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| Re: Flat wheel spots on the R46 (350965) | |||
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Re: Flat wheel spots on the R46 |
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Posted by tracksionmotor on Sun Dec 10 16:25:17 2006, in response to Re: Flat wheel spots on the R46, posted by Train Dude on Sat Dec 9 21:27:13 2006. An 8" flat on a wheel of 34" diameter represents about eight percent of wheel tread.....a nasty number. The NYCTA standard as I was taught is 1/8th inch measured by drill bit against straight edge of wheel gauge...,.if it does not touch, you must adjust....flat is deeper than 1/8th to be reported.A three inch flat on MNCR is a matter of concern...I mark wheels for THEM to see. One of my gauges has a 1" hole...if a spot fits within, it passes. Rail knowledge: see a defect on a wheel, look at opposite wheel for same defect in same place. A trainset with multiple flatzzz does not have synchronicity because wheels do not rotate in syncopation like a steam locomotive...you have to make an effort to look and feel them. My first lesson was feeling shelling out of sight cutting my fingers open. I always cite chips because their depth may exceed wheel truing and warrant furter investigation. An M7 married pair with one axle flat is not an isolated axle....unless propulsion failure....ATC senses excessive wheel spin and loss of traction disengaging PCE systems and going BIE...which it was designed to do. RRCI Peter |
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