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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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Tapping with keyless chuck on lathe
Sometime back one of our esteemed members posted that
if his machine had reverse, that he would only use a keyed chuck on that machine. I've been pretty much spoiled by keyless chucks. I'm trying to decide whether to buy a keyless or keyed chuck for a lathe. If I'm just drilling a hole, keyless is just fine. Putting a tap in the keyless and tapping wouldn't be a problem because you are still going forward. But when you put the lathe in reverse to remove the tap, would the tap loosen in the chuck? I would assume that there is less resistance pulling the tap out, so maybe it wouldn't loosen. Also I assume if it did loosen, the worse that could happen is I'd have to remove the tap by hand. So I'm looking to those with the experience to help me decide. Thanks, Wayne |
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Tapping with keyless chuck on lathe
Wayne wrote:
Sometime back one of our esteemed members posted that if his machine had reverse, that he would only use a keyed chuck on that machine. I've been pretty much spoiled by keyless chucks. I'm trying to decide whether to buy a keyless or keyed chuck for a lathe. If I'm just drilling a hole, keyless is just fine. Putting a tap in the keyless and tapping wouldn't be a problem because you are still going forward. But when you put the lathe in reverse to remove the tap, would the tap loosen in the chuck? I would assume that there is less resistance pulling the tap out, so maybe it wouldn't loosen. Also I assume if it did loosen, the worse that could happen is I'd have to remove the tap by hand. So I'm looking to those with the experience to help me decide. Thanks, Wayne Occasionally the keyless chuck (Albrecht)loosens up when reversing. All I do is put a little tightening torque on it by hand while reversing and it holds fine. I'd never give up the keyless just for this reason. |
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Tapping with keyless chuck on lathe
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Tapping with keyless chuck on lathe
Wayne wrote:
Sometime back one of our esteemed members posted that if his machine had reverse, that he would only use a keyed chuck on that machine. I've been pretty much spoiled by keyless chucks. I'm trying to decide whether to buy a keyless or keyed chuck for a lathe. If I'm just drilling a hole, keyless is just fine. Putting a tap in the keyless and tapping wouldn't be a problem because you are still going forward. But when you put the lathe in reverse to remove the tap, would the tap loosen in the chuck? I would assume that there is less resistance pulling the tap out, so maybe it wouldn't loosen. Also I assume if it did loosen, the worse that could happen is I'd have to remove the tap by hand. So I'm looking to those with the experience to help me decide. Thanks, Wayne Depending on the size of taps you are using, keyless can be a good or not so good choice. Every time the grip is loosened by the action of the tool, whether from reversal or slipping in forward, the chuck jaws get some amount of damage. An Albrecht is an expensive tap holder. I'm not saying I don't use my Albrechts to tap, just use discretion. Some time ago, when using a 3/4" keyed chuck to hold 7/8 and 23 mm taps in the tailstock to tap chromo, I would get slippage. On investigation, I learned that Morse taper tap drivers have been available since before I was born.g Look ma, no more slippage. michael |
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Tapping with keyless chuck on lathe
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Tapping with keyless chuck on lathe
In article ,
Gunner wrote: On Wed, 12 May 2004 23:32:38 -0400, Ned Simmons wrote: In article 51701a28.0405121708.78d0be37 , says... [ ... ] A keyless chuck that's worn and/or been greased in the wrong places may cause problems. The chuck will feel springy when being tightened and release too easily when reversed. Ned Simmons Ive pretty much stopped using keyless chucks on my mills when tapping as it seems they nearly always slip for me. So Ive reglegated them to the drill press or drilling only..which can be a problem as Ive a lot of screw machine drill bits (left handed) There are special Albrecht chucks with diamond grit in the jaw faces, designed to grip hardened shanks like mill shanks or taps. There are also Albrecht chucks with a locking ring to prevent unintended loosening. However, swapping in a Jacobs geared chuck is cheaper. :-) And I would use a TapMatic tapping head on the mill, just as I do on the drill press -- unless I had a CNC which could measure the angular rotation of the spindle, and feed proportionally, and do the same in reverse for rigid tapping. Enjoy, DoN. -- Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
