In AutoCAD computer graphics software, the 'cal command is an abbreviation for Calculator. Everyone may know that using the Calculator command to implement the calculator function, compared with other calculators, its calculator function is not very strong, and it is not convenient to use, so everyone is not very familiar with it, and not much used. However, if you use the 'cal' command for accurate drawing, it is convenient and fast, and it is a good way to increase the speed of drawing. Here are a few examples to demonstrate its powerful features. First look at the first example: There is a known line AB, which should be 60° from the horizontal (counterclockwise), and start at point C 50 mm from point A, and draw a CD straight line with the midpoint of AB, see Figure 1 .
figure 1
figure 2
If drawing according to the conventional drawing method, first make an auxiliary line AC that is 60° from the horizontal line from point A, and make AC=50mm, then find the midpoint D of the line AB, connect the CD, and then delete the auxiliary line. This completes the topic requirements. Specific practices are as follows: (Note: capital letters for the system commands or tips, lowercase letters for the operator's own input command, symbol "↵:" for the carriage return operation, the brackets for the operating instructions, the same below.) COMMAND: line ↵: FROM POINT: (use Shift + right-click pop-up menu, select Endpoint ↵: left-click pick up endpoint A TO POINT: @ 50 <60 ↵: (use the relative coordinates to find the C point) TO POINT: (use Shift + right-click pop-up menu, select Midpoint): Left click to pick the middle point of AB ↵ : COMMAND: e ↵ : SELECT OBJECTS: Click AC ↵ : (delete the auxiliary line AC) After the above six steps are completed to complete the drawing of the CD line shown in Figure 1. The cal command is much more convenient. Now let's take a look at the method of drawing a CD line using the 'cal command: COMMAND:line↵: FROM POINT:'cal↵: 》EXPRESSION:end + [50<60]↵: TO POINT: (Use Shift+Right-click pop-up menu to select Midpoint) Left-click to pick up the middle point of AB: As shown in Figure 2, suppose the outline and centerline are drawn to draw the inner frame ABCD. This is often encountered in mechanical drawings. To the problem, according to conventional methods, Calculate the coordinate value of point A to find the starting point of the drawing.To achieve this, you must first know the coordinate value of the intersection point between the center line and the outer frame, and then calculate the coordinate of point A. This method needs to calculate several coordinate values. Trouble, and there may be computational errors. If you use the 'cal' command, you can omit these steps and the drawing is very accurate. The specific way to plot with the 'cal' command is as follows: COMMAND:line↵: FROM POINT:'cal↵: EXPRESSION:int + [30<180]↵: TO POINT:(Use SHIFT+Right-click to popup the cursor menu, select the intersection point: Pick the intersection point between the centerline and the frame M TO POINT:@15<270 ↵: (Relative Coordinate AB Line) TO POINT: @60<0↵: (relative coordinate BC line) TO POINT: @15<90↵: (relative coordinate CD line) TO POINT: ↵: From the above 2 examples already known 'cal The role of the command, may have a preliminary understanding of its use.The following further explain the use of the 'cal command. The key to use the 'cal' command is to correctly enter the expression (Expression), the above two cases have different expressions Parameters, but they all have Same structure form: Reference point + [distance<angle] Reference point: A reference used to determine the starting point of the drawing line, which is generally a special point on the drawing, such as an endpoint, an intersection point, a circle center point, a center, a cut point, etc. Can be accurately captured with the capture function. Distance: The distance from the datum point to the starting point of the drawing line. Angle: refers to the reference point as the reference origin, the angle between the reference point and the starting point of the drawing line and the horizontal direction, clockwise is negative, counterclockwise is positive.
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