DJ Delorie wrote: >> How about an aluminimum plate on top of the hot plate. 3/8" would >> distribute the heat pretty well and costless than the fancy hotplate > > If I did that, first I'd bring the plate to a machinist friend and > remove as much of its existing thermal mass as I could. It's already > got more thermal carry-over than I'd like.
For heavy mass, (more wasted power), hotplates are buyable easily -- just go for old ones from the 1930's to 1950's. Here's an idea borrowed from IR soldering equipment: Buy metal film resistance heaters that connect with a welded tab that is left near a heat sink to outside, so it doesn't get as hot. For IR heating, assemble with a quartz glass side, for your app assemble with two aluminum plates and a small amount of insulation on one side, (mica), and plenty of glass fiber on the other. Then you have a low mass, even heat plate. If your design heats up the connections between resistive elements and conductors, they will always degrade, oxidize, and eventually fail. John Griessen -- Ecosensory Austin TX _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
