Non-tactile ID measurement question

marcusja2002

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Looking for options for non-tactile ID measurements. Its a softer material, so bore gages and pin gages aren't accurate enough. I would also like it to be quick.

Thanks in advance
 

Hendi

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Messmikroskop (Measurement microscope?), a microscope with a micrometer-driven x-y-table and a crosshair reticle might work for you.
 

Michael_M

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There are lots of vision systems measurement tools. Good vision systems will also measure out of roundness which (from my Esperance) is a major concern when just measuring across point to point.
 

marcusja2002

Involved In Discussions
vision based systems will only get the top rim of the part. If you want to measure at difference depths, look at non-contact air plug gauges.
Here's one I used at my lost job:

Warning - they are not cheap
That is a really cool piece of equipment. Most of the videos I've found are showing hard metal rings. What is the softest material you've experienced them work with. Also what is the range you experienced with each of the rods?
 

Michael_M

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I have used Mahr Federal Air plug gages in the past. They are EXCEPTIONALLY accurate but have an exceptionally small range (±.001 if I remember correctly). Also remember, with the probes you will need ring gages so that also adds up. In my experience, Mahr Federal is good when you have a specific size with an exceptionally tight tolerance.

I have also used Micro Vu and they are great as a general measurement tool (and they are accurate). The Micro Vu is what I was thinking of when I made my first post about vision systems. I think the only issue I can state with the Micro Vu is the cost and placement. It is similar to a CMM in that it needs a dedicated location (preferably clean) where the Mahr can be moved from machine to machine.
 

marcusja2002

Involved In Discussions
I have used Mahr Federal Air plug gages in the past. They are EXCEPTIONALLY accurate but have an exceptionally small range (±.001 if I remember correctly). Also remember, with the probes you will need ring gages so that also adds up. In my experience, Mahr Federal is good when you have a specific size with an exceptionally tight tolerance.

I have also used Micro Vu and they are great as a general measurement tool (and they are accurate). The Micro Vu is what I was thinking of when I made my first post about vision systems. I think the only issue I can state with the Micro Vu is the cost and placement. It is similar to a CMM in that it needs a dedicated location (preferably clean) where the Mahr can be moved from machine to machine.
I saw a few of those and compared to the pin gages we currently use it seems a lot slower. We have external laser mics that can measure a few thousandths up to like 3" without touching it. I just cant seem to locate an internal laser that is as quick as the air gage, but can measure large ranges. In my research nothing like that seems to exist.
 

Michael_M

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I saw a few of those and compared to the pin gages we currently use it seems a lot slower. We have external laser mics that can measure a few thousandths up to like 3" without touching it. I just cant seem to locate an internal laser that is as quick as the air gage, but can measure large ranges. In my research nothing like that seems to exist.


What type of tolerance are you looking to hold?
 
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