tic marks on blueprints?
06-17-2002, 12:18 AM
#1
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tic marks on blueprints?
what are the tic marks that are all around a set of plans actually used for? mine are spaced at 1/2 inch apart thanks
06-29-2002, 02:13 AM
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tic marks on blueprints?
Most often the Tic marks are there for reduction/enlargement reference. The plan may have been set up for microfilming. All too often the microfilm process is not exact. Your original at 1:1 is shrunk to 1/1000 of original size, and then via lens it gets enlarged and printed at 1:.998 and thus the machine needs adjustment, or you can only use the plan as reference. The cited dimensions hold in compared to measured distances. Thus a 48" long original plan may now measure 47.9" long. Off by 1/8" overall.
Wm.
Wm.
