On Tuesday 28 August 2012 03:25:36 jeremy youngs did opine: > kirk the issue of this thread I have a very fine large matson mill ive > just conerted and I would like to reduce friction and I cannot afford > the 1500 bucks roght now for ballscrews it only has .005 backlash but > thats enough to screw my circles up even with backlash comensation . > So i am trying to get advice or methods that may help in the mean time
Jeremy: Pay more attention to the backlash, I have cut bearing pockets on my toy mill where the direction reversals at the 4 corners of the circle were not visible even after the bearings, some 2.5" diameter had been driven into the press fit and extracted twice as I was attempting to line up the grease hole in the race with the fitting I had installed. Due to wear in the nuts & screws as the job runs, I've found that about .0001" extra in the backlash setting comes in handy. I have ball bearing thrust washers in the xy hubs of my micromill with the big tables kits, preloaded a bit so the only backlash is in the nut. I didn't have those installed when I cut the bearing blocks for the new Z drive and the backlash in both directions was over 13 thou. Half that was in the thrust hubs. It can be done. But you may have to do it all in dig direction & put a fresh mill in for the last 5 thou of the cuts. 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! standards, n.: The principles we use to reject other people's code. ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
