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forgot to add, in the additional callouts, datums B and C are the pins themselves, sorry.

I dimension the pins as follows: (note that this is for 2 round pins with 2 holes, as opposed to diamond pins and/or 1 hole and 1 edge for location) 2x dia. PPPP+/-.0001 pins |TP|dia.0016 M | A | with A as the flat mating surface. The PPPP size = a commonly available pin size, such as .1250...

The way I see it, back when I was making a drawing of a part in AutoCAD I didn't try to show tangency lines, why should I show them just because I can do so easily using Solidworks? I think it is a rare drawing that benefits from showing tangency lines. Just my 2 cents.

Matt that's true it goes a little beyond the OP's post. For what it's worth, I agree that one should only call out the chamfer if/when it is needed, and even then rarely on both sides of the hole. Just trying to provide a little extra info. to those that might not know this rule and/or realize...

per asme b18.3 "it is considered good practice to countersink or break the edges of holes which are smaller than (D Max + 2F Max)in parts having a hardness which approaches, equals or exceeds the screw hardness. If such holes are not countersunk, the heads of the screw may not seat properly or...

Solidworks includes the all around symbol on thier available leader styles, so it's easy to apply to any field note. Not sure if it's correct or not, however. I also kind of don't like it because the 1st time I went to apply the all around symbol to a profile tolerance, it took me forever to...

from DRM "An interface control drawing shows physical and functional interface engineering requirements of an item which affect the design or operation of co-functioning items. These drawings are used as design control documents, delineating interface engineering data coordinated for the...

By that logic a tapped hole is a hole, and those tolerances (i.e.: .XX = +/-.005) seem a little loose. In other words if a drawing calls out Ø.25-20UNC-2B, doesn't the title block allow too much tolerance for minor, major and pitch diameters?

per 6.5.4, In most cases, profile of a surface tolerance requires reference to datums in order to provide proper orientation, location, or both, of the profile. With profile of a line tolerance, datums may be used under some circumstances but would not be used when the only requirement is the...

Hi I'm Ed I am new here and rather new to GD&T but would like to try my hand at answering SeasonLee's question. I think that datum lines X and Y are established along the leftmost and rightmost edges of the part, at center, in the areas defined between points X and Y on the right and between...