"Equally Spaced" 3

[avc8130]

I am currently reviewing drawings drawn to 14.5-1973. I am finding the "Equally Spaced" used quite often to call out holes around a Basic circle. We are having a discussion over how the positional tolerance applies. Does the "Equally Spaced" get treated as a Basic callout and the positional tolerance apply on the circle after the equally spaced math is done? Or does the tolerance in the title block apply to the "Equally Spaced" and then the positional tolerance only applies to the holes location on the pattern circle?
Thanks,
Anthony

 

[ctopher]

"8X 30 deg" can mess up alignment if you add up the tolerances.

Chris
SolidWorks/PDMWorks 08 2.0
AutoCAD 06/08
ctopher's home (updated 10-07-07)

 

[KENAT]

Chris (no smiley so I'll assume you're being serious) Not if you're using basic with position which is what btrueblood is talking about. Then 8 X 30° is correct and matches the examples in the standard.

I agree with btrue, (I think I said as much in a previous thread on the topic) don't use 'Equally Spaced', dimension it per the examples in 14.5.

While 'Equally Spaced' may not be explicitly forbidden/wrong, it can be confusing, hence this thread.

KENAT, probably the least qualified checker you'll ever meet...

 

[CheckerRon]

HUH? Not if it's 8X 30° BASIC.

 

[CheckerRon]

Conclusion. "Equally Spaced" should have gone out with bell bottom pants and leisure suits, or stayed only in architectural and structural drafting. Maybe they don't even use it much anymore.

 

[ewh]

Ok, btrueblood. Maybe the concensus is against using it. I can live with that, and am willing to put the angular dimension in, as long as it isn't an already cluttered or crowded drawing. It all depends on which way makes for easier (correct) interpretation.


Believe it if you need it or leave it if you dare. - [small]Robert Hunter[/small]

 

[ctopher]

Kenat,
You're correct.
(I'm done for this afternoon, not feeling well)

Chris
SolidWorks/PDMWorks 08 2.0
AutoCAD 06/08
ctopher's home (updated 10-07-07)

 

[aardvarkdw]

When in doubt, leave off text notes in your dimensions. They only add confusion if you abbreviate something differently than someone else. That is the whole reason that there are standardized hole note symbols now (depth, counterbore, countersink, etc...). Case in point, EQ SP and EQLSP.

David