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- UNIT Menu: SCRN
- ==============================================================================
- Changes the working unit and sets other associated parameters.
-
- 1. (CHAR) NEW unit: m-meter, c-centimeter, l-millimeter, f-feet
- if `m', `c', or `l' are selected:
- 2. (NUM) metric dimensions format (10-13, 20-23, 30-33, 43, 44)
- <curr. format>
- if `f' is selected:
- 2. (CHAR) x,y,z display format (1,2,3,4,5) <curr.format>
- 3. (CHAR) scale display format (1,2,3,4,5) <curr.format>
- 4. (NUM) feet dimensions format (-10,-11,-12,-20,-21,-22,-23,-30)
- <curr.format>
- for all units:
- 5. (NUM) solid tolerance (range in current unit) <curr.tolerance>
- 6. (NUM) reference scale (0.01-100000) <curr.ref.scale>
- 7. (NUM) size of arc segment in ref. scale 1: curr. ref. scale
- (range in current unit) <curr.arcsize>
- 8. (NUM) minimum and maximum number of segments in an arc
- (range: 5-500) <curr.range>
- if grid is on:
- 9. (NUM) grid interval (min. value in curr. unit , 0-to switch off)
-
- Description
-
- This command changes the working unit and sets all the parameters associated
- with it.
- Enter the new working unit. The options are meters, centimeters, millimeters
- or feet.
-
- If meters, centimeters or millimeters are selected, enter the format code for
- the metric dimension.
-
- Format codes greater than 0 indicate that the units are metric. The first
- digit represents the specific unit `1' for meters, `2' for centimeters, `3'
- for millimeters. The second digit represents the number of digits appearing
- after the decimal point. Format codes 43 and 44 display the dimension text in
- meters, with the millimeters (and mm in format 44) typed in superscript.
-
- The following table shows how a metric dimension is displayed using the
- various format codes:
-
- Format Value
- Code (in meters) Text
-
- 10 1.234 1
- 11 1.234 1.2
- 12 1.234 1.23
- 13 1.234 1.234
- 20 1.234 123
- 21 1.234 123.4
- 22 1.2345 123.45
- 23 1.23456 123.456
- 30 1.23456 1234
- 31 1.23456 1234.6 (rounded up)
- 32 1.23456 1234.56
- 33 1.234567 1234.567
- 43 1.234 1.234
- 44 1.2345 1.2345
-
- If feet are selected, define the display format for the x,y,z values line and
- the scale on the top screen. There are 5 format options:
-
- 1 Feet in decimal format, e.g., 1.5'.
- 2 Feet and inches, with inches in decimal format, e.g.,1' 6.5".
- 3 Feet and inches, with inches in fraction format, e.g.,1' 6-" (accuracy to ").
- 4 This format is the same as option 3, but if a higher degree of accuracy
- is necessary, option 1 is selected by the program.
- 5 This format is the same as option 3, but if a higher degree of accuracy
- is necessary, option 2 is selected by the program.
-
- Note that a metric scale of 96 (1:96) will be displayed as '.
-
- Enter the dimensions format code. Format codes less than 0 (i.e., with a
- preceding `-') indicate that the units are feet and inches. The first digit
- represents the presentation mode `1' for feet/decimal feet, `2' for
- feet/inches/decimal inches, or `3' for feet/inches/fractional inches. The
- second digit represents the number of digits appearing after the decimal point
- (if any). When working in metric units the default code is `13'. When
- working in feet the default code is `-30'.
-
- The following table shows how an imperial dimension is displayed using the
- various format codes:
-
- Format Value
- Code (in ft/inch) Text
-
- -10 1' 7-" 2'
- -11 1' 7-" 1.6'
- -12 1' 7-" 1.64'
- -20 1' 7-" 1' 8"
- -21 1' 7-" 1' 7.7"
- -22 1' 7-" 1' 7.68"
- -23 1' 7-" 1' 7.683"
- -30 1' 7-" 1' 7-"
-
- For all units, enter a value for solid tolerance. The range, displayed in the
- current unit, is 0.00001-0.1 meters. This value sets the tolerance accuracy
- for various calculations and represents the length of an entity line which
- will be effective in the system operations. Lengths shorter than this value
- will be ignored, e.g., in operations like union, subtraction, hidden lines
- removal, etc. Unexpected results may occur if entities requiring fine
- tolerances are included in files containing many large entities (requiring
- larger tolerances) and vice versa.
-
- Enter a value for the reference scale. The range is 0.01-100000. The
- reference scale is the scale at which text and other scalable entities
- (dimension text, linear patterns) will appear at their originally defined size
- (real size = specified size x reference scale). It is set in the \tscrn
- command. Initially the default in the geometric module is 1:100 and in the
- Drawing Sheet Generator module (DSG) to 1:1. (In the DSG it should not be
- changed.)
-
- Enter a size for arc segments. The range is 0.0003-1 meters and is displayed
- in the current unit. Then enter the minimum and maximum number of segments in
- an arc. The range is 5-500. (See \sarc).
-
- If the grid is on, the current grid interval will be displayed on the input
- line in the new unit. Enter a new interval if required or press <ENTER> to
- accept the current values. Zero will turn the grid off.
-
- NOTE: To change parameters individually, see \sarc, \grid, \ngrid, \adim,
- \tscrn, \tol.