Templot Club Archive 2007-2020
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posted: 24 May 2007 13:55 from: Richard Lambert click the date to link to this post click member name to view archived images |
Hi there I am about to embark on the build of a fairly extensive 7mm scale layout. It is going to be built to 31.5mm gauge. Unfortunately, I have not found anyone who makes suitable gauges. Question. Does anyone know of a source for 31.5mm gauges? If not, I have found someone who can make them, but who wants clear instructions as to what is required. Is there a set of standard (!) specifications set out somewhere that I can forward? Thanks Richard Lambert |
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posted: 24 May 2007 17:09 from: Templot User
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=== from Brian Lewis === Not 31.5mm Richard, but we do stock 31.00mm track gauges. My own layout is to this gauge and it works like a dream...... Regards Brian Lewis Carrs - C+L Finescale http://www.finescale.org.uk Tel: +44 1 275 852 027 Fax: +44 1 275 810 555 |
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posted: 24 May 2007 17:24 from: Martin Wynne
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Hi Brian, Richard, > Not 31.5mm Richard, but we do stock 31.00mm track gauges. The Gauge 0 Guild suggestion/recommendation is 31.2mm track gauge. This is available in Templot as 0-SF in later versions, and can be easily set up as a custom gauge in earlier versions. (31.5mm is available as 0-MF, 31.0mm is available as 0-XF in all versions.) Note that changing the track gauge has an effect on the lead length of turnouts and diamonds. You can change an existing track plan using the "convert group" button on the scale/gauge list dialog, but this may require some template alignments to be re-worked. regards, Martin. |
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posted: 24 May 2007 19:13 from: Templot User
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=== from Brian Lewis === Well this is why you are going to struggle to find track gauges.............. There was a perfectly workable OX-F standard of 31.00mm. Why others thought that 31.2mm or 31.5mm should be added as alternatives is totally beyond me. Quite barmy.................. Regards Brian Lewis Carrs - C+L Finescale http://www.finescale.org.uk Tel: +44 1 275 852 027 Fax: +44 1 275 810 555 |
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posted: 24 May 2007 19:29 from: Martin Wynne
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Hi Brian, > Why others thought that 31.2mm or 31.5mm > should be added as alternatives is totally beyond me. 31.0mm works fine with current "industry standard" wheelsets, e.g. Slater's. But problems have been found with older rolling-stock and makes of wheel. 31.2mm eases the gauge just enough to accomodate such wheels without losing the advantages of a gauge reduced from 32mm. The matter of track gauge is also closely bound up with radius. 31.5mm offers improved running over 32mm, but still allows the tight curves which some modellers are forced to use. The important point to note is that all these gauges use the same wheels, and the track gauges can therefore be mixed on the same layout, according to circumstance and location. 0 gauge is often used in the hostile maintenance environment of a garden railway, and it's not always wise to adopt the tightest possible standards in such a situation. regards, Martin. |
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posted: 25 May 2007 19:11 from: Richard Lambert click the date to link to this post click member name to view archived images |
It's quite simple Brian. I run a large amount of stock with differing wheelsets - Slaters, Gibson, HOG, Haywood, Easy-Build, Peco. Since the layout incorporates a relatively high speed run through pointwork, I have to guarantee no derailments, both from mine and visiting stock. 31.00 cannot do this. Since I want something better than 32.00, and since I am building it, I might as well go down either a 31.2 or 31.5 route, either of which would be an improvement on 32.00. Rightly or wrongly, I have gone for 31.5mm. Still back to the original question - what specifications do I need to pass on to my gauge maker) In any event, there must be others in the same boat??? Richard |
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posted: 25 May 2007 20:27 from: Martin Wynne
