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One end of the gearbox is an adapter that lets it fit the Mini-Ev. The mounting holes on this prototype needed drilling out a little larger to be able
to fit the M5 screws provided as the holes did not align perfectly with those on the motor. Correct alignment of the motor is still maintained as it actually is the large centre hole
that locates around the bearing housing on the motor.. |
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I machined four small cutouts on the side of the adapter that will allow air to enter the openings on the front of the motor. This should greatly improve
motor cooling. Ted Z suggested this on the forum and I think it would make a good improvement to the design of the adapter. As you can see an old drill press and a milling cutter will do
the job but not very neatly! |
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The gearbox is held together using four M3 x 35mm screws and they only have 3mm or so thread where they attach to the Adapter. I'm going to look for some
40mm long ones to increase the engaged threads. |
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The shaft on the motor must be shortened by 3mm and I did this using my trusty Dremel Clone. The nice yellow duct tape keeps filings out of the motor.
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I pressed the gear onto the shaft using my bench vice. I was careful not to overdo it and bend the motor shaft. |
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I then did a trial assembly of the motor and gearbox. Everything fitted together nicely and ran smoothly when attached up to one of my 12v Hawkers. The combo
makes pretty nice package of a good big motor with a neat strong gearbox. it will be interesting to see how it performs in the finished bot. |
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