Finally, got into the shop.
Checked out the match of the bottom of the main box and the Gear cover. The trick here is that the hole to be drilled into the main box, the lower cover and the gear cover. The bearings are on the split. This is where the gearbox is lowered onto the axle, align the axle gear properly, tighten the set screw hard. Attach the gear cover and the gearbox install is complete. The tooling is good, but I need to make a different clamp to hold the ass’y of the main box, lower cover and the gear cover. With that in place the bearing hole for the axle can be drilled.
Also tackled an old problem, for a new customer. He wanted to buy some Bachmann replacement plunger contact sets. I quoted a price of $5.00 for four. Then got to thinking I really didn’t want to sell them, know that in a short period of time they would fail. The current for the pickups travels through a very nice brass plunger, then to the spring, the backing plate, where the contact wire is soldered. The problem is and always has been that the current travels through the spring, which weakens its ability to apply pressure to the plunger and pickup current.
Well, I solved the problem for the BBT drives with track power by carrying the spring and plunger in a brass tube, the springs never fail, and th pickups have a very long life.
So the question became how to bypass the spring and collect current directly from the plunger. I enlarged a small hole in the backing plate to 1/16". Drilled a 1/16" hole in the back of the plunger. I will solder a short section of #26 or 28 wire to the hole in the plunger, thread the spring onto the bottom of the plunger, thread the wire out the back of the backing plate. Put the two screws into the backing plate and into th plastic housing. Done. The plunger can move in and out the current goes through the plunger to the wire and on to the wire harness. Feel free to use this solution and share with your friends.
One other, I have used these plungers for years as relief valves on the steam dome of a 4-6-0, the flagstaff bases on each end of Porter Pilot beams, and anyplace else it looks good.
I’ll be in the shop tomorrow.
Barry - BBT