[mfg-smartcam] Drilling stacked plates

[Larry Jacobs]

I have an application involving stacked brass plates (10" x 16"  -- .030 thick  -- stacked 30 to 50) for our EDM.   1" extra stock is allowed for clamping purposes around the perimeter and  1/4 alumimun plate is used underneath for rigid support. Drill size is 3/16".   Any suggestions as to maximum thickness of plates, special drill points (Bickford, double angle),or procedure (pecking as opposed to straight through) to keep holes straight (within +/-.005) and minimize chips and burrs?   Thanks, Larry J