Measuring a .250 diameter hole +/.005 in Thin Laminates

E

Eloy Gomez

#1
What is the best way to measure a .250 diameter hole +/.005 on an aluminum .030" thickness sheet? With a bore gage or a pin gage?
 
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F

Frank T.

#2
What is the best way to measure a .250 diameter hole +/.005 on an aluminum .030" thickness sheet? With a bore gage or a pin gage?
In my opinion, I would use a pin gage. I believe you will get a better measurement using this method, as there is not enough height in the thickness of the part to use a bore gage and get an accurate measurement.

Just my :2cents:
 

bobdoering

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#3
In my opinion, I would use a pin gage. I believe you will get a better measurement using this method, as there is not enough height in the thickness of the part to use a bore gage and get an accurate measurement.
I agree. The only issue with a pin gage is it is MMC. As long as roundness of the hole does not matter, you will be OK. If it does, then you need optical comparator, vision system or other such device.
 
B

brahmaiah

#4
What is the best way to measure a .250 diameter hole +/.005 on an aluminum .030" thickness sheet? With a bore gage or a pin gage?
You have to use a set of calibrated pin gauges with size intervals of 0.002mm between them.Or else a co-ordinate measuring machine with appropriate accessories which provide 0.001mm sensitivity.
V.J.Brahmaiah
 

bobdoering

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#5
You have to use a set of calibrated pin gauges with size intervals of 0.002mm between them.
If you have to simply measure the hole, .001" increment pins should do. But, if you want to do SPC on the hole, you need to know your control limits, and use the 10:1 on the distance between them - which will likely require .0001" pins. Again - pins are only good if the roundness of the hole is not significant.
 
E

Eloy Gomez

#8
Well, actually I am assessing the competence of our inspection department and one of the questions on the exam is the following:

Which of the following would be the most appropriate inspection tool to measure a machined, .213” dia. hole +/- .010, in a .030” thick stainless steel plate?

a. Micrometers
b. Gage pin
c. Calipers
d. Bore gage

This is one question I was not sure about the answer, a gage pin makes sense, the bore gage too accurate and calipers seem good enough for the +/-.010" tolerance.

Suggestions are welcomed.
 

Jim Wynne

Staff member
Admin
#9
Well, actually I am assessing the competence of our inspection department and one of the questions on the exam is the following:

Which of the following would be the most appropriate inspection tool to measure a machined, .213” dia. hole +/- .010, in a .030” thick stainless steel plate?

a. Micrometers
b. Gage pin
c. Calipers
d. Bore gage

This is one question I was not sure about the answer, a gage pin makes sense, the bore gage too accurate and calipers seem good enough for the +/-.010" tolerance.

Suggestions are welcomed.
It depends. If you need to know something about the roundness of the hole and you have a skilled operator, a bore gage would be the best tool. If roundness isn't an issue, a pin would probably be sufficient. If you're dealing with a clearance hole for a fastener (not likely given the odd nominal size and the fact that the hole is machined), calipers might be OK.
 

Stijloor

Staff member
Super Moderator
#10
Well, actually I am assessing the competence of our inspection department and one of the questions on the exam is the following:

Which of the following would be the most appropriate inspection tool to measure a machined, .213” dia. hole +/- .010, in a .030” thick stainless steel plate?

a. Micrometers
b. Gage pin
c. Calipers
d. Bore gage

This is one question I was not sure about the answer, a gage pin makes sense, the bore gage too accurate and calipers seem good enough for the +/-.010" tolerance.

Suggestions are welcomed.
Calipers would suffice. However, when statistical studies must be conducted, you should use a device that is able to show you deviations in .001". A bore gage or intrimik are more appropriate.

Stijloor.
 
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