Tolerance for fabrication
Tolerance for fabrication
(OP)
General tolerance for fabrication as per Indian standard.Fabrication means fabrication of supports using angles, channels, beams etc.Please inform Indian standard or International standard





RE: Tolerance for fabrication
Chris
SolidWorks 09, CATIA V5
ctopher's home
SolidWorks Legion
RE: Tolerance for fabrication
What kind of application are you talking about, are you talking construction or more like machine design or the like? For instance, I seem to recall an ex colleague that did some structural detailing say they worked to 1/16 or 1/8 of an inch or something like that.
I'll use machineries or similar for my initial estimates then information from vendors to refine it. For instance I used information from htt
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: Tolerance for fabrication
No standard's making organization can possibly have any idea what your design is.
It is the responsibility of YOU, the designer to assess your design and it's performance requirements and determine how much deviation from the nominal dimensions is permissible.
RE: Tolerance for fabrication
However, you also have to ensure that your tolerances can be achieved at acceptable cost. This is where there are some rules of thumb and in some cases there are indeed tolerance standars such as (the in my opinion flawed) ISO 2768. While I have to say that I think this particular standard may tend to swing too far toward suiting manufacturing at the cost of function, it does exist.
There's a big difference between designing to stay within "standard tolerances" that can be achieved at reasonable cost by almost any competant supplier (obviously looser isn't usually a proplem for manufacturing, I'm talking about tighter) while ensuring function and not considering tolerance at all and just relying on some industry standard, block tolerance or other rule of thumb.
The former should be encouraged, the latter should be outlawed
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: Tolerance for fabrication
Jim Sykes, P.Eng, GDTP-S
Profile Services www.profileservices.ca
TecEase, Inc. www.tec-ease.com
RE: Tolerance for fabrication
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: Tolerance for fabrication
If you design something that requires tolerances that cannot be achieved within the cost constraints of the project then the design is failed.
A good engineer or design must have an understanding of manufacturing process capabilities and the relationship between requiring a narrow distribution of variation and increasing cost, be it more tightly controlled manufacturing processes, or by scrapping lots of parts on the tails of the distribution.
RE: Tolerance for fabrication
The OP was poorly phrased and I thought that depending on what they actually meant there may be such a thing as a "standard tolerance" for specific applications. However, as I mention above for 2768 I'm not a fan that "tolerance standard".
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: Tolerance for fabrication
RE: Tolerance for fabrication
Jim Sykes, P.Eng, GDTP-S
Profile Services www.profileservices.ca
TecEase, Inc. www.tec-ease.com
RE: Tolerance for fabrication