RE: [mfg-smartcam] Drilling stacked plates

[Bob Looney]

I have never done  it but I would think several layers of 1/2" steel plate, top, btm, and middle might get you some rigidity towards the center of the plate. 10 x 16 seems awful large for just a 1/4" alum backer. just a thought. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Larry Jacobs Sent: Monday, December 03, 2001 11:40 AM To: SMARTCAM Subject: [mfg-smartcam] Drilling stacked plates 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