Autonumbering Title Blocks in AutoCAD

Several people seem to have had this problem (going by the number of posts on the internet about it), but I didn't really find a satisfying solution.  After spending half a day on the problem, I think I have come up with something useable.

First, lets outline the problem:  Normally, along the top of a title block we have a column numbers (for referencing purposes).  Say there are 20 columns per drawing.  In a multisheet drawing, we want the first sheet to go from 1 to 20, the second from 21 to 41 and so on.  You can do this easily by editing your block each time and changing the numbers, but this is tedious...

Solution:
First we need to create a table for our column numbers.  My title block is 400 units wide, so I have a table 400 wide, with one row and 20 columns of 20 units each.  In the second column, enter the formula "=A1 + 1".  Drag this across all the columns so each one increments from the previous cell (so now you should have a blank first cell, then 1 to 19 in the others).autocad-autonum3

Now for the magic: in cell A1, enter "=(1-1)*20+1", however in place of the first "1" (the one in red) insert a field, of type DieselExpression, with value

    $(if,$(eq,$(substr,$(getvar,ctab),1,1),"#"),$(substr,$(getvar,ctab),2,2),1)

This expression looks at your layout name (the name on the tab for the layout) and checks if the first character is "#".  If it is, then it assumes the next two values are the number of the sheet.  If not, it just returns 1.autocad-autonum2

So all we have to do is make sure our Layout is named with #xx at the start (replace xx with the sheet number), and our title block will auto number itself! (Might need to use regen to update the numbers).

autocad-autonum1

| March 18th, 2014 | Posted in Software |

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