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Best way to drill through cast iron???
I'm stumped on a good way to add an outfeed table to my saw. Yet another
"benefit" of the Jet Supersaw. Before I dimisss this idea entirely, I thought I'd ask the "Pro's". If I wanted to attach some brackets to the table saw cast iron top, I think I'd be drilling some biggun holes into some purdy thick iron. Would I be an idiot to try this? Would it take forever? Would I go through 35 bits? Would I need some liquid coolant on the bore? Should I buy eight $15 Black and Decker cheapo drills and just burn them up? Or - should I dimiss this approach and look for another way to attach the outfeed table? |
#2
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Best way to drill through cast iron???
it isn't that tuff to drill. You are gonna drill about 1/2 or 7/16 holes? One
bit should do the whole thing. We aren't talking grade 8 material here. Now that takes a cobalt drill bit, or better. dave tnfkajs wrote: I'm stumped on a good way to add an outfeed table to my saw. Yet another "benefit" of the Jet Supersaw. Before I dimisss this idea entirely, I thought I'd ask the "Pro's". If I wanted to attach some brackets to the table saw cast iron top, I think I'd be drilling some biggun holes into some purdy thick iron. Would I be an idiot to try this? Would it take forever? Would I go through 35 bits? Would I need some liquid coolant on the bore? Should I buy eight $15 Black and Decker cheapo drills and just burn them up? Or - should I dimiss this approach and look for another way to attach the outfeed table? |
#3
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Best way to drill through cast iron???
-- In His Name, be Blessed, Just drill with steady pressure and low speeds and I use power steering fluid as a lubercant.. Just watch the chip coming from the hole you are drilling because it will tell you the correct speed and feed. God Bless, Mike www.cedarworks.1plan.net www.geocities.com/zuchick "tnfkajs" wrote in message ... I'm stumped on a good way to add an outfeed table to my saw. Yet another "benefit" of the Jet Supersaw. Before I dimisss this idea entirely, I thought I'd ask the "Pro's". If I wanted to attach some brackets to the table saw cast iron top, I think I'd be drilling some biggun holes into some purdy thick iron. Would I be an idiot to try this? Would it take forever? Would I go through 35 bits? Would I need some liquid coolant on the bore? Should I buy eight $15 Black and Decker cheapo drills and just burn them up? Or - should I dimiss this approach and look for another way to attach the outfeed table? |
#4
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Best way to drill through cast iron???
tnfkajs wrote:
I'm stumped on a good way to add an outfeed table to my saw. Yet another "benefit" of the Jet Supersaw. Before I dimisss this idea entirely, I thought I'd ask the "Pro's". If I wanted to attach some brackets to the table saw cast iron top, I think I'd be drilling some biggun holes into some purdy thick iron. Would I be an idiot to try this? Would it take forever? Would I go through 35 bits? Would I need some liquid coolant on the bore? Should I buy eight $15 Black and Decker cheapo drills and just burn them up? Or - should I dimiss this approach and look for another way to attach the outfeed table? I use rare earth magnets epoxy'd to the table that attach them selves and hold pretty well. You can find these in any old hard drive or do a web search for rare earth magnets. Someone a long while back (it's been 8 months since I've been on the wreck) posted this message and had a web site showing it. Works great! Mike |
#5
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Best way to drill through cast iron???
"tnfkajs" wrote in message ... I'm stumped on a good way to add an outfeed table to my saw. Yet another "benefit" of the Jet Supersaw. Before I dimisss this idea entirely, I thought I'd ask the "Pro's". If I wanted to attach some brackets to the table saw cast iron top, I think I'd be drilling some biggun holes into some purdy thick iron. Would I be an idiot to try this? Would it take forever? Would I go through 35 bits? Would I need some liquid coolant on the bore? Should I buy eight $15 Black and Decker cheapo drills and just burn them up? Or - should I dimiss this approach and look for another way to attach the outfeed table? Off memory (from when i drilled holes in my bandsaw table for an aftermarket fence), just use a standard high speed steel twist bit at about 1000rpm (I used a drill press). A little lube may help disipate the heat produced and protect the drill bit a little more but apply it only after you have drilled in a small way, so it doesn't slip while your trying to drill the first few mm's -- Regards, Dean Bielanowski Editor, Online Tool Reviews http://www.onlinetoolreviews.com ------------------------------------------------------------ Latest 5 Reviews: - Ryobi CDL1802D Pro Series 18v Cordless Drill - Eze-Lap Diamond Sharpening Stones - Incra TS-III Table Saw Fence - Ryobi AP13 Planer/Thicknesser - BeadLOCK Loose Tenon Joinery System ------------------------------------------------------------ |
#6
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Best way to drill through cast iron???
