This forum my last hope?

[tommyheadleycox]

[QUOTE=tommyheadleycox;392060]Greetings, one and all,

I'm posting here because the folks seem genuinely helpful. I need a pinion gear. It's not for a truck but a Maxon coreless motor to go in a big German train I have. I've done a lot of research, but haven't found a match. I'm hoping that someone here might tell me how to proceed. Here's the info about the needed gear:

10 tooth
2 mm bore
7 mm outside diameter (might have once been 7.5- it's now worn.)
5 mm inside diameter (base of teeth)
5 mm length

Update: Please excuse me if this is a duplicate message. I found a source in England that has a 10 tooth, module 0.6, 2 mm bore pinion gear. I also talked with SDP. They did not they had this gear in stock. So I'll try out the gear from England.

I did find some gears that were close. But the fewest number of teeth was 12, not 10. Question: Am I correct in assuming that I can switch from 10T to 12T, as long as I stay with the same module? I understand this will affect top end speed and put more power demand on the motor, but that's not an issue. I just need to achive proper gear mesh.

Last question: Does anyone know if there exists a module between 0.5 and 0.6? I ask because my measurements and scriptasylum tell me the pinion and spur gears are 0.58 module.

Thanks again for all your help.

Tom

[BrianG]

Originally Posted by tommyheadleycox

...Last question: Does anyone know if there exists a module between 0.5 and 0.6? I ask because my measurements and scriptasylum tell me the pinion and spur gears are 0.58 module...

We run Mod0.8 and 32p (31.75p) all the time without issues, and that's a pitch difference of 0.25. Using a mod 0.6 for 0.58 is a pitch difference of 0.02.

Have you considered replacing the spur and pinion as a matched set? You might be able to modify the existing spur mount to fit something much more common. Just a thought...