Possibly useful - 33:1 gearbox

[Jeremiah Johnson]

Wow... although I've never thought of Harbor Freight to sell durable products. My hammer from the dollar store lasted longer than the one that I got from Harbor Freight.

Although a 33:1 ratio is kinda out there, it would work very nice to raise an arm.

Edit: The ratio to raise and lower my Vex robot arm is 7:1 and it moves extremely slow. So I wonder how slow that ratio would be, but then again it depends on the motor you attach it to. And then you could put it to be 1:33. Super fast. Not extremely useful in FIRST but maybe in a combat robot. LOL.

[colin340]

Originally Posted by Budda648

Wow... although I've never thought of Harbor Freight to sell durable products. My hammer from the dollar store lasted longer than the one that I got from Harbor Freight.

Although a 33:1 ratio is kinda out there, it would work very nice to raise an arm.

Edit: The ratio to raise and lower my Vex robot arm is 7:1 and it moves extremely slow. So I wonder how slow that ratio would be, but then again it depends on the motor you attach it to. And then you could put it to be 1:33. Super fast. Not extremely useful in FIRST but maybe in a combat robot. LOL.

yes but the vex motors are gear motors and have a very big reduction in the case of the motors, yes hf is bad unsealed bearings in a water pump

[Andrew Blair]

33:1 on a CIM is about 2.5 rev/sec. Perfect for an arm if you add in a small reduction before hand. But it would seem like a big modification perhaps.

Originally Posted by Budda648

Wow... although I've never thought of Harbor Freight to sell durable products. My hammer from the dollar store lasted longer than the one that I got from Harbor Freight.

Although a 33:1 ratio is kinda out there, it would work very nice to raise an arm.

Edit: The ratio to raise and lower my Vex robot arm is 7:1 and it moves extremely slow. So I wonder how slow that ratio would be, but then again it depends on the motor you attach it to. And then you could put it to be 1:33. Super fast. Not extremely useful in FIRST but maybe in a combat robot. LOL.

[Dick Linn]

You might be able to use it without reduction by using some sort of cam arrangement - depends on how much you want to raise it.

I did see the exploded parts diagram of this. There's an internally toothed annular gear around the outside, and what appears to be two inner gears with some eccentric shaft. It's hard to see from the drawing just what is going on.

[sanddrag]

Even better. $14.99 http://www.harborfreight.com/cpi/ema.../images/17.jpg

Supposedly the coupon is good Sept 15-21

[Andrew Blair]

Originally Posted by sanddrag

Even better. $14.99 http://www.harborfreight.com/cpi/ema.../images/17.jpg

Supposedly the coupon is good Sept 15-21

Is that only good in Pittsburgh? I just noticed the label in the top corner.



<EDIT> Wow, I feel dumb.</EDIT>

[Dick Linn]

There's a picture and more discussion here: http://www.chiefdelphi.com/forums/sh...ad.php?t=49073

[Richard Wallace]

Originally Posted by Dick Linn

There's a picture and more discussion here: http://www.chiefdelphi.com/forums/sh...ad.php?t=49073

Also here: http://www.chiefdelphi.com/forums/sh...ad.php?t=49064

One thread is about the innards of the torque multiplier, another is about a possible application.