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| Re: Flat wheel spots on the R46 (351473) | |||
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Re: Flat wheel spots on the R46 |
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Posted by Jace on Mon Dec 11 10:28:41 2006, in response to Re: Flat wheel spots on the R46, posted by tracksionmotor on Sat Dec 9 15:25:40 2006. The propulsion system requires the wheels to be within a certain tolerance. On AC drives, all wheels on the same inverter usually have to be within 1/4". DC drives are usually more forgiving allowing 3/8" or even 1/2" mismatch. Most AC transit cars have two inverters so the wheels only have to 'balanced' on each truck, but some cars have only one inverter so all wheels on the car have to be within 1/4". One of the drawbacks of AC drive is that it results in more wheel truing to keep these tolerances. Diesel hydraulics are even worse - they typically allow for only 1/16" mismatch across all wheels on the car and then you've got to deal with dropping drive shafts to cut the wheels. |
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