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                 P4 gauge widening
     
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1st message | this message only posted: 25 Aug 2019 07:46
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from:
Hayfield
United Kingdom

 

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Some years ago I bought some Exactoscale P4 track gauges from C&L
Set 4XX TG02 are quite straight forward as they (4 in a pack) are standard 18.83

Set 4XX TG01 are for gauge widening, there are four in a pack and are as follows
1 x 18.83
1 x + 0.1
1 x + 0.2
1 x + 0.3

Sadly no instructions with the packs, I did make a note  as follows 
0.1  10'
0.2   6'
0.3   6'+

Clearly I have made an error in writing it, please can anyone put me straight as to which can be usede between what radii

Thanks

  

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2nd message | this message only posted: 25 Aug 2019 17:58
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from:
Jim Guthrie
United Kingdom

 

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Hayfield wrote: Some years ago I bought some Exactoscale P4 track gauges from C&L
Set 4XX TG02 are quite straight forward as they (4 in a pack) are standard 18.83

Set 4XX TG01 are for gauge widening, there are four in a pack and are as follows
1 x 18.83
1 x + 0.1
1 x + 0.2
1 x + 0.3

Sadly no instructions with the packs, I did make a note  as follows 
0.1  10'
0.2   6'
0.3   6'+

Clearly I have made an error in writing it, please can anyone put me straight as to which can be usede between what radii

BR applied 1/4" gauge widening to radii between 10 chains and 7 chains.
They applied 1/2" gauge widening on curves between 5.5 chains and 7 chains.
The applied 3/4" gauge widening on anything less than 5.5 chains.

So in 4mm,  1/4" widening - your 0.1mm - would apply to curves between a scale 7 chains and 10 chains,  which would be about 6' to 8' 8" radius.

With 1/2" widening - your 0.2mm - it would apply to curves  between a scale 5.5 chains and 7 chains which would be between 4' 9" and 6' radius.

For anything under 5.5 chains,  3/4" - your 0.3mm - would apply,  i.e. anything under 4' 9" radius.

The P4/S4 people may have rounded up or down to derive recommended radii for each step in gauge widening.

From my experience in S scale,  the only gauge widening that ever gets used is the scale 3/4" one. :)

Jim.

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3rd message | this message only posted: 25 Aug 2019 20:31
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from:
Rob Manchester
Manchester



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Hi John,

The gauges will be the ones that have a long piece of threaded rod with a central spacer tube and washers on the ends retained by nuts if I remember correctly. If your rails are canted at 1:20 make sure the gauges only hold the head of the rail as should always be the case.

I seem to remember from my P4 days that using 0.2mm on curves around 5 foot radius worked fine but it does depend on the type of stock, wheelbases and sideplay. Jim's post makes entire sense to me ( as usual :) ).

Oddly, I seem to remember SMP yard lengths of flexi track being sold in both 'normal' 18.83mm and a gauge widened version and I think the extra gauge was considerably more than the extra allowed by your gauges.

Rob


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4th message | this message only posted: 26 Aug 2019 07:36
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from:
Hayfield
United Kingdom

 

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Jim
Thanks for this information, I was hoping that someone may have the official P4 standards, seems to match what I have written by changing the + to a -

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5th message | this message only posted: 26 Aug 2019 07:40
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from:
Hayfield
United Kingdom

 

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Rob
The gauges are as you describe and are very useful when building chaired track, pity they are still not available

No idea about SMP doing a gauge widened flexittack

Exactoscale do 2 types of fast track bases
      4FT 101A8.50
      P4 gauge for BH rail (2 metres)

      4FT 102A8.50
      P4 gauge widened for BH rail (2 metres)


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