On Mon, 4 Aug 2003 16:06:44 -0600, "tnfkajs"
wrote: If I wanted to attach some brackets to the table saw cast iron top, I think I'd be drilling some biggun holes into some purdy thick iron. Would I be an idiot to try this? Would it take forever? No idea. Well behaved cast iron is easy to drill, "chilled" iron can be a nightmare. Give it a go, you'll probably find it drills very easily. Use a sharp twist drill and you don't need lubricants or cutting fluid. The swarf should come off as chips, not twirlies. |
#7
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Best way to drill through cast iron???
I'd use oil, slow speed, and not over 1/4".
Drill a hole in some iron, or maybe use one of your rails, and clamp it so the hole is where you want to drill. That will get you started and keep the bit from skating. Wilson "tnfkajs" wrote in message ... I'm stumped on a good way to add an outfeed table to my saw. Yet another "benefit" of the Jet Supersaw. Before I dimisss this idea entirely, I thought I'd ask the "Pro's". If I wanted to attach some brackets to the table saw cast iron top, I think I'd be drilling some biggun holes into some purdy thick iron. Would I be an idiot to try this? Would it take forever? Would I go through 35 bits? Would I need some liquid coolant on the bore? Should I buy eight $15 Black and Decker cheapo drills and just burn them up? Or - should I dimiss this approach and look for another way to attach the outfeed table? |
#8
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Best way to drill through cast iron???
"tnfkajs" wrote:
I'm stumped on a good way to add an outfeed table to my saw. Yet another "benefit" of the Jet Supersaw. Before I dimisss this idea entirely, I thought I'd ask the "Pro's". [snip] Cast drills ez. Drill a pilot hole to make it easier though. Lubricants not needed. Wes -- Reply to: Whiskey Echo Sierra Sierra AT Gee Tee EYE EYE dot COM Lycos address is a spam trap. |
#9
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Best way to drill through cast iron???
On Mon, 4 Aug 2003 16:06:44 -0600, "tnfkajs"
wrote: I'm stumped on a good way to add an outfeed table to my saw. Yet another "benefit" of the Jet Supersaw. Before I dimisss this idea entirely, I thought I'd ask the "Pro's". If I wanted to attach some brackets to the table saw cast iron top, I think I'd be drilling some biggun holes into some purdy thick iron. why use big holes? just drill and tap some holes. then you dont have to worrie with nuts and washers. makes the addition of a table easy.bolt your brackets directly to the top. i used an old detla saw table to mount several grinders to in this manner. worked like a charm. go slow and let the bit do the work.the cast drills easy and 1 bit and 1 tap should do all the holes for you. george Would I be an idiot to try this? Would it take forever? Would I go through 35 bits? Would I need some liquid coolant on the bore? Should I buy eight $15 Black and Decker cheapo drills and just burn them up? Or - should I dimiss this approach and look for another way to attach the outfeed table? |
#10
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Best way to drill through cast iron???
