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Unread 21-01-2011, 12:16
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Re: pic: Shaker 2011 Arm Gearbox (Maybe?)

So a nice and easy way to reduce weight is to replace most of the gears with 50 tooth AL cluster gears. I assume for the first two reductions this won't compromise gearbox strength - but how can I check on the third? I swore I learned how to do this in Strength of Materials but it's escaping me right now.
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Unread 21-01-2011, 13:22
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Re: pic: Shaker 2011 Arm Gearbox (Maybe?)

Something like this will give you a good idea.
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Unread 21-01-2011, 14:29
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Re: pic: Shaker 2011 Arm Gearbox (Maybe?)

Thanks.

Looks like going aluminium on that third reduction is pushing it - so two AL gears and one steel 50t gear would be the best configuration for the gearbox.
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Unread 21-01-2011, 14:54
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Re: pic: Shaker 2011 Arm Gearbox (Maybe?)

That sounds sane. You could also pocket out the gears quite a bit.
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Unread 21-01-2011, 15:32
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Re: pic: Shaker 2011 Arm Gearbox (Maybe?)

For high reduction arms, depending on how they are loaded, it's possible the motor never even comes near stall torque, so aluminum may work fine.

Also, if you space your plates 1.125 apart, you can make this same gearbox with ZERO custom shafts, and the use of no spacers, by utilizing the toughbox and cimple box gears. It's a trick we've been using for three seasons now.
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Unread 21-01-2011, 15:55
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Re: pic: Shaker 2011 Arm Gearbox (Maybe?)

I did try and use all Toughbox custom shafts, but with the compound gear reduction a wider gearbox was needed to prevent gears from meshing with multiple stages.



However I think I'll try and use gears with different center-center distances to try and get away with TB shafts.
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