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Repairing Mitutoyo Digital Micrometers


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  Post Number #1  
Old 6th April 2017, 01:25 PM
Steve-S63

 
 
Total Posts: 5
Please Help! Repairing Mitutoyo Digital Micrometers

Hello,
I calibrate the threaded ring gages, calipers, micrometers etc in an in house lab at a fastener manufacturer. I've been searching the web, unsuccessfully, for information on fixing Mitutoyo digital micrometers. This particular one is a 0-1" pitch mic, 326-351, that had a broken crystal and was filled with coolant. I have cleaned these out before with varying results. This one will not increment the readout at all. It remains at 0.00000. I've tried removing the encoder disks and cleaning them, with isopropanol, thinking the coolant was preventing them from conducting/communicating with each other. Still no joy. I would like to find a way to fix these internally as they get bathed in coolant quite regularly here.

Thanks for any help and sorry if this is in the wrong forum, I could not find one that seemed more appropriate.

Steve

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  Post Number #2  
Old 6th April 2017, 03:18 PM
PaulJSmith's Avatar
PaulJSmith

 
 
Total Posts: 563
Re: Repairing Mitutoyo Digital Micrometers

Hi, Steve, and welcome to The Cove!

You say this happens quite regularly. What are you spending in time and materials to repair these regularly versus just buying new ones?

Maybe examine two alternatives:
1) Find a micrometer that is sealed and resists the incursion of the coolant, or
2) Re-evaluate the processes that are exposing these delicate instruments to such abuse, and find a way to avoid it in the first place.
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  Post Number #3  
Old 6th April 2017, 05:24 PM
Steve-S63

 
 
Total Posts: 5
Re: Repairing Mitutoyo Digital Micrometers

This one got dropped and the crystal broken with a piece missing. I have tried to impress upon them that 'coolant proof' and even 'IP65' do not mean the coolant will not harm and or destroy them to no avail. We make parts on demand so it's accepted that there will be higher than usual fall out of the gaging. I can change neither of these unfortunately.

Steve
  Post Number #4  
Old 20th April 2017, 05:54 AM
drobbins329

 
 
Total Posts: 17
Re: Repairing Mitutoyo Digital Micrometers

Have you tried making sure under the buttons is clean? Also, the traces on the board in relation to the buttons? I had a similar issue where the display would not change. It happened that one of the buttons had dried coolant under it, acting like the button was being held down. The delicate traces on the board also have to be clean. Maybe on yours its the zero or preset button? Does it move through the different "modes" as expected?
  Post Number #5  
Old 20th April 2017, 04:47 PM
Steve-S63

 
 
Total Posts: 5
Re: Repairing Mitutoyo Digital Micrometers

I cleaned it extensively, cleaned each button and the circuit board even removed the spindle to clean the rotary and encoder boards. It's out for repair at this time so we'll see what they say. Thanks for your response.
  Post Number #6  
Old 20th April 2017, 04:48 PM
drobbins329

 
 
Total Posts: 17
Re: Repairing Mitutoyo Digital Micrometers

Curious to hear what the problem is. I have a few with the same electronics. It would be good to know in the future.

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  Post Number #7  
Old 20th April 2017, 09:10 PM
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ncwalker

 
 
Total Posts: 195
Re: Repairing Mitutoyo Digital Micrometers

Analog mics with the vernier scale on the barrel are coolant proof ....

Just sayin'

  Post Number #8  
Old 21st April 2017, 09:43 AM
Eredhel

 
 
Total Posts: 143
Re: Repairing Mitutoyo Digital Micrometers

This may not help for what you're trying to do now but I learned something else recently. I've never had luck finding parts for different minor fixes we've needed over the years, whether it's a new housing for some calipers or whatever. Then I discovered that companies like Starrett and some others have deals with suppliers that aren't put out on their catalogs, online or otherwise. We've now been able to order lots of different pieces through suppliers we order other things from direct from the tool companies themselves.
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