Motors need help finding a pinion

C

cobieg

Member
Ok, so I am working on a project that I am changing from brushed to brushless motor. The problem is, the shaft on the new motor is 3.5m. I need a pinion with 14t. I bought one today, but it dosnt mesh with the main. Is this because the new gear is bigger diameter ( 7.85mm old is 6.25mm ) ? How do I find the right pinoin ?
 
You need to find out the tooth gauge of the original pinion and main gear. As they can be different.
 
Actually what Lee is referring to is the "pitch" of the teeth. If I remember correctly, they are a 48 pitch gear. Most all helicopters use the same pitch pinion/main tooth.
 
That is the one I bought today, and it dosnt mesh. The main gear is 72mm 180t. I guess I could try to drill the old one out to fit, but have no way to hold it on the shaft.
 
I found a pinion at tower hobby for a brushless upgrade, part # HMXE8021, but it appears the hole is still too small, and it is a press on type as well.
 
You going to be better off leaving it stock. You want an upgradable heli just buy one. Those Cheepos aren't ment to be upgraded. Fly, crash, and throw away! Lol
 
Just something to tinker with. The Trex 459 Sport V2 is awsome, but this kinda stuff keeps my mind and hands going or I will go nuts ! I'll come up with something if I have to drill it small and press it on.
 
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