The correct way to view CAD drawings
Do mechanical equipment, for the set of drawings:
1, first look at the general assembly diagram, to understand the purpose of the equipment;
2, look at the parts assembly diagram, to understand what are the important parts, and the relationship between the parts; (for the back faster to understand the parts diagrams to do the preparations!)
The following to the parts diagram:
1, first look at the title bar, to understand what parts, in what part of the equipment? What role? What is the material?
2, and then look at the technical requirements, be sure to look at the technical requirements, know the processing, heat treatment, inspection and other requirements, as well as compliance with which technical specifications. (At this point, encountered their own do not understand the technical specifications should first go to see the technical specifications!)
3, look at the parts view, understand the structure of the parts, what are the key positions, benchmarks, roughness, shape and location requirements. (To be able to design and judge whether these requirements are reasonable, it requires you to have a certain machining arts experience!)
CAD Tutorial: Graphics Editing and Modification
1. Graphics Displacement
① Move Graphics: Executed by selecting Modify/Move, or by clicking the Move button, or by typing move on the command line. You can pan one or more objects to a new location, which is equivalent to deleting the copy and paste of the source object.
② Rotate the drawing: Select Modify/Rotate, or click the Rotate button, or enter rotate on the command line to execute. You can change the direction of the object and position it in the new direction at the specified base point and angle. Generally speaking, in the move and rotate commands, the designation of the base point needs to be completed in conjunction with the object snapping function, and the base point is some point with a special position.
2. Graphic modification
① Delete the graphic: by selecting the modify/delete command, or click the delete button, or in the command line, type erase to execute. After selecting the delete command, the cross cursor on the screen will become a pickup box, select the object to be deleted, press enter. The fastest way to delete, first select the object, and then call the delete command or press delete. In addition, you can also use the cut to clipboard method to delete the object.
② Stretch graphics: You can stretch the selected part of the object, not selected part of the object remains unchanged. When using the Stretch Graphics command, the part outside the graphic selection window will not have any change; the part inside the graphic selection window will move with the graphic selection window, but there will be no change in shape. Choose the Modify/Stretch command, or click the Stretch button, or type stretch on the command line to execute it. Objects to be stretched must be selected with a cross-window or cross-polygon.
③ Stretch Graphics: You can stretch selected objects to a specified boundary. You can extend lines, rays, arcs, elliptical arcs, and non-enclosed polylines over specified lines,, rays, arcs, elliptical arcs, polylines, construction lines, and regions. This is performed by selecting the Modify/Extend command, or by clicking the Extend button, or by typing extend on the command line. Extendable objects must be objects with endpoints, such as straight lines, polylines, etc., but not objects without endpoints, such as circles, reference lines, etc. The first is to specify the extension of the boundary and then select the object to be extended
④ Trimming graphics: you can select the object in the specified boundary side of the part of the cut off. The objects can be trimmed include: straight lines, rays, arcs, elliptical arcs, polylines, construction lines and spline curves. Valid boundaries include: straight lines, rays, arcs, elliptic arcs, polylines, construction lines and filled areas. The first is to select the cut edge and then select the trimming object
⑤ Interrupt Graphics: Used to interrupt the selected object, that is, the selected object is divided into two parts, or delete a part of the object. This command works on lines, rays, arcs, elliptical arcs, polylines and construction lines. The Break command deletes the portion of the object between the first and second points. The first point selects the pickup point when the object is selected, the second point is the selected point, and if the selected second point is not on the object, the system will select the closest point on the object to that point. Select the Modify/Interrupt command, or click the Interrupt button, or type break on the command line to execute it. For a circle or arc, interrupting is done in a counterclockwise direction.
⑥ Filleting and chamfering: are selected to join two straight lines, arcs, elliptical arcs, polylines, construction lines, and spline curves by means of a predetermined arc or straight line segment. Select the Modify Fillet command, or click the Fillet button, or enter fillet on the command line to execute it. After activating the Fillet command, set the radius parameter and specify the two sides of the corner to complete the filleting operation for this corner. Select the Modify/Chamfer command, or click the Chamfer button, or enter chamfer on the command line to execute it. After executing the chamfer command, you need to specify the two sides of the corner and set the distance of the chamfer on the two sides in turn. The chamfer size is then determined by the two distances.