tnfkajs wrote:
I'd be drilling some biggun holes into some purdy thick iron. Would I be an idiot to try this? Would it take forever? Would I go through 35 bits? Would I need some liquid coolant on the bore? Should I buy eight $15 Black and Decker cheapo drills and just burn them up? What do you consider a big hole? FWIW I drilled a 1/2" hole through a piece of railroad track (just under the rail head, where it was maybe 1" thick). I used 3-in-one oil to lubricate it, because that's what was within reach. I set the speed on my drill press according to the chart, and wound up using the lowest speed I had for the job, but it came out fine. I got two perfect little twisty thingies (dang, what are those called?), and the bit is fine. The only problem was when the bit started to break through to the other side, grabbed, and tried to spin the 60-pound piece of track. I smoked the belts on the drill press a couple of times before I managed to find just the right light touch to get through without it grabbing. Cast iron would be even easier to drill, though you have the dual problems of keeping the drill perpendicular to the table surface and maintaining a good, low speed. Maybe use a dowling jig? -- Michael McIntyre ---- Silvan Linux fanatic, and certified Geek; registered Linux user #243621 Confirmed post number: 16970 Approximate word count: 509100 http://www.geocities.com/Paris/Rue/5407/ |
#11
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Best way to drill through cast iron???
Andy Dingley wrote:
cutting fluid. The swarf should come off as chips, not twirlies. Swarf. That's it. So after I just bragged about my perfect little twisty things, does that mean I did it wrong? Fed too fast? -- Michael McIntyre ---- Silvan Linux fanatic, and certified Geek; registered Linux user #243621 Confirmed post number: 16971 Approximate word count: 509130 http://www.geocities.com/Paris/Rue/5407/ |
#12
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Best way to drill through cast iron???
tnfkajs wrote:
I'm stumped on a good way to add an outfeed table to my saw. Yet another "benefit" of the Jet Supersaw. Before I dimisss this idea entirely, I thought I'd ask the "Pro's". If I wanted to attach some brackets to the table saw cast iron top, I think I'd be drilling some biggun holes into some purdy thick iron. Would I be an idiot to try this? Would it take forever? Would I go through 35 bits? Would I need some liquid coolant on the bore? Should I buy eight $15 Black and Decker cheapo drills and just burn them up? Or - should I dimiss this approach and look for another way to attach the outfeed table? Easy to drill, just do it in stages beginning with a 1/8" drill bit then 3/16", etc. until you reach the size you want for your bolts. A little oil won't hurt but you don't need to slop it on this way. Scott -- An unkind remark is like a killing frost. No matter how much it warms up later, the damage remains. |
#13
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Best way to drill through cast iron???
Cast iron is easily drilled with high speed steel drill bits..
tnfkajs wrote: I'm stumped on a good way to add an outfeed table to my saw. Yet another "benefit" of the Jet Supersaw. Before I dimisss this idea entirely, I thought I'd ask the "Pro's". If I wanted to attach some brackets to the table saw cast iron top, I think I'd be drilling some biggun holes into some purdy thick iron. Would I be an idiot to try this? Would it take forever? Would I go through 35 bits? Would I need some liquid coolant on the bore? Should I buy eight $15 Black and Decker cheapo drills and just burn them up? Or - should I dimiss this approach and look for another way to attach the outfeed table? |
#14
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Best way to drill through cast iron???
Cast iron is the easiest stuff in the world to drill. More fun that wood, IMHO.
Centerpunch to locate the hole, drill one small pilot hole, then go full-size. Don't use cutting fluid--it's self-lubricating. A slightly higher speed than steel for the same bit size is good. Can't offer any info specific to the project. GTO(John) I'm stumped on a good way to add an outfeed table to my saw. Yet another "benefit" of the Jet Supersaw. Before I dimisss this idea entirely, I thought I'd ask the "Pro's". If I wanted to attach some brackets to the table saw cast iron top, I think I'd be drilling some biggun holes into some purdy thick iron. Would I be an idiot to try this? Would it take forever? Would I go through 35 bits? Would I need some liquid coolant on the bore? Should I buy eight $15 Black and Decker cheapo drills and just burn them up? Or - should I dimiss this approach and look for another way to attach the outfeed table? |
#15
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Best way to drill through cast iron???
