Enfield Barrel Drawings?

[Paul S.]

... he could take the dimensions off the take-off barrel I supplied, my concern is that if he uses one barrel, well ... you have the dimensions from one barrel. I've no idea how close the barrel is to the factory spec, hence my interest in getting drawings over to him. ...

Bruce's reply above offers the best information from the machinist's perspective - and you have to love it when a true professional speaks.

Looking at your problem historically from a draughting perspective, current geometric dimensioning and tolerancing is a comparatively recent innovation. The first nationally coded draughting standard, BS308 didn't come into effect until 1927! From all evidence, early 20th century mass-production manufacturing depended very much upon either 'try and fit' or hand-fit. That meant you had a box full of parts 'A' and another box full of parts 'B', etc. You'd take a part 'A' and try parts 'B' until one fit. The odd bits were set aside and hand-fitted if need be. That said, using a new made component produced using nominal dimensions would be essentially what occurred at least until the middle of WWII.

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