⑦ Zoom Graphics: Zoom in or out the selected graphic uniformly in proportion. You can specify a base point and length or enter a scale factor to scale the object. You can also specify the current length and new length for the object. A scale factor greater than 1 enlarges the object, and a scale factor between 0 and 1 reduces the object. Select the Modify/Scale command, or click the Scale button, or type scale on the command line to execute.
⑧ decomposition of graphics: mainly used to break down an object into multiple single objects. Mainly used in the decomposition of the overall graphics, blocks, text, dimensions and other objects. Select the Modify/Decompose command, or click the Decompose button, or enter explode on the command line to execute.
⑨ Merge Graphics: It is to make interrupted objects, or similar objects merged into one object. You can use arcs and elliptical arcs to create complete circles and ellipses. Merge objects include: arcs, elliptical arcs, lines, polylines, and spline curves. Select the Modify/Merge command, or click the Merge button, or type join on the command line to execute.
CAD Tutorial: Quick Drawing of 2D Graphics
1. Graphics Copy
The Copy command is used to copy the existing objects in the graphic to reduce the duplication of the same graphic drawing work. Select the Modify/Copy command, or click the Copy button, or type copy on the command line to execute.
2. Graphic Mirror
When drawing graphic objects relative to an axis of symmetry, you can use the mirror command, which will be selected along a specified line symmetrical copy of the object, the copy is complete, you can delete the source object, you can also not delete the source object. Select the Modify/Mirror command, or click the Mirror button, or type mirror on the command line to execute it. When the mirrored object contains text, you need to set the system variable mirrtext first, when the value is 0, the mirrored text is readable, when the value is 1, the mirrored text is not readable.
3. Graphic Offset
You can create a shape parallel to the original graphic object or with a concentric structure based on a distance or passing point. Offset objects can be lines, spline curves, circles, arcs, and square polygons. This is performed by selecting the Modify/Offset command, or by clicking the Offset button, or by typing offset on the command line. For unenclosed objects, such as lines, spline curves, and circular arcs, you can offset the shape parallel to the source object. For closed single objects, such as circles, square polygons, and polylines forming closed shapes, you can offset shapes that have a concentric structure with the source object.
4. Array of shapes
You can use the Array command when drawing multiple shapes that are equally spaced on the X-axis or on the Y-axis, or that are rotated around a center. Choose the Modify/Array command, or click the Array button, or enter the array command on the command line to execute it.
① Rectangular Array Array direction of the selected objects along the X-axis and Y-axis (i.e., the said rows and columns) after multiple copies, the created objects will be arranged in the user-defined number of rows and columns. In the Rectangular Array dialog box, set the number of rows and columns of the array; set the row spacing and column spacing; and set the counterclockwise rotation angle of the array. Enter a positive number in the row offset and column offset, then the graphics in the upper right corner of the array, enter a negative number in the row offset, then down the array, enter a negative number in the column offset, is to the left of the array.
② Circular array Arranged around a user-specified center of a circle or a base point around which to make a circle or a fan at an angle. In the Array dialog box, select the object, pick the center point, and there are three options in the Method drop-down box: a Total number of items and Fill Angle. b Total number of items and Inter-item Angle. c Total number of items and Inter-item Angle. b Total Items and Angle Between Items. c Fill Angle and Angle Between Items. c Fill Angle and Angle Between Items. Total Items is used to enter the number of objects, including the duplicate object itself. Fill Angle is used to enter the fill angle, within the fill angle can be copied, to determine how the object is distributed along the circumference, the default object is distributed along the entire circle that is 360. Angle Between Items is used to enter the angle of the two objects are separated. Rotate items when copying is used to set the angle at which objects will be rotated when copied, if this checkbox is not selected, the copied objects will not be rotated.
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