Andy Dingley wrote:
http://www.swarf.org.uk I'm offline at the moment, but I'll follow that directly. So after I just bragged about my perfect little twisty things, does that mean I did it wrong? Fed too fast? That may have been malleable cast iron, rather than grey. Commonly used for the better G clamps, but not cheap machine tool tables. Oh, right, cast iron. I was drilling a piece of railroad track. Whatever kind of steel that is. -- Michael McIntyre ---- Silvan Linux fanatic, and certified Geek; registered Linux user #243621 Confirmed post number: 17006 Approximate word count: 510180 http://www.geocities.com/Paris/Rue/5407/ |
#16
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Best way to drill through cast iron???
On Wed, 06 Aug 2003 20:41:43 -0400, Silvan
wrote: Oh, right, cast iron. I was drilling a piece of railroad track. Whatever kind of steel that is. Steel isn't the same as iron. Not by a long way ! We no longer see much iron in use, just cast iron. And even that's getting rarer. Before the late 19th century and the Bessemer converter though, steel was a rare and expensive alloy used only for hard edges. Most things we'd now use mild steel for were made of wrought iron, of various grades. These days, decorative smiths can hardly buy wrought iron anywhere. There are only three (?) bloomeries left making it world-wide, and these are solely for the "arts and crafts" market. Railway line is awkward stuff. Old rails tended to be fairly simple alloys, but modern ones are quite complex. They may even be a harder steel head welded to a less brittle rail, or a flame carburisation process where the alloy of the wear surface is changed. Some of these are damn near undrillable. Around 1910, Newcastle Upon Tyne was noted for two things; the huge shipyards building armoured battleships, and the world's largest railway crossing at one end of Central station. Crossings and points are always awkward, as the "frog noses" (the pointy bit) wear rapidly. The solution to regular replacement and traffic disruption was to replace the frogs in this crossing by a specialised manganese steel, drawing on the shipyard's armour knowledge. |
#17
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Best way to drill through cast iron???
On Thu, 07 Aug 2003 19:04:01 -0400, Silvan
wrote: Your mention of chips good, twisties bad (in reference to cast iron) I never said "good" or "bad", just that it's how CI behaves. Twisty swarf certainly isn't bad, it's just that you won;t get it, except for the most sophisticated grades of CI. The other thing about CI is that it contains loose carbon between the iron crystal grains. This acts as a lubricant, so you don't need to add one yourself. One way or the other, the hole is drilled, the rod installed, the chain attached, and the railroad track segment serves as the counterweight for my trebuchet. Doesn't really sound heavy enough ! My 8' beam car-portable treb http://www.jarkman.co.uk/toys.htm began life with a 12 brick counterweight and was pathetic. With a 20 brick counterweight it got much more interesting. You need at least 20:1 weight ratio to make a treb start to behave. |
#18
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Best way to drill through cast iron???
Andy Dingley wrote:
One way or the other, the hole is drilled, the rod installed, the chain attached, and the railroad track segment serves as the counterweight for my trebuchet. Doesn't really sound heavy enough ! It isn't, but it's the most weight I could come up with without having to scrap the entire thing. Started life using part of an old weight set for weight. Came to 26 pounds. It was miserable. The track weighs 62 pounds, so it does better. Track works because it's narrow enough to fit into the frame that I built to accommodate the original weights. Any wider, and I have to replace my nice hardened steel Nordic Trac axle with something else, and pretty much rebuild the entire thing from there. My 8' beam car-portable treb http://www.jarkman.co.uk/toys.htm began life with a 12 brick counterweight and was pathetic. With a 20 brick counterweight it got much more interesting. You need at least 20:1 weight ratio to make a treb start to behave. I shoot a 5 oz baseball, so that's... Well, more math than I want to do after all this beer. Let's see... 16 ounces to a pound, so I have 5/16 of a pound... Looks like almost a 200:1 ratio unless I'm just demonstrating how bad Americans are at math. No pictures. I haven't gotten around to taking any yet. It's a good bit smaller than yours, and much more heavily built. Maybe I over-built it, but it sure has lasted well. I have it strapped to a hand truck so I can roll it across to the big parking lot across the street. If I ever get to take it anywhere, I can probably fit it into the back of a van without taking it apart, though I will want to un-hook the weight first I should think. Maximum range on those baseballs is about 100' I'm afraid. I've heard accounts of smaller/lighter trebs doing better, so maybe I don't have mine properly tuned yet. Tomorrow I'll throw half a brick with the thing and see if I can beat your 50' throw. -- Michael McIntyre ---- Silvan Linux fanatic, and certified Geek; registered Linux user #243621 Confirmed post number: 17080 Approximate word count: 512400 http://www.geocities.com/Paris/Rue/5407/ |
#19
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Best way to drill through cast iron???
