Templot Club Archive 2007-2020
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posted: 26 Jun 2009 10:16 from: Howard
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I'm using Templot 0.91.c on Windows XP. I'm struggling to make a transition curve from a 3" straight that enters my 4' by 2' baseboard 41.5 cm from the front edge and leaves via a 3" straight 175 cm from the other end (of the 4'). Sorry about the mixed measurements! This is 2mm/N Gauge. I first make a guess at a transition curve, using something between 24" and 36" radii, but then need to adjust it. I'd prefer to do this interactively without having to re-enter all the numbers. I cannot get <Shift><CTRL><F1> or the "-" key to do anything. No little window for changing the 1st trans. radius appears, and moving the mouse just moves the whole track plan. Likewise for the 2nd trans. radius. Using the menu option "action|transition radius options" also has no effect. Perhaps there is a better way to make my transition curve, but the inability to change the radii interactively seems to be a bug. Howard. |
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posted: 26 Jun 2009 10:58 from: Martin Wynne
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Howard wrote: Perhaps there is a better way to make my transition curve, but the inability to change the radii interactively seems to be a bug.Hi Howard, Use F6 to adjust the radii interactively. All about transition curves at: http://www.templot.com/martweb/gs_geometry.htm#transition From which: The transition radii are adjusted using the same adjust curving radius (F6) mouse action as for a fixed radius curve. To toggle between adjusting the 1st or 2nd radius, click the triangle symbol on the mouse action panel. Or select either of the adjust > transition radius options menu items (SHIFT+CTRL-F1 or SHIFT+CTRL-F2), or press the - (minus) or = (equals) keys for 1st or 2nd radius respectively. You can do this while the F6 mouse action is in force. regards, Martin. |
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posted: 26 Jun 2009 13:23 from: Howard
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Ah, got it. <SHIFT><CTRL>F1 or F2 toggle between the radii. F6 then changes it interactively. OK, but I'm still not clear how I line up a transition curve from one straight track to another. I could use a slew, but I thought that was for small changes - I need about 240mm slew in about 1050mm length. Howard. |
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posted: 26 Jun 2009 14:21 from: Martin Wynne
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Howard wrote: OK, but I'm still not clear how I line up a transition curve from one straight track to another. I could use a slew, but I thought that was for small changes - I need about 240mm slew in about 1050mm length.Hi Howard, You can't use a single transition curve, because such a curve must involve a change of radius. If both ends are straight they are both the same (infinite) radius. Slewing is the easier option. For 2mm/ft that's not really too severe as a slew -- I suggest you use a "mode 2" slew with the slew shape factor set to the default of 100. The minimum radius is then about 600mm (24"): slew_mode2_100factor.png  Admittedly it's not very prototypical to use such a large amount of slew. The proper approach is to use 3 separate transition curve templates. A central S-curve transition to create the reverse curves, and then an easement from the straight at each end. If you first create the easements at each end, you can then use the "make transition" function to link an S-curve between them. Before using "make transition" make sure to move the peg to the inner ends of the first templates, so that Templot knows which radii you want to transition between. Some trial and error may be needed to make sure the transition zones don't overlap. It's also much better to use the transitions option if you want to insert turnouts in them. I'll do a bit of video for you later. regards, Martin. |
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