Problems with holes in cladding

This topic has 2 replies, 3 voices, and was last updated 9 April 2026 at 20:58 by Dave Halford.

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7 April 2026 at 12:49 #843569
Michael Callaghan
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@michaelcallaghan68621
Hi. Can anyone help. I am trying to correctly locate the many mounting holes on my 3 1/2 inch Columbia. The drawings are next to useless giving measurements that to me bear little in common with pictures of the locomotive model.

so far I have cut out the safety valve holes and any others on the centre line of the boiler. I used heavy mounting board card to start the template for the cladding. And now I am lost. The drawings show measurements for the mounting hold positions from the top of the boiler cladding, but if I draw them on the template it would make the outside regulator control only an inch from the top of the boiler, so a total mismatch.

can anyone please explain how to get the holes in the right position. Thanks
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7 April 2026 at 12:59 #843575
bernard towers
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@bernardtowers37738
Cant you wrap with paper and rub holes with a dirty hand
9 April 2026 at 20:58 #843928
Dave Halford
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@davehalford22513
The thickness of metal cladding + insulation cladding and 22/7 x the resultant increased diameter should enable you to work it out, however it will be easier to use Bernard’s suggestion over the wood cladding.
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Problems with holes in cladding

Problems with holes in cladding

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