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Wheel assembly lateral movement

Stan

Joined: 1-01-70

Topics: 1

Replies: 1

Posted: Thu 10th Jun 2010, 9:51am
Wheel assembly lateral movement

I am building 7¼" miniature railway bogies. Wheel profile is to society standards with a 3º coning angle. Question is - how much lateral (side-to-side) movement should I allow for between the wheel/axle assembly and the support bearings? Does it depend on the minimum track radius? I can't find info on this anywhere.
 

Replies To This Post

Peter Beevers

Joined: 9-10-01

Topics: 3

Replies: 133

Posted: Wed 16th Jun 2010, 7:04am

You should not allow any lateral movement. It is not required.
Peter
 

Xz

Joined: 1-01-92

Topics: 17

Replies: 244

Posted: Fri 18th Jun 2010, 4:18pm

Peter is right, assuming they are four wheeled (two axle) bogies. If they happen to be three axle, then the answer depends on the wheel base versus the radius of the track.
 

Stan

Joined: 1-01-70

Topics: 1

Replies: 1

Posted: Tue 22nd Jun 2010, 9:04am

Many thanks. I was reading something about rail adhesion in wikipedia and got the impression that some lateral movement was needed when negotiating corners. Is the situation different with non-bogie vehicles such as four wheeled wagons?
 

Peter Beevers

Joined: 9-10-01

Topics: 3

Replies: 133

Posted: Tue 22nd Jun 2010, 3:03pm

No, 4 wheelers are the same. However, you may be alluding to gauge widening, where, on sharp(er) curves, the rails are set slightly further apart to allow the wheels to go round easily.
 
 
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