JackD wrote:
If you are hauling it in a car, why not bolt a big hook on the front of the car and use it as the counterweight? Be damn hard to crank it up though, I'd think. Hard on the suspension too. -- Michael McIntyre ---- Silvan Linux fanatic, and certified Geek; registered Linux user #243621 Confirmed post number: 17081 Approximate word count: 512430 http://www.geocities.com/Paris/Rue/5407/ |
#20
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Best way to drill through cast iron???
On Sat, 09 Aug 2003 02:27:05 -0400, Silvan
wrote: I shoot a 5 oz baseball, so that's... Well, more math than I want to do after all this beer. Let's see... 16 ounces to a pound, so I have 5/16 of a pound... Looks like almost a 200:1 ratio unless I'm just demonstrating how bad Americans are at math. You need to account for the beam inertia too. Tomorrow I'll throw half a brick with the thing and see if I can beat your 50' throw. Nearer 200' now - with the big counterweight ! |
#21
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Best way to drill through cast iron???
Andy Dingley wrote:
a pound... Looks like almost a 200:1 ratio unless I'm just demonstrating how bad Americans are at math. You need to account for the beam inertia too. I have no idea how to calculate that, so we'll just skip it. It's more than plenty enough to throw a baseball. I hate sewing, and I made a sling that can't fit anything larger than a baseball, so a baseball it is. I wonder how you'd factor in the roller bearings when calculating arm inertia. I gather these things aren't usually built that way. The arm is ~2" wide along the pivot axis, but the contact patch is much narrower, since the only bearing surfaces are a couple of 1/4" thick roller bearings. Very low resistance; very smooooth. If I put a fixed weight on the bottom and give it a good shove, it will rock back and forth for 20 minutes. Tomorrow I'll throw half a brick with the thing and see if I can beat your 50' throw. Nearer 200' now - with the big counterweight ! I got to about 70' with half a brick. But your machine is much larger than mine. From ground to the top of the hook is 60". Anyway, there are lots of trebuchets out there in the world that are bigger/stronger/faster/cooler than mine, but there's only one like this one, and I designed and built the thing myself, and it kicks ass, no matter what anybody else says. -- Michael McIntyre ---- Silvan Linux fanatic, and certified Geek; registered Linux user #243621 Confirmed post number: 17108 Approximate word count: 513240 http://www.geocities.com/Paris/Rue/5407/ |
#22
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Best way to drill through cast iron???
On Sat, 09 Aug 2003 15:10:03 -0400, Silvan
wrote: You need to account for the beam inertia too. I have no idea how to calculate that, so we'll just skip it. Download the programs WinTreb or TrebStar I wonder how you'd factor in the roller bearings when calculating arm inertia. I gather these things aren't usually built that way. My one started with an axle of 3/4" tube, then bent that during testing. Nw it runs with solid 3/4" steel. Don't underestimate the forces around that pivot ! (like they did on Scrapheap Challenge) there's only one like this one, and I designed and built the thing myself, and it kicks ass, no matter what anybody else says. Absolutely ! BTW, the last couple I made were mangonels, not trebs (twisted rope, not a weight) One had a 9" arm, for my 8 year old, and the other had a 12" arm for a friend's birthday. http://www.jarkman.co.uk/catalog/random/onager.htm |
#23
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Best way to drill through cast iron???
