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Re: Andymark/Vex Dog Gears Interchangeable?
To make sure that spur gears mesh you nominally need to match the diametral pitch (DP) and pressure angle are the same. To replace gears 1-for-1 the tooth count must also match. I assume this is what you're really interested in. Most of the common AM & VexPro gears are 20DP and 14.5deg pressure angle, so the teeth should mesh just fine.
Dog gears are something else entirely, they are the mechanism that 'shifts' in your normal AM shifter transmission. A VexPro shifter transmission uses a 'ball shifter' mechanism that functions in a slightly different manor from a dog gear.
Dog gear.
Spur gear with dog gear on the side.
Spur gear.
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