This is probably very basic stuff, but can someone point in to some rules of how to interpret a drawing like this?
What diameter to expect. See attached pdf.
https://files.engineering.com/getfile.aspx?folder=742d1276-14b0-45f2-b03a-a608aa48a5bd&file=Reading_drawing_2768_with_minus_tolerance.PDF
The hole axis is the axis that the polygon need to be concentric about.
Thanks for clearing up the datum reference feature.
Flatness in combination with parallelism does not seem to be controlled on my drawing?
Parallelism is measured over the whole surface but the angle does not control the...
I raised the question about which standard we work on (recently hired)
I need a center hole through the part and thought this might be a good way to control the geometry. The hole sets the datum A which is then referenced for symmetry, perpendicularity and parallelism in different view...
Thanks Hallec, chez311 and SEM_D220. Lots of great response at this forum, glad I registered [bigears]
Reason I added center lines on Method 2 was due to symmetry, but then I thought center lines might make method 1 easier to read as well, and wanted to hear your comments on it.
Did not know...
Thanks for your great replies.
I have a new image with some corrections on the 3 methods. I will have a closer look at this when I get home.
I followed some advice here and put some basic dimensions and center lines in there.
Some questions in the image.
For example, center lines between...
Thanks! Didn't know they were removed. That's ASME right? Couldn't find anything (free) concerning ISO so will have to lookup if it is removed there too.
Facet-to-Facet tolerance is the most critical form, maybe I can combine method 1 with a 60°±0.01 dimension for the polygon sides. Or might be...
I'm new to GD&T. What's your approach of tolerancing a polygon shape.
'Profile of a surface' as in option 1 locks down a lot.
At first I thought it looked down too much so I tried Method 2 using symmetry, which in the end pretty much did the same as profile of a surface.
Then I thought of...
