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Is Tyre Coning Necessary In 'O' Gauge ??
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 Posted: Wed Dec 20th, 2017 10:04 pm
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Si.
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Problem SOLVED !  ( or sol-ved, as Clouseau would say )


;)


" 0n3 Code110 ( or thereabouts ) wheelsets " ...


... can be obtained from here





Very fishy indeed Francois ...

... X-3170 if I'm not mistaken !



:moose:



Si.



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 Posted: Thu Dec 21st, 2017 03:28 am
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Salada
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Probably the only full spec RP-25 ex Tri-Orrible wheels in the world.........? :





No running test yet (later) - but we'll now see if tyre coning makes any difference. My hunch is it can't make things can't worse.

The reason I left the flange depth slightly oversize was to leave 'some meat' on the flanges when it came to machining the flange edge radii, R2 & R3 in above RP-25 diagram. Turning 0.018" radii is not really tooled up for 'out the drawer' in the SWW machine shop.

Thanks again to Helmut & Si. (any idea if them thar KD wheels are available in the Y.U.K. ?).

Thanks James, but as Helmut explained, I am working in 48:1 but using HO track standards (poor man's option but I have plenty else to waste my dosh £ on. I also have my local barman & his family to support). So pure HO stuff is way too small for U.S. 'O' Gauge.

Regards,  Michael







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 Posted: Sun Dec 24th, 2017 12:26 am
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Si.
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" any idea if them thar KD wheels are available in the Y.U.K. ? "



Hi Michael :mex:



The Kadee On30 wheelsets ARE available in Blighty ! :old dude:

I buy mine from 'Gaugemaster' in the link Clouseau found ^^ above. ;)



High-tech Placky(TM) axles, with metal cast wheels.

A straight swop out for Bachmann, Hornby, etc. etc. HO wheelsets.








Here they are, with NEW axle-bearings on some  M.M.M.M.M.& M.Co.  'Tri-orrible' diecast passenger trucks.

A favorite with Wolfy & the  M.M.M.M.M.& M.Co.  carshop ! :cool:



More info & photos etc. HERE



:moose:



Si.



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' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Mon Dec 25th, 2017 09:09 pm
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Si.
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:brill:



Si.



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' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Tue Dec 26th, 2017 04:27 am
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tebee
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If you don't use coning every time your wheelset is running round a curve one wheel on each axle is slipping.

This will cause loss of traction on driven wheels and excess drag on non driven ones.

Tom



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 Posted: Wed Dec 27th, 2017 08:00 pm
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Helmut
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Which is all true for the prototype, but not for the "tramway" radii used on model layouts. As even the NMRA state in their RP25, tread taper is not necessary for models, whereas proper fillet and flange rounding are. The 'guiding' effect seen on a single truck or car rolling down a straight length of track is due to the fillet, not the taper. Once it is part of a group of cars being drawn along, all guiding work relies on the flanges, especially in curves.



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