Standard coolants work well, maybe a little weaker than usual (1-3%)
or a Cold air gun. The important thing is to keep the heat out of the
workpiece. Use very sharp tools. If using carbide inserts, high
positive ground and polished edges are best.
Blown air or even cooled air. There are companies that make liquid-free
coolant systems that work witha simple compressor. They take compressed
air and blow air at 0 or colder I think... But you may have to experiment
as it may cause the acrylic to become brittle.
Water works well. I dpn't know about the liquid soap. Cold air also
works well. Sharp tools for turning or milling. For drilling stone the
drill edges a bit to prevent grabbing. Most important: DO NOT USE ANY
OIL. NOT EVEN SOLUBLE OIL IN WATER. If oil is used, especially when
drilling holes, the acrylic will crack. It probably won't crack right
away. Sometimes overnight it will. Lots of times it takes a couple
weeks. Sometimes it may even take a couple months. But it will for
sure crack. An example of this is an acrylig pepper mill. All molded
without any drilling usually. But eventually the oil in the pepper
will make it crack. The cracks will usually start where the steel
grinder parts are pinned or screwed to the acrylic.
Eric R Snow,
E T Precision Machine
Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here.
All logos and trade names are the property of their respective owners.