Thread: Helical Gears Gear Ratio
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Unread 22-01-2003, 17:33
jskene jskene is offline
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With the stock 9" wheels and the 2/1 reduction of the stock helical gearbox supplied in the kit, the drill motor will push your robot at 8.8'/sec. in low gear. This is pretty fast. ( In high gear, your speed will be 29'/sec!!!)

It appears that you can swap the 24 tooth gear for a 36 tooth gear, reducing your speed to 5.9'/sec, much more manageable. The 36 tooth gear has a pitch diameter 1" larger than the stock 24 tooth gear, so you will need to slide the plastic drill motor shaft bearing blocks 1/2" farther away from the large gear. If you file out the end of the plastic holder on the gearbox end plates, you should be able to do this. You can then drill new 1/4" locating holes through the side plates to hold everything in the new position. When we receive our new gears and have made this modification, I will post some photos.
Note that MSC does not carry this size of gear. You can get it from any BostonGear distributor.
Last edited by jskene : 22-01-2003 at 17:35.