Tooth Changing Gears

[MrForbes]

Are you talking about the gears that are inside the FP gearbox, that are molded plastic, and have two gears molded together, one with small teeth and one with large teeth?

If so, I don't know of any place where you can buy random sized gears like that, you need to either use some from a gearbox like the FP gearbox, or else connect two different gears together, on a common shaft.

[Nick LaPosta]

Yeah. But I was planning on using the idea for a custom Cim motor gearbox so i dont know if the plastic would hold up. Putting two different gears on the same shaft could work but they would need to be prevented from spinning freely of eachother. Could i use a spare machine key for that?

[MrForbes]

Yes you could use a key, or you could use gears with a hex hole, and a hex shaft to connect them.

Some of these gears have hex broached holes in them

http://www.andymark.com/SS-Gears-s/209.htm

Look around on the AndyMark web site, there is a lot of useful stuff there!

[PAR_WIG1350]

I recommend the AndyMark cluster gears and cluster shafts which are specifically designed to be used to put two gears on one shaft without spacers (be careful, if the parts don't come from the same transmission family, spacers or machining might be necessary to get them to fit on the cluster shaft).
http://www.andymark.com/Hex-Shaft-Gears-s/237.htm
http://www.andymark.com/Shafts-s/266.htm
the super shifter cluster shaft is named as such, but the tough box cluster shaft is simply called the Toughbox Small Hex Shaft.

[Nick LaPosta]

Cool thanks. I have been struggling with the idea for a few days and never thought of this