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1717 Possible to snap motor shaft from too large pinion?
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Revorocks
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1717 Possible to snap motor shaft from too large pinion? - 01.14.2012, 06:02 PM

Hi there,

I'm doing a Hyper 7 speed project and will be running a pretty large pinion.
Is it possible to snap motor shafts from running too large pinions?

I'm running a Neu 1717 with 5mm shaft.
Will be running a 26T or 32T pinion.


E-Revo Brushless MMM + Neu 1515 5S
Hyper 7e MMM + Neu 1717 6S Speed Project
   
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Arct1k
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01.14.2012, 07:15 PM

5mm shafts rarely break.

Side loads on the shaft normally cause bearing failure.

High RPM's will cause magnets to crack..
   
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Revorocks
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01.14.2012, 09:16 PM

Ah ok, that's good to know.

I wouldn't have thought it was possible for the motor to sheer the shaft from sheer torque, but I just wanted to be sure.

Thanks


E-Revo Brushless MMM + Neu 1515 5S
Hyper 7e MMM + Neu 1717 6S Speed Project
   
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anunaki
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01.16.2012, 11:18 PM

Quote:
Originally Posted by Arct1k View Post
5mm shafts rarely break.

Side loads on the shaft normally cause bearing failure.

High RPM's will cause magnets to crack..
Can you explain what a side load is in detail.
   
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BrianG
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01.17.2012, 11:05 AM

Quote:
Originally Posted by anunaki View Post
Can you explain what a side load is in detail.
If you set the spur/pinion mesh too tight, the shaft tends to "push" against the shaft bearing (especially the front one). Therefore, a constant load on a bearing spinning that fast can cause premature wear.
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