Tolerancing Dispute
Tolerancing Dispute
(OP)
Can someone help me resolve an issue. When I use limits tolerancing, where it shows both an upper and lower dimension that a part can be made to, I'm used to showing the upper dimension above the lower. I'm now told that is incorrect and it should be reversed, showing the lower on top.
Is there an actual standard for this or is it just a matter of preference?
Thanks in advance
Is there an actual standard for this or is it just a matter of preference?
Thanks in advance





RE: Tolerancing Dispute
"(a) Limit Dimensioning. The high limit (maximum value) is placed above the low limit (minimum value). When expressed in a single line, the low limit precedes the high limit and a dash separates the two values.”
Hope this helps.
GDTGUY
RE: Tolerancing Dispute
RE: Tolerancing Dispute
RE: Tolerancing Dispute
RE: Tolerancing Dispute
RE: Tolerancing Dispute
RE: Tolerancing Dispute
RE: Tolerancing Dispute
http://members.asme.org/catalog/ItemView.cfm?ItemNumber...
"Wildfires are dangerous, hard to control, and economically catastrophic."
Ben Loosli
CAD/CAM System Analyst
Ingersoll-Rand
RE: Tolerancing Dispute
RE: Tolerancing Dispute
RE: Tolerancing Dispute
My Boss has to have everything the old
way. As he says the people in the shop
can bearly understand english and he
doesn't want to change anything.
Its hard because you get trained under
the new ANSI standards and some of the
Engineering Managers don't like it so
they don't use it. They continue to
use the old way to make things simple
for the people in the shop and themselves.
RE: Tolerancing Dispute
Many high end software programs do not allow deviation from the ANSI/ASME standard of large dim on top.
Personally I do not like using "limits" Most machinists/programmers will shoot for the median dim. The true tolerance also is not always obvious. This requires someone to recalculate this figure allowing more room for error.
I prefer the "even plus/minus standard". The median is obvious as is the tolerance.
(This is just an opinion of 30+ years of engineering and machining.)
procadman2
Proe Design & Admin
NASA Contractor
"You can't build a reputation on something you haven't done."
H Ford
RE: Tolerancing Dispute
One company I worked for wante the +/- tolerancing so much in manufacturing that all our dimensions were that way. The only way to maintain our design intent and tolerancing for some parts resulted in 5 digit numbers. Manufacturing had a cow...but it was what they asked for.
Sticking with topic...GDTGUY is correct in his statement per the standards.