pic: Simple Chain-in-Tube Concept

[billbo911]

Originally Posted by Aren Siekmeier

The drive shaft on the middle wheel, along with the gear on that shaft, remains in the tube when the transmission is removed. The interface between the removable transmission and the frame consists of the mounting bolts and the gear interface.

Right, forgot about the third stage! That make perfect sense. OK, supper easy assembly and repair them, got it.

[waialua359]

I cant believe I missed this thread earlier. We may look into this.
Even with the relatively small amount of space saved, makes a big difference on the footprint of the control system parts on the bellypan.
With a modulated frame that we are using, this is even easier to access our chain.

[Ty Tremblay]

Realized I've been having a 7 month long brain fart.

If you increase the spacing of the output gear from the rail by .25", you can bolt on 1"x1"x.125" tubing and use that to mount your gearbox. VexPro sells .25" acetal spacers with a .5" hex broach.

Top-down view

[RyanCahoon]

Originally Posted by Ty Tremblay

you can bolt on 1"x1"x.125" tubing

Top-down view

How difficult will it be to install those gearbox mount bolts?

[Aren Siekmeier]

Originally Posted by Ty Tremblay

Realized I've been having a 7 month long brain fart.

If you increase the spacing of the output gear from the rail by .25", you can bolt on 1"x1"x.125" tubing and use that to mount your gearbox. VexPro sells .25" acetal spacers with a .5" hex broach.

Top-down view

I thought your original version that started this thread was basically this with a 1"x0.75" tube for the gearbox mount...

[Ty Tremblay]

Originally Posted by Aren Siekmeier

I thought your original version that started this thread was basically this with a 1"x0.75" tube for the gearbox mount...

If you can easily find 1x.75 tubing, then that's a great way to go. It's not easily acquirable for our team, so we'll be milling down a piece of 1x1 and welding it on.

[Ty Tremblay]

Originally Posted by RyanCahoon

How difficult will it be to install those gearbox mount bolts?

The bolts holding the gearbox to the 1x1 tubing? Very easy.

If you're talking about the bolts/screws used to attach the tubing to the drive rail, it's just a matter of lining up the holes and getting a bit started on the other side. I'd suggest doing it before installing any wheels, bearings, or chain.

I'm about to hop on a plane, I'll get a couple more screen shots and the updated CAD as soon as I can.

[Aren Siekmeier]

Originally Posted by Ty Tremblay

If you can easily find 1x.75 tubing, then that's a great way to go. It's not easily acquirable for our team, so we'll be milling down a piece of 1x1 and welding it on.

Or .75x.75, or .75 x 1.5, or something... but ok.