Reporting decimal values 4 places on a 3 place tolerance dimension
Reporting decimal values 4 places on a 3 place tolerance dimension
(OP)
Is it common practice to report/record 4 decimal places on a 3 decimal place dimensional drawing callout?
Example: .075 +/- .001 , would you record to the 4th decimal place ( .0753 ) to show all deviations?
Example: .075 +/- .001 , would you record to the 4th decimal place ( .0753 ) to show all deviations?





RE: Reporting decimal values 4 places on a 3 place tolerance dimension
I would record whatever the tool indicates.
Chris, CSWA
SolidWorks '15
SolidWorks Legion
RE: Reporting decimal values 4 places on a 3 place tolerance dimension
If using hand tools... I would look at ya funny for using micrometers out to 4 places on a Ø.063±.005 dim.
But if it's Ø.063±.005 and you're close to the top end and don't want to scrap the parts... you pull out the micrometers and you measure .0679"... beautiful. Just make sure your stuff is calibrated/certified to read what you are reporting.
Remember Ø.0680000000000000001 is an out of spec part for Ø.063±.005 per ansi y14.5 which shoots ya over to ASTM SI10.
BTW... I would love it if someone proved me wrong on that one because I hate saying that I measured something with a .0001" micrometer that says .0680" is a bad part just because you can't prove it's not over.
RE: Reporting decimal values 4 places on a 3 place tolerance dimension
The day that happens is the day someone wakes up to all the 90 degree angles between surfaces of parts that they haven't been adding into the reports either. A rectangular block has 12 of those to measure if it isn't controlled with FCFs.
RE: Reporting decimal values 4 places on a 3 place tolerance dimension
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RE: Reporting decimal values 4 places on a 3 place tolerance dimension
We do have some customers that demand all quality reports show 'actual values' to the same precision as the dimension. So a 3-place dimension gets reported as a 3-place actual condition. It's up to us to know that .7605 is not acceptable to report as .760 if the tolerance is .740-.760 - I think that's a risk they take, in my opinion, but it's not my place to say. I am betting they have other suppliers less-rigid as we are, who may just round it and call it good.
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NX8.0, Solidworks 2014, AutoCAD, Enovia V5