Measuring Runout and Circularity with V-Blocks

[@santiagomartirodriguez1131]

What is FIM and TIR? They are the same thing?

[@Gdandtbasics]

They stand for "Total Indicator Reading" and "Full Indicator Movement" and yes they are interchangeable. Its really just a quick way of saying, how much does the indicator show in total during the measurement. TIR is often times misinterpreted as "Total Indicated Runout" but when its paired with the runout controls, id say no harm no foul.

[@EricBrummer]

Your video mentions a polar probe or a TIR checker. It'd be cool if you included slightly more details on those types of tests to educate people. Searching either of those didn't come up with a ton of useful links. I assume we're talking about a system that checks with multiple sensors to monitor for the lift of the center axis such as kzbin.info/www/bejne/nHrFpWqid7l_aNU or a CMM setup that can plot the polar graph (either cause the part can lay flat normal to it's rotation axis or you have the part between centers or some other method.

[@Gdandtbasics]

Thanks for the comment, I love this idea! ill put it on the short list of ideas to make for a video. Stay tuned!

[@abboberg]

Couldn't you just use a flat-faced indicator held at a 45-degree angle and still use the vee block?

[@Gdandtbasics]

The issue of the form of the feature allowing the feature to settle into the v-blocks would still be present unfortunately.