Tetrix Gearbox Help
 

So today I finally got a chance to take apart the Tetrix gearbox after finding out that it wasn't and integral part of the motor...:o and to my surprise it wasn't a bunch of planetary gears like i thought but a bunch or spur gears. I tried and failed to rearrange the gears and/or remove a gear and it didn't work out. I was wondering how other teams were handling the gearboxes on there tetrix motors?

Re: Tetrix Gearbox Help
 

I'd also like to know. Plus can anyone show a diagram of a setup where the output will be the same/near the input?

Re: Tetrix Gearbox Help
 

The motor will probably need to be geared down a bit, so it would be even better if it was possible to mod the gear box to about a 1:20 ratio (vs the 1:52 it is originally, right?).

Re: Tetrix Gearbox Help
 

Have you seen this? http://www.chiefdelphi.com/forums/sh...&postcount=142

Re: Tetrix Gearbox Help
 

Thanks a lot. I haven't really gone through that thread because of the sheer number of post. I guess I'll have to buckle down and start reading.::rtm::

Re: Tetrix Gearbox Help
 

:D The Tetrix gearbox can be easily changed from 52:1 (as received) to either 31.2:1 or10.4:1.
When you take off the gearbox end plate by carefully grinding, using a dremel, the 3 tabs you will notice 3 compound gear sets each on a separate shaft. 2 are identical.
If you connect (stack) the 2 identical gearsets by lets say by soldering them you will find that by some axial endplay adjustement these will fit nicely and you will have a 31.2:1 gearbox. You may need to push the motor drive gear onto the motor shaft and even grind down its length a little bit.
To get a 10.4:1 reduction stack and attach one of the intermediate gearsets with the input and with even less axial adjustment you will have a 10.4:1 reduction.
The motors can drive a 4 inch wheel with 31.2:1 reduction and with light enough bot you can climb in ~ 2.5 seconds.
I calculate that with 10.4:1 and 2 inch wheels you can climb under 2 seconds.

Re: Tetrix Gearbox Help
 

The Tetrix gearbox can be easily changed from 52:1 (as received) to either 31.2:1 or10.4:1.
When you take off the gearbox end plate by carefully grinding, using a dremel, the 3 tabs you will notice 3 compound gear sets each on a separate shaft. 2 are identical.
If you connect (stack) the 2 identical gearsets by lets say by soldering them you will find that by some axial endplay adjustement these will fit nicely and you will have a 31.2:1 gearbox. You may need to push the motor drive gear onto the motor shaft and even grind down its length a little bit.
To get a 10.4:1 reduction stack and attach one of the intermediate gearsets with the input and with even less axial adjustment you will have a 10.4:1 reduction.
The motors can each drive a 4 inch wheel with 31.2:1 reduction and with light enough bot you can climb in ~ 2.5 seconds.
I calculate that with 10.4:1 and 2 inch wheels you can climb under 2 seconds.

Re: Tetrix Gearbox Help
 

Throw the gearboxes away. They're terrible.

Re: Tetrix Gearbox Help
 

and then do what? :confused:

Re: Tetrix Gearbox Help
 

Let the motor loose.

Re: Tetrix Gearbox Help
 

Or to be more specific, use a smaller wheel as your gear down stage.

Re: Tetrix Gearbox Help
 

I wouldn't call it a "wheel" anymore.

And that's all the hints I'm giving.

Optionally, if you want to use a wheel, you can take the transmission and knock several stages out. Keep just the final 40 tooth gear and the brass gear stage. It's pretty easy to make them line up and mesh.

Even the simple addition of grease will make your gearboxes better.

Re: Tetrix Gearbox Help
 

We tried soldering two of the gearsets together, but we couldn't get the solder to stick. Tried 60/40 rosin core and silver bearing acid core. Do you need to use a special flux or do some special surface prep to be able to solder them together?