Tolerance decimal placements

I guess the question I have is "Why?".

Matt

My bosses want it to look a certain way that's displayed in our catalog (+0.005 to -0). Does 0.000 indicate a level of precision different than 0? That's what they're concerned about.

There are NO degrees of nothing. zero = nothing. 3 zeroes = nothing. Therefore zero = 3 zeroes = nothing.

Reaper.

ANSI Y14.5 states that for inch dimensions the prime dimension and the tolerance that applies to it shall be quoted to the same number of decimal places ie 5.000 +0.010/-0.005.

This does not apply to millimeter dimensions.

This of course only applies to drawings, your catalogue your rules!

---------------------------------------------- Posted with NewsLeecher v1.0 Final * Binary Usenet Leeching Made Easy *

Thank you. What about if the prime dimension is a fraction. So, for your previous example, is 5" +0.010/-0.005 accurate? And if so, can the two variations of the tolerance have different decimal placements? Can I do this in Solidworks: +0.01/-0.005

I believe that Solidworks complies with ANSI 14.5 so NO you cannot do that. There may be a way of overriding it, but....??

This is what ANSI Y14.5 states:

.500 +/-.005 is good .50 +/-.005 is not good

.500 +.005/-.000 is good .500 +.005/-0 is not good

.750/.748 is good .75/.748 is not good

Take note, a zero is not places before the decimal point on values less than one inch.

To the best of my knowledge fractions are not allowed under ANSI Y14.5, only because I dont see any reference to them.

---------------------------------------------- Posted with NewsLeecher v1.0 Final * Binary Usenet Leeching Made Easy *

Could you please explain the rationale in the first and last example?

1) five hundred (500) +/-.005 is good fifty (50) +/-.005 is not good 3) seven hundred fifty (750) /.748 is good [that's a huge tolerance!] seventy-five (75) /.748 is not good [that's still a huge tolerance!]

What's missing here?

There are rules for fractional tolerancing as well, but these are not what is being asked about.

Bruce, I think you missed the decimal point. it's 1/2", not 500 and

1. ...and 3/4", not 750 and 75.

Matt sw.fcsuper.com

cadout,

Ditto to the other response. The proper Ansi way is keep the decimal places the same throughout the dimension. If you are using inches in your catalog, and use uneven decimal places, there's actually a chance customers may mistake your drawing for metric, which would not be a good thing at all.

Matt

Hi Bruce, I cant explain why but the decimal point didn't show up, they should be point 500

--

--------------------------------- --- -- - Posted with NewsLeecher v3.7 Final Web @

----- ---- -- -

Thanks for all the input. I appreciate it, will pass it along.

No decimal points showed on my screen. That's why the question.