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Question

Why are the crease lines from a steel counter-based design split in a CFF2 export?

Answer

Assume a very simple design. Two panels separated by a crease with two bridges.

A snippet of an export to CFF2 will appear as follows:

L,2,1,0, 0, 0, 20, 0, 3, 0.1875
L,2,1,0, 20, 0, 20, 10, 2, 0.1875
L,2,1,0, 20, 10, 0, 10, 3, 0.1875
L,2,1,0, 0, 10, 0, 0, 2, 0.1875
L,2,2,0, 10, 10, 10, 0, 2, 0.1875 1 crease line with two bridges each with a width of .1875"

When a steel counter is created, the crease ends are cutback.

 

The crease is not actually shortened for design purposes.

   

But for production, the shortening manifests itself as bridges (bottom of rule) and nicks( top of rule): 

An export to CFF2 now looks like this:

L,2,1,0,0,0,20,0,3,0.1875
L,2,1,0,20,0,20,10,2,0.1875
L,2,1,0,20,10,0,10,3,0.1875
L,2,1,0,0,10,0,0,2,0.1875
L,2,2,0,10,10,10,9.922,1,0.078
L,2,2,0,10,9.922,10,5.078,1,0.1875
L,2,2,0,10,5.078,10,4.922,0,0
L,2,2,0,10,4.922,10,0.078,1,0.1875
L,2,2,0,10,0.078,10,0,1,0.078

There are now four additional crease lines.  Why because, the Crease cutbacks are considered bridges that differ in size from the originally specified bridges used to hold the rule in place. CFF2 only allows for one bridge width. The shortened crease has two bridge widths. The lines need to be split to conform to the CFF2 specification of one bridge width per line.

At first glance there appears to be two very small pieces of rule.  Examine the first and fifth crease line. The lengths are .078" which is equal to the bridge width which is further equal to the amount of the crease shortening.  They can be discarded.

Article information
Applies to

ArtiosCAD 12.1 and newer

Created24-Jan-18
Last revised 
Authorgsy
Case Number 
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