Checking for Oversize Hole - Dimensioning question

V

vardar3

#1
for a hole, 15.85 +/- .03 gives a tolerance boundary of 15.82 – 15.88 mm. Would a part measuring 15.88000… be within these tolerance limits, or is it out?

In checking for oversize hole, should the 15.88 mm gage pin be able to go in the hole?
 
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P

PaulJSmith

#2
Re: Easy Dimensioning question:

If you've measured it more than once and keep getting 15.88, then it is within the stated tolerance. That +/- is inclusive.

Of course, if you're getting accurate measurements out to 5 decimal places, you need to share your calibration lab with the rest of us.
 
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Michael_M

Trusted Information Resource
#3
Re: Easy Dimensioning question:

for a hole, 15.85 +/- .03 gives a tolerance boundary of 15.82 ? 15.88 mm. Would a part measuring 15.88000? be within these tolerance limits, or is it out?

In checking for oversize hole, should the 15.88 mm gage pin be able to go in the hole?
Technically speaking, yes it is within tolerance. Where I have run into problems with issues this close to the tolerance zone is when someone else checks the part. Temperature, humidity, and how the part is held in warm hands can affect this dimension when the customer gets it. Depending on the pin you use, it too can be off. Deltronic pins have a tolerance of +.000040/-.000000 (+.0010mm/-.0000mm). That may come into play as well.
 

Jim Wynne

Staff member
Admin
#4
for a hole, 15.85 +/- .03 gives a tolerance boundary of 15.82 ? 15.88 mm. Would a part measuring 15.88000? be within these tolerance limits, or is it out?

In checking for oversize hole, should the 15.88 mm gage pin be able to go in the hole?
It depends on the pins you're using. A 15.88 pin at exact size won't fit into a 15.88 hole at exact size. The ID of the hole and the OD of the pin can't occupy the same plane simultaneously.

This is why there are "plus" and "minus" pins. The former are slightly larger than their nominal size and the latter are slightly smaller. Which pin to use depends on whom you're trying to protect. If you use a plus pin, you could conceivably reject parts that are at the top of the tolerance range, thus protecting the customer. On the other hand, if you use minus pins, you could accept parts that are below the bottom of the tolerance range, which would be in favor of the producer.
 

bobdoering

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#5
That is the difference between CMM and gage pins: fit. You can not have line-to-line fit - that is called press fit, and the pin will never come out. So, if a 15.88 pin goes in, the hole is already too big.

On top of fit, pins measure MMC. So, a CMM will find diameters even larger based on roundness.

The only way it works out is of the customer agrees to that measurement technique - then you are on the same page and all is well (until they get a new quality engineer.)
 
V

vardar3

#6
Re: Easy Dimensioning question:

Haha, no I’m speaking theoretically. If the part measures on the high limit, 15.88, is it in?
Here is why I ask. I’m having a discussion about what pin should be able to fit in the hole. I’m saying that the hole can be 15.88, so the 15.88 gage pin should be able to fit. My partner is saying the 15.88 is the no go. 15.88 should not go. Who is correct???
 

Michael_M

Trusted Information Resource
#7
Re: Easy Dimensioning question:

Haha, no I?m speaking theoretically. If the part measures on the high limit, 15.88, is it in?
Here is why I ask. I?m having a discussion about what pin should be able to fit in the hole. I?m saying that the hole can be 15.88, so the 15.88 gage pin should be able to fit. My partner is saying the 15.88 is the no go. 15.88 should not go. Who is correct???
In a perfect world, your partner is correct, as Jim pointed out, two objects cannot occupy the same space. However if the pin used is a negative pin, than technically speaking, you are as the pin is undersized.
 
P

PaulJSmith

#8
Re: Easy Dimensioning question:

Haha, no I?m speaking theoretically. If the part measures on the high limit, 15.88, is it in?
Here is why I ask. I?m having a discussion about what pin should be able to fit in the hole. I?m saying that the hole can be 15.88, so the 15.88 gage pin should be able to fit. My partner is saying the 15.88 is the no go. 15.88 should not go. Who is correct???
Theoretically, or realistically?
If the hole measures 15.88, then it is within the stated tolerance.
If you can fit a 15.88 pin in the hole, then the reality is that it's larger than the pin ... which makes it OOT.
As pointed out already, it depends on the pin itself.
 
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