30-05-2009 11:08

sdcantrell56

Re: pic: Dual CIM Dewalt Transmission

This looks very nice. I particularly like the enclosed gearbox and the lack of standoffs. That should make it much easier to assemble and keep debris out. It would be great to see another render of the inner workings and maybe how you plan to interface the shaft to the dewalt. Also if you dont mind I would love to get the dewalt CAD model.

30-05-2009 12:04

kramarczyk

Re: pic: Dual CIM Dewalt Transmission

There is one available at...
http://www.chiefdelphi.com/forums/sh...19&postcount=4

30-05-2009 20:18

ddhotli

Re: pic: Dual CIM Dewalt Transmission

what do you plan to make the sideplates out of?

31-05-2009 10:00

pjco217

Re: pic: Dual CIM Dewalt Transmission

thanks for the comments
I plan on making more renderings to show how the gears and dewalt interface
im still in the designing process right now though.
And i am making the side plates out of 3/8 thick Aluminum and CNC milling them to specs.

31-05-2009 10:51

sdcantrell56

Re: pic: Dual CIM Dewalt Transmission

What are you planning on doing for the output? Will you be putting a sprocket on the dewalt or having a custom shaft made to direct drive a wheel or something?

31-05-2009 16:29

roboticWanderor

Re: pic: Dual CIM Dewalt Transmission

from a manufacturing standpoint, it might be easier to have to have the sidewalls of the gearbox all one part, so you save all that pocketing/ material removal for one part, and the other side can be a simple flat plate.

31-05-2009 18:54

Re: pic: Dual CIM Dewalt Transmission

Unless they're symmetrical, in which case it'd be really fast to crank out a bunch of the same part.

31-05-2009 19:21

roboticWanderor

Re: pic: Dual CIM Dewalt Transmission

but they are not, one mounts the CIMs and one mounts the DeWalt

31-05-2009 19:35

Re: pic: Dual CIM Dewalt Transmission

And plunging four small holes takes SO much time.

02-06-2009 19:57

pjco217

Re: pic: Dual CIM Dewalt Transmission

For the past two years now we have been direct driving wheels. We modify a Hub and make it so that it is tapped. We then screw that hub onto the output shaft of the dewalt. Then we bolt the hub onto a wheel. We then have a sprocket on the other side of the wheel to chain drive other wheels.

02-06-2009 21:17

sdcantrell56

Re: pic: Dual CIM Dewalt Transmission

Be careful with direct driving a wheel with 2 cims. The shock loading on the shaft as the wheels change direction can break the shaft so be sure to test this set up before committing your season to it.

03-06-2009 17:05

marccenter

Re: pic: Dual CIM Dewalt Transmission

Good mechanical design principles should always be followed before using software to fix mechanical issues. Having issued that disclaimer, A little software filtering goes a long way to help prevent braking shafts. Have your software folks program your robot with a rate-limiter function on the joystick to PWM output relationship function and broken shafts should become a thing of the past.