Thread: motor high gear/low gear switch...
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Unread 23-06-2002, 23:50
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#0047 (ChiefDelphi)
  
Join Date: May 2001
Location: Pontiac, MI
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Metal ring
Posted by Ken Leung at 1/29/2001 10:33 PM EST


Student on team #192, Gunn Robotics Team, from Henry M. Gunn Senior High School.


In Reply to: motor high gear/low gear switch...
Posted by Anton Abaya on 1/29/2001 9:00 PM EST:



What happens when you switch between high gear and low gear is you are choosing between two sets of planetary gears inside the gear box. Normally when switching gears on the hand drill, there is the plastic nob on top that you can push to go to high or low gear. Under that is a little metal strip that act as a lever, one end is being pushed by the nob and the other end it pushes a plastic ring with teeth inside that fit around the two planetary gear sets. So, to hold that plastic ring in place for either a high gear or low gear, you fabricate a similar ring without teehth inside(we used Aluminum last year), and that have to fit around the other planetary gear set you are not using, while it have enough thickness to prevent the plastic ring from engaging the planetary gear you don't want to use.

This method is extreemly reliabe, it worked really well for us lasty year, and we never had to worry about accidentally switching gear in the middle of the game.


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