Positional tolerance (Planar)?

[brian.freeman]

Picture1.pngI have this drawing that has 3 positonal tolerances (all holes .098) with no diametric symbol, so I'm to assume they want a planar position. Problem I'm having is that is doesn't specify a 'direction'. Do I assume that the primary plane is going to be the zone for the tolerance or would I choose any other axis and report the results?
What are your thoughts?

[RanDawgg]

If you have the option, I'd first see if that is truly what the designer intended. Is it an old drawing?

[brian.freeman]

2001 drawing
.014 (M) ABC No diametric symbol. Just an 'arrow' to the location of the holes.

[Schlag]

I would normally "assume" the Ø. On an older drawing you may or may be get feedback. This usually depends on the company and engineer involved.......

See pages 124 and 126 in Y14.5 / 2009 OR page 207 / 208 in Y14.5 2018

[brian.freeman]

Per the title block, Y14.5M-1982 (1988)--Dang that's old.
But they would still have to indicate the 'direction' of the tolerance, right?

[Schlag]

Page 139 and 143 in the Y14.5 1994 standard. 1982 would have been the governing standard at the time. I don't have a copy of that one !

[RanDawgg]

If ABC controls all degrees of freedom, I think it is safe to assume they intended a diametrical tolerance zone. I'd still point it out to someone involved though.

[brian.freeman]

I agree, we up channeling this to our Quality engineer, to see what the designer actually wants.
Thanks