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Products => Test Equipment => Topic started by: w.v.s. on May 20, 2024, 02:18:27 pm

Title: Mitutoyo Digital ABS CoolantProof Calipers IP67
Post by: w.v.s. on May 20, 2024, 02:18:27 pm

Hi,

I've bought a set of heavily mistreated (electronics seem to be intact, display broken, but data output works) absolute Mitutoyo calipers. How the sensor system looks like for the standard calipers, can already be found on web-pages like this one: https://www.grant-trebbin.com/2014/04/digital-calliper-teardown-and-repair.html (https://www.grant-trebbin.com/2014/04/digital-calliper-teardown-and-repair.html). I did not find similar material for the absolute scales, but was curios so I did a bit of tear-down, which I start sharing today. I seems to work with inductive coupling between the center lanes and the two outer lanes. We can see the phase difference between the center and outer lanes gradually changing along the scale.

Title: Re: Mitutoyo Digital ABS CoolantProof Calipers IP67
Post by: w.v.s. on May 20, 2024, 02:20:47 pm

Here is the sensor PCB, the second picture with increased contrast.

Title: Re: Mitutoyo Digital ABS CoolantProof Calipers IP67
Post by: w.v.s. on May 20, 2024, 02:27:07 pm

Here are the start and the end of the scale shown in detail.

Title: Re: Mitutoyo Digital ABS CoolantProof Calipers IP67
Post by: w.v.s. on May 20, 2024, 02:30:58 pm

And this shows how the depth bar is fixed (probably welded) to the slider.

Title: Re: Mitutoyo Digital ABS CoolantProof Calipers IP67
Post by: w.v.s. on May 20, 2024, 02:37:48 pm

I anyone knows, where I could buy that type of LCDs, please let me know.