When you change the first arrowhead type, the second arrowhead automatically changes to match it.DIMBLK1 system variable).Select the name of a user-defined arrowhead block.The block must be in the drawing.).
For DIMDIAMETER and DIMRADIUS, the center mark is drawn only if you place the dimension line outside the circle or arc. The size of the center mark is stored as a positive value in the DIMCEN system variable. Typically the actual measurement is smaller than the desired value. Start off with this exercise to introduce AutoCADs dimensioning functionality by creating linear dimensions that show the horizontal or vertical distance between two endpoints. It saves lazy writers from having to duplicate our instructions for metric users. Make the line about 6 units long, at an angle of about 30 degrees upward to the right. You normally have dedicated layers for visible edges, hidden edges, text, dimensions, section lines, hatching, and so on. It draws a vertical dimension (the length of the displacement in the up-and-down direction) if you move the crosshairs to the left or right of the line. Rather, you want the dimension line and text to sit in a relatively empty part of the drawing rather than have it bump into existing objects. If necessary, temporarily turn off running object snap (for example, click the OSNAP button on the status bar) to avoid snapping the dimension line to an existing object. You can also use the DIMSPACE command to select several existing dimensions and then automatically space them equally. Not a problem. AutoCAD controls the look of dimensions by means of dimension styles, just as it controls the look of text with text styles and tables with table styles. AutoCAD has about 80 variables that can be used to warp dimensions into just about any perversion that your industry or company can imagine. David Byrnes began his drafting career with a pencil and T-square. He taught AutoCAD for 15 years, and authored five previous editions of AutoCAD For Dummies.
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