, some people here give Jeff far more attention than he deserves, but obviously craves. The most appropriate response, and perhaps the cruelest, IMO, is to simply killfile and ignore him. An alternative, if you must, would be to post the same standard reply to his every post, listing the manifold reasons why he ought to be ignored. Just my $0.02 worth." |
#13
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Turning common pipe
Gunner Asch wrote:
On Sun, 01 Nov 2009 09:14:09 -0500, Bob Engelhardt wrote: Jim Wilkins wrote: ... Heating it red and quenching when the red disappears may improve how well it turns. ... Does that mean "Heating it red, letting it air cool until the red disappears, and then quenching"? And, what does this do to the steel? Its called Annealing I thought annealing (1) applied to high(er) carbon steel (not mild steel), (2) required a very slow cool down (insulated). Bob |
#14
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Turning common pipe
"Bob Engelhardt" wrote in message ... Gunner Asch wrote: On Sun, 01 Nov 2009 09:14:09 -0500, Bob Engelhardt wrote: Jim Wilkins wrote: ... Heating it red and quenching when the red disappears may improve how well it turns. ... Does that mean "Heating it red, letting it air cool until the red disappears, and then quenching"? And, what does this do to the steel? Its called Annealing I thought annealing (1) applied to high(er) carbon steel (not mild steel), (2) required a very slow cool down (insulated). Bob It applies to any steel, or most other metals, for that matter. In addition to slow cooling, it requires a soak at a temperature over the Curie temp. Annealed steel is dead-soft. The problems are that it's a bit gummy, and it can have large grain sizes, which leads to weakness and rough finishes. -- Ed Huntress |
#15
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Turning common pipe
On Sun, 01 Nov 2009 19:04:11 -0500, Bob Engelhardt
wrote: Gunner Asch wrote: On Sun, 01 Nov 2009 09:14:09 -0500, Bob Engelhardt wrote: Jim Wilkins wrote: ... Heating it red and quenching when the red disappears may improve how well it turns. ... Does that mean "Heating it red, letting it air cool until the red disappears, and then quenching"? And, what does this do to the steel? Its called Annealing I thought annealing (1) applied to high(er) carbon steel (not mild steel), (2) required a very slow cool down (insulated). Bob Not necessarily. It has varying degrees "IMHO, some people here give Jeff far more attention than he deserves, but obviously craves. The most appropriate response, and perhaps the cruelest, IMO, is to simply killfile and ignore him. An alternative, if you must, would be to post the same standard reply to his every post, listing the manifold reasons why he ought to be ignored. Just my $0.02 worth." |
#16
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Turning common pipe
On Sat, 31 Oct 2009 17:32:40 -0700 (PDT), Gerry wrote:
On Oct 31, 5:20*pm, Gerry wrote: How can I turn 1.5" pipe and get a decent finish. Need to make a sleeve for a golf cart clutch and 1.5" pipe is close to the finished size. I'd rather not have to bore a 1.62 hole in solid stock if I can find another way The job is to make a bushing for a golf cart clutch. ID has to be 1.62 and OD 1.80 or so. 1.5" pipe is fairly close but it just turns pretty bad because the steel tears out leaving a poor surface. Personally, for these dimensions. I wouldn't bother messing around with iron pipe. I'd turn it from solid. Drilling to 1" and then boring the rest of the way. Advantage of that is that it would then be made of 4340pre-hard, which I have a stock of, and which machines beautifully, rather than unknownium. Whenever you come across a project that needs a foot of stock, buy a length of stock, eventually, you have what you need waiting for you :-) Sorry, bad day at work :-( Mark Rand RTFM |
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