On Wednesday 28 October 2009, Andy Pugh wrote: >2009/10/28 Gene Heskett <gene.hesk...@gmail.com>: >> My bed is wider and thicker over the last 2" on the right end, enough >> that if I have it snugged down, I have to loosen the gibs to get it off. >> PIMA! > >Are you sure it is thicker? Mine just had more paint on the bearing >surface for the hold-down plates at that end....
Humm, a rag soaked in acetone might just be the ticket then, was it off. >If it is thicker, then you should be able to file it to the right >thickness. I have reconditioned a whole lathe bed that way (to be >honest I was about 14 so my Dad did most of the clever stuff). We did >a shaper together a few years later taking 1/8" of wear out of the >ways. > >1) Find a reference. In the case of the lathe it was the >underneath-surface of the ways. >2) File/grind to the same thickness as the thinnest spot every 2" >measuring with a micrometer. To the top of the v or make saddle that sits mid v? >3) file/scrape the lands left in (2) using a surface plate and Blue >until just touching all the the reference spots. >4) Final scraping flat and frosting. I need to get some layout dye, its probably less mess than the magic marker I've been using. >It's actually oddly satisfying, if time-consuming. With a V-bed it is >somewhat harder. With an induction hardened bed, not easy at all. In >the case of my chinese lathe the top surface is hardened, but not the >bottom where the retaining plates run. I have NDI if my HF 7x12 is hardened. >> Using the QCTH, the tools are so far off center on the whole rig, its >> difficult to keep the cross slide from rocking up half a thou, and that >> is enough to get the chatter started I believe. Cutting with the >> compound pulled way back reduces it, a lot. > >.... > >> Things such as this have discouraged me from trying to cnc it, > >If you CNC-ed it you could throw away the compound and fit a proper >sized QCTH. That's what I did. Yes, that is a given. But where does one normally put a 425 motor on that small a saddle? I'd think for weight balancing reasons, off the back after removing the splash panel make more sense. That would also allow far better access to the back gib adjusters too. As for carriage drive, the existing screw is so bad, a whole new screw seems in order, probably w/o a half nut since its the source of the first 50 thou of backlash. Fuggly thing IMO. Just drive it with the keyboard & be done with it. Thanks Andy. -- 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) The NRA is offering FREE Associate memberships to anyone who wants them. <https://www.nrahq.org/nrabonus/accept-membership.asp> If we all work together, we can totally disrupt the system. ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
