On Sunday 12 May 2013 17:56:13 Steve Blackmore did opine: > On Sun, 12 May 2013 09:33:17 -0400, you wrote: > >I'd certainly think so. The OEM 3" 3 jaw scroll is not even a sows > >ear, 50 thou or more run out, I wound up putting it on a rotary table > >for the mill, where if I really want wrench flats concentric, I can > >program the mill to center them. It gets used more for holding tool > >bits at odd angles while I sharpen them with a diamond wheel. And in > >the most recent escapade, made a pair of .0370" and .0515" allen > >wrenches to really fit some 0-80 cap screws. You can't buy an allen > >wrench that size that actually fits them. > > Sieg chucks do vary. The three jaw chuck that came with the KC6 is > stunningly good, at most diameters it has much less than 0.0002 run out > and at worse half a thou. At 15mm it registers no run out at all :) Both > sets of jaws are as good as each other and nicely ground and trued. > > I did originally remove it from the backplate, true that and its > register in situ on the lathe, and refit then mark the body, backplate > and spindle nose so I can always put it back in the same orientation. > > However, I've seen one on a C6 that was junk. No amount of tweaking > could get it right. The thing simply wasn't concentric and was > exchanged. > > I'm pretty certain Sieg don't make the chucks they supply but buy them > in and I suspect that's one of the areas that really apply to "made to a > price" and it all depends where they were originally made. > > Steve Blackmore
Lots of folks actually believe they can shop around and get a steal. OTOH, I am fully aware that in 95% of the cases, and distribution rung, you generally get exactly what you pay for. In your case, I'd say you got lucky. I have one of the 4" 3 jaw models whose eccentricity follows the scroll as its turned. So the conclusion is that the scroll itself is duff. Its been laying on the back of the shelf since about 2 weeks after I bought it. The lesson learned is that a 4" $60 3 jaw is going to be a POS. Next class starts in about a week as I learn how to use the new found power. :) By then I might even have the 5" mounted. :) Lowes didn't seem to have any water heater elements when I was there just now, so I guess I sacrifice a 25 YO hair dryer on the alter of expediency. :) And then figure out how to put a cage on that wheel in case it unscrews itself AFTER I superglue it on... Thanks Steve. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> A truly great man will neither trample on a worm nor sneak to an emperor. -- B. Franklin A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. This 200-page book is written by three acclaimed leaders in the field. The early access version is available now. Download your free book today! http://p.sf.net/sfu/neotech_d2d_may _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
