Hi Terry,
I don't know much about computers myself, and even less about CAD programs. I've tried a couple of shareware CAD programs and been totally lost, only to give up and be glad I didn't spend any model train bucks on them. The only ones I've been able to figure out at all are the old Atlas Right Track (which understandably is limited to only Atlas product libraries) and now the Railmodeller which seems very similar to Atlas. I'll probably end up purchasing the full version of RM if I don't find any major learning curve problems as I progress with it.
As for the module in the photos, it is a 3x166mm module, and it's dimensions are: length-497mm (19-9/16"), width-304mm (just a tiny bit shy if 12" - Ooops, Not my fault!), and the front fascia height is 70mm (2-3/4"). The module itself is supposed to be 1mm less than the track length, so that the track can extend .5mm beyond either end of the module in order to make sure that the module doesn't interfere with the joining action of the railjoiners, which need to "click" into place in order to function properly. My module is built using 1/8" thick Poplar plywood from the R/C aircraft department at the LHS, plus a piece of scrap doorskin (for the fascia) left over from a previous project. It is reinforced with 3/8" hardwood square stock (Poplar, I think), and the 2-1/8" tall legs in each corner are made of 1" square stock. Holes are drilled all the way through the center of legs (and the plywood, too) to provide clearance for the 1/4"x20 tee nuts and 2-1/2" long Phillips flat head screws that provide level adjustment. The wood for the legs is cut short of the 2-1/2" of the screws to allow for clearance of a stop nut and vinyl anti skid/scratchpad glued on the head of the nut. Both sizes of square stock came in 3' lengths and were purchased at Home Depot in the molding department, although I have seen similar stock at Lowes. I cut the plywood using an Xacto knife guided by a 12" stainless steel ruler and a 6" machinist's square, and the square stock was cut on a powered miter saw. The plywood came from the LHS and was pre-sized at 12"x48" (although it was actually just under 11-7/8" wide, I didn't measure it's length). The width being shy by about an eighth of an inch was compensated by the fascia thickness, so it wasn't a big problem.
My first step was to cut the plywood deck to length, using the square and a sanding block to keep it as square and as close to the desired measurements as possible. Then the 3/8" square stock was added to the perimeter of the cut plywood using Titebond III glue, and a lot of little plastic spring clamps from Harbor Freight, being very careful to make sure that the 3/8" stock is glued on square and flush with the edges of the plywood. Be sure to wipe off any excess glue that oozes out of the joint with a wet towel, it won't sand off easily once it's cured. Check your measurements and use the machinist's square frequently during the process of gluing each piece on to be sure everything stays square. Once the perimeter strips were applied, the legs were glue into the corners of the plywood, tightly against the 3/8" strips. at the front of the module, I glued an additional 3/8" square strip to support the bottom of the fascia, flush with the bottom of the legs. I used a 35mm long pieces of the 3/8" square stock, glued flush with the out side edges of the legs on either side to help locate the fascia support stinger, and fill in the gap between the fascia and the legs. I like to use a similar strip of 3/8" square stock on the back legs of modules longer than 12", even though I don't use a rear fascia, just for added support. At the back, I cut three 35x50mm pieces of 3/8"x2" basswood sheet to act as vertical spacer/filler pieces for the rear stringer, similar to the 3/8" square pieces on the front legs. The third piece is glued between the top and bottom stringer, halfway between the legs, to provide extra support for the top of the module to help prevent sagging. These pieces are made 2" wide so that they can be drilled to accept tee nuts or attaching backdrop/skyboards to the module, if desired. I didn't install them during construction, but I think I may add an additional stringer down the middle of the underside of the module, or maybe two (one under the centerline of each mainline) for added support. One under each mainline would be best, especially if there are no turnouts on that module, since it would not only give added support against sag, it would also give any track nails or screws something to bite into. However, under a turnout, such a strip could get in the way of switch machine linkage.
After the basic module platform is built, I like to cover all surfaces with a coat of Minwax solvent based clear satin polyurethane varnish to seal the wood. On the top, I try to brush it on well so that it doesn't build up a thick layer that might impede the bonding of scenery materials, but will still prevent the wood from soaking up a lot of excess water during the scenery process, which could cause warping or separation of the plywood.
That's the basic rundown on my construction of my first T-Trak-TT module, using some of the techniques I have learned from build a few T-Trak-N modules. Hope it helps you get started on your module(s).
Regards,
Bill
view 3.jpg
You do not have the required permissions to view the files attached to this post.