Heat Treatment Oven Build Process
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Posted 2nd January 2025
I started the afternoon with a repeat of the last job of the morning: routing out the slots in a second set of bricks (after cutting the rebate in one as I'd dropped one of the set and it had got damaged):
With the grooves finished I was very happy to be able to put all the routing paraphernalia away and get on with another job. It was perhaps a little unusual that I didn't need ear defenders for the electric router (as it was running on its lowest speed setting and cutting something relatively soft) but I did need ear defenders for the hand tool job that followed it: hand filing the openings in the door to get a good fit for the various things that will go in.
With the holes suitably fettled I moved onto the back panel and laid out the trunking and DIN rail to suit the various bits that were going to be fitted there:
I could then drill the holes in the back of the panel. My original plan had been to drill these with a 4 mm step drill and then countersink them for M4 countersunk screws. I did that...
... but (as I should have realised) the metal was too thin for a good countersink so once I'd deburred the inside surface, I ended up with an oversize hole with not much countersink left. To resolve that, I fitted the various bits and pieces using cap screws and penny washers on the outside and with nuts and normal washers on the inside. In a surprising rebuff to Murphy, I had exactly the right number of M4 penny washers for the job!
Finally, I could retreat to the relative warmth of the dining room and fit all the various bits and bobs into the door panel and get an idea of what it will look like:
Now that I can fit stuff to the front and back of the cabinet, I can work out the required depth and cut the last four bits of cabinet angle iron to length. Hopefully tomorrow I'll get the cabinet frame welded together and start preparing the sheets for the sides, top and bottom.
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