Need to adjust?

Aukai

Aukai

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My 2 rolling Mit mic's came in today, the 0-2 at 2" is right on. At 1" it's 2 10ths off. I'm more concerned about the 0-1" being 5-6 10ths off at 1". What should my plan of action be?
 
Never calibrated digital mics before, but the barrel and sleeve on the 1-2 mic needs some serious attention.
 
Send 'em out for calibration?
 
jbobb what are you seeing? The 1-2" is new open box, what are the wrenches that come in the box for?
 
I'll have to dig up a Youtube video.
 
I admit I‘m a “the first thing you have to do is fix it” guy when buying something new, but a new (good) mic should show up ready to go. So yeah, they have tools, and it isn’t that difficult, but really? I’m thinking you should send them back - still a pain and maybe not worth the hassle or the wait. I bought a set of Brazilian made Mititoyo calipers (505- maybe) to replace my 30+ year old Craftsman/Sherr-Tomico’s. Won’t zero consistently. Had them too long to send for warranty. Not sure where the mics come from, but there’s a slip in their system.
 
Aukai said:
jbobb what are you seeing? The 1-2" is new open box, what are the wrenches that come in the box for?
Click to expand...
If you look at the scale on the 0-1, you'll see that it is pretty much inline with the locking screw. The same scale on the 1-2 looks to be almost 90 degrees off.
The wrenches are used to rotate the sleeve and remover the end cap so the thimble can be removed.
 
I always check and zero new micrometers against a known good standard. Yes, the wrenches that come with it are specifically for that purpose. Make sure the micrometers are not excessively hot or cold before you do this, the same for your standards. 1/10th of 1/1000th of an inch is not much. Also, clean the faces of the micrometers first (and your standards as well). They may have a dried coating of protectant on the faces, which can cause an error in reading. You should also swap your two "one inch standards" back and forth with each other, to ensure they give the same reading. It is unlikely a standard will be wrong, but it is another thing to check to ensure you have it set "dead to pecans".

Always use the slip/ratchet thimble to get your final reading. I have seen people use the barrel and get inconsistent results because people can't seem to tighten twice to the same reading. Even worse, they may over/under tighten to get the "desired reading".
 
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