On Saturday 28 October 2017 08:29:38 Nicklas SB Karlsson wrote: > > ... > > > > > It might be a good idea to turn by hand and check if load is same > > > in both direction. To run motor without load in both directions is > > > also a good idea. > > > > From the hand on the spindle test, or from the top of the tight > > drawbolt it turns with equal ease in both directions. > > Then I think to check voltage is same in both directions is next step. > > On my first machine at home one of the joints is very hard to turn by > hand. There are basically sliding surfaces so not much could be wrong > but it still pussle me how I should pin point the problem, any idea? > Gibs too tight? No lube? If ball nuts, miss-aligned because the bearing boss on the end of the table has slid a few thou as it was being torqued up?
My little hf x1 (retrofitted with the bigger tables) has to be screwed completely in before the bearing bosses are tightened down so they are aligned well. They've been fitted with ball thrust washers but the bearings are the original zero clearance, so any nut miss alignment even though they are tiny ball screws is pretty critical because it makes that bearing at the end of the table bind pretty bad. In addition to drilling out the mounting holes about 20 thou so they could move to align with the new nuts, I drilled them for grease fittings, but the shaft clearance is so small it takes minutes to push 1/4 of a stroke of the grease gun in. A teeny little groove will get machined to match the pinhole the next time I have it apart. Hind sight, 20-10. :) Cheers Nicklas, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
