Thanks Gerry and Pat! If you recall I had written about part of the 567 cylinder head detail not printing way back when I was first experimenting with the Machine. Today, after watching a SketchUp tutorial on speeding up the display I was exploring the Styles tab and found a way to make those pesky reversed faces more obvious. I changed them from the default light green to bright red. Just for fun I went back and evaluated the 567 drawing. Everything looked okay until I peered more closely into that complicated valve area. I found out quickly why things like the cylinder head clamps didn't print. It wasn't due to my positioning or supports. It was due to the sides of the clamps being bright red. Those faces were reversed. So were the cams, the cam bearings and both ends of the rocker arms. I drew this before I learned that the STL conversion software doesn't register reversed faces. The bright red makes the reversed face pop. I fixed them all and now am excited to see how it really prints.
I got the gantry girders including rails built today. I also made a jerry rigged scheme to raise the EH roof and hold it there while working on it. I got the machine shop roof covered and started on the rain gutters. And finally I put the bells on the stack bottoms. I also sliced my left index finger in a bone-headed mishap.
Here's the lifting rig for the roof. Stupidly simple.
After I get it all lined out, I'll remove it, but leave the holes. I was lifting it by the stacks, and while they were holding, it was very tenuous. The prop does a nice job holding the roof open so I can work inside.
I had already glued one 1/4" sq piece that formed the top filler for the gantry girder, but I needed to check it against the trucks on the main rails. I found that I just needed to relieve the angular beam portion so the girder would lie nice and flat and not push the trucks outwards.
I was confident that the sizes were correct so I built the girders. They consist of the two sides and several pieces of 1/4" stock to space the girder sides. After gluing all the pieces on one side, I clamped the second side on and glued it all up.
After they were dry enough I trued all their edges so they could receive the flanged that boxed in all four sides. I have a piece of medium grit sandpaper glued to a granite surface plate that I use for all my flat surfacing operations. I hold the workpiece up to an angle square to ensure that the surfaces are not only flat, but also square.
The flange extends 0.040" on each side. I measured the width of the native girder and two pieces of 0.040" stock and measured this stack with the caliper. I transferred this to the 0.040" sheet stock and scribed the width. I scribed the strips with a long straight edge and an model knife with a #11 blade. It was doing that that got my index finger. I was having trouble with the tail end moving slightly and needed to apply more pressure. I noticed my thumb was close to the edge and moved it towards the straight edge center. What I didn't notice was that my index finger was actually hanging over the edge and drew the blade into it. Work then abruptly stopped! Being an Eliquis user, my blood clots slowly. I find that with a clean cut, direct pressure for a few minutes works well to keep bleeding minimized. I then hit it with some clean IPA, and then New Skin liquid bandage followed up with two layers of tight bandaids to keep the pressure on.
Then I got back to work.
After gluing on all the flanges I went back and trued them up, trimmed the angle pieces and prepared them to receive the rails. You can see that very little relief notch at the ends.
The hoist rail is some S-guage scale rail from a chunk that Roundhouse Trains gave me gratis. It was a piece of scrap. I cut them to length and epoxied them with 6 minute epoxy clamped to the table edge.
And here's a neat tip: I don't know where I picked this up. As a quick and disposal mixing pallet I've started using a piece of Press-n-Seal food wrap. You stick it to the table. Put the epoxy or paint or whatever on it. Mix it up, use it and then peel it off and throw it away. I also use it to seal my air brush paint bottles when their flimsy lid gaskets deteriorate. Put it on the bottle, stretch it and the screw on the cap.
I tried the hoist on to check the spacing vis a vis how the girders fit over the trucks. It fits. I'll do the final gluing of girders to trucks while the trucks are sitting on their rails. I'm going to glue some spacers between the rails to make it easier to position for the final assembly.
There are some bumper stops that I need to craft although I could grow them. In fact maybe I will. I'll combine them with some 567 prints so I'm not wasting machine time.
I used the same duct tape on the machine shop roof as I did on the main roof. The back door light is going to be tied into the foil wiring under this roof. For the main roof I'm going to run another circuit.
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The last thing I accomplished was to glue the bells on the exhaust stacks thus finishing the roof.
I was working on the gutters I ran out of time.
