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# Bolt Circle Centerline through 2-points (180° apart)?

Experimenter

I have 2 holes that lie on a common bolt circle. The holes are 180° apart on the circle. Is there a way to create a bolt-circle centerline through these two points?

The options that I see are:

Through 3 or More Points (but we only have 2 points...)

Center Point

I can create a point, between the two hole centers, and then use the "Center Point" option - but the created point doesn't appear to be associatively linked to the two holes.

What is best-practice for creating a bolt-circle-ceterline through 2 holes that are located 180° apart on a common circle?

Thanks,

Steve

4 REPLIES

# Re: Bolt Circle Centerline through 2-points (180° apart)?

Phenom

I would use 1 Center Mark with 2 center points. The linear distance between hole centers is the same as a theoretical diameter between them.

-Tim

# Re: Bolt Circle Centerline through 2-points (180° apart)?

Experimenter

Thanks. I realize that I can dimension the (2) holes as you've shown. I was looking to dimension them as shown below. I used a sketch to do this - but was looking for a method that uses the drafting-application's Bolt Circle Centerline functionality.

# Re: Bolt Circle Centerline through 2-points (180° apart)?

Siemens Honored Contributor

Create a sketch in the view and insert some helper geometry in the sketch to drive the bolt circle centerline and then hide the sketch.

(view in My Videos)

Regards, Ben

# Re: Bolt Circle Centerline through 2-points (180° apart)?

Experimenter

Thanks Ben. I ended up basically doing what you showed in your video. That works fine for the desired result. I was thinking that a 2-hole bolt-circle was a common enough occurence that NX might have a built-in method for handling this. The logic could be;  if only 2 hole centers are picked - then use the midpoint between them as the center of the bolt-circle (possibly including a check-box for 2-hole situation) - or allow access to the point-dialog when in the command - so that the "between two points" option could be used to locate the bolt-circle center point.

I appreciate you including the video - that validates the method that I had used to get the desired result!

Steve