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                                       Wheel Profiles 4mm - 00-SF and EM
     
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1st message | this message only posted: 15 Jan 2017 09:32
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from:
Godfrey Earnshaw
Crawley, United Kingdom

 

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In the EMGS, January 2017, Newsletter, there is a review of a Sutton's Locomotive Works BR Class 24 B0-B0.
The reviewer, Phil Tattershall, expressed the following opinion regarding the wheels:

"Having given a glowing account so far, I have to report that, on placing my loco on the track I could not detect any side-to-side clearance between the wheelsets and the track. Closer examination revealed that the profile of the EM gauge wheels is identical with that of the NMRA RP25-110 ones supplied for 00 gauge but with longer axles to accommodate a 16.5mm back-to-back. There is no doubt that the loco does run on EM track but, if there is any tightness of gauge on your track, there could perhaps be problems. The attached photo shows the profile of the wheels (00 gauge to avoid me removing the EM ones from the loco). The larger root radius between the tread and the flange itself combine to cause the problem."


Phil goes on to say that the loco should have been fitted with EMGS profile wheels.

I have quoted the above because it has always been my belief that 00-SF(4-SF) was EM gauge 18.2mm minus 2mm and that the raison d'etre of 00-SF was that it would accept many wheel standards without modification, particularly 00 RTR wheels and RP25-110 wheels (I believe RP-88 wheels are regarded as too narrow.

Additionally I have often changed my wheelsets from 00 to EM, by changing the Back-toBacks.

Am I very mistaken,  I've never had any problems, or have I just been lucky.

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2nd message | this message only posted: 15 Jan 2017 10:49
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Please do not send requests for help direct to me via email or PM.

Post your questions on the forum where everyone can see them and add helpful replies.
Hi Godfrey,

If RP-25/110 wheels (i.e. ex 00 RTR) wheels are used on EM they should be set to 16.4mm back-to-back, in other words 4-SF (00-SF) + 2mm.

The significant dimension is the back-to-flange dimension, which should not exceed the 17.2mm EM check gauge. With flanges 0.8mm thick, that means the maximum back-to-back is 16.4mm.

For EM dimensions go to

 http://4-sf.uk

and add 2mm to all figures.

regards,

Martin.

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