Re: Grizzly 8689 tram

I see a tram unit -
<http://littlemachineshop.com/products/product_view.php?view=classic
<http://littlemachineshop.com/products/product_view.php?view=classic&Product
ID=3651> &ProductID=3651> and a review of same
http://www.cartertools.com/nanotram.html - has anyone got some experience
with this device?

And I'd love some feedback from others on the other questions below, please.
C

Chuck Merja

Well the recent videos on Tormach attachments have created some questions,
cuz I have recently acquired an 8689 that someone else CNC'd with ACMEs, and
I'm pretty sure that I could not produce the attachments shown in the
videos, due to alignment and backlash. Here are a couple questions that
occur to me...

1 - how do you tram and maintain tram of these units? It looks to me like
there should be a turnbuckle from an outrigger leg up to the column that
would help adjust and maintain tram.

2- My unit has 276 oz-in steppers on X n Y and when I tighten the gibs
enough to take the slop out of those tables, the steppers miss steps. Do I
just need higher torque steppers, or ??

3 - The drill chuck holder in the video looks pretty interesting, although
it looks like it could be subject to ongoing axis alignment errors. But
maybe there is a clever way to align those axises?? I know boring the final
holes would help with this, but we are still subject misalignments, altho
they would result in a tapered hole, not one offset.

4 - What other attachments have folks found useful for their CNC'd mini
mills.

thanks, Chuck


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