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Tapping with keyless chuck on lathe
You can often improve a keyless chuck that releases too
easily. Disassemble and degrease the parts. Check for burnishing on the conical surface inside the hood where the jaws ride. Scuff up that surface with crocus if you can see shiny tracks from the jaws. Relube the parts before reassembling, but do not get any grease on the inside of the hood or the mating surface of the jaws. Ned Simmons Ned, Translation for us Brits please. What is crocus? John |
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Tapping with keyless chuck on lathe
"John Manders" wrote in message ... You can often improve a keyless chuck that releases too easily. Disassemble and degrease the parts. Check for burnishing on the conical surface inside the hood where the jaws ride. Scuff up that surface with crocus if you can see shiny tracks from the jaws. Relube the parts before reassembling, but do not get any grease on the inside of the hood or the mating surface of the jaws. Ned Simmons Ned, Translation for us Brits please. What is crocus? John Presumably crocus powder or jewellers rouge - a very fine abrasive consisting of ferric oxide Andrew Mawson Bromley, Kent, UK |
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Tapping with keyless chuck on lathe
On Fri, 14 May 2004 12:01:09 +0000 (UTC), "Andrew Mawson"
wrote: "John Manders" wrote in message ... You can often improve a keyless chuck that releases too easily. Disassemble and degrease the parts. Check for burnishing on the conical surface inside the hood where the jaws ride. Scuff up that surface with crocus if you can see shiny tracks from the jaws. Relube the parts before reassembling, but do not get any grease on the inside of the hood or the mating surface of the jaws. Ned Simmons Ned, Translation for us Brits please. What is crocus? John Presumably crocus powder or jewellers rouge - a very fine abrasive consisting of ferric oxide Andrew Mawson Bromley, Kent, UK Crocus (cloth) is a (US?) generic term often used interchangeably with emery paper or cloth. In my neck of the woods, it means the fine version of the long thin rolls of abrasive. Gunner "A vote for Kerry is a de facto vote for bin Laden." Strider |
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Tapping with keyless chuck on lathe
In article , Gunner says...
Crocus (cloth) is a (US?) generic term often used interchangeably with emery paper or cloth. In my neck of the woods, it means the fine version of the long thin rolls of abrasive. Crocus cloth is actually thin cloth charged with a layer of fine iron oxide rouge. Emery is a specific mineral that used to be used for abrasive paper, but I think it is almost never used any more. There is an old emery mine near here that was being used as a quarry to supply crushed rock, the owners were under pressure to abandon it because it is in a residential area. They claimed they were still mining emery, as this would have been an original use and would be permitted under zoning. But the vast quantity of rock being removed told otherwise. Jim ================================================== please reply to: JRR(zero) at yktvmv (dot) vnet (dot) ibm (dot) com ================================================== |
#12
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Tapping with keyless chuck on lathe
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#13
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Tapping with keyless chuck on lathe
The Crocus cloth I got out of Dad was very fine material and was for polishing
Brass. Martin Gunner wrote: On Fri, 14 May 2004 12:01:09 +0000 (UTC), "Andrew Mawson" wrote: "John Manders" wrote in message ... You can often improve a keyless chuck that releases too easily. Disassemble and degrease the parts. Check for burnishing on the conical surface inside the hood where the jaws ride. Scuff up that surface with crocus if you can see shiny tracks from the jaws. Relube the parts before reassembling, but do not get any grease on the inside of the hood or the mating surface of the jaws. Ned Simmons Ned, Translation for us Brits please. What is crocus? John Presumably crocus powder or jewellers rouge - a very fine abrasive consisting of ferric oxide Andrew Mawson Bromley, Kent, UK Crocus (cloth) is a (US?) generic term often used interchangeably with emery paper or cloth. In my neck of the woods, it means the fine version of the long thin rolls of abrasive. Gunner "A vote for Kerry is a de facto vote for bin Laden." Strider -- Martin Eastburn, Barbara Eastburn @ home at Lion's Lair with our computer NRA LOH, NRA Life NRA Second Amendment Task Force Charter Founder |
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