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Tru-pos (opinion)

I would like to get some opinions on Tru-pos locators. These are the tapered style that have a no/go thread at the end so it only locates on the thread.

1. is it better practice to project the cylinder back to the surface and report out that circle? Or is Tp perpendicular to centerline using the cylinder better? (I use legacy)

I like perpendicular to centerline method because we measure a lot of parts that are on spherical or conical surfaces. It just seems to add a unnecessary chance on error.
As far as surfaces that are flat and perpendicular I still use the same method.

2. I actually have had good success with checking threaded holes using pitch. But…. What I don’t like is the chance of the probe picking up a chip off of the inside of the thread. Potentially throwing other surfaces or holes to be off.

So, if money wasn’t an object as far as buying tru-pos. What do you all like as far as accuracy?



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  • I also have had great results using pitch. I always show circle form or cylinder cylindricity as a safeguard from dirt/chips. I don't use tru-pos plug gages.
    We work in automotive and sheet metal protopype.


    I have also had great luck using pitch. I have even used pitch then re ran it to a gage pin through the threaded hole and got results that were within .0001.
  • I know this is a couple years old but I figured why not ask.... Closed mouths don't get fed after all, but without getting to nitty gritty is there a few basic steps I can learn to make a habit out of doing when programming threaded holes to get more consistent readings? We work in semiconductor/gas fluid delivery & have tolerances of .003-.010 on positions of these holes.
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  • I know this is a couple years old but I figured why not ask.... Closed mouths don't get fed after all, but without getting to nitty gritty is there a few basic steps I can learn to make a habit out of doing when programming threaded holes to get more consistent readings? We work in semiconductor/gas fluid delivery & have tolerances of .003-.010 on positions of these holes.
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