Templot Club Archive 2007-2020
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posted: 29 Apr 2008 18:09 from: rodney_hills
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Brian, I've started a new thread, but this is actually a follow-on from certain matters that were discussed in existing threads under the titles: "Out of one's depth" and "0-XF or 0-SF?". For my own interest and education I'm presently studying the arithmetic of the wheel/rail relationship and, being interested in gauge-narrowing approaches, was trying to collate the full set of dimensions for each of the 0-gauge finescale variants. You wrote in one of my cited threads above: Brian Lewis wrote: "My own 40 foot 0 gauge layout is 0-XF and I have 8 years experience in building and operating to this gauge. There are limitations - a B7 is in reality the minimum turnout that will ensure faultless operation; wheels should be of a standard similar to Slaters, but that is it - there are no more constraints. Minimum radius curves? Using normal 32mm track provides instant gauge widening. May I check that my understanding of the dimensions you use for your own 0-XF layout is correct? TRACK: TG(Track Gauge): 31.0mm TRACK: CF (Crossing Flangeway): 1.0mm TRACK: CG (Check Gauge): 30.0mm According to Martin: 'Current "industry standard" wheels (Slater's, etc.): 29.2mm BB + 0.8mm max flange = 30.0mm BEF' Can you confirm this, especially the max flange thickness (max EF)? The reason I'm querying this is that a letter by Jim Snowdon in MRJ 122, 2000, referring to a then new GoG mailing re standards, specifically mentioning that Slater's wheels are of 0.75mm flange thickness. Your WHEELS include these Slater's, yes? Do you also run WHEELS constructed to amy other BB/EF dimensions? If so, what dimensions? (eg, Snowdon, MRJ 122, mentions Peco and Gibson wheels also having 0.75mm EF but a narrower 29.00mm BB.) Finally, perhaps you, or Martin, or someone else, can advise me of the TW dimension (Tyre Width aka Total wheel Width) of said 'industry standard / Slater's' wheels? (again, Snowdon, MRJ 122, mentions Slaters, Peco & Gibson wheels all being within the 3.5-3.8mm tyre with of the Guild Fine and BRMSB Fine profiles. ) Exact measurements would be nice to have. Regards, Rodney Hills |
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| Last edited on 29 Apr 2008 21:07 by rodney_hills |
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posted: 29 Apr 2008 22:07 from: Martin Wynne
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rodney_hills wrote: According to Martin: 'Current "industry standard" wheels (Slater's, etc.):Hi Rodney, Given the difficulty of measuring the effective flange thickness, and the fact that it is affected by the rail head profile, I don't think the difference between Jim's figure of 0.75mm and my figure of 0.8mm max is significant. The important dimension is BEF (Back to Effective Flange) which must not exceed 30.0mm max. Any variation in flange thickness can be accommodated by a corresponding adjustment to the Back to Back dimension to ensure BEF is not exceeded. regards, Martin. |
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posted: 30 Apr 2008 04:56 from: Brian Lewis
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Hi Rodney, Apologies for the delay in replying, I have been out for most of the day. I am running around like a dingbat at the moment, trying to get everything done before I go into hospital on Friday week. I see Martin has answered part of this. Thanks Martin. 1. Layout now 45 feet long, we have stitched in the tank farm end of the gasworks..... 2. Flange thickness is 0.75mm 3. Flangeway is 1.25mm. 4. All loco wheels are Slaters. I do have trialled samples number of other wagon wheels - Gibson, Haywood, Peco and (Shh, don't let on), S7. All go through 1.25 flange ways quite happily. BB is 29.2mm Regarding loco wheels, I do think there is merit in keeping to one make. That way you know what to expect. When I modelled in P4 I used Ultrascale exclusively and am happy to use Slaters in 7mm. Regards Brian Lewis |
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