Silvan wrote:
Andy Dingley wrote: a pound... Looks like almost a 200:1 ratio unless I'm just demonstrating how bad Americans are at math. You need to account for the beam inertia too. I have no idea how to calculate that, so we'll just skip it. It's more than plenty enough to throw a baseball. I hate sewing, and I made a sling that can't fit anything larger than a baseball, so a baseball it is. I wonder how you'd factor in the roller bearings when calculating arm inertia. I gather these things aren't usually built that way. The arm is ~2" wide along the pivot axis, but the contact patch is much narrower, since the only bearing surfaces are a couple of 1/4" thick roller bearings. Very low resistance; very smooooth. If I put a fixed weight on the bottom and give it a good shove, it will rock back and forth for 20 minutes. Tomorrow I'll throw half a brick with the thing and see if I can beat your 50' throw. Nearer 200' now - with the big counterweight ! I got to about 70' with half a brick. But your machine is much larger than mine. From ground to the top of the hook is 60". Anyway, there are lots of trebuchets out there in the world that are bigger/stronger/faster/cooler than mine, but there's only one like this one, and I designed and built the thing myself, and it kicks ass, no matter what anybody else says. Constrain the payload to approximate size and mass of a USDA grade A extra large hen's egg: good aerodynamics, harmless, but still lots of fun. What range could you achieve with a modest treb? |
#24
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Best way to drill through cast iron???
Andy Dingley wrote:
I have no idea how to calculate that, so we'll just skip it. Download the programs WinTreb or TrebStar And run them on what? I haven't found any trebuchet software for Linux. Actually, I just looked again, and there _is_ something, but SourceForge is being uncooperative at the moment. My one started with an axle of 3/4" tube, then bent that during testing. Nw it runs with solid 3/4" steel. Don't underestimate the forces around that pivot ! (like they did on Scrapheap Challenge) Mine is only 5/8" but it's serious stuff. I couldn't drill a hole in it. When I tried to mark the starter dimple with my center punch, I ruined my center punch. I never could get a bit into it. BTW, the last couple I made were mangonels, not trebs (twisted rope, not a weight) One had a 9" arm, for my 8 year old, and the other had a 12" arm for a friend's birthday. http://www.jarkman.co.uk/catalog/random/onager.htm I've thought about building one of those myself, but I think I have to draw the line somewhere, and that's it. Using archaic technology is fun, but for the scale of machine I have to build, I'd be surprised if a torsion bundle is worth the effort compared to bungee power. -- Michael McIntyre ---- Silvan Linux fanatic, and certified Geek; registered Linux user #243621 Confirmed post number: 17115 Approximate word count: 513450 http://www.geocities.com/Paris/Rue/5407/ |
#25
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Best way to drill through cast iron???
Dr. Rev. Chuck, M.D. P.A. wrote:
Constrain the payload to approximate size and mass of a USDA grade A extra large hen's egg: good aerodynamics, harmless, but still lots of fun. What range could you achieve with a modest treb? Hmmm... Now why didn't I think of that? We don't eat a lot of eggs, and I'll bet there are still eggs in the fridge left over from last winter's cookie baking season. Maybe I'll decorate the gigantic concrete wall beside my house. -- Michael McIntyre ---- Silvan Linux fanatic, and certified Geek; registered Linux user #243621 Confirmed post number: 17116 Approximate word count: 513480 http://www.geocities.com/Paris/Rue/5407/ |
#26
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Best way to drill through cast iron???
Hmmm. Flashback from working on heavy equipment!
I used to hate drilling holes in thick cast iron - a realitively thin table saw should be a cakewalk. We used a 2 HP drill - if the bit bit - you went for a ride! My Delta TS has 3 holes drilled on each side for this purpose. You will need Cobalt Drill Bits. The bigger the drill the better. Start out with a small bit and work your way up to whatever size you need. I assume you'll wind up using 3/8" bolts (?). Optionally you can tap the holes to receive the bolt. Mark from Pasadena, MD tnfkajs wrote: I'm stumped on a good way to add an outfeed table to my saw. Yet another "benefit" of the Jet Supersaw. Before I dimisss this idea entirely, I thought I'd ask the "Pro's". If I wanted to attach some brackets to the table saw cast iron top, I think I'd be drilling some biggun holes into some purdy thick iron. Would I be an idiot to try this? Would it take forever? Would I go through 35 bits? Would I need some liquid coolant on the bore? Should I buy eight $15 Black and Decker cheapo drills and just burn them up? Or - should I dimiss this approach and look for another way to attach the outfeed table? |
#27
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Best way to drill through cast iron???
