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Hi Andrew,

By going with the 2 different angles you can get the gears almost the same outside diameter but you will still need twice as many teeth on one as the other.

Attached is my drawing for the gears I made for a tiny side shaft hit and miss engine. The pitch is tiny but if you look at the gears and information that will give you a better idea of what you are looking. at. Using the spreadsheet that Don1966 published all you have to do is plug in you diametral pitch, tooth count and helical angles and it will give you all the information you need.

By going with the 2 different angles you can get the gears almost the same outside diameter but you will still need twice as many teeth on one as the other.

Attached is my drawing for the gears I made for a tiny side shaft hit and miss engine. The pitch is tiny but if you look at the gears and information that will give you a better idea of what you are looking. at. Using the spreadsheet that Don1966 published all you have to do is plug in you diametral pitch, tooth count and helical angles and it will give you all the information you need.