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HOLE SAWS A hole saw is a tubular tool with teeth filed
on the lower end of the tube. The teeth have a set to cut a
groove wider than the thickness of the tool wall. A shaft is
fastened to the top of the tube so that it can be mounted in a
drill press to drive the saw. Usually a pilot drill and guide are
provided to locate and center the hole saw. Knockout holes are
located in the top of the saw to allow removal of the discs. Hole
saws are stocked in sizes from 5/16" to 4" diameter.
Large diameter hole saws may be made by inserting a piece of band
saw blade in a groove machined in a steel disc and holding it
with set screws. Coarse tooth saws should be used for cutting
Chemcast® GP. The Chemcast® GP should be cut half way
through, turned over, and the finishing cut made from the other
side. When cutting Chemcast® GP greater than ¼" thick, a
detergentwater lubricant and coolant should be used. ROUTERS Portable and overarm routers are used for
trimming the edges of flat or formed parts, particularly when the
part is too large or awkward to use a band saw or stationary
router. Routers should have a minimum noload spindle
speed of 10,000 rpm. Twoflute straight cutters less than 1
½" in diameter will produce the smoothest cut at this
speed. Cutters should be kept sharp and should have a back
clearance angle of approximately 10 degrees and a positive rake
angle of 15 to 30 degrees. Jigs should be provided to guide the
router. |
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Copyright © Plastiglas de Mexico 1999
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