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Search results for: clm_angle_diagram.png
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... 21:36 from: Martin Wynne Brian Tulley wrote: I don't understand the term RAM, by the way Hi Brian, RAM= Right Angle Measure= Templot default and some Continental European prototypes: ram_angle_diagram.png RAM unit angles are traditionally used by modellers because they correspond with normal engineering practice and are easily set out with dividers -- all measurements are either along the rail or at right-angles to it. Templot uses RAM angles by default for this reason. CLM= Centre Line Measure= most US and UK prototypes: clm_angle_diagram.png Measurements are made along an imaginary centre-line between the vee rails, and at right angles to that centre-line. Neither measurement is along the rail. It's easy to do on the ground with gauging tools which fit across the rails, but more difficult on a drawing board. CLM unit angles are used because the rules-of-thumb formulae which are used by the p.w. gang when setting out pointwork on the ground are simplified, and produce closer approximations to the true mathematical result. Nowadays with everything ...
... :37 from: Martin Wynne JimH wrote: If I'm building my own track according to a plan created under Templot, is it possible to use the pre-milled vees and other components from the track supply companies at the corresponding 1:6, 1:7 angles etc.? Hi Jim, Yes, sure. The angle numbers mean the same in Templot as those used by suppliers. Templot uses RAM unit angles, like this for 1:6 ram_angle_diagram.png Some suppliers may use CLM angles instead, like this: clm_angle_diagram.png It makes a slight difference to the overall length of a template, but for the individual components such as a crossing vee the difference is insignificant. Note that if you are buying complete assembled crossings (frogs), you should make sure that the flangeway standards set in Templot correspond to the flangeway on the components being supplied. regards, Martin. Parts of Templot Club may not function unless you enable JavaScript (also called Active Scripting) in your browser. Templot Club> Forums> Templot talk> Pre-milled crossing ...
3. Frog Angles
... as #7, especially in the USA). There are two common ways of measuring the ratio: 1. RAM= Right Angle Measure= Templot default and some Continental European prototypes: ram_angle_diagram.png RAM unit angles are traditionally used by modellers because they correspond with normal engineering practice and are easily set out with dividers -- all measurements are either along the rail or at right-angles to it. Templot uses RAM angles by default for this reason. 2. CLM= Centre Line Measure= most US and UK prototypes: clm_angle_diagram.png Measurements are made along an imaginary centre-line between the vee rails, and at right angles to that centre-line. Neither measurement is along the rail. It's easy to do on the ground with gauging tools which fit across the rails, but more difficult on a drawing board. CLM unit angles are used because the rules-of-thumb formulae which are used by the p.w. gang when setting out pointwork on the ground are simplified, and produce closer approximations to the true mathematical result. Nowadays with everything ...
... as #7, especially in the USA). There are two common ways of measuring the ratio: 1. RAM= Right Angle Measure= Templot default and some Continental European prototypes: ram_angle_diagram.png RAM unit angles are traditionally used by modellers because they correspond with normal engineering practice and are easily set out with dividers -- all measurements are either along the rail or at right-angles to it. Templot uses RAM angles by default for this reason. 2. CLM= Centre Line Measure= most USA and UK prototypes: clm_angle_diagram.png Measurements are made along an imaginary centre-line between the vee rails, and at right angles to that centre-line. Neither measurement is along the rail. It's easy to do on the ground with gauging tools which fit across the rails, but more difficult on a drawing board. CLM unit angles are used because the rules-of-thumb formulae which are used by the p.w. gang when setting out pointwork on the ground are simplified, and produce closer approximations to the true mathematical result. Nowadays with everything ...
... 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 posted: 6 Apr 2018 16:42 from: Martin Wynne Charles Warr wrote: I need to know the crossing angle expressed in degrees and minutes. Hi Charles, ram_angle_diagram.png clm_angle_diagram.png Templot uses RAM by default. More explanation here: message 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: peg_ram_degrees.png 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 ...
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