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                                       Crossing angles
     
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1st message | this message only posted: 6 Apr 2018 15:32
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from:
Charles Warr
 

 

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I am planning to make a common crossing filing and assembly jig by milling grooves in a steel plate. In order to set the job at the correct angle on the miller I need to know the crossing angle expressed in degrees and minutes.
I had assumed that like road gradients back in the good old days the ratio would be one unit vertically for x units horizontally ie the tan of the angle. However reading Iain Rice's book "Finescale Track in 4mm" he shows a diagram which uses the sine of the angle. Actually there is almost no difference between the two eg 3 minutes for a 1:8 crossing but I might as well get it right. 
Assistance will be appreciated.
Regards
Charles

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2nd message | this message only posted: 6 Apr 2018 15:42
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Please do not send requests for help direct to me via email or PM.

Post your questions on the forum where everyone can see them and add helpful replies.
Charles Warr wrote: I need to know the crossing angle expressed in degrees and minutes.Hi Charles,





Templot uses RAM by default. More explanation here:

 http://85a.co.uk/forum/view_postx.php?post_id=2081

To convert the unit angles to degrees, for unit angle N:

RAM degrees = ARCTAN ( 1 / N )

CLM degrees = 2 x ARCTAN ( 1 / ( 2 x N ) )

You can use this trick in Templot:



Set a straight turnout, shift it onto the datum so that the rails are horizontal on the screen. Press CTRL-4 twice, and on the info panel (scroll it down) read the angle in degrees for the peg. To find a different angle, press CTRL-0 (zero), change the crossing angle as required and repeat the process.

For CLM equivalents, click real > V-crossing options > convert RAM to CLM menu item, and then do the above. e.g. 1:6 CLM = 1:5.96 RAM = 9.53 degrees.

To convert the fractional part to minutes, multiply it by 60, e.g.

for 9.53 degrees, 0.53 x 60 = 32.  result:  9deg 32min.

cheers,

Martin.

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3rd message | this message only posted: 8 Apr 2018 09:45
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from:
Charles Warr
 

 

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Hello Martin. Phew what a comprehensive reply. Useful to know that Templot uses RAM by default. Many thanks. Regards Charles
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