tyre turning question

[truckman060473]

ok so the process is the tyre is heated up and fitted to the wheel and then contracts when cold holding tightly onto the wheel. but somewhere else on the forum discuss the wheel shape to be "coned" to avoid the flange touching the rail, so what prevents the tyre from tending to slip off outward, away from the flange, seeing as it is not contracting on a purely flat surface?

 

[ralphchadkirk]

To put it simply - the flange on the other side of the bogie. (i.e. the opposite wheel)

 

[fsmr]

ok so the process is the tyre is heated up and fitted to the wheel and then contracts when cold holding tightly onto the wheel. but somewhere else on the forum discuss the wheel shape to be "coned" to avoid the flange touching the rail, so what prevents the tyre from tending to slip off outward, away from the flange, seeing as it is not contracting on a purely flat surface?

Hi, it is not the internal surface, only the outer running surface that is tapered which tends to naturally center the wheel off the flange preventing wear and noise on straight track
The internal suraces of the tyre and external surface of the wheel is parallel with slight oversize of the wheel to tyre diameters thus when the tyre is heated, the tyre then fits over the wheel contracting to a tight fit as it cools down. hope that make sense

 

[driver9000]

Tyre turning is the process of turning the wheel on a lathe to smooth out wheel flats by shaving the wheel tread.

 

[royaloak]

The wheel and tyre contact faces are flat, the tyre to rail face is coned, you are confusing the inside and outside faces of the tyre.
The flange is part of the tyre.

 

[ralphchadkirk]

Ah I see what you were asking now. I thought you were talking about the profile of the tyre, not the wheel.


As RoyalOak said, the surface between the wheel and the tyre is flat.

 

[truckman060473]

ok i see now. must be a tricky bit of steel to machine then if the tyre is the part that has the cone included

 

[No Fault Found]

Not really. You just put the profile you require into the lathe and start it. It's all automated.