Calibrating a mitutoyo digital height gauge?

J

jordan6679

Plastic

Joined

Feb 14, 2014

• Sep 6, 2014

• #1

I picked up a new granite and mitutoyo 192-656 0-18" Height gauge. I cleaned it well and polished the ways a bit, I'm not sure the age but it's very clean with no abuse. I checked it out with a 4 and 10" mitutoyo ID Mic rod, it is way out of calibration. At 4", it was .004 high. And at 10" it was .0105 high. Can I adjust this at home, is there something mechanical I can service or is it in the encoder?

Thanks for any input.

Tom

 

helterskelter

Cast Iron

Joined

Jun 27, 2011

Location

Dallas, TX

• Sep 7, 2014

• #2

I don't understand calibrating using an 'id mic rod'. Can you post pictures of your setup?

 

C

CalG

Diamond

Joined

Dec 30, 2008

Location

Vt USA

• Sep 7, 2014

• #3

jordan6679 said:

I picked up a new granite and mitutoyo 192-656 0-18" Height gauge. I cleaned it well and polished the ways a bit, I'm not sure the age but it's very clean with no abuse. I checked it out with a 4 and 10" mitutoyo ID Mic rod, it is way out of calibration. At 4", it was .004 high. And at 10" it was .0105 high. Can I adjust this at home, is there something mechanical I can service or is it in the encoder?

Thanks for any input.



Tom

View attachment 116436

Click to expand...

On Mits stand alone readers, there are DIP switches on the board to provide correction for linear errors. Perhaps there is a similar feature on your guage head. You need to find the literature for the unit. It will tell all ;-)

 

J

jordan6679

Plastic

Joined

Feb 14, 2014

• Sep 7, 2014

• #4

helterskelter said:

I don't understand calibrating using an 'id mic rod'. Can you post pictures of your setup?

Click to expand...

I simply stood the rods in a v block. I have a 1-12" set of mitutoyo calibration rods.

 

sfriedberg

Diamond

Joined

Oct 14, 2010

Location

Oregon, USA

• Sep 8, 2014

• #5

Wow, I never considered that problem (scaling error) for the digital height gages. I've got a two-beam mechanical (the type with separate up and down counters) and that particular problem is one it inherently can't have.

 

I

IronReb

Stainless

Joined

May 26, 2011

Location

Shreveport/Louisiana USA

• Sep 8, 2014

• #6

That is not a cheap height gage, hard to imagine it being off that much.

 

J

jordan6679

Plastic

Joined

Feb 14, 2014

• Sep 8, 2014

• #7

I tore it to the frame and gave a deep cleaning. The teeth were caked deep with shop grime, I cleaned them out with a brush several times until every tooth was perfect. I reassembled and lubed it with some dry moly lube. Checking calibration with the same 4 and 10" rods, it read the same. The encoder was clean and smooth. Again, at 4" it was .0045 high, at 10" .0105 high. I don't understand where the error is coming from. I didn't see any kind of linear scaling adjustment on the circuit board, but it does have a readout outlet, and possibly another outlet for calibration?

 

michiganbuck

Diamond

Joined

Jun 28, 2012

Location

Mt Clemens, Michigan 48035

• Sep 8, 2014

• #8

I don't think much of your checking rods thinking 123 blocks or jo block stack may be better.
but with checking the same twice getting same then perhaps OK. and the device is off.

http://www.mitutoyo.co.jp/eng/support/service/manual/pdf/99MAF009M_HDS-20C.pdf

 

J

jordan6679

Plastic

Joined

Feb 14, 2014

• Sep 8, 2014

• #9

Here is the output

 

J

jordan6679

Plastic

Joined

Feb 14, 2014

• Sep 9, 2014

• #10

 

michiganbuck

Diamond

Joined

Jun 28, 2012

Location

Mt Clemens, Michigan 48035

• Sep 9, 2014

• #11

Perhaps the follow wheel has run over so much crud it is now defective.

Sure looks like the device is not measuring well.
Might call Long Island and ask for advice and rebuild price.

228 : Mitutoyo height gage