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Why OO-SF Standard?

00-SF v Peco

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This diagram shows the huge improvement in the appearance of the crossing (frog) when the narrower 00-SF flangeways are used. You can see from the orange areas how much the gap area in front of the vee is visually reduced. Although visually the reduction in the length of this gap is the most noticeable difference, it is the reduction in the width which brings about the big improvement in running quality. The width of this gap at its widest point must be less than the width of a wheel. It is then physically impossible for a wheel to "drop in" -- it remains fully supported on the rails as it runs through the crossing. All 00 wheels are wider than the gap for 00-SF. But many are narrower than the much wider gap in the Peco turnout, and bumpy running is inevitable as they run across the unsupported area.

 


 

The diagram above shows an A7 turnout in 00-SF, radius 53". This is typically the size of turnout which a modeller in 00-SF might use in place of a Peco Large Radius turnout, radius 45". Both turnouts are shown truncated to the mid-point of a crossover. In 00-SF double tracks are closer together at 45mm centres (as prototype) than for Peco at 51mm centres, so that although the 00-SF turnout is an easier radius than Peco, it is actually slightly shorter to the crossover mid-point. The 00-SF turnout has had the lead length to intersection adjusted slightly in order to match the Peco turnout exactly (purple line). This is a screenshot from Templot .


 

The diagram above shows the nearest exact match to a Peco Large Radius turnout. It has a GWR 10ft curved switch and a 1:6 curviform V-crossing. That's not a common size, it was generated simply to get as close as possible in 00-SF to the Peco dimensions.


 

The diagram above shows the same turnouts printed out as a track construction template. The difference in appearance of the 4mm/ft scale UK-style timbering for 00-SF is very noticeable.

diagrams © Martin Wynne 2008

 

The Gauges

16.2mm 00-SF Roller Track Gauges


C&L are now able to supply 16.2mm 00-SF Roller Track Gauges to aid track construction; the Gauges now include the provision of a milled "flat" at one end which aids their use during the construction of Turnouts etc. (The photo shows the earlier design by the late Russ Simpson without the flat.) The Gauges are sold in pairs and are held as a stock item. Please send me an email message if you are interested in purchasing these Gauges (see below for price information and contact details).

 

15.2mm 00-SF Check Rail Gauges



These Gauges are used during construction of Turnouts to correctly position the Check Rails with respect to the Crossing Vee. This is the most critical dimension in building pointwork and these Gauges should always be used to set the Check Rails. The Gauges are sold in pairs and are held as a stock item. Please send me an email if you are interested in purchasing these Gauges (see below for price information and contact details).

 

16.2mm 00-SF Three Point Track Gauges



These Gauges are used during construction of curved trackwork in order to introduce some degree of "Gauge Widening". The Gauges are usually sold in pairs (though I’m happy to accommodate the purchase of a single Gauge wherever possible) and are held as a stock item. Please send me an email if you are interested in purchasing these Gauges (see below for price information and contact details).

 

1.0mm 00-SF Crossing Flangeway Gauges



These Gauges are used during construction of Turnouts to correctly position the Wing Rails with respect to the Crossing Vee; each Gauge is a piece of ground steel gauge-plate 1mm thick (approx. 10mm wide; approx. 50mm long). The Gauges are sold in pairs and are held as a stock item. Please send me an email if you are interested in purchasing these Gauges (see below for price information and contact details).

Note: These Gauges must not be used to set the position of the Check Rails, the 15.2mm Check Rail Gauges should always be used for the Check Rails.

 

Please Note - the Crossing Flangeway Gauges are not currently available. We are having some made so they will be quite soon.


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