### Constructing a Mid Line

First three paragraphs changed from original per Dan Zwick. See PR 246467.

A mid line can be constructed between a line (cone, slot, cylinder, or plane) and a line (cone, slot, cylinder or plane). PC-DMIS creates a line (mid line) such that each of its points is the same distance from both input lines. You can construct mid lines from lines that are parallel as well as lines with any angle between them. The lines do not have to intersect.

The mid line centroid is a point on the line segment between the centroids of the input lines that is the same distance from both lines (it is not necessarily the midpoint of the line segment).

The direction of the mid line vector depends on the location of the mid line centroid and on the two input vectors, with the sense of the mid line vector determined by the first line vector. Expressed mathematically, if the first line vector is V1 and the second line vector is V2 then the direction of the mid line vector is generally either V1 + V2 or V1 - V2.

To construct a Mid-Line:

1. Access the Construct Line dialog box (Insert | Feature | Constructed | Line).

2. Select the Mid option.

3. Enter in the first feature. It must be either a line, cone, cylinder, or slot.

4. Enter in the second feature. It must be either a line, cone, cylinder, or slot.

5. Click the Create button.

The Edit window command line for this option would read:
CONSTR/LINE,MID,feat_1,feat_2,length

Constructing a Mid Line from 2 Lines | A - Constructed line (a mid line) equally spaced between two lines (FRONT and BACK). B - FRONT C - BACK