I am in the process of rebuilding my transmission and am wondering what creative methods some have come up with to make the mandrels to hold the drums in order to static balance them on a knife edge frame. I do all sorts of metalwork but I do not have a lathe. The mandrels in Mike Bender's video look to be specific to each drum and made as a precision slip fit. Very nice, but I need a more home brew approach.
This is NOT the best way to do it. A bit tricky, but works.
Make a double "knife edge" with the two edges about 3/4 inch apart. It can be as simple as a couple VERY straight cut pieces of sheet steel about six inches long and three pieces of wood (only the 3/4 middle needs to be nice) all nailed together. Balance the drums on the edges (this is the tricky part, only one drum will balance easily). You can quickly determine where any heavy sides are.
Drive carefully, and enjoy, W2
I have a setup very much like the photo in Ed's 2nd post above. I used a one inch shaft and cones from a brake lathe. I'm really pleased with how well it works.
This is my Sunstrand - I believe I have mandrels for every part of a Model T that rotates.
Yeah, my Sundstrand is like Steve Tomaso's. They're handled by a different brand now but replacement parts are available.
I have no problem making the knife edge stand. The mandrel shafts and/or cones are what have me held up. Can any one post a picture of the brake lathe cones? I tried to play my Transmission Rebuild DVD tonight to see what Milt used, but the darn disc is messed up about half way through on disc 1... So I can't see the balancing part of the presentation. Having mandrels made at a machine shop would cost too much for such occasional use.
Any more info?
Why not just send them to someone that can balance them and not try to make some half-fast mandrels.
Otherwise, why bother. The mandrels have to be true also.
Being on the east coast, I would send them to j and m along with the triple gears
If your local juco has a machine shop, maybe one of the students would like to get some practical experience making some mandrels for you. Since I took a machine class a couple of years ago the teacher lets me use the equipment occasionally when I need to make something.
Thanks Steve. One of my neighbors is retired and has a lathe. He is making me a set of precision cones to fit a length of 3/4" drill rod. The cones will do both drums. I'll post some pictures when we get done.
Ok, I've been convinced that balancing my drums has merit. So I've arranged to borrow a balancing stand from Erik Barrett but have had a flash of inspiration. Why not make a dynamic balancing machine? So since I have no deadline for reassembling my T engine I will build a dynamic balancer based loosely on Tom Carnegie's brilliant low cost balancing machine.
Utilizing Tom's genius and my frugality and lack of spare model T blocks I've figured how to do the deed. I will be able to balance drums, whole transmission and crankshaft with my version of the Carnegie machine if all works well. If folks are interested I will show my progress on this job.
This makes perfect sense to build a machine to do this work on a car I bought for $5 over 20 years ago. Well perhaps I will buy another model T to justify the investment of scrap metal, floor space, and time in the building of this machine.
Does anyone have a shabby brass touring or TT chassis needing engine rebuild for sale?
Interesting, indeed. Keep us posted.