Re: Milltronics VM20 and VM17, woe is me

On Tue, 29 Aug 2006 14:50:05 -0400, clutch@xxxxxxxxx wrote:

Black Dragon <bd@xxxxxxxxxxxxxx> wrote:

Anyway, back to the machine. Yesterday I was digging for the source of
some more positional error, and noticed that when I leaned on the head it
moved a few tenths. (was in the middle of picking up a work piece with
an indicator mounted on the spindle) That took me by surprise. I reached
out and pushed the head left to right with some 20-30lbs of force and got
it to move a half a thou. More if I put some body weight into it. Damn!
The rotating mass of the motor, spindle and tool probably creates more
force (case study for BB and Cliff? <g>) than me pushing on it. Now add
varying cutting forces and I've got inconsistent positional errors in
every direction.

Wow. I guess when your service guy 'fixed' the alignment the rails
were not parallel. Something had to give riding that roller coaster.

Now the question is what. Maybe you can get the company to send
someone competent or better yet find someone competent to evaluate the
machine independantly. Document everything.

Gibs or spindle pre-load?
--
Cliff
.

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