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#17
February 2nd 04, 09:45 AM
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"Roger Gt" wrote in message m... "Mike" m.j.willis @rl.ac.uk wrote in message ... In order to avoid the problems you have noted, find a thicker piece of scrap material. Make a sandwich with your aluminum panel as the filler. Clamp together solidly as near to the hole position as possible. Drill through the whole sandwich. It is the only way I know to drill neat holes in really thin panels. If your panel is not that thin, say 1mm, drill a very small hole, say 1 mm using a PCB drill and open it out to the required size using a sequence of slightly larger drills and a reamer. The best way is to use a hole punch. You don't find these very often. A QMAX type cutter is a good substitute but you have to drill a hole for the screw. Fortunately, the damage caused in drilling the screw hole is usually confined to the scrap "int' middl' t'ole". A Punch is a good way if you are within about 2 inches of the edge... Try a Whitney #5 punch. You can find the punch kit and accessories here http://www.newmantools.com/roper/5jr.htm I've been using one of these for over 25 years. They also last if you don't abuse them. Can order on line at: http://order.harborfreight.com/EasyA...ht/results.jsp |
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