At the top middle of the picture is a possum at the shop. It came up to me twice then skittered away after an squinty “Oh My!” look. I suppose it got a few feet away and thought “huh, why am I going this way? I thought I was going the other way.” Mark made it go away.
Final modifications to the hovercraft engine mounting plate… drilling four 3/8″ holes in 1/2″ of aluminum… a cordless hand drill would have worked fine. But that’s not The Way. Ultimately I had to correct for a bad OEM drawing of the plate on the bridgeport, but the new hovercraft engine is is ready to assemble.
This is part of a cooling system for the cabinet. This relatively inexpensive (on ebay) Watlow series 900 temperature controller has a single output and two alarm relays. The output and one of the alarm relays have snubbers inside and can trip fans on their own. The second output was NC and needed a relay to invert it. I used a solid state relay (SSR) to do it and it is currently controlling the halogen light. It turns on if the temperature goes over 81. Woo! Three more simple wiring harnesses to fabricate and then the whole mess to install in the cabinet. The concept is that a set of filtered fans will run full-time to drive fresh air into the cabinet (not quite working yet) to achieve ambient temp, say below 85 or 90 degrees. If the temperature goes above that, a single extraction fan will turn on. If it goes up another 5 degrees a second extraction fan will turn on, and 5 degrees above that a third, honking big fan will turn on. The extraction fans will probably suck in some dust, but better that than melting down.