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Modify Commands - Part 2

Scale

Command for scaling: scale or sc

If you want to enlarge or reduce the size of an object you can use the scale command. The command example shown enlarges the object by a scale factor of two. This means that the linear size of the object will be doubled. If you input 0.5 the object will be scaled down to half its size and so on and so forth. You are only allowed to input positive and non zero values.

Command: sc
SCALE
Select objects: select object/s to enlarge
Select objects: press enter
Specify base point: select centre of enlargement
Specify scale factor or [Copy/Reference] <1.0000>: 2

As with the rotate command you have the options of ‘copy’ and ‘reference’ which also work in the same way.



Fillet

Command: fillet or f

A fillet is a round curve that connects two lines. Fillets are used in most designs as they help both aesthetically and structurally, strengthening objects. Invoke the fillet command and have a look at the current settings. Unless you have set it beforehand the radius should be zero as shown in the example:

Command: f
FILLET
Current settings: Mode = TRIM, Radius = 0.0000
Select first object or [Undo/Polyline/Radius/Trim/Multiple]:

If you do as you are prompted and select an object right away, you will be prompted to choose a second object and the command will terminate without anything happening. The problem is that if you fillet with a radius of zero then it is the same as having no fillet at all. To draw proper fillets you have to set the radius to a positive number and then go on selecting the items to be filleted:

Command: f
FILLET
Current settings: Mode = TRIM, Radius = 0.0000
Select first object or [Undo/Polyline/Radius/Trim/Multiple]: r
Specify fillet radius <0.0000>: 20
Select first object or [Undo/Polyline/Radius/Trim/Multiple]: select first object
Select second object or shift-select to apply corner: select second object

The polyline option allows you to fillet all sections of a polyline or all corners of a rectangle at once. The trim variable determines if the corners that are filleted will be trimmed or if they will still be drawn. The multiple option allows you to select more than two entities to fillet through a single command.

Chamfer

Command: chamfer or cha

A chamfer is like a fillet but it is not round. Rather than an arc a straight line is drawn between the two entities that forms like a bevel. As with the fillet command, if you select two lines to be chamfered right away, nothing will happen because the chamfer distance is set to zero. In order to have a proper chamfer, two chamfer distances have to be specified before. The example shows a chamfer with a distance ‘dist1’ of 5 and distance ‘dist2 of 10:

Command: cha
CHAMFER
(TRIM mode) Current chamfer Dist1 = 0.0000, Dist2 = 0.0000
Select first line or [Undo/Polyline/Distance/Angle/Trim/mEthod/Multiple]: d
Specify first chamfer distance <0.0000>: 5
Specify second chamfer distance <5.0000>: 10
Select first line or [Undo/Polyline/Distance/Angle/Trim/mEthod/Multiple]: select first line
Select second line or shift-select to apply corner: select second line

The other options available are pretty much like the ones for the fillet except for the angle and method options. The method option is used to change the method of data entry to ‘angle’ rather than the default method which is ‘distance’. The angle option itself is another way to define the chamfer by specifying the distance and the angle from the first line.



Trim

Command: trim or tr

When you are drawing, you often draw lines that extend further than necessary. It is not unusual to have lines that need to be shortened to stop at a boundary edge, and this is where the trim command is used. Consider the following diagram:

In this example the vertical lines have been selected as the cutting edges and the horizontal lines have been trimmed so that they end where they meet the respective cutting edge. The command line history for trimming this diagram is presented below

Command: tr
TRIM
Current settings: Projection=UCS, Edge=None
Select cutting edges ...
Select objects or


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