DISTANCE BETWEEN THREADED HOLES

[[Fe...]]

GOODMORNING,

HOW CAN I TAKE THE DISTANCE BETWEEN THREADED HOLES?

THANK YOU

[[Ma...]]

Measure threaded holes directly or via pins as cylinders. Then you can make intersections with plane or you can measure distance directly from cylinders.

Simple distance, caliper distance and many other common methods

[[Fe...]]

i takethe threaded holes with a propeller control then i use the simple distance to measure, but a non-real measurement comes out

 

[[Fe...]]

[[Ja...]]

[[Lu...]]

I often reference this video on how to best pick up threads
 

 

[[Pa...]]

Interesting.  My take, since positions of threads apply to the Pitch Diameter, I always use a self-centering helix on a cylinder feature, and I call (for an internal thread) the min circumscribed feature.  I often use a centering helix (2 revs) very near the bottom and another near the top, both in the same strategy.  I do work a lot with projected tolerances on threaded holes.

Anyone else doing this?

[[Ri...]]

This is a very common method, and works well with an active scanning head. 

I've actually had some customer start stating that the Position applies to the Minor Diameter. Lol. 

I have a pretty solid measurement strategy for picking up the Minor Diameter that works well, but it is slow. 

[[Fe...]]

Hi,

I tried creating a helical path by adding a start height and a mid height, entering 1.25 in the gradient window (which is the pitch of the M8), then I checked the auto-centering option. The problem is that the probe enters the thread, tries to auto-center, but then comes out, and obviously the traffic light turns red.

 

 

 

[[Pa...]]

In strategy make sure you have your start and stop positions of your helix where you like it.

Self-centering is going to require just a little more input than what you've done.  In the helix strategy under special settings / self-centering is a "Parameter" box.  Click it.

Note that I have toggled the "angle" button until the force is specified outward (I'm using an internal thread).

You can then change the axis direction.  Because of the problem you encountered I would point that arrow at the hole bottom as shown here.

While scanning the threads, I always monitor to ensure that the probe is advancing the correct direction for the thread, because I can get this backward during offline programming.

This should help you stop falling out of the thread.

[[Ri...]]

Please sign in to view this quote.

If you use full form thread mills and control the minor diameter to the same tolerance as the pitch diameter, this has merit.

I have sold this concept to customers; we did have to prove the thread is at full form typically with a mold sample (First hole, Last hole).