Re: [CAD_CAM_EDM_DRO] Backlash on Harbor Freight Mini Mill

mmeyers1111 wrote:

>In the Photos section of this group there is a concept drawing of a
>screw-nut modification to reduce backlash. It is photo 17 of 63.
>
>"Photos / No backlash nut concept for mini mills / bigger textno
>backlash nut.jpg"
>
>It was created by TATTOOS4UNME on 28-Sep-2002
>
>1) Has anybody tried this approach to reduce backlash on those
>mills? How well did it work?
>
>2) Does anybody have any better inexpensive method to reduce
>backlash? I'd rather not replace everything with ballscrews and
>ballnuts or similar more expensive approaches as I don't use it
>enough to justify spending a lot of cash.
>
>

At least the mini-mill I got had no bearings in the Y axis leadscrew
bracket. A very slight step on the leadscrew and the handwheel
were the "thrust bearings" that rode against the bracket. A terrible
design, and hard to understand, as there were 2 opposed ball bearings
in the X bracket! So, I did some carving of the Y bracket to accomodate
2 small ball bearings in a manner very similar to how the X one was made.
I also faced the outer portion of the handwheel so that it would only press
against the inner race of the ball bearing.

Jon