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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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Where to find an 11/32" lathe chuck key?
I recently purchased a used 4-jaw chuck for my Atlas 12" lathe.
The problem is that none of my chuck keys will fit it. The 3/8 is too large, and the 5/16 marginally too small, so unless it's some ******* metric dimension, an 11/32" inch square chuck key would be perfect. The problem is that I can't find any on eBay or even in the tool catalogs. The question is: "Does anyone know where a can purchase a 11/32" square chuck key for a lathe 4-jaw chuck? Thanks in advance. Harry C. |
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Harry, in the past when I had this problem I ground a little off of each
side of the 'square'. Lasted for years. Gary "Harry Conover" wrote in message om... I recently purchased a used 4-jaw chuck for my Atlas 12" lathe. The problem is that none of my chuck keys will fit it. The 3/8 is too large, and the 5/16 marginally too small, so unless it's some ******* metric dimension, an 11/32" inch square chuck key would be perfect. The problem is that I can't find any on eBay or even in the tool catalogs. The question is: "Does anyone know where a can purchase a 11/32" square chuck key for a lathe 4-jaw chuck? Thanks in advance. Harry C. |
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"Harry Conover" wrote in message om... I recently purchased a used 4-jaw chuck for my Atlas 12" lathe. The problem is that none of my chuck keys will fit it. The 3/8 is too large, and the 5/16 marginally too small, so unless it's some ******* metric dimension, an 11/32" inch square chuck key would be perfect. The problem is that I can't find any on eBay or even in the tool catalogs. The question is: "Does anyone know where a can purchase a 11/32" square chuck key for a lathe 4-jaw chuck? Thanks in advance. Harry C. Hi Harry. Other posters have suggested serviceable solutions to your problem, (grinding), but I just have to giggle a little at your characterisation of metric dimensions as "*******s", when you seem quite happy to work in illegitimate fractions like 11/32"! Just as well it wasn't 21/64", or 43/128", huh? (Sorry for kicking this dead horse) ;-) -- Jeff R. |
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#5
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In article ,
Harry Conover wrote: I recently purchased a used 4-jaw chuck for my Atlas 12" lathe. The problem is that none of my chuck keys will fit it. The 3/8 is too large, and the 5/16 marginally too small, so unless it's some ******* metric dimension, an 11/32" inch square chuck key would be perfect. The problem is that I can't find any on eBay or even in the tool catalogs. Who made the chuck? It may well be a metric dimension. My calculations suggest that it may be 8.75 mm (your 11/32" converts to 8.7313 mm The question is: "Does anyone know where a can purchase a 11/32" square chuck key for a lathe 4-jaw chuck? Do you have a milling machine? If so, get one of the square 5C collet holders (usually comes in a set with a hex one), add a collet to match the diameter of the stock (I used drill rod for mine, because that is what I had handy), turn the end to the diagonal measure of the square socket, clamp it in the milling vise and mill a bit off one side. Rotate it 90 degrees and mill again, repeat until you have done all four sides, then measure the size of the (partial) square you have produced. Subtract the desired size from it, and divide by two to tell how far to advance the qull or crank up the knee, and mill all four sides again. Keeping it in the collet chuck, test the fit in the chuck you are fitting, and if it right, turn the workpiece around in the collet chuck and cross-drill the other end for a press fit of the handle. Drill it to be a slide fit, and knurl the middle of the handle for a press fit. 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 --- |
#6
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A.Gent wrote:
"Harry Conover" wrote in message om... I recently purchased a used 4-jaw chuck for my Atlas 12" lathe. The problem is that none of my chuck keys will fit it. The 3/8 is too large, and the 5/16 marginally too small, so unless it's some ******* metric dimension, an 11/32" inch square chuck key would be perfect. The problem is that I can't find any on eBay or even in the tool catalogs. The question is: "Does anyone know where a can purchase a 11/32" square chuck key for a lathe 4-jaw chuck? Thanks in advance. Harry C. Hi Harry. Other posters have suggested serviceable solutions to your problem, (grinding), but I just have to giggle a little at your characterisation of metric dimensions as "*******s", when you seem quite happy to work in illegitimate fractions like 11/32"! Just as well it wasn't 21/64", or 43/128", huh? (Sorry for kicking this dead horse) ;-) -- Jeff R. you would like 5334/16256 mm maybe ? Martin -- Martin Eastburn, Barbara Eastburn @ home at Lion's Lair with our computer NRA LOH, NRA Life NRA Second Amendment Task Force Charter Founder |
#7
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"Martin H. Eastburn" wrote in message m... you would like 5334/16256 mm maybe ? Martin Nuh. I find fractions vulgar. -- Jeff R. |
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A.Gent wrote:
"Martin H. Eastburn" wrote in message m... you would like 5334/16256 mm maybe ? Martin Nuh. I find fractions vulgar. -- Jeff R. I think 21/64" is easier to think of myself. Martin -- Martin Eastburn, Barbara Eastburn @ home at Lion's Lair with our computer NRA LOH, NRA Life NRA Second Amendment Task Force Charter Founder |
#9
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On Sat, 21 Aug 2004 05:15:46 GMT, "Martin H. Eastburn"
wrote: you would like 5334/16256 mm maybe ? Martin 'Bout the size of a pencil hammered square? Gerry :-)} London, Canada |
#10
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I don't know where you'd find one that size. You may need to make one, and
CRS would probably be sufficient. With an endmill, you could make a suitable key on your lathe, assuming that you can mount the EM in a collet or even a 3-jaw chuck (not the best holder but it'll work as long as it's done cautiously). Grinding an existing square-ended key or other tool could be a simple solution, as suggested earlier. An old 3/8" socket drive extension would be good material for the key stem. You might not want to try drilling the extension for the handle though if it's high grade steel. Welding a section of round stock for a T handle on the end could work. I've made a few keys from CRS and they're holding up well (I like a longer stem for lathe chuck keys). For the endmill method, with a boring bar holder mounted on the lathe compound, using a shop square will get the opposing side cuts parallel. The blending radius that someone mentioned makes a good looking finished part. A tool that I find useful is a 1/4" drive screwdriver-style handle with a 1/4" to 3/8" adapter on it, it's handy for quickly setting the independent jaws on lathe chucks, then followed with the T handle type for jaw tightening. WB ................ "Harry Conover" wrote in message om... I recently purchased a used 4-jaw chuck for my Atlas 12" lathe. The problem is that none of my chuck keys will fit it. The 3/8 is too large, and the 5/16 marginally too small, so unless it's some ******* metric dimension, an 11/32" inch square chuck key would be perfect. The problem is that I can't find any on eBay or even in the tool catalogs. The question is: "Does anyone know where a can purchase a 11/32" square chuck key for a lathe 4-jaw chuck? Thanks in advance. Harry C. |
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