Strightness Tolerance
Strightness Tolerance
(OP)
Hi Guys,
Is there a standard some where on the Straightness on a aluminum street light poles. Iam looking to specify on my drawings for for various heights of poles.
Thanks
GC
Is there a standard some where on the Straightness on a aluminum street light poles. Iam looking to specify on my drawings for for various heights of poles.
Thanks
GC





RE: Strightness Tolerance
Is there any reason why there should be a standard on how straight lampposts are? I would guess that most of your requirement would be aesthetic.
--
JHG
RE: Strightness Tolerance
see table 3 in http://bsl.lacity.org/downloads/business/bluebook2...
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RE: Strightness Tolerance
see also:
http://yzjyds.en.alibaba.com/product/871171900-212...
http://www.onemotoring.com.sg/publish/onemotoring/...
http://www.ausgrid.com.au/~/media/Files/Network/Do... this has the spec buried in an Australian standard, presumably AS 2209 Timber Poles for Overhead Lines, or AS 4065 Concrete Utility Services Poles, or AS 4677 Steel Utility Service Poles
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RE: Strightness Tolerance
However, I fear this isn't answering the OP's real question.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Strightness Tolerance
RE: Strightness Tolerance
RE: Strightness Tolerance
Not sure which paragraph you are referring to, but the discretion phrase in:
"3. Straightness - At a frequency determined by the Engineer, Standards will be tested for straightness. Standards shall be sufficiently straight when in a vertical position such that the maximum deviation from a string line on the face of the Standard in a plane passing through the longitudinal axis shall not exceed the tolerance listed in Table II. At the discretion of the Inspector/Engineer, such tests may be conducted at the place of manufacture, or at the project site following erection."
applies to where/when the straightness is tested, and Table II, which points to Table III, is only discretionary for poles longer than 40 ft.
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RE: Strightness Tolerance
RE: Strightness Tolerance
Thank you very much for sharing so many references. I now believe that its not only the straightness that I should be worried about, its the fabrication tolerance also. See attached picture of 2 poles. They both appear stright, except that one of them have the base welded slightly angle. So the whole pole is appearing tilted. I guess I should use 2 GD&T control.
1. Straightness control
2. Perpendicular control
In some applications, the perpendicular doesn't matter because there are leveling nuts. But in applications where there are no leveling nuts (Directly mount), the perpendicular does matter.
Thanks
GC
RE: Strightness Tolerance
1. Do you understand the implications of 'rule 1' 'envelope principLE' 'Taylor principLE' or whatever you want to call it to your situation? Are your drawing dimensions etc. set up in a way to take advantage of it?
2. What is your process capability - just throwing straightness and perpendicular controls without understanding this (and of course functional requirements) may just increase the scrap rate.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Strightness Tolerance
Yes, makes a lot of sense. In my case I should need to follow the shaft method. Good point KENAT, I can see how we could be rejecting some actually good parts.
RE: Strightness Tolerance
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Strightness Tolerance
I've never seen aluminum light standards used much in southern California. I've seen concrete light standards commonly used on residential and city surface streets, but most light standards over 25ft or so (highways and freeways) all seem to be fabricated steel. The unfortunate reality in southern California is that aluminum poles would likely be stolen and sold for scrap.
RE: Strightness Tolerance
TTFN
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RE: Strightness Tolerance
However I've veered off topic sorry.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?