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Unread 14-03-2012, 12:31
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Ether Ether is offline
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Re: Cim-Sim gearbox for shooter questions

Quote:
We have been using a Banebot Cim-U-lator with the dual 550 motor setup.
We have adjacent dual 8" AM gray urethane wheels on a 5/8" shaft with a 1:1 ratio 30 tooth pulley pair drive. The balls are pinched against a mostly flat 1/4" plywood sheet with its surface covered by high friction shelf liner.
The plywood is slightly bent at entry end to give a funnel shape. We have been able to shoot initially 40+ feet before we started having gearbox and/or motor troubles.

We did install spacers for maintaining airflow between the 550 motors and their gearboxes, using large 3/8" steel washers cut into a 4-lobe spider to match the vent & mount holes there.

we are still destroying the 550 bearing at the pinion gear end of the 550 shaft (two already).

Any ideas why motor bearing would self destruct so quickly -- 30 min to 90min of use and less than 100 shots?
Yes.

2.7 speed reduction on a 19300 rpm motor driving 8" wheels => high torque on pinion.

How much engagement was left of the pinion into the first-stage gear in the CIM-U-LATOR with those spacers?


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