yet more ISO tolerancing
yet more ISO tolerancing
(OP)
I know the ISO tolerancing thing has been discussed to great lengths here but......
I have a 120n6 mm shaft and a 120H7 mm bore.
The website below describes the tolerancing a little differently than what I have read before. Here is how they describe it.
120n6 shows as +45 and +23 in micrometres.
First limit is 120+0.045 = 120.045mm
Second limit is 120+(0.045 + 0.023) = 120.068mm
So the limits are 120.045 and 120.068.
120H7 shows as +35 and +0 in micrometers.
First limit is 120+0.0 = 120.0mm
Second limit is 120+ (0.035 + 0) = 120.035mm
So the limits are 120.0 and 120.035.
Is this correct?
http://w ww.roymech .co.uk/Use ful_Tables /ISO_Toler ances/ISO_ LIMITS.htm
Thanks.
I have a 120n6 mm shaft and a 120H7 mm bore.
The website below describes the tolerancing a little differently than what I have read before. Here is how they describe it.
120n6 shows as +45 and +23 in micrometres.
First limit is 120+0.045 = 120.045mm
Second limit is 120+(0.045 + 0.023) = 120.068mm
So the limits are 120.045 and 120.068.
120H7 shows as +35 and +0 in micrometers.
First limit is 120+0.0 = 120.0mm
Second limit is 120+ (0.035 + 0) = 120.035mm
So the limits are 120.0 and 120.035.
Is this correct?
http://w
Thanks.





RE: yet more ISO tolerancing
the shaft has a double plus tolerance and are not additive
meaning 120.045 to 120.023 120 plus .045 and 120 plus .023
bore is 120.000 to 120.035
ie may be a pressed fit at max material conditions.
RE: yet more ISO tolerancing
http:
click on "Fit Calculator" and enter your ISO tolerances.
Dimjim is right, your tolerances should look like this:
120n6 shows as +45 and +23 in micrometres.
First limit is 120+0.045 = 120.045mm
Second limit is 120+0.023 = 120.023mm
So the limits are 120.045 and 120.023
120H7 shows as +35 and +0 in micrometers.
First limit is 120+0.0 = 120.0mm
Second limit is 120+0.035 = 120.035mm
So the limits are 120.0 and 120.035
RE: yet more ISO tolerancing
Thanks for the url for the fit calculator.
RE: yet more ISO tolerancing
Kevin Hammond
Mechanical Design Engineer
Derbyshire, UK
RE: yet more ISO tolerancing
Software For Metalworking
http://mrainey.freeservers.com
RE: yet more ISO tolerancing
To control the loose fit it is better to select one of the parts H (h) and the other g, f, e... (G,F,E...)
The "farther" from H (h) toward A (a) is the second parts tolerance, the more guaranteed clearance the fit has; and the opposite is valid also - the closer toward Z (z), the more interference in the fit. The number in the ISO tolerance description (like 8 in the H8 tolerance) controls the total tolerance, the letter the location of that tolerance relative to the nominal size.
RE: yet more ISO tolerancing
http://www.megaupload.com/?d=WEQV0MOC