I'm building a new pot for a member of this board, it's an adaptation of the design in post #7 of this thread:http://www.xtremesystems.org/forums/...d.php?t=158034
Thanks for posting that design flytek!
I made quite a few changes to fit the pipe I have on hand, the copper stock I have, etc.
Details:
112 holes 1/8" diameter, 0.45" deep, edges chamfered about 0.02 (didn't measure, but i did them with a CNC so they are all the same)
Base is 2.5" diameter, 1.340" thick, the edge was milled down 0.05" to leave a boss to hold the pipe ID in alignment for brazing. Brazed with safety-silv 45
Contact face is 1.890" diameter, I cut a stepped chamfer to transistion from the base to the side walls, since I was cutting with chamfering end mills and not a lathe.
8" long tube of type-M 2.125" OD copper pipe
I cut the holddown with a stepped hole so that it will hold the pipe at the top, and the armaflex insulation can be one piece. Holes are sized to fit 4mm stainless threaded rod.
I don't have a pic, but I also have stainless springs and nylon bushings to go in the springs.
I've made two pots so far, one (the one with a TC probe hole) I'll be testing with my load tester and dry ice/acetone.
I'm waiting on some aluminum to show up, and I'll make the backup plate, it'll be the same profile as the black Delrin holddown, but the holes will be tapped M4, and I'll use a stainless nut to tighten the threaded rod to the backup plate.
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