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| Re: Flat wheel spots on the R46 (350533) | |||
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Re: Flat wheel spots on the R46 |
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Posted by tracksionmotor on Sat Dec 9 15:25:40 2006, in response to Re: Flat wheel spots on the R46, posted by BIE on Sat Dec 9 12:33:29 2006. No, wheels are not changed out. Every inspection includes wheel gauging to include tread depth, flange height, flange thickness and tread surface defects. Information is noted on undercar inspection report. Cited defects are noted for future wheel truing operations unless defect is very serious. I never saw a flat in subways to take a car out of service. What will eventually happen is truck goes through truing...a grind or maybe just a pass...final results may result in different wheel readings...one axle may have new wheels and the other old/smaller..MNCR likes consistentsy. IF one axle measures 36 X 2 and the other axle in the truck measures 34 X 3, first cut will be to 31 on both axles to bring flange height to standard 1 1/16th inch with tread thickness of 1 15/16ths unless major defects unless major defects have not been overcome....deep chips in tread are a matter of concern which cannot be 'trued out' on a wheel lathe. Reference: New wheels 36" diamater profile #239 display '48' on your AAR 52/80/WR600A gauge. 48 is 48/16ths...three inches. Limit is 20 for passenger which means wheel is about 32" in diameter to scrap...freight scraps at 16. 'Rule of thumb' for passenger wheels is based upon 'witness grove' on outside vertical edge: If tread space is equal or less than space below groove, wheel is unservicable. Wheel gauging is not a casual matter...you are supposed to take the measurement in three places and be darned well sure gauge touching tread is not sitting in a flat!!!!! M7 has its own gage to measure AVERAGE diameter which is not AAR/FRA standard. I can take any AAR wheel gauge, measure tread depth, multiply that number by two and subtract results fron 36" base diameter for true diameter. I have my own new certified gauges from Winchester (railroadgage.com) I worked for the BEST that pushed me to learn/work/do. My former supervisor is now a CI working for a favorite Superintendent in the Bronx...two good guys. Santa Claus maintains an 'Inspection Record.' RRCI Peter |
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