Re: [CAD_CAM_EDM_DRO] Drilling holes in the mill

>The (much modified) Zoltair (http://www.rcmodels.net/cnc/hobby/classic.html)
>mill project is nearing completion, only one axis to go!!, then the bench,
>then the wiring, then more wiring etc.. :-(
>
>http://www.caswa.com/mill.jpg
>
>I used a piece of Silestone synthetic granite for the bed of the machine and
>am now giving some thought to how many holes to drill in it....
>The idea is to use an\ diamond coring bit I have on order to drill grid of
>holes into which I epoxy some flanged inserts. They'll probably be tapped to
>M5. The bed is 1m long by 400mm wide and the question is, "What spacing
>between the holes?"
>
>My current thinking is that only small parts need small hole spacings, and
>small parts don't need as much z height so having larger spacings (75-100mm)
>in the bed and bolting a fixture plate with closer spacings (25mm) is OK.
>
>I could just go to smaller spacings (50mm?) but I'm worried about weakening
>the Silestone. On the other hand, Z height is my critical resource.
>I'd really like to not stuff this up....
>
>