I too have the Jet SuperSaw and I have added an outfeed table to the
back (32"x57" I think), an extention table to the right hand side, a drawer under the extension table (for push sticks and feater boards) and a large drawer under the saw cabnet for blades and such. Drilling through the cast iron was easy (1/4" holes). I used a BD elec drill, 1/4" 'Bad Dog' bit and a little 3-in-1 oil. Worked like a champ. If you want more info or some pictures, email me. Cheers, john tnfkajs wrote: I'm stumped on a good way to add an outfeed table to my saw. Yet another "benefit" of the Jet Supersaw. Before I dimisss this idea entirely, I thought I'd ask the "Pro's". If I wanted to attach some brackets to the table saw cast iron top, I think I'd be drilling some biggun holes into some purdy thick iron. Would I be an idiot to try this? Would it take forever? Would I go through 35 bits? Would I need some liquid coolant on the bore? Should I buy eight $15 Black and Decker cheapo drills and just burn them up? Or - should I dimiss this approach and look for another way to attach the outfeed table? |
#28
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Best way to drill through cast iron???
Standard HSS is fine. Cast iron is easy drilling. If you do drill a pilot
hole (recommended) make sure it is smaller than the web diameter of the larger drill bit or it Will grab. The average 1/2 inch corded drill is plenty. "Mark" wrote in message ... You will need Cobalt Drill Bits. The bigger the drill the better. Start out with a small bit and work your way up to whatever size you need. I assume you'll wind up using 3/8" bolts (?). Optionally you can tap the holes to receive the bolt. Mark from Pasadena, MD |
#29
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Best way to drill through cast iron???
On Sun, 10 Aug 2003 01:16:25 -0400, Silvan
wrote: Download the programs WinTreb or TrebStar And run them on what? Wine ? Using archaic technology is fun, but for the scale of machine I have to build, I'd be surprised if a torsion bundle is worth the effort compared to bungee power. A torsion bundle works better when scaled down than either a weight machine (especially) or a bungee. Nylon bricklayer's line is the best I've found. Horsehair is more in period. |
#30
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Best way to drill through cast iron???
Take the piece off and take to a GOOD machine shop.
tnfkajs wrote: I'm stumped on a good way to add an outfeed table to my saw. Yet another "benefit" of the Jet Supersaw. Before I dimisss this idea entirely, I thought I'd ask the "Pro's". If I wanted to attach some brackets to the table saw cast iron top, I think I'd be drilling some biggun holes into some purdy thick iron. Would I be an idiot to try this? Would it take forever? Would I go through 35 bits? Would I need some liquid coolant on the bore? Should I buy eight $15 Black and Decker cheapo drills and just burn them up? Or - should I dimiss this approach and look for another way to attach the outfeed table? |
#31
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Best way to drill through cast iron???
tnfkajs wrote: If I wanted to attach some brackets to the table saw cast iron top, I think I'd be drilling some biggun holes into some purdy thick iron. Would I be an idiot to try this? Would it take forever? If there is a flat surface, you can atach a magnetic drill. Good tool rental shops have them, but it will probably be $50 for the day. You supply the bit. Yes, lube as you drill, even if it is only a spray of WD-40. Or - should I dimiss this approach and look for another way to attach the outfeed table? Anything you can clamp on to? Ed |
#32
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Best way to drill through cast iron???
Drill cast iron dry. Hand drill would work just fine.
"Edwin Pawlowski" wrote in message m... tnfkajs wrote: If I wanted to attach some brackets to the table saw cast iron top, I think I'd be drilling some biggun holes into some purdy thick iron. Would I be an idiot to try this? Would it take forever? If there is a flat surface, you can atach a magnetic drill. Good tool rental shops have them, but it will probably be $50 for the day. You supply the bit. Yes, lube as you drill, even if it is only a spray of WD-40. Or - should I dimiss this approach and look for another way to attach the outfeed table? Anything you can clamp on to? Ed |
#33
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Best way to drill through cast iron???
