![]() Now, with CAD you are not limited to a certain paper size. Many times I've shaken my head watching a rookie operator going through all the trouble of scaling everything as if they were still drawing on a board. You had to figure out at what scale would you need to fit on the paper (or material) you selected. Before CAD, scaling questions needed to be considered because of paper size. Where it becomes more critical is when you affix a title block or text to your drawing. If you want millimeters draw millimeters. You can "truly" draw anything, no matter what size. If it's 1 inch long or 1 mile it's 1 unit. Always, I repeat ALWAYS draw at full scale. ![]() When you draw something at 1x1 unit that is what it is. Now, all that is easy to say but not easy to implement. What previous contributors have said is true about ACAD being unitless. Hopefully this makes sense and is what you are looking for and I hope I'm not confused in my thinking:)Ĭhris RE: AutoCAD units jerryjumpjet (Electrical) 2 Apr 02 16:36 by scaling it down it is still interpreting an inch, but it is and actual inch this time. Even if you draw that rectangle in decimal units, it gets interpreted as an inch. The way I understand it is your program interprets a unit in ACAD a an inch. ![]() If you scale it up, then you will have a rectangle 2540 inches square, which the prgram will also interpret as 2540 inches. Instead of scaling it up 25.4, I think you actually need to scale it by 0.03937 (1/25.4)įor example, if you want a rectangle 100mm x 100mm, draw it at 100x100 using decimal units, then scale it by 0.03937Īnd you have a rectangle that is 3.937 x 3.937 which you program should interpret as 3.937 inches. Now, if you have ADT, you can go into the drawing setup and change the "Drawing Units" to inches, mm, cm, whatever, and it will automatically change the drawing to display the correct units without having to scale it. If you are simply changing the units from Architectural to Decimal, then yes you will need to scale it (see below), because if you draw a rectangle 11"x7" and then change to decimal, you now have a rectangle that is 11.0x7.0 1-unit = 1-unit and you import into your program and is recognized as 11"x7" ![]() RE: AutoCAD units CarlB (Civil/Environmental) 29 Mar 02 03:52 I also want to determine my measurement units prior to creating a new file. I am not using DesignCenter Blocks, I have created my own text blocks and I am inserting those. The only indication of units is the "Drawing Units for DesignCenter Blocks: When inserting blocks into this drawing, scale them to -> inches, millimeters, (etc.)" I am also having problems with the UNITS command I cannot locate the global measurement change. Once I scale the line up by a factor of 25.4 then I have a line 25.4 INCHES long (which is 645.16 millimeters long). If I draw a line 1 inch long then I have already drawn a line that is 25.4 millimeters long. Should a drawing not be the same size regardless of measurement system? If I continually re-scale my drawing then I will encounter rounding errors that will alter the dimensions of the drawing. I do not understand why you need to scale a drawing to convert it to another measurement system? The above scenario indicates that when you scale a drawing you are changing the SIZE of the drawing not the UNITS. But if I have converted my drawing to millimeters why does the engraving program still register the drawing size as inches? I now import my text blocks into the drawing and then when I export the drawing as an AutoCAD 12 *.dxf file, to import into an engraving program, the other program sees a rectangle (with text blocks) that is 279.4 INCHES (not millimeters) wide by 177.8 INCHES tall. If I draw a rectangle in AutoCAD 2002 of size 11" by 7" and then convert it into millimeters (according to the above) it must be scaled up by a factor of 25.4. I am still having problems with this entire concept of scaling to convert measurement systems. ![]()
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