pic: Mammoth GearBox1

[Ken Patton]

Theres some good advice on this thread, hope you are seriously considering what they said, rc_cola.

One item not yet covered - if you are going to use a sprocket on the output shaft to drive a chain drive, you should think about the shaft loads that will result from the chain when the motors are at full load and the wheels are stalled. The chain load can be pretty high for a drive with this output torque.

One other thing you might consider - the standoffs that you are using there look pretty skinny. Along with making sure you have adequate strength of the sideplates (as Greg already said), I would make sure you have enough contact area between the standoffs and the side plates.

Ken

[R.C.]

Thanks for all the suggestions:

-Pocketing the gearboxes was because we wanted to try out the CNC and with Cosmos it tells us that the plates are plenty strong enough. They are 7068 plates at 1/4 inch. So the plates are just for fun.

-The mentors were going over the specs and said that the 3 inch cims would be better for a 2 stage reduction.

Thanks everyone.

[Tristan Lall]

Originally Posted by rc_cola1323

Thanks for all the suggestions:

-Pocketing the gearboxes was because we wanted to try out the CNC and with Cosmos it tells us that the plates are plenty strong enough. They are 7068 plates at 1/4 inch. So the plates are just for fun.

-The mentors were going over the specs and said that the 3 inch cims would be better for a 2 stage reduction.

Thanks everyone.

7068? You're just playing with fun materials, rather than trying to economize, right?

And as for the big CIMs, all things being equal, it's probably sensible to get rid of those somehow.

[=Martin=Taylor=]

I suppose you really want to make a gearbox... because a tough box with spacers weighs only 1.77 lbs...


How big is the mammoth? Will you be mechanizing the head? If you do, post some pics, since that sounds really cool!

[Andy Baker]

Originally Posted by Hachiban VIII

I suppose you really want to make a gearbox... because a tough box with spacers weighs only 1.77 lbs...

... and if you swap out the steel 50 tooth cluster gear for the aluminum 50 tooth cluster gear, you can save another 0.31 lbs.

Andy B.

[Travis Covington]

Originally Posted by Andy Baker

... and if you swap out the steel 50 tooth cluster gear for the aluminum 50 tooth cluster gear, you can save another 0.31 lbs.

Andy B.

What a sneaky guy we have here...

Edit: Looks promising. How's the 6061 holding up?

[R.C.]

Originally Posted by Tristan Lall

7068? You're just playing with fun materials, rather than trying to economize, right?

And as for the big CIMs, all things being equal, it's probably sensible to get rid of those somehow.

The 7068 is coming as a donation from one of our near by metalshops and i'll try to get rid of the big cims.

Originally Posted by Hachiban VIII

I suppose you really want to make a gearbox... because a tough box with spacers weighs only 1.77 lbs...


How big is the mammoth? Will you be mechanizing the head? If you do, post some pics, since that sounds really cool!

Yeah, we kinda wanna CNC some stuff and i'll put pics up tomorrow. The mammoth is huge and the head will be moving.

Originally Posted by Andy Baker

... and if you swap out the steel 50 tooth cluster gear for the aluminum 50 tooth cluster gear, you can save another 0.31 lbs.

Andy B.

Thanks Andy, Make sure to do that.

[vivek16]

Originally Posted by Andy Baker

... and if you swap out the steel 50 tooth cluster gear for the aluminum 50 tooth cluster gear, you can save another 0.31 lbs.

Andy B.

Well it's about time AM offered Aluminum gears! Can't wait to see how these perform.

thanks, Vivek

[R.C.]

Man time does fly, I'll put up some pics of the actual mammoth on tuesday or monday depending on when i can get them.

Here's some the prototyped plates in plastic and prototyped wheel for next year and for the mammoth.