Center line callout symbol placement
Center line callout symbol placement
(OP)
I recently started a new job and a co-worker and I are having a debate about if the center line symbol (C&L)should be placed on the line or not. Is there a standard for this or not? I've attached a example. Thanks in advance for any help.
LaMonte B.
LaMonte B.





RE: Center line callout symbol placement
Per ASME Y14.5M-1994 2.7.3, just showing items aligned etc. implies no relationship/tolerance, which I believe CL was often assumed to imply.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Center line callout symbol placement
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Center line callout symbol placement
As far as location, I wish I had such issues to debate.
"Good to know you got shoes to wear when you find the floor." - Robert Hunter
RE: Center line callout symbol placement
OK, now to the next topic. The CL is no longer a standard symbol. It's not disallowed by the standards, but it is also not supported by the standards. If you intend to use the CL symbol (or any symbol not supported by the standards) at your company, a definition should be stated somewhere that everyone can find. At my last company, we defined all special symbols in the general notes when they appeared on the drawing.
Is CL needed? Sometimes, it helps, but it is never really needed. Why does it sometimes help? Because you may have a drawing view with many centerlines (through various features that lend themselves to the use of centerlines), and you may wish to identify the centerline that represents the center of the part itself. You can use CL to do that.
Finally, your drawing looks like a SolidWorks drawing. (It doesn't matter if it is not...I'm just going to use SolidWorks as the example.) For horizontal lines, just use the CL as is. But for vertical lines, you may wish to rotate the CL about -20degs (an option available in the PropertyManager for the annotation note). This will avoid having the vertical line in the L disappearing on the centerline.
Matt Lorono, CSWP
Product Definition Specialist, DS SolidWorks Corp
Personal sites:
Lorono's SolidWorks Resources & SolidWorks Legion
RE: Center line callout symbol placement
RE: Center line callout symbol placement
I do agree with his recommended placement though, if the symbol is going to be used.
"Good to know you got shoes to wear when you find the floor." - Robert Hunter