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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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Steve Lusardi -- lathe update
On Thu, 08 Jan 2009 23:42:02 -0600, Ignoramus7855 wrote:
Steve, your test bar should be picked up tomorrow. Thank you. I spent a long time with my lathe. Here's what I found. 1. The lathe spindle itself does not seem to be bent (when turned and watched with a dial indicator). 2. The three jaw chuck, when mounted on the Lo mount, simply does not point straight. This is clear if I mount it carefully and turn it while looking at a dial indicator tracking its outside circumference. 3. There is a considerable amount of crud in the inside of the three jaw chuck, where it mates to the spindle. Such as, bits of swarf imbedded in the soft inside of the chuck. As well as irregular structure from impact of said swarf. Obviously, someone tried to mount a very dirty chuck once, to its detriment. I took a drill bit and carefully lifted that crud off using that drill bit as a scraper. I also very thouroughly cleaned the Lo spindle surface, which now looks great and checks out well dith dial indicator (0.001" or so) 4. I then noted that I have a four jaw chuck, which I was reluctant to use before. Iggy, set your lathe to the tpi of the spindle, mount the four-jaw, hold the three jaw in it with the threads outwards (or hold the mounted four-jaw with the three-jaw, same orientation). Indicate to make sure the body is square and centred, then clean up the three-jaw threads with a threading tool in the tool-post. I would probably turn the chuck by hand while doing this, so as not to change the depth of the threads and to stop before I hit the bottom. |
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Steve Lusardi -- lathe update
On 2009-01-09, _ wrote:
On Thu, 08 Jan 2009 23:42:02 -0600, Ignoramus7855 wrote: Steve, your test bar should be picked up tomorrow. Thank you. I spent a long time with my lathe. Here's what I found. 1. The lathe spindle itself does not seem to be bent (when turned and watched with a dial indicator). [ ... ] 3. There is a considerable amount of crud in the inside of the three jaw chuck, where it mates to the spindle. Such as, bits of swarf imbedded in the soft inside of the chuck. As well as irregular structure from impact of said swarf. Obviously, someone tried to mount a very dirty chuck once, to its detriment. I took a drill bit and carefully lifted that crud off using that drill bit as a scraper. I also very thouroughly cleaned the Lo spindle surface, which now looks great and checks out well dith dial indicator (0.001" or so) 4. I then noted that I have a four jaw chuck, which I was reluctant to use before. Iggy, set your lathe to the tpi of the spindle, mount the four-jaw, hold the three jaw in it with the threads outwards (or hold the mounted four-jaw with the three-jaw, same orientation). Indicate to make sure the body is square and centred, then clean up the three-jaw threads with a threading tool in the tool-post. I would probably turn the chuck by hand while doing this, so as not to change the depth of the threads and to stop before I hit the bottom. Only one problem with this. It would work with a threaded spindle, but his spindle nose is *not* threaded, only tapered with a key. (It should be called "L-0" not "Lo"). It is one step larger than my L-00. There are threads -- but they are on the OD of the socket on the back of the chuck, and a threaded collar screws onto this to draw up the chuck good and tight to the taper. I guess that he might be able to turn the ID of the tapered socket clean, but it is tricky to set it up accurately enough, and I'm not sure that his compound has enough travel to do it all in one setup. (The nose taper is too steep for the usual taper attachment.) 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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