GearHeads Forum

Yes - you are on the right wavelength! The fellow working on this project did just that - and DID find the gear on an RC supplies site.

The rub was - it was a 'pot-metal' gear, and wouldn't stand up to the hard use of the wind-speed indicator. And so I'm hoping to be able to make a 4 or 5 inch ...

Ken - thanks for the info. Acutally - I DO have that book! I was hoping to avoid the process of making the cutter - my plate is already pretty full. Taking the time to go into creating, hardening, etc, while a wondeful learning experience would just delay me even more.

I'll have to review the book ...

Greetings to all!

I've been asked to make a small gear to be used in a wind speed indicator. This is on the Battleship New Jersey museum-ship, and apparently the size is a bit odd and hard to find.

What I know: The OD of the gear is 9/16", it has a 64 pitch and 35 teeth. I do not have the center ...

Did a bit of searching and have found low priced motors with 50:1 gearboxes!
Since I'd never have much of a load, these transmissions, tied to my stepper, would give the range you suggest.  Jogging would be painful, unless there was a way to switch out the gearbox...  More food for thought!

A.

Ok - guess I'm still a bit off base... I hear your advice regarding the higher resolution. I think I got side-tracked into thinking about degrees, etc.

So in your first reply you commented that a 10:1 stepping ratio would be good - which I took to mean I'd end up with 2000 steps for the total 200 ...

Ok - so if I go with a step-up ratio of 10:1, I now have 2000 steps per 360 or per revolution.
So if I want to cut a gear with say.... 28 teeth, I would divide 2000/28 = 71.428 - and use 72 steps as it would be 'close enough' on small diameters?

About the biggest diameter I could do is about 6" or ...

Greetings to all! My first post on this forum - looking for a little math and precision info.

I'm building an Arduino-based control for a stepper motor to cut clock and other type gears on my milling machine.
The stepper I have is a 200-step-per-rev or 1.8 deg per step motor. To simplify my design ...