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Inside later model Betas are several small self-commutated permanent magnet motors that operate various assemblies. These drive various gears and operate the transmissions on the threading and loading units. Most have small castle shaped universal joints (or cogs) bonded to their shafts. This arrangement allows for slight misalignments and offers a small amount of play. Failure occurs when the polystyrene plastic drive (cog) attached to the shaft cracks. This allows the rod to slip inside the plastic. Operation then becomes faulty and unreliable. Here is how this problem is solved. In the first photo above, and there are three in this discussion, the arrows are pointing to the universals. The next photo shows the cracked and split castle shaped cogs close up. You can plainly see why once they have split, the plastic loses its hold on the motor shaft and slippage will occur. The next photo shows the repair. Special sized metal rings that I have prepared on a jewelers lathe are forced over the cogs to close the crack(s) together. Next the shaft on the motor is abraded to insure a solid footing for the plastic. Once pressed together the ring insures that the cog and shaft maintain a good, solid connection. To proceed to the next section that describes the EXTERNAL CLEANING AND RENEW click here.
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