ISO Symmetrical Question
ISO Symmetrical Question
(OP)
Please ref to the symmetrical callout on the figure attached, its an ISO standard of a M14X1.5 Hex Flange Bolt. What's the meaning of T/2 on the FCF tolerance compartment?
Thanks for all helps
Season
Thanks for all helps
Season





RE: ISO Symmetrical Question
RE: ISO Symmetrical Question
Total tolerance zone will be 0.54. Why? I have no idea. Maybe it makes calculating tolerance stack-up easier - you can see quickly which tolerances should be split in half.
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: ISO Symmetrical Question
Balloon n4 means particular marking method with reference in general note 4.
RE: ISO Symmetrical Question
I found mention of "radius" tolerance zone used alongside with "diameter" in GD&T on some Chinese factory site: http://www.iron-foundry.com/geometric-tolerance-sy...
So, it looks like something very old and/or very local.
AK, you seem to know the most about it. What are the advantages of using "half-tolerances"?
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: ISO Symmetrical Question
“T/2” is radial value. It is true for Symmetry, Tolerances of Profile, Positional and special term Cross Axes. "T/2" usage is quite common for symmetry on the represented drawings according to GOST.
IMHO there are no any advantages of using "half-tolerances" except the confusions with symbol R applied for non revolved features.
RE: ISO Symmetrical Question
CH
OEM customer in Europe, the Note may be helpful for you, but I can't read it.
AK
Would you please re-post the general note 4, it looks upside down.
Season
RE: ISO Symmetrical Question
Your post is right, the problem is I can't read it.
Season
RE: ISO Symmetrical Question
Should be something like this:
1. Steel 4140 or something very close, Class 10.9 Hardness HRC 32…39 per ISO 898-1
2. General tolerances: outside dim’s H14, inside h14, other +/- IT14/2
General tolerances of form ISO 2768-2 H
3. Coating: Phosphate dipping
4. Mark manufacturer ID and Class
5. Other requirements per ISO 4759-1-2009 grade A
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: ISO Symmetrical Question
Just confirm the translation is correct. One comment regarding to general surface roughness, I guess you can see this symbol in upper right corner on the drawing.
The meaning is the same as general surface roughness max. allowed value unless otherwise specified.
RE: ISO Symmetrical Question
Season
RE: ISO Symmetrical Question
http://en.wikipedia.org/wiki/GOST
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