On Sun, 14 Jul 2019 at 03:25, John Dammeyer <[email protected]> wrote:
> > Work holding is the issue. What's an ideal process? If you are making one, what I would do is: Machine to width and length. Clamp in the vice supported by parallels [1]. Possibly with a bit of polystyrene packing or a loop of cable tie or similar to keep the parallels from wandering. Skim the top surface, Machine the slots all the way through (or not quite all the way through if a parallel is in the way. Drill the holes deep enough to meet the rebate. Turn over in the vice and use parallels that allow the rebate to be machined, skim to finished thickness (opening up the slots if not milled through) and mill the rebate. If there were features on the other side that needed to be positioned then I would have the G-code origin for that side be one of the through-hole centres and would probe that for the second ops. [1] It's well worth getting a set or parallels, I have these: https://www.amadeal.co.uk/acatalog/Precision-Parallel-Set-8pair-set-8x120mm-AMA_AC_637_7972TD.html though I imagine you would look for a set closer to home, and would be able to pay rather less. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1916 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
