12VDC Right-angle gear head motor with worm drive. Available in left hand too.http://www.mpja.com/12VDC-78RPM-Motor-with-Right-Angle-Leadscrew/productinfo/19007+MD/
http://www.allelectronics.com/make-a-store/item/DCM-563/12VDC-RIGHT-ANGLE-GEAR-HEAD-MOTOR-WITH-WORM-DRIVE/1.html
Specs
- No-load rating: 180 RPM @ 12Vdc / 1.3A. Overall length, 144mm (5.66").
- Motor diameter, 49mm (1.91").
- 12mm diameter worm shaft is 89mm (3.55") long. The last 12mm of the shaft has a 6 x 1.0 reverse metric thread.
- Heavy gauge U-bracket on back of gearhead, 1/4" holes with 7mm spacing. 3/16" quick-connect terminals.
- Designed for power seat adjustment in automobiles. Also available with worm gear in opposite direction, CAT# DCM-697.
Price for ten - $17.95 each Shipping for 10 - $7.00
PROS -
Quiet High Torque
Seller has good shipping policy
Good customer service
Seems happy in low torque continuous use
Electrical connection is relatively easy to get to. Will accept slightly modified push on crimp connectors
This motor had enough torque to spin the 8oz test wieght at high rpm without strain.
CONs -
long output shaft with unusual thread. Acme thread nuts are expensive (~$7.00 each)
Buzzes when used with PWM (Pulse Width Modulation) controller. More on PWM in a later post.
Shaft is hardened. making it difficult to cut or drill
Electrical connections can be in the same plane as the right angle crank
Modifications -
I cut away the plastic cover for the electrical connections by using a small hacksaw parallel to the body of the motor. This made accessing the terminals easier but is not really necessary.The output shaft was cut down using an abrasive cutting wheel and a Dremel tool. I used a small U-bolt to attach the crank arm. I'd also grind a flat side on the output shaft to prevent the arm from rotating on the shaft.
Comments - I really like this motor for the quiet operation and high torque. A PWM controller is really needed for most applications.
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