fac Posted January 12, 2016 Posted January 12, 2016 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.
LCDR Posted January 13, 2016 Posted January 13, 2016 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 TRACKGauge (G) min. 16.50 mmFlangeway (F) min. 1.25 mmOver wing and check rails © max. 14.00 mmWing rail to opposite running rail (CN) min. 15.00 mmSleeper length on plain line (S) 32.00 mmSleeper width on plain line (SW) 3.50 mm WHEELSWidth over wheel (A) 2.50 mmTread width (B) 2.00 mmFlange depth from face of wheel (D) 1.00 mmWidth of flange (E) 0.50 mmBoss of wheel from face of wheel (P) 0.25 mmRadius tread to flange ® 0.50 mmConing 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 AXLESPlain bearing diameter (A) 1.83 mm (15 SWG)Back to Back (B) 14.50 mmFrom outside of one flange to inside of opposite flange © 15.00 mmWidth of axle over plain bearing (X) 27.00 mmWidth over wheel bosses (Y) 20.00 mm
LCDR Posted January 13, 2016 Posted January 13, 2016 I will post diagrams but these will take a while to publish of course.
LCDR Posted January 13, 2016 Posted January 13, 2016 /media/tinymce_upload/08a1a9671626d9eb8c17b9a6f4a20df9.jpg/media/tinymce_upload/70cb077b2018f14759c1bb6e49564521.jpg/media/tinymce_upload/002609179df37b945568e14531f63aec.jpg
RB51 Posted January 13, 2016 Posted January 13, 2016 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-
LCDR Posted January 13, 2016 Posted January 13, 2016 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.
Flashbang Posted January 13, 2016 Posted January 13, 2016 The Double O Gauge Association (DOGA) publishish UK OO track and wheel standards and they are freely available on the Internet to all.Standard track dimensions page... http://www.doubleogauge.com/standards/commercialtrack.htmStandard wheel dimensions.... http://www.doubleogauge.com/standards/commercialwheels.htm
fac Posted January 13, 2016 Author Posted January 13, 2016 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.
LCDR Posted January 13, 2016 Posted January 13, 2016 The Double O Gauge Association (DOGA) publishish UK OO track and wheel standards and they are freely available on the Internet to all.Standard track dimensions page... http://www.doubleogauge.com/standards/commercialtrack.htmStandard wheel dimensions.... http://www.doubleogauge.com/standards/commercialwheels.htmYes, but does it explain why?
LCDR Posted January 13, 2016 Posted January 13, 2016 The Double O Gauge Association (DOGA) publishish UK OO track and wheel standards and they are freely available on the Internet to all.Standard track dimensions page... http://www.doubleogauge.com/standards/commercialtrack.htmStandard wheel dimensions.... http://www.doubleogauge.com/standards/commercialwheels.htmYes, but does it explain why??
Teedoubleudee Posted January 14, 2016 Posted January 14, 2016 This thread would be useful as a "sticky"
Yelrow Posted January 14, 2016 Posted January 14, 2016 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
LCDR Posted January 14, 2016 Posted January 14, 2016 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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