od with 3 slots

[[Ri...]]

How can I do a 3 polyline on an OD without hitting three slots on the OD, so I could get my OD measurements. 

[[Pa...]]

Chance you can share a drawing or anything?  I'm not understanding the "3 polyline" reference.  I think of polylines as strategies for probing planes, while you've specified an OD.

Are you having trouble "finding" the slots that could be eliminated via fixturing or material detection techniques (self center, material detection, missing borehole, etc) in order to probe reliably?

I think you've got an OD with slots interrupting the surface, and you want to measure the OD.  There are several ways to do this.

1. single points set to miss the slots

2. Create a circle (or cylinder) on the OD.  In the strategy, create small arcs between the slots; one strategy for each.

3. Same as #2, but scan lines axially along the cylinder between the slots.

 

There are other methods too.  I don't want to detail any further before knowing I understand your problem.

[[Ri...]]

[[Ch...]]

by making three separate circular paths?!!

[[Ri...]]

Christmas, 

 I did , but 3x circle will do 380° circle

[[Ma...]]

First define stopping element on a part.

Now make 3 separate segments and edit start angle and angle range to cover correct place on a part.

Just like Christian showed. You can not have 380° coverage if you select correct angles.

[[Pa...]]

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In this image, my circle is set to start at the X- side of the cylinder (270° start angle) and is set to probe the "top" 180° of the circle.  You'd do the same in your program, except you'd need to find the correct start angle and range for your application.  You'll have 3 circles set as Martin gives above, but with your own starts and stops.