Gene
> One other Q though. My x&y screws are 20 tip
> acme, and its cooling down,
> even with a heater running the machine is maybe at 55F
> right now, and the Y
> screw in particular is howling up a storm. Its wet,
> quite wet with a mixture
> that is part STP and vactra. I've had this problem
> before, and no lube I've
> tried seems to really be _the_ fix. Bar oil, 10w40,
> 3in1, STP, wd-40 & some
> spray stuff different from wd-40 have all been squirted
> rather liberally on
> it to no avail. I now have ball bearings in the
> bearing bosses on the end of
> the tables, and a grease fitting drilled into the bore
> between them but
> because of the clearance, grease applies very very slowly
> there, and doesn't
> seem to effect the squeal at all. The bearings are
> mechanical seals, so
> theoretically I should be able to blow grease right on
> through them given
> enough time.
>
> Is there a magic panther pi$$ for this application other
> than money for ball
> screws?
I guess you have a similar alignment uissue I had recently. Grease did not
solve my problem. To solve it, I loosened all screws that held / fixed the end
bearings, aligned them one by one and fixed them again using loctite. My mill
has roughly 1900x550x250 mm on xyz. So the main thing was on x naturally. I
also had to loosen the "nuts" that position the x axis, turned them so they
would show easy turning and refixed them again using loctite for the fixing
screws. Then I ran a simple code that uses full extent of all axes for a couple
of hours. That wears off the brims that may have been left from thread
production and now I am going at 1300mm/min on all axes which is good enugh for
me.
I do cut wood mainly. Dust was an issue until I had my dust vent installed
(lots of air sucked in and only occasionally a rather large grain does not get
sucked in). Grease and dust bakes. My finding is, you are probably better off
using dry graphite than grease. I removed all grease and am now on graphite.
hth
chris
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