So, where I work, we have this arcade game, which is a classic claw machine. IN order to raise the claw up and down the machine makes use of a worm gear, like so: (although for the meticulously curious, this is actually the drive that moves the trolley the claw rests on back and fourth but it is almost identical to the part in question.)
I noticed that the gear seems to be on little grooves here. On one of our machines , the gear has actually come off of the grooves on the horizontal shaft. This has been causing the gears to slip whenever the motor tries to rise the claw. I assume this can happen because the vertical gear puts friction on the other gear that makes it tend to slide in the direction of rotation along the shaft, so my question is this:
Is this gear on the horizontal shaft held in place by friction (if I slide it in place until it is hard to move from pressure between the shaft and diameters of the gears, am I good) or do I need to clean the shaft and apply some adhesive in order to expect it to stay? It works okay now, but I didn't exactly test it extensively.