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View Full Version : pic: Dual CIM Dewalt Transmission

pjco217
30-05-2009, 11:07
[cdm-description=photo]34023[/cdm-description]
sdcantrell56
30-05-2009, 11:08
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.
kramarczyk
30-05-2009, 12:04
Also if you dont mind I would love to get the dewalt CAD model.

There is one available at...
http://www.chiefdelphi.com/forums/showpost.php?p=742919&postcount=4
ddhotli
30-05-2009, 20:18
what do you plan to make the sideplates out of?
pjco217
31-05-2009, 10:00
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.
sdcantrell56
31-05-2009, 10:51
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?
roboticWanderor
31-05-2009, 16:29
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.
CraigHickman
31-05-2009, 18:54
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.

Unless they're symmetrical, in which case it'd be really fast to crank out a bunch of the same part.
roboticWanderor
31-05-2009, 19:21
Unless they're symmetrical, in which case it'd be really fast to crank out a bunch of the same part.

but they are not, one mounts the CIMs and one mounts the DeWalt
CraigHickman
31-05-2009, 19:35
but they are not, one mounts the CIMs and one mounts the DeWalt

And plunging four small holes takes SO much time. :rolleyes:
pjco217
02-06-2009, 19:57
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?

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.
sdcantrell56
02-06-2009, 21:17
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.
marccenter
03-06-2009, 17:05
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.