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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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HSS lathe cutoff/parting tool question
Why don't people always use the thinnest parting tool blades made?
On my little lathe I have found that I simply can not use 1/8" HSS blades but the 1/16" ones work OK. I'm getting ready to tool up my 16" lathe and I'm wondering .. Grant Erwin Kirkland, Washington |
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HSS lathe cutoff/parting tool question
On Sun, 07 Sep 2003 09:42:39 -0700, Grant Erwin
wrote: Why don't people always use the thinnest parting tool blades made? On my little lathe I have found that I simply can not use 1/8" HSS blades but the 1/16" ones work OK. I'm getting ready to tool up my 16" lathe and I'm wondering .. Grant Erwin Kirkland, Washington I use both, and even some bigger ones, depending on the material, the rigidity of the lathe and the power it can develop. You saw my big Clausing. I can run a 3/16 parting tool with it, no problems. I sometimes use a big parting tool as its easier for me to grind in features such as chip breakers, tit cutters and other forms, in a bigger tool. The Hardinge you saw, usually gets a 1/8" or smaller tool, as it tends to slip the belts if I try to get burly with it, making customized cutoff features more problematic. Plus, I have been known to break 1/16" cutoff tools fairly regularly when trying to push a cut in stainless steel, even with flood coolant. Shrug. YMMV Gunner "At the core of liberalism is the spoiled child - miserable, as all spoiled children are, unsatisfied, demanding, ill-disciplined, despotic and useless. Liberalism is a philosphy of sniveling brats." -- P.J. O'Rourke |
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HSS lathe cutoff/parting tool question
Grant,
Large cutoff tools work better than thin ones, but they waste more material and require a stiff, heavy machine. All light lathes have difficulty with that operation. Your 16" should have no trouble with the larger blade. Steve "Grant Erwin" wrote in message ... Why don't people always use the thinnest parting tool blades made? On my little lathe I have found that I simply can not use 1/8" HSS blades but the 1/16" ones work OK. I'm getting ready to tool up my 16" lathe and I'm wondering .. Grant Erwin Kirkland, Washington |
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HSS lathe cutoff/parting tool question
In article , Grant Erwin says...
Why don't people always use the thinnest parting tool blades made? On my little lathe I have found that I simply can not use 1/8" HSS blades but the 1/16" ones work OK. I'm getting ready to tool up my 16" lathe and I'm wondering .. Rigidity counts. The larger machine will be able to handle a wider tool without chatter or breaking simply because of its mass and solidity. Really lathes should not be rated in their swing or length, but rather, 'how much linear length of tool can you engage in the workpiece before it all comes unglued.' Jim ================================================== please reply to: JRR(zero) at yktvmv (dot) vnet (dot) ibm (dot) com ================================================== |
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HSS lathe cutoff/parting tool question
jim rozen scribed in
: Rigidity counts. The larger machine will be able to handle a wider tool without chatter or breaking simply because of its mass and solidity. Really lathes should not be rated in their swing or length, but rather, 'how much linear length of tool can you engage in the workpiece before it all comes unglued.' hah, by the time the marketing droids get done with that it'll also be useless swarf, steam and wind -- David Forsyth -:- the email address is real /"\ http://terrapin.ru.ac.za/~iwdf/welcome.html \ / ASCII Ribbon campaign against HTML E-Mail - - - - - - - X If you receive email saying "Send this to everyone you know," / \ PLEASE pretend you don't know me. |
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HSS lathe cutoff/parting tool question
jim rozen scribed in
: Rigidity counts. The larger machine will be able to handle a wider tool without chatter or breaking simply because of its mass and solidity. While this is certainly true, a retired machinist friend told me the following trick: I have one of those blade sliding in a holder cutoff tools. The blade is 3/32" wide and was giving me a terrible time with chatter on my Smithy 3-in-1. My friend suggested that I grind the front of the tool less steep - i.e. smaller clearance angle. A little experimenting to get it just right and no more chatter. Ted |
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HSS lathe cutoff/parting tool question
I think it is a matter of the diameter of the part being cut off. A
1/16 blade is good for things less than a 1/2 inch in diameter, but not so good for 4 inch dia stock. So if you are going to part 4 inch stock, you have a thicker tool and then just use it for all parting. Dan Grant Erwin wrote in message ... Why don't people always use the thinnest parting tool blades made? On my little lathe I have found that I simply can not use 1/8" HSS blades but the 1/16" ones work OK. I'm getting ready to tool up my 16" lathe and I'm wondering .. Grant Erwin Kirkland, Washington |
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