hexagon dimensioning with GD&T
hexagon dimensioning with GD&T
(OP)
I have this old Drawing.Is this the best way to dimension a hexagon using Gd&T .
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hexagon dimensioning with GD&T
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hexagon dimensioning with GD&Thexagon dimensioning with GD&T(OP)
I have this old Drawing.Is this the best way to dimension a hexagon using Gd&T .
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RE: hexagon dimensioning with GD&T
It is not horribly wrong, but it is not the way I would do it.
For starters, the dimension across the corners is wrong. This is controlled by the width across the flats. The number applies across the sharp corners, which almost certainly, will be filed down a bit, rendering your very accurate tolerance hopeless. You can apply a reference dimension. You can provide a detail to show how the corners are to be finished, with a resulting real dimension and tolerance.
It would be legal, however silly, to leave off the across flats dimensions, and apply a basic dimension across the corners to the theoretical points. You would have to apply a profile tolerance to the outline.
You need only one reference to the across flats dimension. Apply a 3X to it, and the positional tolerance. I would add a reference to datum_B to whatever feature control frame you use. Your tolerances are very accurate. I do not know your requirements, but this is way more accurate than you need for wrenching.
Consider using a profile tolerance to control your hexagonal shape.
RE: hexagon dimensioning with GD&T
Please take a look at following link:
http://tec-ease.com/gdt-tips-view.php?q=153
This might also help you to deal with the hexagonal feature. My additional remarks to this example would be that according to ASME Y14.5-2009 standard, the abbrevation for equally spaced feature should be EQLSP instead of EQSP, and the term BOUNDARY is optional, so it does not have to be there. If you have an access to Y14.5M-2009 standard you can take a look at fig. 8-24 to see how the combination of profile and position tolerances should properly look like.
RE: hexagon dimensioning with GD&T
RE: hexagon dimensioning with GD&T
"Good to know you got shoes to wear when you find the floor." - Robert Hunter
RE: hexagon dimensioning with GD&T
Mike Halloran
Pembroke Pines, FL, USA
RE: hexagon dimensioning with GD&T
I realize that the point I am raising is unimportant in regards to the OP, but it is not unimportant to the use of this forum. If corrections are to be recommended to agree with the standard(s), it is important that those recommendations are actually per the standard, and the correct standard needs to be referenced. Otherwise there will be a tendancy for the advice to be ignored, in the post in question as well as future posts.
I have much to learn about these standards even after using them for the last twenty five years, and can use all the help I can get when they are revised.
Yes I am being pedantic, but when it concerns following standards that is not necessarily a bad thing.
"Good to know you got shoes to wear when you find the floor." - Robert Hunter
RE: hexagon dimensioning with GD&T
See fig.4-38 in 2009 standard for equal spacing abbreviation.
RE: hexagon dimensioning with GD&T
As an aside, I really appreciate that the relevant paragraphs are listed in the lower right corner of the figures. That is a huge help in interpretation.
"Good to know you got shoes to wear when you find the floor." - Robert Hunter
RE: hexagon dimensioning with GD&T
EQ = equation
SP = space - as well as about 15 other things.
EQLSP = equally spaced
EQL = Equally
I'd guess 14.5-2009 reference 14.38a-2002 instead of Y1.1 for abbreviations but could be wrong.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: hexagon dimensioning with GD&T
FYI, in the new Y14.5 under para 1.2.2 "Additional Standards (Not Cited)" it lists Y14.38M-2007 for abbreviations.
Time for us to put in for a new update, huh KENAT. I'm not holding my breath.
"Good to know you got shoes to wear when you find the floor." - Robert Hunter
RE: hexagon dimensioning with GD&T
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: hexagon dimensioning with GD&T
Tunalover