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| Re: Wheel Axles (344227) | |||
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Re: Wheel Axles |
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Posted by tracksionmotor on Mon Nov 27 22:31:06 2006, in response to Re: Wheel Axles, posted by Jace on Mon Nov 27 10:52:31 2006. Wheel profile is set by contract upon initial purchase...the most common for MTA 36" wheels is #239 although I have encountered a few #235s. The Simmons machine has two horizontal profile cutting heads which approximate the profile. Excessive wheel truing loses original profile...most passes are clean outs to remove minor defects and flatzzzz. In my time I have not encountered a 'thin flange.' Subways are pretty good as far as wheels are concerned...flatzzz are small and monitored. M7 EMUs have much larger flatzzz along with shelling...spalls are not so bad. As for freight, they run the trucks until wheels go 'square'......tread thickness after truing must exceed 16/16ths of an inch to return to service...passenger rail must exceed 20/16ths with flange height 17/16ths.For those reading this post 'without a clue,' railroad wheel measurements are made in 1/16ths of an inch using a wheel gauge that measures the thickness of the wheel, the height of the flange and how much metal must be machined off to restore the wheel to its closest original shape. The 'flange' is that big lip on the inside side of the wheel designed to prevent the train from leaving the track. Few flanges are too thick...a thin flange offers possibility of breakage and or derailmant....a high flange offers derailment when engaging interlockings and switches. Wheel Profile 101. RRCI Peter |
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