1717 Possible to snap motor shaft from too large pinion?

[Revorocks]

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.

[Arct1k]

5mm shafts rarely break.

Side loads on the shaft normally cause bearing failure.

High RPM's will cause magnets to crack..

[Revorocks]

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

Originally Posted by Arct1k

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.

[BrianG]

Originally Posted by anunaki

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.