Lesson47- CHAMFER command

The Chamfer command is similar to Fillet in many ways except a straight LINE segment is created instead of an ARC.

  • use Chamfer to break sharp corners where two LINEs cross or meet (or would meet if extended to an intersection point).
  • you cannot use Chamfer on selected ARCs (unlike Fillet).

Method

  • Chamfer can use 2 different methods and you can change methods using the Method option.
    1. select the Distance method to specify chamfers using two distances measured from the intersection point.
    2. select the Angle method to specify chamfers using a length and an angle.
    3. Dist1 or Length is applied on the first LINE you select.

Six system variables can have an effect on Chamfer and one variable (CHAMMODE) is always reset in new drawing sessions.

Changing Distance Values

You can change the distance values (CHAMFERA & CHAMFERB) by using the Distance option at the first Chamfer prompt.

you are prompted for the first & second distances and this also sets the current method to Distance if it is not already set.

the Chamfer command is terminated when you specify new distances so you must invoke Chamfer again to use them.

Changing Angle Values

You can change the angle values (CHAMFERC & CHAMFERD) by using the Angle option at the first Chamfer prompt.

  • you are prompted for the first length and the angle and this also sets the current method to Angle if it is not already set.
  • the Chamfer command is terminated when you change angle values so you must invoke Chamfer again to use them.

Trim Mode

The current Trim Mode setting is reported in parenthesis on the command line when you invoke Chamfer.

  • if you see (TRIM mode) the LINEs you select for Chamfer are adjusted to terminate at the endpoints of the new LINE.
  • if you see (NOTRIM mode) the LINEs you select for Chamfer are not changed in length.
  • use the Trim option of Chamfer to change this setting.This setting is saved in the TRIMMODE system variable which is 
stored in your system registry
  • the same TRIMMODE system variable has a similar effect on the 
Fillet command (see page 18).
  • You can also apply Chamfer on LWPOLYLINE objects by using the 
Polyline option.
  • The default values for the Angle method (Length=1, Angle=0) can 
be used to make two LINEs terminate at the point of intersection.

this is like using Fillet on LINEs with a Radius of zero.

practice with CHAMFER

  1. Close the drawing from the previous exercise if it is open.
  2. Open the T108_5.dwg drawing in your personal folder.

Each red dashed square represents one drawing unit.

  1. Pick Modify + Chamfer and right-click in the drawing area to invoke a shortcut. Select Distance and then enter 2 for the first chamfer distance and 4 for the second chamfer distance. The command line history is shown.

Distance was already the current method in use (it is reset to this method in new drawing sessions until you explicitly select Angle)

when you see Dist1 and Dist2 in the first command line prompt you know that the current method is Distance.

  1. Right-click in the drawing area to invoke a shortcut and select Repeat Chamfer.

  1. Select the first LINE near P1 then select the next LINE near P2 to chamfer this corner. The command line history is also shown below.

Command: CHAMFER
(TRIM mode) Current chamfer Dist1 = 2.0000, Dist2 = 4.0000
Select first line or [Polyline/Distance/Angle/Trim/Method]: (pick LINE near P1) Select second line: (pick LINE near P2)
Command:

Dist1 is applied to the first LINE you select and Dist2 is applied to the second LINE you select.

  1. Right-click in the drawing area to invoke a shortcut and select Repeat Chamfer.
  2. Right-click in the drawing area again to invoke a shortcut and select Angle. Enter 3 as the length and 10 as the angle.

  1. Right-click in the drawing area select Repeat Chamfer.
  2. Pick the first LINE near P1 and the second LINE near P2. 
The command line history is also shown.

Command: CHAMFER
(TRIM mode) Current chamfer Length = 3.0000, Angle = 10
Select first line or [Polyline/Distance/Angle/Trim/Method]: (pick LINE near P1)
Select second line: (pick LINE near P2)
Command:

The method was set to Angle when you used the Angle option to change angle values.

  1. Right-click in the drawing area and select Repeat Chamfer.
  2. Right-click in the drawing area to invoke a shortcut and select Method. Right-click in the drawing area again to invoke another shortcut and select Distance. Then pick the first LINE near P1 and the second LINE near P2.

Command: CHAMFER
(TRIM mode) Current chamfer Length = 3.0000, Angle = 10
Select first line or [Polyline/Distance/Angle/Trim/Method]: (right-click)

You can use the Method option to change methods without having to specify the values (e.g. CHAMFERA & CHAMFERB) again.

Distance values specified in step 3 are used again automatically when you switch back to using the Distance method.

More practice?

  1. Save the changes to this drawing and Close the file.
  2. Open the T108_6.dwg drawing in your personal folder.
  3. Use Chamfer to modify the 8 (square) corners. You can use the Distance method with 0.03 as the same distance for Dist1 and Dist2. You can also use the Angle method with 0.03 as the length and 45 as the angle. The final drawing is also shown for reference (you only create the chamfers).

  1. Save the changes to this drawing and Close the file.

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