Another Wheel Flat Question

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dangie

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If a wheel has to be machined to get rid of a wheel flat, does the opposite wheel on the same axle also have to be machined as well? Otherwise both wheels will be different diameters. Thank you.
 
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RailUK Forums

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Blackpool south Shore
If a wheel has to be machined to get rid of a wheel flat, does the opposite wheel on the same axle also have to be machined as well? Otherwise both wheels will be different diameters. Thank you.
They would be turned as a pair.
Blackpool Tramway has this equipment as posted by WatcherZero. Rail should be similar.

The new depot has a programmable autolathe that works on both the heritage trams and the new flexities. It turns the wheels of a new tram in 7 hours and a heritage tram in 4 hours, the heritage tram wheel turning used to take four weeks as they had to be dismantled first.

http://www.dailymotion.com/video/xnlpgn_blackpool-starr-gate-wheel-lathe_tech
 
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If a wheel has to be machined to get rid of a wheel flat, does the opposite wheel on the same axle also have to be machined as well? Otherwise both wheels will be different diameters. Thank you.
Most certainly. The tolerance between wheel diameters on the same wheelset is +/- 1mm
 

Ploughman

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15 Jan 2010
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Near where the 3 ridings meet
Also on a bogie vehicle there is a limit to the permitted difference between the wheelsets in the bogies.
Can't remember the figure but there was a limit I used to have to work to in York BREL on the wheel lathe.
 

millemille

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28 Jul 2011
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Most certainly. The tolerance between wheel diameters on the same wheelset is +/- 1mm
No it isn't.

Ex lathe tolerance is 0.25mm parity across the axle.

There is no in-service tolerance.

Tolerances between axles on a bogie and axles on a vehicle depends on the class of the vehicle, it's not a tolerance defined by GM/RT2466.
 

TGV

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320km/h Voie Libre
Most certainly. The tolerance between wheel diameters on the same wheelset is +/- 1mm
While it's possible this is applicable to a specific type of rolling stock, it's not a general rule. As said above, it is different from type to type.

On TGVs there is a broadly similar rule for all wheelsets. On a given axle the wheels should be within 2mm of each other. There is a tolerance band that allows re-profiling within a couple of weeks and if it is greater than 3mm then it requires immediate re-profilling.

There is NO limit on the differences between two axles on a bogie.
 
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