Page History: Unisaw Bullet Motor Repair
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Page Revision: 2012/01/18 00:25
This page shows some of the main internal components of a single-phase Unisaw repulsion-start/induction run (RI) "bullet" motor. The page covers three major elements in troubleshooting and repairing internal components:
- Turning the commutator and undercutting the mica
- Fabricating and replacing the shorting necklace
- Replacing the brushes
The approaches and tools shown in the original entry on this page were done in a hobbiest garage-shop, using moderate level tools such as a lathe, and do not require significant machinist skills or equipment.
Turning the Commutator and Undercutting the Mica¶
The first place to start in
Fabricating and Replacing the Shorting Necklace¶
The "shorting necklace" inside the commutator is often one of the most common failure points on a Unisaw RI bullet motor. It is also one of the most troublesome parts to either locate for replacement. In addition to showing one method for fabricating a new shorting necklace from small extension spring stock, the page also shows demonstrates briefly the turning the commutator and undercut the mica, as well as replacing the brushes