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>Hi All,
>
>A simple method for compensating for slight misalignments is use a
>length of vinyl tubing which is a snug fit on the ballscrew. You will
>likely have to machine a bushing to fit on the stepper motor shaft.
>
>Since you can do this with one setup on the lathe the holes will be
>concentric and the only "gotcha" is the fit of the bushing on the
>stepper motor shaft. Try for a slight interference fit and use
>Loctite grade B bearing mount on final assembly.
>
>Some further thoughts on PCB drills.
>
>If you cast your machine base out of 95% ( by weight ) mason's sand
>and 5% Clark's liquid epoxy (
><http://www.clarkcraft.com/>http://www.clarkcraft.com/ ) you'll a
>very strong base that can topped with a final thin liquid epoxy coat
>to level everything out at a cost well under $100.
>
>If you make a vacuum tight box under a work surface of MDF a shop vac
>will hold the PCB tightly in place. Since you will need some sort of
>dust pickup for the drill it makes sense to let the shop vac be your
>clamp.
>
>
>
>
>
>Be sure to visit the group home and check for new Bookmarks and files:
><http://groups.yahoo.com/group/Homebrew_PCBs>http://groups.yahoo.com/group/Homebrew_PCBs
>
>
>
>
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