trailing zeroes and tolerances
trailing zeroes and tolerances
(OP)
I am in a quandry. I have a part 1660 mm long. My titleblock says, " Tolerance 1 place decimal +/- 1 "
Yet, I have a whole number per 1.6.1(b)of Y14.5.
Do I put 1660.0 on the drawing? Or leave it 1660?
Thank you in advance.
Yet, I have a whole number per 1.6.1(b)of Y14.5.
Do I put 1660.0 on the drawing? Or leave it 1660?
Thank you in advance.
teddykaye





RE: trailing zeroes and tolerances
Per ASME Y14.5M-1994 section 1.6.1 mm dimensions do not have trailing 0's so you can't simplistically use the type of block tolerance that varies by number of decimals.
What tolerance is required by function? Don't over rely on block tolerances just because they are there.
Mixing mm dimensions with inch tolerances also looks like a recipe for disaster.
Without knowing more information I'd be tempted to directly tolerance your part.
KENAT,
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RE: trailing zeroes and tolerances
As Kenat said, over reliance on tolerance block tolerances is a bad thing especially if they impose tight tolerances.
RE: trailing zeroes and tolerances
Systematically apply tolerances to metric dimensions. You will be surprised at how little extra time it takes. Your drawings and designs will all the better for you taking a few extra minutes to think things out.
RE: trailing zeroes and tolerances
RE: trailing zeroes and tolerances
RE: trailing zeroes and tolerances
RE: trailing zeroes and tolerances
Sheevaraam, you cannot use decimal place holders for tolerance on metroc drawings like in your example:
"1660 +/- 2 or 1660.0+/- 0.5".
It would be:
1660 +/- 2 or 1660 +/- 0.5
You may also want to look at ISO standards for the metric classes of tolerance. A dimension of 5 would have a different tolerance than a dimension of 150 or 1660. Yet, they are all 0 decimal places. It does make sense if you think about it.
"Wildfires are dangerous, hard to control, and economically catastrophic."
Ben Loosli
RE: trailing zeroes and tolerances
And appologies for my comment about mixing metric & inch, I realize now the " was part of the quotes not indicating inches.
KENAT,
Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: trailing zeroes and tolerances
Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group
RE: trailing zeroes and tolerances
RE: trailing zeroes and tolerances
thanks to all for your comments. even the 'edgy' ones!
teddykaye
RE: trailing zeroes and tolerances
RE: trailing zeroes and tolerances
Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group