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Unread 30-03-2009, 22:32
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Re: Globe Motor Durability Versus RS-545

In my 4 years of first I have had a Cim fail, multiple Fisher prices fail, a Denso fail but NEVER a Globe. I'm sad I couldn't find a use for the globe motor this year though, it would be the last thing on the robot that could fail.
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Unread 30-03-2009, 22:53
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Re: Globe Motor Durability Versus RS-545

In my experience, all the banebots motors do not do well once they are stalled (esp at high voltages). Our floorload roller is powered by a 545, and they smoke really quickly if there is a jam and if the motor keeps trying to pull balls in, causing it to stall. After destroying a good 3 or 4, we decided to use a FisherPrice motor on our practice robot, to save some money.

Globe motors, however, have always been very durable, in my experience with them. I am yet to destroy one, even damage one. However, I do believe that they are not quite as powerful as the 545s.
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Unread 31-03-2009, 00:16
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Re: Globe Motor Durability Versus RS-545

We've never been able to find an application for the Globe motor, with our limited machining ability. Now that AndyMark sells shaft adapters, its more likely we could use it sometime...

We have used the Banebots motors, and as long as you don't put them where they can be stalled, and don't work them too hard, they do fine. We have two on the robot this year and they haven't cause any problems. One turns a small roller that slips if a ball gets stuck on it, the other turns the turret with a V belt, which slips when the turret hits the mechanical stop.

Sounds like the OP is looking to use the motors where they might be iffy, so Globe should be the way to go, assuming the transmission can be modified appropriately.
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Unread 31-03-2009, 12:15
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Re: Globe Motor Durability Versus RS-545

Quote:
Originally Posted by squirrel View Post
We've never been able to find an application for the Globe motor, with our limited machining ability. Now that AndyMark sells shaft adapters, its more likely we could use it sometime...
Thanks to Jabba the Hutt, we didn't need to wait for AndyMark to offer a solution. However, the AM part is more versatile.

Seriously, I have never seen a Globe fail. Smoke, yes; fail, no. We've used them in stock condition, with threads cut on the shaft-stub, and with one gearing stage removed.

I even tried to get the team to use one for extreme torque by chaining it to a rachet, but they haven't found a mechanism that can use that solution (yet).
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Unread 31-03-2009, 16:29
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Re: Globe Motor Durability Versus RS-545

67 modified a globe gearbox to speed up our conveyor system that feeds the "shooter". In this modified condition, the globe did not have enough torque to overcome our drivers aggression to load many balls into the conveyor quickly. The motor would become stalled and the drivers would have to reverse it to correct the issue. The globe motor never burned up even though it was stalled many times during practices.

We then replaced the globe with a RS-545 and a P60 64:1 gearbox. We competed at Cass Tech, then went to Lansing and lost a RS-545 during practice on Thursday b/c we stalled it out trying to pickup to many balls. We replaced the motor, competed at Lansing, then went to Troy and lost the RS-545 when we tried to pickup to many balls. We replaced it again and competed at Troy without issue.

The morale of the story is to not stall the RS-545 or you will be replacing it. Luckily, we have failed these motors at opportune times so far. I am sure we will lose another one before we are done with this robot. Odds are, sometime on Thursday at MSC.

We realize that we are asking this motor to do a little more than it is capable of, and we may burn it up if exercised too aggresively. Given the cost ($6/motor) and weight we are comfortable with the risk we are taking.

The P60 gearbox though is top notch! Light weight and compact.
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Unread 31-03-2009, 16:44
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Re: Globe Motor Durability Versus RS-545

Last year we used two Globes to drive down 250+ pounds of spring force for our ball shooter. We stalled them a lot while we were building the shooting mechanism, but I don't remember replacing them.

If your looking for reliability: Globe.
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