paper: Easy to convert Screw-driver Gear-boxes

[IKE]

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Easy to convert Screw-driver Gear-boxes by IKE

Attached are some schematics for Bosch and Milwaukee screwdrivers which are very easy conversions for 550 motors. Both of these units have locking pins if you need a lightweight, high torque unit with anti-back drive capability.

[IKE]

I have added a couple of internal shots of the Milwaukee we are using with the FRC2012 legal motor and leads shown (thanks Jim).

We decided to use this unit in place of our original drive system which was a DEWALT XRP with a 775. Note that 775 is a very easy replacement/isntallation into the XRP as it has the same shaft as the original DEWALT motor.

The Milwaukee with 550 is considerably lighter than the XRP 775 combo. If memory serves me correct, the XRP/775 was right at 3 lbs where as the Milwaukee/550 was right around 1.5 lbs. This was discovered due to a weight crunch issue right before "Bag Day".

Here is a link to the "bare" version of the Bosch unit on amazon

This is a great little unit that is relatively cheap. For 50$ you have a lightweight 2-speed gearbox with internal anti-backdrive pins.

For all of these conversions, you will need a pinion puller like this one:

[IKE]

I just got word that be careful trying to press a FP into the pinion coming out of the Bosch unit. Although it is an RS550 motor in the unit, I was told that trying to press the pinion on a FP motor has resulted in broken pinions. My guess is these pinions are powdered metal and heating them up before pressing might help get a fit that won't brake them (this is a guess and has not yet meen tested).

Hopefully someday in the future we can just use a unit like this without having to swap the motor.