If you just need the gears that will stand up......The big circle track

quick

change gear set cost less than $100.00 per set, new and will stand up to
anything. The shafts are cheap also.

Lynn E Hanover
lehanover@aol.com

They are racing parts Lynn and are unlikely to get more than 100 hours of

use

in their entire lives. A five hundred mile race takes less than three

hours.

Fatigue of the gear face is a major consideration. As I recall the ratio
range is very limited as well so you probably will need three.

Jeff Spitzer wrote:

I too recall the highest ratio for change gears being about 2:1.  I'm not
sure what Paul meant by need three.   I'm sure he knows that if they are all
on the same plane then only the first and last sizes matter.  If you want
more ratio from 2:1 gears you'll need 2 meshes with two on one shaft (one
large driven and one small driving) and that would require 4 gears total.

Jeff Spitzer

Duh! You are right Jeff. There is a reason people use three gears but it
escapes me at the moment. Perhaps to get the large off set and keep the 
size and weight of the box down.

Paul Lamar
 
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