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Point check rail measurement


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Posted

I purchased my hornby points possibly some time prior to them being the latest standard.(Although it was possibly old stock ,how would i know, was there a part number change?)  I have read on this forum of stock de railing at points and that firstly the back to back wheel measurements should be checked with tolerances given. I have also read that the check rail on older points could be closed toward the rail with addition of .02 thou plastcard. Can anyone give accurate measurement for required rail to check rail. Then i can check and adjust my points accordingly as with the wheels. This could give usage for my redundant feeler gauge.

Posted

 So far as I can ascertain the following dimesions agreed by the British Railway Modelling Standards Bureau are still current, but may NOT be used by all manufacturers.

 

BRMSB OO wheel and track standards

 

TRACK

Gauge (G) min.                                                                 16.50 mm

Flangeway (F) min.                                                            1.25 mm

Over wing and check rails © max.                                  14.00 mm

Wing rail to opposite running rail (CN) min.                      15.00 mm

Sleeper length on plain line (S)                                         32.00 mm

Sleeper width on plain line (SW)                                          3.50 mm

 

WHEELS

Width over wheel  (A)                                                      2.50 mm

Tread width (B)                                                                 2.00 mm

Flange depth from face of wheel (D)                                 1.00 mm

Width of flange (E)                                                              0.50 mm

Boss of wheel from face of wheel (P)                                  0.25 mm

Radius tread to flange ®                                                    0.50 mm

Coning of tread                                                                      3 deg. (1 in 20)

Taper of flange (each side)                                                   10 deg.

Tolerances   (A)  = +0.002 / -0,  (D)  -0.005 / +0 , (E) -0.002 / +0.005.

 

WHEELS ON AXLES

Plain bearing diameter  (A)                                                             1.83 mm (15 SWG)

Back to Back (B)                                                                            14.50 mm

From outside of one flange to inside of opposite flange ©          15.00 mm

Width of axle over plain bearing (X)                                                27.00 mm

Width over wheel bosses (Y)                                                           20.00 mm

Posted

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Posted

That's very comprehensive LC. One of the best reads on the subject I have come across in a long time. Taken from one of your personal reference books I assume? R-

Posted

 There were lots of useful booklets around in the 1950s & 1960s but nowadays information is harder to find, except perhaps on the internet, but the data posted there is frequently suspect. Very little of the 'basics' is published nowadays. I am however glad I did not throw mine away as they became dog-eared and grimy with use. In fact I now scout for them at toyfairs and model railway shows.

Posted

WoW, no excuses now then. Thank you for this sustantial information i should now be able to ascertain any consistent cause of  derailment.

 

Thank You.

Posted

Sticky, latching, what we need is a dictionary to explain these new words what are creeping into our language. Last night in a film, they called a bomb, a cookie. Why not call it   a bomb. john

Posted

 The term 'cookie' was used by the RAF Bomber Crews way back during World War 2.  So it can hardly be regarded as new as it is even older than me!

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