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Drill Motor Gearbox Reduction Ratios
Posted by Ben Hebert.
Student on team #192, Gunn Robotics Team, from Gunn High School and Sun Microsystems/NASA Ames/Xerox PARC/Nortel Networks/Scitor/Alan Steel/Madco/Vanderbend.
Posted on 2/8/2000 7:04 PM MST
I'm sure this info is out there somewhere, but I was wondering if anyone could tell me the reduction ratio
that the gearbox applies in both high and low gear. Experimentally (ie... screwdriver instead of motor,
counting rotations), we think it is 3-4 times in high gear and 16 in low gear. However, the motor has a
no-load speed of 20000 rpm, and the actual drills these assemblies are associated with claim to have a
no-load, high gear speed of 1200 rpm. This implies about an 8 times reduction, which is very different
than what we experimentally determined. Can anyone tell me what the ratio actually is and explain this
(apparent) contradiction?
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