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Originally Posted by jakep
Hey Kevin, WOW thanks for that awesome spreadsheet! And it's got those numbers and specifications we all love!
For those Dewalt motors/gearboxes:
What do you mean by "the parts you'll need will run you from $100-$150 per motor. Depending on how much case you want around it." ?
I was looking at the ServiceNet link you gave me, the "motor pack" part number is 389010-00 and the transmission part number is 388974-00. Buying one of each costs around $90. For our project, we have a protective aluminum shield around the underside of our robot. (Where the motors, electronics, batteries, etc. are mounted) So, I don't think we need much case around the motors/transmission. Would we be set if we just bought the motor pack and transmission?
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Have you looked at the
Nothing But Dewalts white paper? You can see a bit of how complicated these Dewalt trannies can be. I suspect you need more than just the motor and tranny to make that work. Specifically, I think you need some of the plastic case parts to screw things into and other parts to hook up a shaft to.
So, I think you also need parts 17, 18, 19, 38, and maybe 24. 18, the gear case, would hold everything together. 38 is a nice round-ish spindle to use for a shaft. 17 and 19 almost certainly engage the spindle with what's probably an odd looking asymmetrical output on the tranny itself. 24 is a spring that probably helps the clutch work, but you can probably simply weld/glue and 19 together instead.
EDIT: oh. and 29. A nice left-hand screw to go into the spindle. And 22,to hold the spindle in. So all that works out to $125. I'd personally want the case as well to give it more support and some of the screws for it. That works out to $154 or so.