Bit/MS Diff idea

[frizzen]

Better bits. An obvious thing is to make a differential instead of the solid axle for better control, but that would mean making a whole new back section and grafting it onto a Bit chassis. (Chopped Bit or MotorWorks chassis using ZZ bodies for more room to work with perhaps?)

My first thought was Tyco TCR slotcar rear. (The moving front wheel chassis, not the Jam Car) But when I got one out of my boxes of slotcars, I found out that the "Y-shaped spur gears thingey" wouldn't quite work as intended. (only drives 1 wheel) BUT if you were to move the gears to 180 degee relationship, lock the Y-thing from rotating, put the circular drive gear back on top, and somehow find room to mount the motor back in, it *could* work as a diff!

It would be a hack-job though. I'm going to keep thinking, and try to find my box with the various watch gears. I think I can make an open differential for it and have it perform great. Or I'll make something completely custom under a stock body and goes about the same speed as stock, but with much more engineering.

[MicroSpeed]

All I do is twist the wheel as if you were going to take it off until it will turn about 1/2 an cm. just don't twist it to much (learned the hard way) or your wheel will fall off.
David is not responsible for any broken wheels when using this method, as you do this mod at your axles own risk. if you wheel does fall off, simply apply a dot of CA glue to the axle and push it back into the wheel. allow to dry for 30min-1hr

Thats problably not the best method for a differential but it works for me.

David

[TypeZer0]

Originally posted by MicroSpeed
All I do is twist the wheel as if you were going to take it off until it will turn about 1/2 an cm. just don't twist it to much (learned the hard way) or your wheel will fall off.
David is not responsible for any broken wheels when using this method, as you do this mod at your axles own risk. if you wheel does fall off, simply apply a dot of CA glue to the axle and push it back into the wheel. allow to dry for 30min-1hr

Thats problably not the best method for a differential but it works for me.

David

that's not exactly a differential. that happened one time on my first bit, i drove it so hard the right rear wheel got loose on the rear axle so i got wide left turns and tight right turns and it always tended to go to the right since the left rear wheel is powering the car.

frizzen, you keep at it and keep us posted on your idea and remember, PICS!!! =)

[frizzen]

TypeZer0,

I'm still running it through mental testing trying to improve the design and work out issues. Once I get past that, I'll start looking for my watch gears. If I ever get a proof of concept model made, this board will be the first to know.

My source for watch gears went out long ago, but I'm sure there are others you can find. One of the craft shops around here sold those in their *jewlery* making section until it went out of business. (See, it pays to know where they keep everything in all the craft or hobby stores you can find!)

[MicroSpeed]

well it was worth a try

The question on this one is:

Can it be made light enough so as to give the performance advantage without a weight penalty to cancel it out?

[frizzen]

strider,

Honestly I really doubt it. And it's not like these things tend to get enough traction to *actually need* the diff.

I'd be doing it more for the cool factor than the actual performance increase. Unless you had a perfectly clean high-grip track and were running really sticky tires, I doubt it would affect their performance much. It would probably need a Motorworks car or a transistorized multi-battery chassis to make up for the weight, additional drivetrain friction, and greater inertial mass.

If it's not worth it on a bit, this may end up with a lower gear ratio on a TTTT that I'll make when I have the cash for electronics.

No doubt it will look killer! (As prototypes so often do)