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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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Form tap geometry
On Sun, 21 Apr 2013 23:09:44 -0400, "Existential Angst"
wrote: "Gunner Asch" wrote in message .. . On Sun, 21 Apr 2013 17:24:39 -0400, "Existential Angst" wrote: "jon_banquer" wrote in message ... On Apr 21, 12:38 pm, "Existential Angst" wrote: Awl -- I've taken to form tapping aluminum (cnc rigid tapping mode), and have noticed a wide variety of geometries in these taps. The name-brand form taps I have (Nachi, Emuge) almost look like cut or hand taps, as they have between 2 and 5 sharp-edged flutes. I have others which have no flutes whatsoever (they look almost like a screw!), and others with a slight recess instead of a true groove,, and one that looks almost oval. Any insights into the preferred style of form tap? Does this style vary with context, metal, etc.?? Suggestions on best bang fer the form tap buck? -- EA I prefer Balix as it's what I've used the most frequently. I've had very good success with them. I have no comment on tap geometry. All I have ever been interested in is the end result and how long the tap will last: http://www.balax.com/ =============================================== ==== Your balax taps seem to have 1 groove. My nachi 1/4-20 has two; emuge 1/4-20 has 4, the 5/16, 3/8 has 5. http://www.emuge.com/multitap/mt-form/selection.html Sheeit, I paid list for those mutha****as..... ahma haveta to talk to haas about that.... LOL My no-name 5/16 stuff has no groove at all, looks perfectly round, like a screw. Don't know what it all means. One implication might be this: With at least one groove, the tap can release air/coolant from a blind hole. One of my worries with the no-groove imports is that they might could trap/compress coolant in a blind hole, and, well, coolant is incompressible.... Don't know if that's a valid concern, but the thought did occur. Double check and see if its perfectly round or not. A lot of form taps have a slight "dip" in one side which is where air is released. Some have a single groove along the side of a round tap. Same reason. Blind holes dont release coolant when you stick a plug in them. The 5/16 imiports I have are perfectly round!! It probably is risky using these in a thru hole, never mind a blind hole. Plug indeed. I wanted to compare these to the emuge's, but breaking taps even in scrap gives me the willies.... lol Years ago when I first started using form taps I had some that appeared to be perfectly round, however they were tri-lobed. Measuring with a micrometer they seemed round, using a vee block and an indicator showed the lobing. Eric |
#2
Posted to rec.crafts.metalworking
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Form tap geometry
wrote in message
... On Sun, 21 Apr 2013 23:09:44 -0400, "Existential Angst" wrote: "Gunner Asch" wrote in message . .. On Sun, 21 Apr 2013 17:24:39 -0400, "Existential Angst" wrote: "jon_banquer" wrote in message ... On Apr 21, 12:38 pm, "Existential Angst" wrote: Awl -- I've taken to form tapping aluminum (cnc rigid tapping mode), and have noticed a wide variety of geometries in these taps. The name-brand form taps I have (Nachi, Emuge) almost look like cut or hand taps, as they have between 2 and 5 sharp-edged flutes. I have others which have no flutes whatsoever (they look almost like a screw!), and others with a slight recess instead of a true groove,, and one that looks almost oval. Any insights into the preferred style of form tap? Does this style vary with context, metal, etc.?? Suggestions on best bang fer the form tap buck? -- EA I prefer Balix as it's what I've used the most frequently. I've had very good success with them. I have no comment on tap geometry. All I have ever been interested in is the end result and how long the tap will last: http://www.balax.com/ ============================================== ===== Your balax taps seem to have 1 groove. My nachi 1/4-20 has two; emuge 1/4-20 has 4, the 5/16, 3/8 has 5. http://www.emuge.com/multitap/mt-form/selection.html Sheeit, I paid list for those mutha****as..... ahma haveta to talk to haas about that.... LOL My no-name 5/16 stuff has no groove at all, looks perfectly round, like a screw. Don't know what it all means. One implication might be this: With at least one groove, the tap can release air/coolant from a blind hole. One of my worries with the no-groove imports is that they might could trap/compress coolant in a blind hole, and, well, coolant is incompressible.... Don't know if that's a valid concern, but the thought did occur. Double check and see if its perfectly round or not. A lot of form taps have a slight "dip" in one side which is where air is released. Some have a single groove along the side of a round tap. Same reason. Blind holes dont release coolant when you stick a plug in them. The 5/16 imiports I have are perfectly round!! It probably is risky using these in a thru hole, never mind a blind hole. Plug indeed. I wanted to compare these to the emuge's, but breaking taps even in scrap gives me the willies.... lol Years ago when I first started using form taps I had some that appeared to be perfectly round, however they were tri-lobed. Measuring with a micrometer they seemed round, using a vee block and an indicator showed the lobing. Mine must have some subtle lobing, indeed!! I'll try to discern any, but it's gotta be minimal.... -- EA Eric |
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