Projecting to a Perpendicular Point

In this Task

• Points will be projected and lines drawn to a perpendicular point to create the hidden line detail for the holes.

 

Associated Tasks

• Using Polar coordinates to draw to specific lengths and angles.
• Using the Mirror tool.
• Using the Format Painter tool.
• Using the Shrink/Extend tool.

 

Before you Start

• Extended Ortho snap mode is activated.

 

Take Note

• The local menu, obtained by right clicking, can be used to access a snap such as Project. Alternatively, the keyboard J key can be used as a single-instance snap.
• Menu options for the Default menu and workspace, the Ribbon and Palettes are provided directly under the Command Name heading.

Projecting points and drawing lines to a perpendicular point

Select the Polyline tool and use the projected intersection point shown by the arrow below. Move the cursor to the projection point on the right vertical edge as shown by the pointer below. Left click to start the line here.

Draw to a length of 19 by inputting 19 into the Length field and 0 in the Angle field. Next, project the intersection point shown by the arrow below and draw to the point indicated by the cursor.

Draw to the next point by inputting J to indicate the Project snap mode. Draw to the right edge shown below.

Mirror

Ribbon : Edit | Copy Entities | Mirror

Default Menu : Modify | Copy | Mirror

Palette : Copy | Mirror Copy

Note : Command is activated when the object is selected.

The mirror tool duplicates objects symmetrically about a mirror line. The original object can be retained or discarded.In the example below, the left object is being mirrored about the mirror line defined by points 1 and 2.

The Mirror tool can be used to reproduce the newly drawn polyline outline by using the center line as the line of symmetry.

Select the newly drawn polyline, then from the menu options above, select Copy > Mirror. To define the first point of the mirroring line, select the Intersection point shown by point 1 below left.

Drag the cursor to the next intersection shown by point 2 below left. The result is shown below right.

Creating a mirrored image of a polyline

 

 

Explode

Ribbon : Modify | Format | Explode

Default Menu : Modify | Explode

SHIFT-ALT-E

The Explode tool reduces a compound entity to its individual components. For example, a rectangle, when exploded comprises 4 single lines instead of a single entity.

Both newly drawn polylines should be exploded to reduce them to single line objects, then the Shrink/Extend line tool can be used to extend the vertical line shown by the top pointer to the edge shown by the bottom pointer.

Extending the vertical line to the horizontal