Correct Nominal Radius of 00/HO Code 100 Peco large radius turn out

[sub39h]

Hi guys,

I'm using XTrkCAD to plan my layout. Whilst having a play I've noticed that the Peco large radius turn out on the programme seems to have a radius of 1254mm, but is listed on Peco's website as having a nominal radius of 1524mm? 

 

This is for SL-88/SL-89 turn outs. 

 

If XTrkCAD is wrong I don't suppose someone has the right file for Peco track they could send me? I've had a sneaking suspicion that they were wrong, and now I don't trust that any of them are right.

 

Thank you

[SwissRailPassion]

Is it a misprint?

[Dungrange]

I was always under the impression that the large radius turnouts were nominally five foot radius, so the 1524mm that you indicte is quoted on the Peco website sounds correct.  I've never used XTrkCAD, so I can't comment on its accuracy.

 

Regards

 

David

[martin_wynne]

Peco 00/H0 template files for Templot:

 

Templot is free, so you can download these files and print these templates:

Radius data from Templot:

 

external geometrical radius (substitution radius) = 1162.24mm  ( 45.76 " )

 

The substitution radius is the usual radius quoted as nominal.

 

If that radius is not what you expected, here is a screenshot showing plain track at that radius substituted over the turnout:

 

 

Other actual radii within the turnout curve:

 

turnout-road centre-line radius (at turnout-curve) = 1137.88mm
nominal switch-curve radius (rail gauge-face) = 2940.0mm  (straight switch)
turnout-curve radius (rail gauge-face) = 1146.13mm

internal geometrical radius = 1176.1  ( 46.3 " )

smallest radius on this template = 1138 mm ( 44.8 " )

 

Full data for entry in XTrackCad:

 

template generated at 01:36:44 on 21/05/2013 using Templot v:2.07.a
scale = 4.0 mm/ft     scale ratio = 1:76.2
track gauge = 16.5    flangeway gap = 1.5
template: straight
rail head only (bullhead): rails vertical
------------
LH turnout:
 1:35 Peco-only left-hand switch (unjoggled)
1 in 5.93 RAM  ( 1 in 5.97 CLM ) curviform V-crossing
square-on timbering
------------
adjacent track centres main side = 50.8
adjacent track centres turnout side = 50.8
angle at TXP crossover mid-point (CTRL-5) = 12.0 degrees ( 1 in 4.7 RAM )
angle at TVJP turnout road vee joint (CTRL-6) = 12.0 degrees ( 1 in 4.7 RAM )
------------
overall length = 258.0
approach/exit track in  45 ft rails / 19 sleepers per length ( rail length = 180.0 ):
approach track length = 0
exit track length = 0

turnout-road centre-line radius (at turnout-curve) = 1137.88

nominal switch-curve radius (rail gauge-face) = 2940.0  (straight switch)
turnout-curve radius (rail gauge-face) = 1146.13
switch-curve radial centre: X = [ -2855783.26 ]  Y = 99954211.68  (from CTRL-0)
turnout-curve radial centre: X = 18.83  Y = 1138.41  (from CTRL-0)

switch front (rail-joint to switch-toe) = 16.57
virtual lead (switch-toe to fine-point) = 192.92
actual lead (switch-toe to blunt nose) = 194.41
blunt nose to timber A = [ -0.65 ]
width of blunt nose = 0.25

wing rail reach length (main-side) = 18.0
wing rail reach length (turnout-side) = 18.0
check rail overall length (main-side) = 40.0
check rail overall length (turnout-side) = 40.0
------------
smallest radius on this template = 1138 mm ( 44.8 " )
total angular swing on this template = 0 degrees (in main road)
------------
nominal gauge :   00/H0    16.5  mm    4 mm/ft     1:76.2    00-Universal UK         
------------
template location on trackpad :

rotation :  X = 0   Y = 24.0   K = 0 degrees
   shift :  X = 0   Y = 0
rail-end :  X = 0   Y = 24.0

peg from origin :  X = 0   Y = 32.25   K = 0 degrees
peg from notch :  X = 0   Y = 32.25   K = 0 degrees


track centre-line radius at peg = straight
internal geometrical radius = 1176.1  ( 46.3 " )
external geometrical radius (substitution radius) = 1162.24  ( 45.76 " )
------------
 

Templot data files: right-click on the links and select Save Target/Link As...

Download: Peco 00/H0 Small Radius turnouts
Notes: Approximation to Peco 00/H0 Small Radius Turnouts (non-prototypical). Track centres 50.8mm (2"). Design includes a custom curved switch which is not recommended for any other use.

Download: Peco 00/H0 Large Radius turnouts
Notes: Approximation to Peco 00/H0 Large Radius Turnouts (non-prototypical). Track centres 50.8mm (2"). Design includes a 1:35 custom straight switch which is not recommended for any other use.

Sample printed template:

 

regards,

 

Martin.
 

[sub39h]

thank you all for your responses. looks like i need to make a new turn out to correctly plot the large radius turn out