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One other small thing.. you call out 1/4-20 UNC but what class? 1/4-20 UNC 2B? 1B, 3B? Also a depth of ±.010 is a bit tight, perhaps .75 min would be more mfgable.

I am curious if anyone has had any experience what the wear characteristics of using Acetal gear on an anodized aluminum boss. The forces are very light ~4in-oz. I have a acetal gear with a 10 mm bore and instead of using bearings it would be nice to just machine the boss in the existing...

How do you show a basic dimension on a view that does not have the datum feature shown. Do you draw in a center line in space and attach a basic dimension to it? How do you handle this? Do you follow the new 2009 convention X[A,B,C]? We have not adapted this yet as it will clutter the drawing...

Troy, We have the same issues. Picking functional datums on components which have very few straight edges can be a challenge. Often times we find using the functional surfaces will not provide a repeatable results. In your case I would use the following if you want to check it unrestrained...

We use a bit of both, for example if a hole pattern needs to be held tighter then we would use regular dimensions between holes and only use ordinate dimension to one of the holes in the pattern. GD&T makes either method good as the dimensions become basic dimensions with no tolerance associated...

MechEng2005 - you are correct, I made a mistake in my illustration for question 2... option "B" should read .250 NOT .280… my first mistake of the year, dang I personally would say for question 1 B and B are the more correct answers as most agreed. But to know what is 100% correct is key, yes...

Thanks for all your help, this is leading to what I expected, and KENAT nicely leaded into my next question. To me the standard can be a bit fuzzy so your help is much appreaciated. Quote (ASME Y14.5M-1994 1.8.9 of ): "The depth dimension of a blind hole is the depth of the full diameter from...

Are thread depths the same as counter bores in there interpretation? Is either slot callout correct? Please view the attached pdf and let me know which are the correct callouts.

So whats correct according to Y14.5?

I have seen one customers drawings come through with a call out like the following and it drives me nuts: .138-32 UNC-2B 3X To me it seems in order to comply with ANSI/ASME Y14.5M-1994 you should call out the above like this: 3X 6-32 UNC-2B In section 1.9.5 (repetitive features or...