Thread: Drill Motor Gearbox Reduction Ratios
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Unread 23-06-2002, 23:05
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#0047 (ChiefDelphi)
  
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Re: Drill Motor Gearbox Reduction Ratios
Posted by Harold Lawrence.

Other on team #458, RoboIndians, from Jefferson High School and NASA AMES.

Posted on 2/13/2000 10:31 AM MST


In Reply to: Drill Motor Gearbox Reduction Ratios posted by Ben Hebert on 2/8/2000 7:04 PM MST:



I measured the no load RPM in both high and low with a direct reading mechanical
Tach. In low gear it was 250. High was 750. These are actual values tested on
both motors +,- 2%.

Harold

: 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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