Engineering Drawing Notations
Engineering Drawing Notations
(OP)
I'm really having trouble locating standard notations for engineering drawings.
The biggest problem I'm having right now is understand crosshair notations for holes. I'm trying to interpret a 20 year old Mylar from Canadair (Bombardier Aerospace)
Its hole locations for a 0.190" Al 2024 part, identified by a + with numerous notations
Here are some examples
BB|4N
-----
CC|
BJ|5
-----
|
BA|5F
-----
C|
AO|4F
-----
|4
For example the number in the top right would be the dia. in 32nds, I think, C stands for countersink in the bottom left. But I really dont understand the top left? Or unless Im reading this completely wrong
Any idea????
The biggest problem I'm having right now is understand crosshair notations for holes. I'm trying to interpret a 20 year old Mylar from Canadair (Bombardier Aerospace)
Its hole locations for a 0.190" Al 2024 part, identified by a + with numerous notations
Here are some examples
BB|4N
-----
CC|
BJ|5
-----
|
BA|5F
-----
C|
AO|4F
-----
|4
For example the number in the top right would be the dia. in 32nds, I think, C stands for countersink in the bottom left. But I really dont understand the top left? Or unless Im reading this completely wrong
Any idea????





RE: Engineering Drawing Notations
This is actually a rivet identification callout.
BB represents a specific rivet
4N represents the length and the mfr head is near side
CC represents that the rivet is double flushed
Look at spec nas523 Rivet Identification Spec
Hope this helps...