Rotational problems in quartering coupled driving wheels

[GreensandsParticipant @greensands]

hi – i am having issues with quartering the coupled wheels of a 3.5″ gauge locomotive having set up and pressed home the wheels on the first axle but when repeating the operation on the second axle using the lathe baed as a reference surface, the wheel being pressed home is rotating out of position. The wheel has been machined to a good fit on its seating and I am loathed to ease it out but it may be the only option. Any helpful suggestions would be most welcomed.

 

[Speedy Builder5Participant @speedybuilder5]

I would have expected a hole in the top plate (to locate the crank pin) of your quartering jig 90 degrees to the slot in the bottom plate. However with just 2 long studs, can you guarantee that the top plate does not twist out of alignment to the bottom plate ?

Bob

[Speedy Builder5Participant @speedybuilder5]

You may like to read this article

https://stalbansmes.com/wp-content/uploads/2019/01/Another-little-job_-No-4_-Wheel-quartering.pdf

[Robert Atkinson 2Participant @robertatkinson2]

I may be stating the obvious but if you want to rotate a wheel on the axle you should heat the wheel to loosen it’s grip. I’d use a hot air gun.

Robert.

[Author]

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