Autocad Hatching Tutorial




   
 
 
 
~|| AutocadCentral.com Lesson 9 of 12 - Autocad Hatching ||~

 

Hatching
Hatching is used to add shaded patterns to objects and shapes within an Autocad drawing. Hatch patterns can be used to indicate a material to be used, such as a concrete hatch. Alternatively it could be used to make an area of a drawing stand out.



A foundation detail with the Autocad default AR-CONC hatch pattern applied.

The hatch command can be found on the draw toolbar, or the draw drop down menu. When entered, a dialogue box appears as shown below:

Type - Custom hatch patterns can be created in Autocad. Leave it set to predefined to use Autocad's built in hatch patterns.

Pattern - This is where we select a hatch pattern from Autocad's default list. Select to view more patterns. The hatch pattern palette appears, with hatch patterns arranged under the categories: ;ANSI', 'ISO', 'Other Predefined' and 'Custom'. The most common hatch patterns required are under the 'Other Predefined' Tab.

Angle - This sets the angle of the hatch pattern, the default value is 0.

Scale - This sets the size of the hatch pattern. This must be set correctly dependant on if you are drawing in metres or millimetres. A little trial and error is required to obtain a suitable scale (See Preview below).

Pick Points & Select Objects - These are Autocad's two different methods of hatching an area. Using pick point, clicking inside an area (such as a rectangle) will result in the hatch pattern being applied to all blank space within the boundary. Select object simply hatches within a selected object.
Great care must be taken to ensure that the area to be hatched is closed, and all line endpoints are meeting each other. If a small gap is left open, the hatch command will fail, usually with the error: Unable to hatch boundary.

Preview - Enables a quick preview of the hatch before applying it, letting us quickly change and preview settings before we ok them. Very useful when trying different hatch scales.

Inherit Properties - This command enables the hatch settings of a hatch already in use in the drawing to be brought into the boundary hatch dialogue box.

Composition - This is how Autocad is to treat objects to be hatched. For the moment, leave it set to Associative.


Pick Point


The above hatch was created by using the pick point method. The hatch stays within all the solid lines.

Select Object


The above hatch was created by using the select object command. The rectangle was selected, and as a result all of the rectangle becomes hatched. Interestingly, if both the hexagon and rectangle were selected (i.e BOTH boundaries) then the hatch pattern would have had the same result as in the above 'pick point' example.

Be careful to ensure that there are no gaps in the boundary to be selected (zoom in if required). Usually, this results in either unexpected results, or a hatch error as shown below.



Have a go with the hatch command with the following Autocad drawing file:

 

Lesson9.dwg (Autocad 2000 file)
Lesson9r14.dwg (Autocad 14 File)

Use the select object method to apply the hatch pattern AR-CONC (found in Other Predefined in the hatch pattern palette) to the concrete foundation. Use a hatch scale of 1 and angle 0.
Use the pick point pattern to apply the hatch pattern ANSI32 (Found in ANSI in the hatch pattern palette) to the bricks. Use a hatch scale of 3 and an angle of 0. Note:separate multiple areas can be selected with the pick point method, all in one go!

Your finished drawing should look like the one below:




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