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Step 5Hack Drill Motors
See how-to link below for removing motors from electric drills. For this application I used an O-ring, rather than set-screws, to lock up the gear box torque limiter because it was cheap and simple.
http://www.wa4dsy.net/robot/drill-motor-hack
Two additional modifications are required to the front “double D” black plastic section of the drill. First using Dremel tool or file remove semicircular rib at the top of one of the “double D” the sections. Second using Dremel tool or round file, cut 2 semicircular grooves on either side of “double D” section to accommodate the mounting bolts, see photos.
For the jaw opening mechanism motor you’ll need to reattach the drill chuck.
For the neck motor reattach the black cover disk. Use two #4 washers to move the disk from the end of the motor a little bit, see photos. Thread a 3/8-24 hex nut onto the motor drive shaft followed by driving link [part J], and lastly use a small washer and reverse thread screw to complete the attachment of the driving link to the motor shaft.
Modify the drill motor battery pack. Separate battery pack halves and with a multi-meter find the battery connecting strap providing +12 VDC output. Solder a 6 inch wire to this strap and cut a slot in battery housing to route the wire out.
I used a motorcycle type bullet nose quick-connect at the end of the 6 inch wire, but a 3/16 spade quick-disconnects are more readily available. See photos.
Save the battery pack horseshoe shaped electrical connector.
http://www.wa4dsy.net/robot/drill-motor-hack
Two additional modifications are required to the front “double D” black plastic section of the drill. First using Dremel tool or file remove semicircular rib at the top of one of the “double D” the sections. Second using Dremel tool or round file, cut 2 semicircular grooves on either side of “double D” section to accommodate the mounting bolts, see photos.
For the jaw opening mechanism motor you’ll need to reattach the drill chuck.
For the neck motor reattach the black cover disk. Use two #4 washers to move the disk from the end of the motor a little bit, see photos. Thread a 3/8-24 hex nut onto the motor drive shaft followed by driving link [part J], and lastly use a small washer and reverse thread screw to complete the attachment of the driving link to the motor shaft.
Modify the drill motor battery pack. Separate battery pack halves and with a multi-meter find the battery connecting strap providing +12 VDC output. Solder a 6 inch wire to this strap and cut a slot in battery housing to route the wire out.
I used a motorcycle type bullet nose quick-connect at the end of the 6 inch wire, but a 3/16 spade quick-disconnects are more readily available. See photos.
Save the battery pack horseshoe shaped electrical connector.
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