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Unread 14-03-2012, 11:27
RRLedford RRLedford is offline
FTC 3507 Robo Theosis -- FRC 3135
AKA: Dick Ledford
FRC #3135 (Robotic Colonels)
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Re: Cim-Sim gearbox for shooter questions

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 were initially burning up the 550 motors from a having a bad wire terminal connection arcing issue.

After that was fixed, we are still destroying the 550 bearing at the pinion gear end of the 550 shaft (two already). We broke in our gearboxes gradually before loading them, even changing grease after 1 hour.. They were running cool during the break in stage with everything spinning at full speed. Any ideas why motor bearing would self destruct so quickly -- 30 min to 90min of use and less than 100 shots?

We are converting today to the single 775 motor setup of the Cim-U-lator and testing for how much distance/RPM we lose from the fact that 775 is an 18V motor running at 12V. We can regear for more RPM if necessary, but we hope this larger motor can handle whatever the shaft loading issue is that is killing the 550 motor's front bearings. Any ideas why the 550 bearing nearest gearbox would be getting thoroughly chewed up so fast?

Which allowed AM motor(s) used this year with CIM-sim gearboxes are giving good distance for shooters?, and will any AM motors match up properly with the dual motor CIM-U-lator gearbox, as far as motor mounting and shaft diameter (in order to use same pinion gears as fit the 550 shaft)?

-Dick Ledford

Last edited by RRLedford : 14-03-2012 at 12:18.
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