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ME 4415 - Darjeeling B Class

Smokebox Pipe Plate dimension

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Steambuff22/10/2011 15:15:16
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544 forum posts
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Can someone please confirm the dimensions on the Smokebox Pipe Plate drawing.
 
According to the drawing there is a 8BA clearance hole between the 5/16" and the 1/4" holes.
 
The center to center dimension between the 1/4" and 8BA hole is give as 11/64" .... now if my maths is correct this only leaves approx 1/256" between the two holes. (No room for the head of a bolt/screw/rivet)
 
8BA clearance = 2.2mm = 0.086" =11/128 ... (radius = 11/256")
11/64" - 1/8" (radius of 1/4" hole) = 3/64" = 12/256"
12/256" - 11/256" = 1/256" (approx 4 thou)
 
Is this correct .... seems a bit too close to me.
(On the drawing it appeas that it should be approx 5/16" - Mid point between the 2 centers)
 
Dave
 
 
Donald Mitchell23/10/2011 10:10:47
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90 forum posts
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Hi Engineers,
 
I have spoken to Raymond this morning and he confirms that he has no idea where the 11/64 dimension has come from; the 8BA hole is simply placed mid-way between the 1/4 and the 5/16 holes where it will be very happy.
 
Donald Mitchell
Bonnie Scotland
Steambuff23/10/2011 10:18:22
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544 forum posts
8 photos
 
Thanks Donald/Ray.
 
I have just checked the drawings, that I purchased from Blackgates .. and it is there as well.
 
Dave
 

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