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Attached are the PDFs of two easy to convert screwdrivers commerically available on the market. they use motors in the 540/550 series, so converting them to legal FIRST easy
Attached are the PDFs of two easy to convert screwdrivers commerically available on the market. I purchases a Milwaukee at Home Depot, and the bare version of the Bosch is available on Amazon for $50 (and its a 2 speed). The Milwaukee I estimate to be at aroudn 40:1 and has anti-backdrive pins. The Bosch is a 2 speed which I estimate to be around 22:1 and 45:1. They use motors in the 540/550 series, so converting them to legal FIRST easymotors just requires pulling and swapping the pinion, and then bypasswing the trigger and connecting to a motor controller. the output is a 1/4" hex which can be used as is, or with a driver, bumped up to 3/8" hex. We have snapped a couple, and I can tell you the 1/4" hex is the weak link.
IKE
Attached Files
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Bosch Schematic
Bosch_CSYS00788093-001.pdf
download file
uploaded: 14-03-2012 17:04
filetype: pdf
filesize: 87.27kb
downloads: 401
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Milwaukee Schematic
Milwaukee_37193_54-42-2400.pdf
download file
uploaded: 14-03-2012 17:04
filetype: pdf
filesize: 163.67kb
downloads: 252
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Milwaukee internal
0220021736b.jpg
download file
uploaded: 15-03-2012 08:22
filetype: jpg
filesize: 104.32kb
downloads: 288
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Milwaukee Internal 2
0220021736c.jpg
download file
uploaded: 15-03-2012 08:22
filetype: jpg
filesize: 182.53kb
downloads: 268
Discussion
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15-03-2012 08:34
IKE
Re: paper: Easy to convert Screw-driver Gear-boxes
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:
05-04-2012 16:07
IKE
Re: paper: Easy to convert Screw-driver Gear-boxes
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.
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