minus-minus tolerance 1

[midnightblue]

I have a print that has a dimension 10 -0.11/-0.15 I think the range should be 9.89-9.85 another inspector told me the range is 9.74-9.85 which is correct.
Thank you for your help Magnet man

 

[pmarc]

You are correct.
9.85 to 9.89 is the right answer.

 

[ajack1]

Why did the other inspector think it might be 9.74? Just interested in their logic.

 

[midnightblue]

Thank you for your help the other inspector has a big ego and is never wrong

 

[midnightblue]

I was told by the lead insppector that the range is 9.74-9.85 the reason is that our vendor measured the parts at 9.880 & I am not sure whether to reject parts based on their results. I am measuring parts at 9.85

 

[midnightblue]

The ispector took the 10 subtracted .15 which gave him 9.85 then subtracted .11 from that giving him 9.74 I do not know where his logic is

 

[ajack1]

Thanks midnightblue, I had not thought of that but looking at the numbers I guess that is the only way you could come up with 9.74.

That is a pretty special way of thinking, especially for someone who is never wrong.

 

[powerhound]

Just echoing pmarc's response and verifying yours as well. 9.85-9.89 is the correct range.

John Acosta, GDTP S-0731
Engineering Technician
Inventor 2013
Mastercam X6
Smartcam 11.1
SSG, U.S. Army
Taji, Iraq OIF II

 

[juergenwt]

Midnightblue - Are we talking about inches? If "yes" than there is nothing wrong with 10" - .11/-15
You could list it as a "range" like some people have or you could list it as 9.89 (minus)-.04

However - if by chance we are talking metric than it would be in mm and under ISO 286 you could find many dim's with a plus/plus or minus/minus tolerance. Example: 10 P6 = 10mm -12/-21

Regardless - the inspector is wrong.

ANSI? Anyone?