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PostPosted: Sat Feb 03, 2018 12:43 am 
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I was looking for some ogee to match existing and came across "Timber Architrave Ogee Best Pattern 52 25mm x 63mm (Finished Size) 20mm x 57mm". Does this mean when I put a measure against it I'll see 20mm and 57mm? If so, why mention the first set of dimensions??

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PostPosted: Sat Feb 03, 2018 12:56 am 
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52x25 is prefinnished inch stock size so about minus 6 and 3mm or less [45x21mm]

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PostPosted: Sat Feb 03, 2018 1:15 am 
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Ah, so "25mm x 63mm (Finished Size) 20mm x 57mm" means they took a 1" x 2½" stick and carved it down to 20mm x 57mm. Begs the question: why do I need to know what they started with?

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PostPosted: Sat Feb 03, 2018 1:33 am 
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because historically the datum point is what its made from as in pre worked stock size
you need a datum point a uniform point to measure from to keep things the same
if you dont work to the same measurements or standards you cannot compare like for like

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PostPosted: Sat Feb 03, 2018 11:49 am 
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By making both the real and "stock" sizes clear it saves any confusion. :?


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