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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?



Parents
  • Locators work well but they are a pain. You will inevitably forget to install one in your longest running hot program. You will inevitably forget to take out ALL of them at some point and lose them forever. You'll wind up being one or two short for the hot job that you've got to do. If management decides that they need to be calibrated Rolling eyesthey're gone for a couple of weeks. Checking for chips/ burrs should be a fundamental part of the inspection process. Questioning out of tolerance results should be a fundamental part of the inspection process.
Reply
  • Locators work well but they are a pain. You will inevitably forget to install one in your longest running hot program. You will inevitably forget to take out ALL of them at some point and lose them forever. You'll wind up being one or two short for the hot job that you've got to do. If management decides that they need to be calibrated Rolling eyesthey're gone for a couple of weeks. Checking for chips/ burrs should be a fundamental part of the inspection process. Questioning out of tolerance results should be a fundamental part of the inspection process.
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