Pipe With Hole Features - Hole Alignment in Symmetry
Pipe With Hole Features - Hole Alignment in Symmetry
(OP)
I'm new to GDT, and I can't seem to find the answer to my question. Even though it's probably right in front of my face. I know there are a lot of great people here that share good information, so I'm hoping someone here can take pitty on me and help.
I have a length of pipe. Each end face has a cirular pattern of holes drilled into it. How do I specify that the patterns at each end of the pipe must be oriented (clocked) such that the axes of symmetry of the holes at the opposite ends are coaxial?
There are no features on the pipe other than it's inherrent cylindric ones, so I can't refer to any particular feature as a datum to specify absolute radial positions for the holes. All I could do is use the location of one of the holes in the pattern at one end of the pipe and use that as a datum, but is that legal?
I'm new, and I'm stumped.
I have a length of pipe. Each end face has a cirular pattern of holes drilled into it. How do I specify that the patterns at each end of the pipe must be oriented (clocked) such that the axes of symmetry of the holes at the opposite ends are coaxial?
There are no features on the pipe other than it's inherrent cylindric ones, so I can't refer to any particular feature as a datum to specify absolute radial positions for the holes. All I could do is use the location of one of the holes in the pattern at one end of the pipe and use that as a datum, but is that legal?
I'm new, and I'm stumped.





RE: Pipe With Hole Features - Hole Alignment in Symmetry
RE: Pipe With Hole Features - Hole Alignment in Symmetry
http://www.eng-tips.com/threadminder.cfm?pid=1103
RE: Pipe With Hole Features - Hole Alignment in Symmetry
For example, call SECTION A-A the left hand end of the pipe showing a cross section of the hole pattern. Call zero degrees vertically upwards and put the angular orientation of each hole relative to that reference position.
Call SECTION B-B the right hand end of the pipe with the cross section through the hole pattern. Label each hole position relative to that vertically upwards.
On the print through each section draw a leader and say "HOLE ALIGNMENT IMPORTANT". I typically place a note visible on the print to say "HOLE ORIENTATION AS NOTED".
Done.
Regards,
Cockroach
RE: Pipe With Hole Features - Hole Alignment in Symmetry
Thank you Cockroach, and dhengr for your replies. I thought about referencing a view orientation, but I just wasn't sure if that was legit. But, now that you explain it, that's exactly what I'll do.
RE: Pipe With Hole Features - Hole Alignment in Symmetry