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Thread: help with gear ratio

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Old 02-28-2006, 03:39 AM   #1
Pebble Pounder
Join Date: Aug 2005
Location: Monticello
Posts: 172
Default help with gear ratio

i have tried several times to figure my final drive ratio but have not come up with the same number twice. I have had a range from 85.2:1 to 398.7:1. would someone mind giveing me a hand?
65 turn lathe motor (purple brush springs for more torque)
gd600 gear reduction (stock)
pinion gear=9 tooth
spur gear=72 tooth
axle ratio=3.30:1
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Old 02-28-2006, 04:47 AM   #2
Quarry Creeper
Join Date: Nov 2005
Location: Italy
Posts: 262

What tranny are you using? You need to know the tranny ratio too to complete the calculation.
If the GD600 has a common 3:1 ratio, and you pinion/spur ratio is as follows: 72/9=8, e.g. 8:1 ratio, then the final ratio would be spur ratio*GD600 ratio*tranny ratio*axle ratio
At the moment is 8*3*?*3.3= find the tranny and you have the answer
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Old 02-28-2006, 11:03 PM   #3
Pebble Pounder
Join Date: Aug 2005
Location: Monticello
Posts: 172

transmission is 2.72.

so if i figure right 8*3*2.72*3.3=215.424:1 final ratio?

thanks for all the help
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