u/I_am_not_a_number_22

I want to measure or create a calibration curve for an electronic digital caliper.

The most direct way to do this is to measure the shank diameter of a handful of twist drill bits and chart the caliper reading against the stated drill size. I'm talking in the 1/16 inch to 3/8 inch range.

The accuracy of this method depends on whether or not twist bits in general are made with shank sizes that match exactly their stated bit size. Or are drill bits intentionall made perhaps 1% smaller (as measured at the shank) than their stated size? That's essentially the question I have.

I'm looking at having to buy a $200 - $300 scanner (Autel seems to be the only game in town here) that does bi-directional ABS functions like brake bleeding for a 2001 Chrysler 300m that I've replaced the brake lines but still have soft pedal after a standard fluid flush. Was wondering if there was a github or hack-a-day project that's created a super-universal diagnostic / service scanner that can do this.