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Drafting symbols, standards and template

When 2D drafting systems first started being used, it made sense to build up libraries of frequently used symbols so they could be be cut and paste onto drawings as required. The simplest of these libraries were just individual drawings which you opened, copied what you needed, then pasted the symbols into the drawing you were working on.

Things got more sophisticated when these libraries were organized into menus, where you could pick the symbol you needed from a drop down list. You didnt need to have a drawing full of symbols loaded into memory. Menu driven systems could also be used with large digitizing tablets, where all the symbols were in plain sight and all you had to do was point to them to build up a schematic diagram.

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Most cad systems nowadays use symbol libraries that use software driven symbol generators that dont require a huge library of symbols at all. In these systems, you click on the requirements you want and the software builds the symbols for you. For example welding symbols where you need only select left hand or right hand, size of weld, far side or near side and so on. The nice thing about these systems is that you can go back and edit any symbol if the design needs to be changed

Most of my experience is with SolidWorks and AutoCad and both those packages come with a lot of symbols pre-installed. What follows are instructions to help you find these symbols for yourself

Accessing symbols in AutoCAD

In AutoCad I am fond of using "Tool Palettes" These allow you to have your commonly used symbols located in a box to the left or right of your screen all organized into categories.

Using the AutoCAD Tool Palette window to show blocks

If you type "toopalette" a the command line" in AutoCAD it should make the palette window show up similar to the one on the left.

In the picture I have added some electrical blocks to the palette so I can just drag and drop the symbols in whenever I need to build a schematic diagram

To get the symbols into the palette you first need to save each of you symbols as a seperate autocad file and them save them all into a directory

You dont have to confine yourself to symbols either, you can have whole drawings located off to the side if you wish, ready for quick modification

Next, type "ADCENTER" into the command line use the directory tree to locate the directory where the symbols were saved. Right click in the directory area and click "Save as Tool Palette".

Just click through all the default samples found in the palette. Insert them into your drawings and experiement. You may find you dont need to create new symbols at all

Dead simple

Accessing symbols in SolidWorks

In SolidWorks you have quite a lot of library components too. There are free models in Content Central, piping components, unistruts, retaining rings and free models of homer simpson and sponge bob. Some of it is close to hand, but some of the most interesting symbols have to be downloaded.

There is a combination of symbols for SolidWorks drawings as well as complete 3D models such as piping flanges, battery holders and so on

CAD Symbols CD

If you are looking for a particular symbol, there are a wide variety of software packages that provide just about any symbol and drafting standard you could imagine.

CADsymbols® CD is the most extensive collection of standard parts and symbols available containing over 30 million symbol drawings and models in 2D/3D view and freely revolving 3D models. CADsymbols CD is perfect for mechanical engineers; mechanical drafters' and non-professionals in the mechanical design arena who want to directly download complex symbols into their drawings instead of create them from scratch. Supports both imperial and metric measurements.


> Symbol libraries for CAD

 
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  • Sketching on a SolidWorks drawing

    If you are new to SolidWorks, there can be times when things are a little frustrating. One of those simple things is adding notes or sketching lines on an exisiting drawing with several views.

    You add your note or centerline and then move one of the views but the note you added stays where it is and you end up having to move it seperately.

    Or you have a note that belongs somewhere else in the drawing that gets moved when you are rearranging views when you dont want it to.

    The solution to these problems is found in these excerpts from the SolidWorks help section.
     
    Lock View Focus.
    Allows you to add sketch entities to views, even when the pointer is close to another view. You can be sure that the items you are adding belong to the views you want. You can also double-click views to lock the focus.
    So if you want to add a note or a line to views and have them move when you move the view, click in the views, right click and lock the view focus, then add the items you want.

    Once you are finished just click the views and unselect the lock view focus. Now your items should move in lock step with the views.

    What about notes that you want to be part of the sheet. Say you have some general material or heat treatment notes that you dont want to have moved when views are manipulated. You need to use lock sheet focus.

    Lock Sheet Focus.
    Allows you to add sketch entities to the sheet. Otherwise, the sketch entities belong to the view that is closest to where you begin sketching. You can also double-click a sheet to lock the focus. Lock Sheet Focus is available when at least one drawing view is present. When Lock Sheet Focus is enabled, the drawing sheet border is pink.

    Finally if you are in a situation where you want to lock certain projections in postion use lock view position. I find this useful when I want to use a single projection to show an open or closed position by superimposing views on top of each other:

    Create two views of the same part or assembly. Align them horizontally or vertically as required. Right-click anywhere in the desired view and select Lock View Position. Then you can line up the copied views right over top of the original, making it look as if both are the same.
    Following these directions should help so that notes and sketched lines dont end up where they are not supposed to be!