Finally, someone speaking reason. Yes, it drills easily and very nicely.
Tends to clog taps though. Just back out a bit after every couple turns and it works fine. "Morgans" wrote in message ... ""Bo" Mathews" wrote in message ... Take the piece off and take to a GOOD machine shop. tnfkajs wrote: I'm stumped on a good way to add an outfeed table to my saw. Yet another "benefit" of the Jet Supersaw. Before I dimisss this idea entirely, I thought I'd ask the "Pro's". If I wanted to attach some brackets to the table saw cast iron top, I think I'd be drilling some biggun holes into some purdy thick iron. Would I be an idiot to try this? Would it take forever? Would I go through 35 bits? Would I need some liquid coolant on the bore? Should I buy eight $15 Black and Decker cheapo drills and just burn them up? Or - should I dimiss this approach and look for another way to attach the outfeed table? I don't have the slightest idea why the above poster said this. Cast iron is by far the easiest drilling of all the ferric metals. It has properties that make it self lubricating. Follow good procedures, center punch to start, drill in increasing steps of size, slower for bigger drills. -- Jim in NC |
#34
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Best way to drill through cast iron???
On Sun, 07 Sep 2003 07:50:24 GMT, "CW"
wrote: Finally, someone speaking reason. Yes, it drills easily and very nicely. Tends to clog taps though. Just back out a bit after every couple turns and it works fine. How do you get a couple of turns? I've never been able to get more than a half turn or so before things tighten up enough that I'm afraid of breaking the tap. There must be some sort of corrolary to Murphy's Law about this; taps only break in locations whose position is absolutely essential and for which no alternative exists. I don't want to fall prey to that...ever. LRod Master Woodbutcher and seasoned termite Shamelessly whoring my website since 1999 http://www.woodbutcher.net |
#35
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Best way to drill through cast iron???
Depends on the circumstances. You're doing it right though. If you feel
excess resistance, clear the chips. "LRod" wrote in message .. . On Sun, 07 Sep 2003 07:50:24 GMT, "CW" wrote: Finally, someone speaking reason. Yes, it drills easily and very nicely. Tends to clog taps though. Just back out a bit after every couple turns and it works fine. How do you get a couple of turns? I've never been able to get more than a half turn or so before things tighten up enough that I'm afraid of breaking the tap. There must be some sort of corrolary to Murphy's Law about this; taps only break in locations whose position is absolutely essential and for which no alternative exists. I don't want to fall prey to that...ever. LRod Master Woodbutcher and seasoned termite Shamelessly whoring my website since 1999 http://www.woodbutcher.net |
#36
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Best way to drill through cast iron???
"Morgans" wrote in message ... I don't have the slightest idea why the above poster said this. Cast iron is by far the easiest drilling of all the ferric metals. It has properties that make it self lubricating. I'm the OP - I asked this about a month or two ago... I asked because I didn't have the slighest idea on what it took to drill into cast iron. Now I do... |
#37
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Best way to drill through cast iron???
On Sun, 7 Sep 2003 10:41:06 -0700, D.B. wrote:
Back up as it starts to get tight, don't wait until it's tight. I do that. It just doesn't take very long; certainly not two turns. Are you using the right size tap drill for the material? Yes. Don't have good tap drill chart? I do. Subtract one thread pitch from the nominal screw diameter. .250-20 Tap drill = .250 -1/20 = .200. Then pick the next largest actual drill size (assuming you have a complete set of drills). If I can remember all that, I'll try to use it if my chart isn't handy. If you only have a set graduated in 1/16th or 32nds you have a problem. I have fractional and numbered, but I don't have letter size. Most of the time I'm tapping sizes that need number sized bits. No problem there. Also use coarse threads everyplace you can. They are easier to cut and hold up better in many materials, cast iron and aluminum being two good examples. Probably stainless, too, I would think, because of the ease of galling. Thanks for your thoughts. LRod Master Woodbutcher and seasoned termite Shamelessly whoring my website since 1999 http://www.woodbutcher.net |
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