On Sunday 10 February 2013 17:20:45 Andy Pugh did opine: Message additions Copyright Sunday 10 February 2013 by Gene Heskett
> On 10 Feb 2013, at 14:05, Gene Heskett <ghesk...@wdtv.com> wrote: > > So, I need a 12mm bore, 18mm OD, .2mm thick shim washer to space the > > center races apart far enough that when I put the end cap back on the > > block, pushing in on the outer races, they will > > Turn a cup shape on the lathe, part off to the desired thickness. > I wouldn't try for exact thickness, in fact I would shim the outer races > and adjust the nip with the nut. Since the lathe was apart, I first tried a loop of 30 gage kynar wrapping wire, stripped. But that apparently disappeared into the bevels on the outer edge of the races. So I jumped to a piece of 20 gage, which when assembled & the end cap torqued well down, left a 6 or 7 thou gap between the block and the end cap. Then, drawing fairly snug on the nut, I was able to get the end slop down to about 0.0017". Still about 0.0036" at the toolpost because of its heavy back tail tends to make it climb the front V-way, but thats 10x better than it was two weeks ago. Chucking up a hunk of 5/8" cold roll rod, I zeroed the lathe using the pcb faced gage block I'd made, I fired off some gcode to make a 209 nipple for one of my BP rifles. Off size, my code was junk, fixed that, teaching me how to write better code, and 3 cycles later I had a perfect part that was about a thou over sized on the outside. More to do on it of course, but that is certainly close enough for my BP rifle. The thread isn't cut yet, thats a separate operation anyway. That code will also need work as I wasn't aware that the x drive screw had gotten loose from its anchor in the cross-feed bearing, so I had to cut that open & tighten that up again. That is the joint using the difference in the threads tpi to tighten a tapered joint. Hopefully it will stay tight this time. I also set some soft limits to keep from running out of screws. So I'm getting there. :) Overall, I may yet dress this thing up as a silk purse, hiding everything but the blue paint on this sows ear. :) 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> If everything is coming your way then you're in the wrong lane. I was taught to respect my elders, but its getting harder and harder to find any... ------------------------------------------------------------------------------ Free Next-Gen Firewall Hardware Offer Buy your Sophos next-gen firewall before the end March 2013 and get the hardware for free! Learn more. http://p.sf.net/sfu/sophos-d2d-feb _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
