autocad precision
@zanetto wrote
<<...I measure it and i obtain 20,03...>>
Please explain what you mean by 'measure it?' If you select it, does the properties palette display the precision correctly? If you measure it using a dimension line then you'll need to change the precision in the Dimension Style.
Chicagolooper
And I would add: Describe exactly how you "draw a Line of 20." Do you float the cursor along, without Snap turned on, until the display says you're 20 units away, and then pick? Then it will be subject to the rounding in your units settings, so what you see will be rounded in display, and what you see may not be what you get. If you aim the cursor in the direction you want to go, and type in 20, or you type in a relative displacement for the second point, such as [if to the right] @Anonymous<0, he resulting Line should be exactly 20 units long.
@zanetto wrote:
I use dimension line to measure
I draw line starting from al old line and move the cursor in the diretcion i want till I see 20
As already pointed out, the displayed precision of numbers in Dimensions is a part of the Dimension Style definition, independent of the general displayed precision in the UNITS settings.
If you have UNITS displayed precision set to 0 [round to the nearest whole number], then you will "see 20" when the actual distance is anywhere from 19.5 to anything less than 20.5. That would be the cause of your problem.
I suggest you increase your displayed precision setting in UNITS [more decimal places], and draw with SNAP turned on except when there's specific reason to turn it off temporarily. And set SNAP to some value that's at least as large as your UNITS precision setting, e.g. if UNITS must be set to round things to the nearest whole number, set SNAP to at least 1 [but depending on the kind of work you do, you could set it to something like 5 or 10].
1. The value for "precision" with the units command or in the dimension style dialog box has nothing to do with the precision of the length you get when you create a line. Precision only affects the number of decimal places that you see for the length of the with properties, list and when adding a dimension line.
2. To have lines that you create while freehand clicking points on the screen be rounded to some base value (e.g., 1) you have several tools you can use.
a. Grids. Setting a grid to 1.0 and turning on grid snapping will snap all screen picks to the grid. This is useful primarily when drawing horizontal and vertical lines.
b. If you want to draw a line at a "nice" angle (e.g., 0°, 30°, 60°...) and have a length rounded to the nearest whole number use Polar Tracking with grid snap on the Polar Distance set to 1.0.
Try it!
@zanetto wrote:
.... How can I change snap precision?
Read about the SNAP command in Help.
