Templot Club Archive 2007-2020
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posted: 7 Dec 2017 07:42 from: davelong click the date to link to this post click member name to view archived images |
Hi all, quick question. I'm planning to use a nickel silver baseplate below my common crossings. (P4) I've read that it's advisable that the Vee nose is slightly lower than the surrounding wing rails, but by how much is recommended? The reason for that question being the baseplate thickness available from Eileen's is either 18thou or 22thou thickness, and with using exactoscale chairs which I believe nominally hold the rail at 0.6mm above the timbers. Which would have the preferable height 0.45 (18thou) or 0.55 (22thou)? Many thanks. Dave |
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posted: 7 Dec 2017 11:02 from: Martin Wynne
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davelong wrote:I've read that it's advisable that the Vee nose is slightly lower than the surrounding wing rails, but by how much is recommended?Hi Dave, The prototype (bullhead) is typically 3/16" below the wing rails at the nose, running out in 15". In 4mm/ft scale that equates to 2.5 thou (0.06mm) running out in 5mm. It should be removed from the top of the vee when rounding and fettling the running edges at the nose. The bottom of the vee is level with the wing rails, 1.3/4" above the timbers for the chair base (0.6mm). regards, Martin. |
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posted: 7 Dec 2017 12:57 from: davelong click the date to link to this post click member name to view archived images |
Brilliant thank you Martin. | ||
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posted: 7 Dec 2017 16:40 from: Tony W
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Hi Dave. All I do when I have fabricated my Crossing Vees is to draw file along the top corner edges of the Vee with a VERY fine flat file to restore the radius to the edges of the rail profile. I find that where the two radii run into one another at the crossing nose produces enough of a reduction in the overall height to produce the subtle effect required. If you try to file down the top edge, you will probably overdo it. The reduction in top rail level at the Vee nose is there to cater for the coning of the tread as the flange moves away from the wing rail as it crosses the flangeway gap and drops slightly before being supported by the tip of the Vee. Regards Tony. |
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| Last edited on 7 Dec 2017 17:42 by Tony W |
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posted: 8 Dec 2017 10:20 from: davelong click the date to link to this post click member name to view archived images |
Thank you Tony, that's sounds a good idea. Regards Dave |
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