After careful consideration, I realized that the initial location I had selected for the ‘afterthought’ 34-inch Millhouse River Studio turntable would have required a lot of framing (2x4’s) to be cut, and reinforcements added. Consequently, I changed the location and ended up needing to cut only three 2x4’s,and add two short pieces and one leg – not a big deal.
One thing I wanted to do was to install the TT such that it could double as a maintenance hatch without having to remove the TT completely. A hinged TT would be very desirable, so that is what I set to do.
Here are some details of how I did it. BTW, I have not decided yet whether to fit a roundhouse with the new TT location, but if not, straight engine sheds will work fine.
This is how the area looked before I had even considered the TT.
A portion of the 5/8-inch plywood top and some of the frame 2x4’s cut. I marked the hole with one of the ‘compasses’ I had used to lay HO track some 25 years ago.
After adding the necessary support underneath for the additional 5/8-inch plywood to fill in part of the rectangular access hole cut to match the TT, I set the TT to double-check for fit, from the top.
Support dolly to help stage the TT in place under the layout. Dolly is a horse over a furniture dolly. This really makes it easy to handle the TT by myself.
TT held up against the bottom of the layout. The TT rests directly on the sawhorse to clear the layout frame, and then I used spacers to raise it.
Door hinge installed on wood spacer that will be screwed to 2x4 layout frame member, and the other side with machine screws threaded on the TT aluminum channel. I tapped (#10-32) the channel and also used nuts to backup.
Six blind 1/4-20 T-nuts inserted from the top, and also two FH 1/4-20 machine screws. The blind nuts are for the thumb screws, and the machine screws for the wing nuts. The two D-batteries you see is what I used to power the TT while I was installing it to get an idea of the alignment of the tracks, shed, etc.
I had to trim two of the TT mounting tabs to clear the 2x4 frame. Here is one example.
One of the two chains to support the TT when lowered. Notice the thumb screw is just inserted and I have not tightened it yet so you can see how it looks. Why nylon 1/4-20 thumbscrews? Because I already had them! They will do fine to support the TT together with the two metal wing nuts/machine screws and the hinge.
One of the two wing nuts already installed and tightened.
Here is the TT lowered.
Close up of the hinge when TT is lowered.
A place to keep the thumbscrews and wing nuts when these are not securing the TT.
QuietBrace cut and in place, some of the tracks, and an engine shed. I still have to fill in the rectangular access hole, but I have not decided yet what to do there. Probably, the approach track to the TT will go over this now-open area, and the shed or roundhouse will extend to the right (in the picture).
And now to continue with the work. Fun, fun fun!
Thanks for looking!
See the layout under construction here Alex's Layout