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| Miner:
Hi Wong, Unless Proxxon offers an actual ER-32 collet chuck, It would be highly doubtful you'll find a off the shelf one that fits your lathe. Your 3 jaw is maxed out at 80 mm? You should have a second set of chuck jaws that are designed for holding larger diameter work by the outside diameter. That second set of jaws should have been included with your lathes 3 jaw chuck. There's a few more tips that could be mentioned about the best way to build an accurate collet chuck, But were pulling your thread off topic so I'll apologise for that. Pete |
| Fergus OMore:
This is when a faceplate is desirable- and the ability to use it. |
| wongster:
Pete, Don't be. I would like to hear how I can go about making one. The 3-jaw chuck max'd at 80mm+, with the jaw reversed. The 4 jaw allows up to slightly about 100mm, with the jaw reversed. Both are 100mm chuck. Regards, Wong. |
| Miner:
Wong, Well for starters you need to build an EXACT reproduction of your lathes spindle nose. Every dimension is as close as you can get to EXACTLY the same as your lathe has and your measureing equipment will measure to. That reproduction will be used as a proper gage while machining your embryo collet chuck. If that gage tightly fits the machined rear face of your soon to be collet chuck, Then it will fit just as tight on your lathes spindle nose. Less than .001" for tollerance would be what you'd want on all dimensions. Once that's achieved, You then accurately drill your bolt hole pattern to attach the unfinished collet chuck to your lathes spindle nose. Now you can precision bore the diameter, depth, and collet angle into that collet chuck blank. Once those dimensions are correct. You can then single point thread the collet chuck to fit your ER nuts dimensions. All of this just requires very careful work and not trying to rush the job. Any inaccuracys you machine into the collet chuck will repeate themselves in any further work you machine in that chuck. There's probably a few real good examples on this forum showing how other people have done this job. Pete |
| wongster:
Pete, Pardon me for my ignorance. When you mentioned spindle nose, are you referring to those with threads on it? If it is, I don't have any. The round plate is where the chucks, centre turning attachment, and face plate are attached to, using the M6 bolts. From the exploded diagram in the manual (all parts labelled in Germans), this round plate is part of the spindle. to mount the workpiece directly to this plate, I'll need to drill the 3 or 4 clearance holes right through. The plate measures about 100mm: I did something like what you discribed on my Sherline before, which has a 3/4-16 nose. Once I've the thread done in the middle of a work piece, I was able to machine the face and cylinder surface with it mounted on the spindle nose. The steel stock I bought: I'm trying to figure out how to start... Regards, Wong |
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