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Old 01-24-2012, 03:57 AM #1
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Default calibrate/test my Caliper

I'm trying to get some precise measurements,
I have a $30 Pittsburgh caliper from harbor freight.

I know the procedure to zero it,

What I am wondering is if there is a common house hold item that has a very tight regulation on its size that I can measure and see if my caliper is accurate.

for example a diode maybe?
a penny? or what.

Thanks


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Old 01-24-2012, 04:02 AM #2
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Default Re: calibrate/test my Caliper

If you were into body piercing then you could use stretchers to calibrate it. I know I have hundreds of them laying around. They're very tightly regulated for sizing.

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Old 01-24-2012, 04:03 AM #3
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Default Re: calibrate/test my Caliper

Got an 8pin LM386? IIRC the case dimensions are tightly regulated for pick/place machinery.
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Old 01-24-2012, 04:26 AM #4
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Default Re: calibrate/test my Caliper

Thanks guys

Measured an IC from TI and it was .2mm off, But id like to come up with somthing larger to see if it is off by a percentage or just a small amount,
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Old 01-24-2012, 04:36 AM #5
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Default Re: calibrate/test my Caliper

If you need I can send you 20, 22, 25, 28, 30 and 32mm spacers to get a wider variety of data.

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Old 01-24-2012, 10:37 AM #6
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Default Re: calibrate/test my Caliper

May I ask why you want to calibrate your calipers and how accurate do you actually need them? I work in a government machine shop where we make explosives (various mortars mostly) and if its ABSOLUTELY necessary ... I could maybe have one of my friends in our gauge lab calibrate them for you.
All though I would have to say its for me.

The government wants their weapons made with a .00x tolerance. So that's about as accurate as I can get you.
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Old 01-24-2012, 10:55 AM #7
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Default Re: calibrate/test my Caliper

How about a Penney I measured several of the and the average is .748"
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