Hi,
I have a small question. Are we allowed to you use more than one globe motor on our robot? I couldn’t find any restriction regarding it, so it is quite ambiguous…
Thanks,
Guy
I have an additional question relative to the globe motors, sorry its not related to the above post but does anyone know how they handle direct drive cantilevered loads.
I understand cantilevered loads aren’t usually in good practice, but it might be slightly unavoidable in this situation, and I was wondering how that bronze bushing holds up under load. Also without wanting to pull it apart, is there another bushing/bearing inside the motors planetary gearbox or is the one viewable the only one?
Ohh by the way According to Paul C. in this thread, the motors and quanties are listed below
The motors you can use (and their respective quantities) listed:
QTY 4 2.5" CIM Motors (2 in the kit plus 2 for purchase)
QTY 2 3" CIM Motors, aka the Mini-Bike motor (1 in the kit plus 1 for purchase).
QTY 2 Globe motors (both in kit only)
QTY 2 window motors, the shiny ones with RH / LH (both in kit only)
QTY 1 Denso motor, the other window motor (in kit only)
QTY 2 Banebots motor (in kit only)
QTY 2 FP motors (in kit only)* - this one is still pending a clarification since we received 2 but the list states 1.
The total is 15. Of course, direct replacements are O.K. for any of the motors (if one breaks), but the only motors you can use in larger quantities than provided in the kit are the 2.5" CIM and the 3" CIM.
Update has clarified FP motor discrepancy…now lists 2 to match the 2 we all got to start with…
It is my understanding that the Globe Motor’s attached gearbox is easily damaged by side loads. We have been warned about this often in the past. I’ve not read something this year, but it has been in previous documentation and I believe the motor is the same from previous years.
Good Luck!
-Mr. Van
Coach, 599
The RoboDox
Does the Globe motor tend to heat when static load is applied on it?
Is it suitable for static load ?
Our team has modified the planetary gearing on these motors for the last two years, as they one of the few motors that you are allowed to modify or remove the gearing.
There is only one bronze bearing which cannot support thrust loads (in and out), but can accept some side loading (like a gear or sprocket) as long as the object is mounted on the transmission output shaft itself.
Overall these motors are great little gearmotors, and I’m very happy to see that the KOP included two this year. They have never quit on us and they do not overheat as much as other motors.
The Globe motors as others have pointed out, can handle very small side loads. Unfortunately, when the bearings start to fail they go fast. I have not seen these motors used in real life with any significant side load or large diameter gears on the output shaft. They are reliable when protected.
I wonder if the Globe would be able to withstand a sizeable side load, within 1/2" of the bronze shaft bushing, if the end of the shaft were well supported with a ball bearing.
Gabe is correct in his description of the internals of the gearbox. That bronze bushing is the only support on the output side of the gearbox. By supporting the outboard side of the shaft, you will have two properly supported ends. This type of setup should handle pretty much any load you can throw at it.
I’m not sure I’ve heard of anyone stalling a Globe motor and burning it out. This motor has so much torque that it has basically ripped through our mechanical stops in the past. We always use limit switches/pots with these motors.
Good Luck,
BEN
Thanks, I was at the hardware store, a 1/4" id x 5/8" od ball bearing is readily available, and since it’s od is the same as the end of the motor, it should be possible for us to make two plates that will keep it all in line relatively easily.
If the chain will fit in the available space, and leave room for mounting the sprocket, that is…