What does it mean when you put the MIN or MAX suffix on a dimension, what would the limits of size be for it. And do you know where you can find information on it.
MIN suffix means that when measuring the finished product that specific radius or radii cannot be less than .010, without any care about the upper limits basically "up to the machinist" or whoever is reading the print to make the part. MAX suffix is just the oppisite.
Putting this into reality: If you had an outside corner radius that was listed as .010" MIN that could mean that something is fitting around it with an inside corner or radius, if that .010" radius were to get smaller, that outside corner would then become sharper and could cause fitment issues with the object it goes into. By putting the MIN suffix the designer is saying that he/she doesn't care how big of a relief radius is put into the part, as long as it is atleast .010"
There are many types of tolerances (min/max/bilateral/symmetric) and then a lot of tolerance applications in Geometeric Tolerancing.
There is a chapter in my old Machinery's Handbook dealing with tolerances. Mine is pretty old, but I would imagine it is even better in the newer editions. I would check to see if a co-worker has one of these because they can expensive to buy.
You could very likely find some great info on the 'net also.
I have a 28th edition machinist handbood, but I can't seem to find it in there.
Chris, that is how I see it also, that is the way that I have always interpreted that, but I have some one telling me that since it is a .xxx place decimal that it has an inherant ±.005 tolorance, and since it has a MIN attached to it it made my tollarance +.005 -.000.
I am pretty sure that I am right, but I would like to have some documentation backing me up.
I have even looked in the Dimensioning and Tolerancing Handbook my McGraw Hill and can't find anything on it.
my fear is that it is such a simple, and implied concept that there is not really anything written on it.
You are correct about the understanding of MIN/MAX however in most situations a bilateral tolerance should be used instead. There is very few situations that a MIN or MAX are appropriate. I don't have a handbook here with me to scan a page though. If you or someone feels that +.005 -.000 is too tight on the .010 radius you could put a bilateral tolerance of .010 +.010 / -.000 instead. I know a link to another forum that has a good conversation on this topic, I don't know the rules here about linking to other forums so I'll pm you.
thank you Chis
it is answered in ASME Y14.5M-1994 section 2.5
it states that it is placed on dimensions where other elements of the design definitely determine the other unspecified limit.
You and Chris are correct in your interpretation. Most title block tolerance specs have (or should have) a statement "unless otherwise specified" in it. The fact that the dimension tolerance is listed as MIN is over-riding the field tolerance (at least for the Min direction).
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