Philthy wrote:Hhmmm like that idea of piece at a time for the heat treat oven. Do you happen to have a parts list you could email me? The oven itself with firebricks I could swing, its the electrical components that would eat my lunch.
Actually, the electrical bits aren't all that bad, especially when they can be bought piece by piece. Here's my parts list from my notes:
PID temp controller with SSR (solid state relay) output:
http://auberins.com/index.php?main_page ... ducts_id=3
$44.50
25A SSR for switching on/off the kanthal element (need 2):
http://auberins.com/index.php?main_page ... ducts_id=9
$15.00
Heat sink for above SSR (need 2):
http://auberins.com/index.php?main_page ... ucts_id=45
$10.00
K-type hi-temp thermocouple for above PID. Note, this is an ultra high temp model designed for continuous 2300F operation:
http://auberins.com/index.php?main_page ... ucts_id=39
$23.50
Kanthal wire. Need 240V 15-17A:
http://www.duralite.com/store/scripts/p ... roduct=108
$25.25
Might need staple wire to hold the elements in:
http://www.duralite.com/store/scripts/p ... roduct=110
$3.75
Need fire brick for the body:
http://www.elliscustomknifeworks.com/
$4.50 each
The running total without firebrick is less than $150. The bricks actually are expensive, and depending on where you are, you might be able to find them relatively inexpensively if you source them locally. I also once saw an electric heat treat oven made using Inswool and the interior coated in satanite - which would be an inexpensive way to go about making one.
Beyond the above, I just used some cheap angle steel and flat bar steel from the local hardware store and welded it up to make a frame. Other folks, however, bolt their frame together. You also need some hi-temp hookup wire and a couple stainless bolts, as well as a box to house the PID, a switch to turn the thing on and off, and a breaker or two if you get really high-class.
If you decide to tackle the project, let me know. I'm sure I can help you along with it.