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peter ravenscroft02/08/2011 15:49:44
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hello
can anyone tell me the thickness of the fire bars it does not seem to be in issue 4409
i have worked it out to 2.5mm but do not know if this is correct
regards
peter
Weary06/08/2011 21:50:41
421 forum posts
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As no-one has replied to this.......
I make the thickness of each of the firebars 3mm.
Or as a not so good alternative 1/8" (one-eigth of an inch) if we stick to standard imperial sizes like the rest of the model.
 
Reasoning:
Length of 'shaft' which runs between two outer firebars is 3 7/16" (three and seven sixteenths inch). Shown top of drawings page 141.
Thirteen spacers 5/32" thick to be fitted = total thickness 2 1/32" (two and one thirty-second inch),
 
Leaves 1 13/32" (One and thirteen thirty-seconds of an inch), or 35.8mm of the 'shaft' to fill with 12 firebars - the two end firebars butt against the 'shaft'.
 
12 times 3mm thick firebars fill this almost exactly (0.2mm too bulky).
If each firebar is 1/8" thick then they occupy 1 1/2" (one and a half inches) and the firebars are 3/32" too bulky.... a bit of minimal and judicious thinning of the spacers should fix that!
 
Regards,
 
Phil

Edited By Weary on 06/08/2011 21:53:02

Edited By Weary on 06/08/2011 21:54:22

JasonB07/08/2011 08:02:56
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One problem with your maths there Weary. There are 14 bars not twelve.
 
Gives a bar thickness of 0.100" so 2.5mm if you can get it, or cut from 2.5mm plate but may be easier to use 3/32x3/8 section if you can find it and up the spacer thickness slightly.
 
Oh and while you are at it peter, the spigots on the ends of teh 1/4" dia spacer at the bottom of the drawing should be 1/8" dia as yoy cant turn them down to 5/16" dia!!
 
J
Weary07/08/2011 09:13:22
421 forum posts
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I repeat: The shaft runs between the outer two fire-bars; 
that is to say that the two outer fire-bars butt against the ends of the 'shaft'.
 
See drawing detail on right-hand side of 'drawing area' on page 141.
 
The outer two bars are retained by counter-sunk 5BA screws passing through them into the 'shaft'. The shaft runs between the inner sides of the outer firebars.
Thus only twelve bars are relevant.
*shrugs*

Edited By Weary on 07/08/2011 09:20:56

Edited By Weary on 07/08/2011 09:34:19

peter ravenscroft07/08/2011 12:16:14
100 forum posts
3 photos
thanks for the replies
i think i have found the problem the shaft should be 3 17/32" long making the the firebars 1/8th" thick everything then fits
i think are illustrious illustrater may have had 1 or 2 many oozo's
regards and thanks
peter
JasonB07/08/2011 12:50:52
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Sorry you are correct there are twelve between the ends of the bar, bit too early for me

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