PDA

View Full Version : Looking to get a custom gear made



Jim Caudill
12-08-2016, 10:23 AM
I have an antique Salsbury Scooter that was made in the late 40's. The kick-starter has sort of a floating sector gear on it, and this turns a small gear on the crankshaft. The crank gear resembles a spur gear that has 16 teeth and a DP of 10. Now, the "kicker" (pun intended) is that the teeth are asymmetrical: they have a normal tooth profile as the sector gear is driving turning the crank, but then has a sloped ramp on the other side of the tooth that will bump the sector away and prevent engagement once the crank is turning faster than the sector. The gear is about 1.75" overall diameter and 3/4" thick with a 1.133 bore (for the crankshaft).

I have ordered a Boston Gear stock spur gear (NF16B) to see if I can modify the tooth profile, but I don't know if that is the best path to follow. This is a low use, intermittent engagement type of thing, so the exact tooth profile is probably not super critical. I can't upload to photobucket right now, but I'll try to add a picture later.

I might like to get a handful of these made for other members of our club.

Any ideas?
https://scontent-lga3-1.xx.fbcdn.net/v/t31.0-8/15443288_1776725975911189_3803823878663833828_o.jp g?oh=80a71397c052686dec9fe9977439434f&oe=58B4D9A9

Zahnrad Kopf
12-08-2016, 11:07 AM
Fairly experienced with Asymmetrical Tooth Forms. I'll make you an offer to help out in a PM.