Inside Groove

QC Dude · Sep 22, 2012

Is there a hand held instrument, other than a caliper with an accuracy of .002in, that is reliable for measuring inside groove diameters? I need something more precise than a caliper.

Unless an inside caliper is reliable.

Probes for the cmm are costly.

Thanks.

Sean the Dog · Sep 22, 2012

You don't say if you're trying to measure the diamater or the length.

For length, there are groove mics., for example: Mitutoyo America Corporation

or: inside groove micrometer | eBay

For diameter, try something like: Inside Dial Caliper Gage(With interchangeable Contact point) - Series:SG05

QC Dude · Sep 22, 2012

My bad...I'm measuring diameter. Thanks for the info!

Ray Behner · Sep 22, 2012

Mueller is one nice gage. You need to use a mic to measure, but they work well and have many adapters. IPD Gages is another

machinistrrt · Sep 22, 2012

When the tolerance isn't too fussy, I use a Dyer Direct, someone else makes a similar version. There's Starrett's indicator gage, and Davis' Omnigage.

www.agdavis.com/pdf/Omni Gage.pdf

1175MZ Dial Indicator Groove Gage

crashtestdummy · Sep 24, 2012

How about an Indical? I've been told that they are very useful for various odd measurements.

INDICAL Bore and Groove Gage << Precision Measuring << Online Catalog << Penn Tool Co.

QC Dude · Sep 25, 2012

Thanks all! I felt that the inside groove caliper was acceptable...it's just my associate that said "he didn't like them". To hell with him. haha

QC Dude · Sep 25, 2012

machinistrrt said:
When the tolerance isn't too fussy, I use a Dyer Direct, someone else makes a similar version. There's Starrett's indicator gage, and Davis' Omnigage.

www.agdavis.com/pdf/Omni Gage.pdf

1175MZ Dial Indicator Groove Gage

That Starret is bad ass! A bit costly, but bad ass nonetheless.

QC Dude · Sep 25, 2012

Gordon B. Clarke said:
You should be able to get to within ±0.001" with a digital inside groove caliper if you use a reference ring at the approximate diameter you want to measure and apply the same measurement pressure.

There are many hand held instruments available too that can work to less than 0.002" accuracy.

My suggestion? Get a catalogue or catalogues from some of the measuring equipment manufacturers. You'll be surprised at how many options you have.

At any given time I probably have at least 10 thick catalogues handy. Mitutoyo is the best one I've seen yet as far as looking around at options goes Even makes for good bedtime reading if you're so inclined

Gordon

Thanks Gordon. We use MSC a lot and was perusing their catalog. Lot's of options. We are mostly a Mitutoyo and Brown and Sharpe shop, but are open to others.

The real Leigh · Sep 25, 2012

Accurately measuring the distance between parallel surfaces (e.g. micrometer faces) with a radiused instrument requires a bit of care. Not a major challenge by any means, but not a fly-by either.

- Leigh

The real Leigh · Sep 25, 2012

Gordon B. Clarke said:
And that's one of the reasons I'm often surprised at how accurately some claim to me able to measure with a micrometer and telescoping gages

Yeah. Ain't it amazing??? Talented fingers.

- Leigh

Jim Denney · Sep 25, 2012

PixMan · Sep 25, 2012

I've also used the Mueller gauges and feel they are among the very best. I found the one I used for years to be the most repeatable of any I'd used before or since.

QC Dude · Sep 26, 2012

crashtestdummy said:
How about an Indical? I've been told that they are very useful for various odd measurements.

INDICAL Bore and Groove Gage << Precision Measuring << Online Catalog << Penn Tool Co.

That looks very useful!

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