Don't know the specific design...but-there should be a spring loaded
contact ring around the base or a set of inertia switches internally
that momentarily reverse one of the drive motors on impact. However it
is configured, the offending device is stuck 'ON'. Perhaps a broken
spring, or the unit was dropped and an inertia switch is stuck. Or, no
fault with the sensing circuits; one of the drive motors is dead, thus
it only spins.
JR

trigon wrote:

Can anyone here help me with a problem I have with a 1980's bump n go robot,
the bump n go is purely mechanical and I don't have a very good mechanical
mind so I am not quite sure how this works, I have spent an hour searching
the net but have had no luck finding any info on how this mechanism works or
what to do if it has a problem. Anyhow the problem is that the robot mostly
spins on the spot, I presume it is suppose to go straight until it hits an
obstacle. I can see how everything else works but can't figure out how it
achieves the bump n go. So if someone could either point me in the right
direction or help me out directly it would be much appreciated. I would
really like to find a webpage that describes how this works.




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