When and how to apply Bonus Tolerance MMC - Hole Dimension

L

lildee

#1
I had a test and answered this problem with .012. According to the results I put down the wrong answer, it should have been zero. Can someone jump in and confirm the correct answer and also explain it. Thanks for your help!

Problem: Hole dimension .250 with a tolerance of plus or minus .005. The actual hole size was measured at .255. The hole location tolerance is .002 MMC. What is the bonus tolerance allowed?

These were the answer options:

a) .002
b) .005
c) .012
d) zero
 
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T

True Position

#2
Re: When and how to apply Bonus Tolerance MMC

I had a test and answered this problem with .012. According to the results I put down the wrong answer, it should have been zero. Can someone jump in and confirm the correct answer and also explain it. Thanks for your help!

Problem: Hole dimension .250 with a tolerance of plus or minus .005. The actual hole size was measured at .255. The hole location tolerance is .002 MMC. What is the bonus tolerance allowed?

These were the answer options:

a) .002
b) .005
c) .012
d) zero
Are you sure you typed the question in correctly? It seems like those would all be wrong answers.
 
D

David DeLong

#3
Re: When and how to apply Bonus Tolerance MMC

First of all, your answer is wrong but so is your teacher's answer.

The actual diametrical tolerance zone tolerance is .012 but that was not the question. What is the bonus tolerance? It is the difference between the MMC size and the actual size. The MMC size of a hole is its smallest allowable size (not largest) and is .245. The difference between the actual size (.255) and its MMC size of .245 is .010". The bonus tolerance is a diametrical tolerance zone of .010.

Now, if the feature of size was a round pin rather than a hole, then the MMC size would be its largest and then zero would be correct. Give my answer to your teacher if you like.

GD&T is complex subject and takes a long time to understand it. Make sure that your trainer is certified as a ASME GD&T Professional in either Technologist or Senior levels.
 
D

David DeLong

#5
Re: When and how to apply Bonus Tolerance MMC

This is the actual problem.
My answer stays as is. The drawing is not to any ASME standards since the method of reflecting a datum is incorrect. Good luck!
 
L

lildee

#6
Re: When and how to apply Bonus Tolerance MMC

I would have picked .010 as the answer but it wasn't an option, .012 was the closest and that was what I picked.

How could the correct answer have been zero? I was thinking that for zero to be correct that the hole dimension was at its maximum hole tolerance, therefore the bonus tolerance for true position at MMC was not used. Make sense?
 
T

True Position

#7
Re: When and how to apply Bonus Tolerance MMC

I would have picked .010 as the answer but it wasn't an option, .012 was the closest and that was what I picked.

How could the correct answer have been zero? I was thinking that for zero to be correct that the hole dimension was at its maximum hole tolerance, therefore the bonus tolerance for true position at MMC was not used. Make sense?
The only way for the bonus tolerance to be zero would be for the feature to be at maximum material. If the feature was a pin, then 0.255 would be maximum material. Also, if the modifier was least material the zero answer would be correct.
 
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