Templot Club Archive 2007-2020
|
|||
| author | remove search highlighting | ||
|---|---|---|---|
|
posted: 21 Jan 2012 13:01 from: Phil O
click the date to link to this post click member name to view archived images |
Hi All I am setting up a GW crossing assembly and at the moment I am unable to find away to change the length of the V rail to correspond with David Smith's book on the subject. I have set out the timbering and got the wing and check rails correct but I am struggling to get an extra 12" or so to get the joints in the right place. I'm using the current TDV version. Cheers Phil |
||
|
posted: 21 Jan 2012 13:44 from: Martin Wynne
click the date to link to this post click member name to view archived images |
Hi Phil, Here you go: 2_210838_260000000.png  As with the wing rail front, Templot sets the length as the number of timbers spanned, at a fixed nominal spacing. Fine adjustment can be done by changing the final joint spacing, and then doing any timber shoving needed. Note that this setting affects the CTRL-6 and CTRL-8 peg positions. regards, Martin. |
||
|
posted: 21 Jan 2012 16:10 from: Phil O
click the date to link to this post click member name to view archived images |
Hi Martin I tried that before posting the topic. I have set the timbering to the correct spacings and using the ruler it shows the rail to be more or less the correct length (12ft) for a 4mm 1 in 6 GW 'Vee' but the joint mark is at the edge of the timbering, all timbering is set out as per the GW switch and Crossing practice book. See attached screen shot 38_211107_560000000.png  Cheers Phil |
||
|
posted: 21 Jan 2012 16:54 from: Martin Wynne
click the date to link to this post click member name to view archived images |
Hi Phil, Can you post the .box file so that I can see what's happening? Thanks. regards, Martin. |
||
|
posted: 21 Jan 2012 21:01 from: Paul Boyd
click the date to link to this post click member name to view archived images |
Hi Martin This one has puzzled me before, so have a .box file! I've taken the timber spacing from page 33 of said book. I'm wondering if it has something to do with not taking into account the angle of the timbers when calculating the spacing, but the rail joint definitely isn't 12ft from the intersection. Also, maths is most definitely not my strong point! It looks as if when Templot is adjusting the rail to span a set number of timbers, it isn't taking account of where those timbers are if they've been shoved. Cheers |
||
| Attachment: attach_1325_1796_GW_B6.box 236 | |||
|
posted: 21 Jan 2012 21:06 from: Martin Wynne
click the date to link to this post click member name to view archived images |
Paul Boyd wrote: It looks as if when Templot is adjusting the rail to span a set number of timbers, it isn't taking account of where those timbers are if they've been shoved.Hi Paul, It doesn't, and it's not intended to!  That would make the whole thing a nightmare to set up. I'll have a look at your .box file now. Thanks for posting it. regards, Martin. |
||
|
posted: 21 Jan 2012 21:42 from: Phil O
click the date to link to this post click member name to view archived images |
Hi Martin Here's my box file. Cheers Phil PS when using REA 'Vee' configuration IE 5 timbers under the 'V' with all timbers at the average spacing of the GW timbers plus 12 1/2" after the last one for the joint, the result is the same, as per the 'V' crossing options dialog boxes. |
||
| Attachment: attach_1326_1796_GW_1_in_6_turnout_10_ft_switches.box 231 | |||
| Last edited on 21 Jan 2012 22:06 by Phil O |
|||
|
posted: 21 Jan 2012 23:22 from: Martin Wynne
click the date to link to this post click member name to view archived images |
Hi Paul, Phil, Starting with Paul's file I made the following changes to match the GWR drawings: GWR blunt nose width is 11/16" (0.69") -- REA is 3/4" (0.75") (bullhead) GWR blunt nose to A timber centre is 3" -- REA is 4" (bullhead) GWR vee leg length is 12ft from the fine point FP. For Templot we need the vee leg dimension from the centre of the A timber, so for 1:6 angle that is 144" - 3" - 6 x 11/16" = 136.88" from the centre of the A timber to the rail joint. Spanning 5 timbers including the A timber itself, means we are spanning 4 spaces, so make the nominal spacing 31" to give a total of 4 x 31" = 124" to the nominal centre of the final timber. That leaves 136.88" - 124" = 12.88" to be entered as the final dimension to the rail joint. Now where the actual spacings are not 31", the timbers can be shoved to their correct positions. This won't affect the rails. The actual GWR spacings given from the A timber are: 31" (i.e. no shove needed), then 32", 32", 29.5", 25" (joint), 30". To be strictly accurate you should adjust these spacings slightly. The drawing shows them measured centrally to the vee angle, whereas Templot sets them square to the main road. 1:6 CLM is 9.53 degrees, half that is 4.76 degrees, so multiply those spacings by cos(4.76) i.e. by 0.9965. Not many modellers would go to that level of precision and be confident of building it. I also set a GWR B switch, generic type V-crossing and CLM angle. This gave the lead to fine point as 230.95mm on the model at 4mm/ft. The GWR dimension for a B-6 is 57'-9" = 231mm on the model, so that's a good result: 2_211749_370000000.png  Box file below. Note that I haven't looked at the wing and check rails or the wing rail front spacings -- over to you. regards, Martin. |
||
| Last edited on 21 Jan 2012 23:29 by Martin Wynne |
|||
|
posted: 21 Jan 2012 23:40 from: Martin Wynne
click the date to link to this post click member name to view archived images |
Here's the .box file (Sorry, I posted the wrong one earlier). |
||
| Attachment: attach_1329_1796_gwr_b6_for_paul.box 255 | |||
|
posted: 22 Jan 2012 19:29 from: Paul Boyd
click the date to link to this post click member name to view archived images |
Hi Martin Thanks for that detailed explanation. Like I said, maths isn't my strong point but I've worked through it and think I understand it. This is definitely one bit I'll be printing off for future reference - I'd never even considered changing the blunt nose width and the timber A distance from the blunt nose, but could immediately see the difference that made. It also gives me some new aspects of Templot to play with... ...and my GWR library box files to update  Cheers |
||
| Please read this important note about copyright: Unless stated otherwise, all the files submitted to this web site are copyright and the property of the respective contributor. You are welcome to use them for your own personal non-commercial purposes, and in your messages on this web site. If you want to publish any of this material elsewhere or use it commercially, you must first obtain the owner's permission to do so. |