Rail gauge tolerance

[Speedy Builder5Participant @speedybuilder5]

What are the standard tolerances for the distance between rails for 5 inch track ?

[Speedy Builder5Participant @speedybuilder5]

[Chris BParticipant @chrisb73862]

You could have a look on the GL5 website

 

http://www.gl5.org/

 

Hope this is of use

 

CB

[Speedy Builder5Participant @speedybuilder5]

Wow,  that is technical,  and not sure I understand it.  It states 5″ as the minimum width between rails,  and increasing on bends.  I could not read into that what the maximum could be, for straight or curves.

[Chris BParticipant @chrisb73862]

I did not spot a max figure for gauge widening on their site. My interest is 7 1/4″ and in the society standards they give a max widening of +1/8″, so somewhere around + 1/16″ should be OK for 5″.

 

CB

[WearyParticipant @weary]

5″ gauge maximum 5.09″  (or 129.3mm).

 

Source: Engineering in Miniature, Vol.15, number 8, January 1994, page 247;  Locomotive Wheel Profiles, author Dr. Martin W Baker

 

Doug Hewson gave similar limits (his max + 3/32 inch) in earlier articles, and gave the 5″ gauge widening for multi-gauge trackwork as 5 1/16 inch through the pointwork.

[Speedy Builder5Participant @speedybuilder5]

So in engineering terms  5 inch gauge is    5″ +0.090, -0.000  for straight and bends, opening to the high limit on bend sections,  however through points it should be 5″ +0.063, -0.000.

 

thanks  Bob

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