Rob Roy chimney position

Rob Roy chimney position

This topic has 3 replies, 2 voices, and was last updated 1 September 2020 at 10:24 by Anthony Taunton.

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30 August 2020 at 17:47 #493456
Anthony Taunton
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@anthonytaunton43819
Looking at the Rob Roy drawings, and about to bore my smokebox, it appears that the longitudinal position of the centre of the chimney/petticoat pipe is not shown. Scaling off the drawing with dividers it appears to be half way along the smokebox, so 1.1875". However, the smokebox door ring is 5/16" deep, and the drawing shows the bottom of the 1.5" diameter chimney flange co-incident with the rear edge of it. This makes the chimney flange 9/16" from the rear of the smokebox i.e not in the middle. No direct dimension is shown.
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30 August 2020 at 17:47 #1958
Anthony Taunton
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@anthonytaunton43819
30 August 2020 at 20:07 #493474
Baz
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@baz89810
Sorry I cannot give you a dimension but the chimney must be in line with the blast pipe which originates from the centre of the cylinder so I would suggest a bit of measuring off the job itself. Martin Evans never seems to give the dimensions that you need.
1 September 2020 at 10:24 #493658
Anthony Taunton
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@anthonytaunton43819
Thanks for your reply Baz. All sorted now, thanks for your help.
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