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| Proxxon PD400 |
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| wongster:
I'll experiment with different speed with the power feed at different cut depth some more. Will try to get some "known" steel so that I can be more consistent in the future. Now that school and work started, shop time will get lesser and lesser after the Lunar New Year, which is towards the end of this month. One thing I like about this bigger lathe (relative to my sherline) is when facing. When I've 40 to 50mm sticking out of the chuck jaws and stock is about 20 to 25mm in diameter, even at 0.25mm per pass, I don't have the stock flying out of the chuck. I was so worried about that happening when I did my first face cut. I believe I'll get myself comfortable after a few sessions. When feeding under power, I was so afraid that the tool crash into the chuck initially. Thanks for all the help I get from this forum. Regards, Wong |
| grayone:
Hi Wong I think the run-out you have on the chuck is well within the specs for a Rohm self centering chuck and the only way you will get better without surgery is to use a 4 jaw independant. One point mind is that the chuck can be installed in any one of three positions. What you can try it ot remove the chuck, make sure the backplate and register are very clean, and refit it one hole rotated in th back plate. Do this three times and check the run-out each time. When you find the best setting it was practice to put a light pop mark on the chuck with a matching one on the back plate so that when you refit at any time you pick the best postion. Graham And a happy Year of the Dragon :wave: when it arrives |
| wongster:
Thanks Graham. I'm looking forward to get a 4 jaw chuck and a collet chuck but have to do that after the lunar New Year or later to stay under teh radar... I've a set of ER32 collets bought with a chuck that is threaded 3/4-16 for my sherline sometimes back. Didn't use the chuck as the run-out is ridiculously high. Bought a metric set of ER32 from other source (CTC Tools) but have not used them once. Littlemachineshop.com sells ER32 chuck at USD199, a better looking price than the Proxxon collet chuck. I didn't know that turning the 3 jaw in the base plate would have effect on run-out. Will try it out and measure the effect. Regards, Wong. |
| andyf:
Wong, ER chucks tend to be cheaper in the UK than the US. Many guys in the US find it more economical to buy from the UK, despite the higher shipping costs. Check these to see if the register diameter and the PCD of the fixing bolts would suit your spindle flange: http://www.arceurotrade.co.uk/Catalogue/Collets/ER-Lathe-Collet-Chucks One from Proxxon will probably be more accurate, though if a cheap one has unacceptable runout, it is not too difficult to re-bore the taper. Andy |
| wongster:
Andy, I'll check that out. Thanks for pointing me to the site and your suggestions. Will find out what's required on mine before making the move. Want to avoid boring taper at this moment till I've more knowledge. Regards, Wong |
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