What gear pitch is this?

[What's_nitro?]

Hey guys I recently blew up my power drill SO I've decided to "upgrade" it.

I pulled out the old motor and I need to know what pitch the pinion is. It is a 12 tooth pinion. It's about 1/2 inch in diameter.




Any ideas? I'm sure it isn't that uncommon. I was thinking 32P?

[What's_nitro?]

Oh and just in case you're wondering why I don't just remove this pinion, it's because it is one with the motor shaft.

[BrianG]

Well, Mod1 would be 0.55" (14mm) in diameter, and 32p would be 0.44" (11.2mm) in diameter. You'll probably have to be a little more exact than "about 1/2".

I looked at one of my Mod 1 pinions and it doesnt have the triangular shape at the end the one you have pictured, I couldnt find any of my 32 pitch pinions but I am thinking that the gear is not one that is common to RC...just a guess though

[BrianG]

The shape doesn't really matter with regards to the pitch. Clutchbells and Mike's older steel (non hardened) pinions were differently shaped, yet both were Mod1.

Originally Posted by BrianG

The shape doesn't really matter with regards to the pitch. Clutchbells and Mike's older steel (non hardened) pinions were differently shaped, yet both were Mod1.

I stand corrected....

[What's_nitro?]

Errr, if only I had a caliper to get a more accurate measurement. I can tell you that the teeth are much smaller than M1 gears. Also much larger than 48P. I don't have any 32P in my collection to compare it to. It's from a Craftsman drill if that helps at all...

[JERRY2KONE]

That gear has to be pressed on the rotor shaft. I seriously doubt that they made a rotor shaft and milled a pinion on the same piece of metal. You may have to apply a little heat to the gear to get it off. Wish you luck with that project.

[BrianG]

A caliper would be more accurate, but since you don't have one, you can use a metric ruler instead. If the pitch is smaller than Mod1, but larger than 48p, it's probably is 32p. Take the motor to your LHS and see if it will mesh up with other 32p gears.

[JERRY2KONE]

If you like you can check out VXB.COM where I get my bearings from. If you place an order for some bearings they will throw in a digital caliper for $9. I have one on the way now so I will let you know how that pans out.

[What's_nitro?]

Originally Posted by BrianG

Take the motor to your LHS and see if it will mesh up with other 32p gears.

I don't have a LHS... I'll just order a 32P pinion. I'm now about 90% sure that that is the correct pitch. It is just short of 12mm tip-to-tip. Thanks guys. I'll start a thread on the project if it goes well.

[What's_nitro?]

Originally Posted by JERRY2KONE

That gear has to be pressed on the rotor shaft. I seriously doubt that they made a rotor shaft and milled a pinion on the same piece of metal. You may have to apply a little heat to the gear to get it off. Wish you luck with that project.

Umm Jerry, not to rub it in your face or anything, but here's a picture of the extracted rotor. It just goes to show that they really don't make 'em like they used too...