On Wednesday 26 September 2018 14:06:36 Gene Heskett wrote: [...[
> After this mornings work, the major remaining error is the nearly 4 > thou the z screw moves endways because of a poorly fitted thrust > bearing. Thats too much backlash to correct with lcnc. And 3x the x > backlash. Its a bear to get off to fix the preload which does not now > exist. But it will be a good project while I wait for the stuff I > ordered last night. I'll have a week to entertain myself before that > stuff arrives, by which time I'll have had a couple near beers to > celebrate my 84th. :) I did that today inserting short bits of 10 thou shim between the outer races of the twin AC ball bearings in the thrust bearing, which was about 5 thou too much, but the clamp nut driving the inner races has an excellent locking facility, so I took it up to to zero lash, and another 5 degrees for preload. Z backlash is now about 2.0 thou. But in double checking x, I found it up to about 4 thou, quite dependent on the location of the x table. I dialed the pulley the motor drives, zero end play there. That leaves the screws in the end of the nut cage, driving a plate with a tapered bore at a 45 degree angle, compressing a felt ring into the screws threads to serve both as a swarf wiper, oiler AND the endplay adjuster in the shop made nut cage. The felts outer edge has a finite thickness, and the felt seems to be doing a final collapse. Pulling that out to get to those screws is a bigger project than I wanted to tackle yet today, so thats tomorrows chore. I /think/ they are on the back face of the nut cage, so uncovering the rear face of the well covered tunnel that screw turns in, might let me get to them w/o a full disassembly of the carriage. I was attacked on the phone by a phisher today, so stopped the card and got a new one. I'll see if between the fuzz and the banks security they can stop him before he hurts somebody. If I find him first, the fuzz won't have to worry. Like Marion Morrison (aka John Wayne) once said, stupid should hurt. But not for long... -- Cheers, 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> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
