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Unread 04-02-2003, 20:49
Dodd Dodd is offline
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#0095 (Lebanon/Upper Valley Robotics Team)
 
Join Date: Jun 2001
Location: Lebanon, New Hampshire
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Breathe deeply

Iain,

You have now received several different diagnoses of the problem you originally described, and it sounds as though you are troubled at what tomorrow's work on the drill gearboxes might bring. Before you wail into it, try one thing to firm up what the problem is.

With the wheels off the ground and the battery disconnected, just grab one of the wheels that is driven by a drill motor and gearbox with your hands and try to rotate it, first one way and then the other. Repeat with the other drill motor train. If the drive train locks up after very little wheel rotation, your problem is the two pins in the gearbox. From what you said in your post, it sounds like they were not removed previously. If this is the problem, look at a post by Al Skierkiewicz in the thread: "Drill Motors: Pins IN or Pins OUT" in this same forum for a description of how to dismantle the gearbox and remove the two pins.

If you are able to turn the wheels by hand, then everything connected to the wheels - all the way back to the motor armature - is rotating also. Rock the wheel back and forth and observe the behavior of the couplings, gears, and everything else visible in the drive train. If gear lash or movement on the shaft is the problem, you will see it. If a shaft coupling is slipping, you will see one side of the shaft joint rotate while the other side doesn't. You will have a much easier time of it correcting the problem once you identify it.

By the way, the left hand thread screw goes directly into the end of the gearbox output shaft. That shaft end is hollow and is tapped with left hand female threads. If you are using a kit supplied coupling to attach to that shaft, you first screw the coupling onto the right hand external threads on the shaft (REAL TIGHT), then reach down the bore of the coupling and screw the left hand thread of the screw into the internal left hand thread of the shaft.

I always found that rotating the wheels by hand from time to time is an excellent, quick, and sensitive means of inspecting the condition of the entire drive train for binding, slop, and loose or bent parts. Think about adding that step to your pre-match checklist.

Good luck tomorrow, and let us hear how you make out.

Dodd
 


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