[chrisguyw]

To calculate the "perfect" tooth count for  any fixed dia. 5. module pitch. gear (pinions/spurs) ...do this

Take the gear dia. and multiply by 2.......subtract 2 from this total

Eg, (A 6.5mm pinion)...........6.5 x 2 = 13.....subtract 2  = 11........."perfect" tooth count (closest to .5 module)  for a 6.5mm .5 module pinion is 11T.

In my experience you can deviate about 10% either way  from "perfect" on any gear without issue......so.... for a 6.5mm pinion (11T "perfect"),...you can use either a 10T or a 12T.......any more/less and there are mesh issues.

Cheers
Chris Walker

Hello Chris
That's a perfect quote/formula to use in the SRO slot car Manual..can we?

With kind regards
Tamar

Tamar, I am sure we can work out some reasonable "royalty" payment  ...........In the interim. be my guest !!

Cheers
Chris Walker