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Stator grinding problem, ceiling fan motors

2003

I work in a factory producing ceiling fans. to maintain the air gap between the stator and rotor of the motor the wound and varnished stator is mounted on cylindrical grinding machines to grind the stator outer diameter to 124.000 to 124.025 mm from 124.000 to 124.125 mm. the raw stator outer diameter varies from 124.125 to 124.375 instead of 124.000 to 124.125 mm. As a result, repeatability of the dimension does not take place and the Cp and Cpk is below 1. as we adhere to M.O.S.T norms for production and productivity norms are stringent the grinding dimension is really not maintainable and affecting the entire chain of activities.can I have some expert advice please?

SASHI PRABHU
electrical oem - PONDA GOA, India

Buy an appropriate grinder and then use the best wheel to maintain the surface finish and production speed. This is rarely paid attention to and there will be a range of wheels that will work, some much better than others.

James Watts
- Navarre, Florida
2003

The grinder must be strong enough and in optimal conditions for the job. Is the work done between centers? If so, there is a possibility that the part lacks the strength to resist the forces applied, thus bends or begins to vibrate. Is a centerless grinding possible?

Guillermo Marrufo
Monterrey, NL, Mexico
2003

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The dimensions what you mention looks like ceiling fan housing where you can go for a pressure die cast (Aluminum) one & in a PDC component CNC machining is enough & 25 micron tolerance can be maintained.

Or else think of Roller burnishing tool.

S Meenakshi Sundaram
- Chennai, Tamilnadu
2003