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Hi Richard, > I have gone for 31.5mm. Still back to the original > question - what specifications do I need to pass on > to my gauge maker? I suggest you use the dimensions given for 0-MF in Templot -- 31.5mm gauge with 1.5mm flangeways. This gives a CG of 30.0mm min, a convenient round figure to remember and work with. The critical dimension in trackwork is this check gauge CG. This must be greater than the BEF dimension for the wheelset (back to effective flange). For G0G-Fine (32.0mm gauge) the CG is 30.25mm min. For 0-SF (31.2mm) it is 29.75mm min. 0-MF (31.5mm gauge) splits the difference at 30.0mm and is a good compromise for use with the widest possible range of wheels. It allows for a flange thickness up to 1.0mm for wheels set to 29.0mm back-to-back. For "industry-standard" wheels at 29.2mm back-to-back, flange thickness can go up to 0.8mm max. Check span is 28.5mm matching G0G-Fine, allowing a good clearance under BB on sharp curves, and a practical tolerance up to 28.6mm. The 1.5mm flangeway plus prototypical 3/4" blunt nose gives a minimum wheel width for full support at crossings of 3.4mm compared with the G0G-Fine minimum wheel width of 3.5mm. In summary, your track gauge tools need to produce track as follows. It is always preferable to have a check gauge tool separate from the track gauge tool, and to set the crossing flangeway (but not the check rail flangeway) with a suitable feeler gauge or precision shim. track gauge 31.5mm minimum check gauge 30.0mm minimum check span 28.6mm maximum crossing flangeway 1.5mm maximum For the manufacture of such tools you should be able to set a permitted machining tolerance of 0.03mm away from these figures, and you will need to measure the rail-head width of your widest rail to fit the tool slots. Prototypically in should be 2.75" scale (1.6mm), so a slot width of 1.6mm min at least. I hope this helps. You may find similar discussions and gauge tool drawings on the 00-SF group helpful: http://groups.yahoo.com/group/00-SF regards, Martin. |
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posted: 25 May 2007 20:45 from: Martin Wynne
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p.s. I wrote: > For 0-SF (31.2mm) CG is 29.75mm min. I have taken that figure from the dimensions published by the G0G for 0-SF, but I can't help feeling that it is a mistake, and should be 29.95mm min. At 29.75mm CG min and 29.2mm back-to-back, the maximum allowable flange thickness would be only 0.55mm, which is less than the flange thickness shown for the "industry-standard" wheelset, of 0.75mm. Martin. |
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posted: 25 May 2007 21:28 from: Templot User
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=== from Brian Lewis === Richard, I was not getting at you personally - it just seems extraordinary that there are no less than three standards. This is certain to cause confusion and dilute the advantages of the narrower track gauge. You are right - some of the 'clunky' wheels - Walsall, etc. will not go through 31mm trackwork easily. I was going to give you some specs to work on, but I see young Martin W has beaten me to it. Regards Brian Lewis Carrs - C+L Finescale http://www.finescale.org.uk Tel: +44 1 275 852 027 Fax: +44 1 275 810 555 |
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posted: 25 May 2007 21:42 from: Martin Wynne
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Hi Brian, > it just seems extraordinary that there are > no less than three standards. I don't see a problem -- it gives folk a choice. It's important that WHEELS are standardised. But track is built in the privacy of your own workshop and doesn't need to be interchangeable with anyone else's. Modellers can choose an existing track standard which best suits their rolling-stock, radii, and layout circumstances, or maybe invent a new standard of their own. 0-MF at 31.5mm gauge improves running quality and appearance over 32mm gauge for the widest possible range of wheels. It could well replace 32mm as the common standard for all but the sharpest industrial turnouts and curves. regards, Martin. |
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posted: 25 May 2007 21:48 from: Templot User
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=== from Brian Lewis === Regarding the tight curves Martin, many folk seem to confine 31mm to the pointwork and continue to use 32mm for plain track. I tried this on a section of my own layout as a test - the transition from 31mm to 32mm being as short as 6 sleepers. It is quite unnoticeable to the eye and the stock performs faultless over the transition. Regards Brian Lewis Carrs - C+L Finescale http://www.finescale.org.uk Tel: +44 1 275 852 027 Fax: +44 1 275 810 555 |
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