We are doing some prototyping and want to know if anyone has some thoughts on the cheapest way to adapt a 775RS motor we bought. Since its for prototyping its ok if it breaks under competition like forces.
The 775 motor cannot take any side loading. The simplest way is to use a Vex versa planetary gearbox with no reduction. I imagine the Rev planetary could do the same. It is a little up front cost, but it lets you add reduction if needed and gives good mounting options. It is vary reusable. Not saying the same about the motor which is somewhat fragile.
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To add to this, my first reaction was to suggest the Rev Ultraplanetary, but upon further investigation it appears to not be compatible with 775-class motors.
Costwise, the Vex VP Lite gearbox with 775 mounting plates and extra 1/2" Hex Output (note, you need a pair of snap-ring pliers to replace the default 3/8" hex shaft) is probably the best option ($37.97 before tax/shipping). If you need gear reductions, they can be added relatively inexpensively (~$25 per reduction stage).
On a related note, is it just me or did Vex stop selling their “Lite” ring gears? I can’t seem to find them anymore.
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The light ring gear appear to be out of stock. You could ask Vex CS if they are discontinued.
Thanks all for the quick advice!
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If you are skillful with a drill press, or have a lathe or mill, you could drill a 1/8" hole in a piece of hex shaft and secure it directly onto the 775’s shaft with retaining compound like loctite 638.
If you have a 3D printer and are using the PG27 RS775, which already has a small pinion pressed onto the end, you could print a 1/2" hex sleeve that fits tightly over the pinion.
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