1. ## GD&T understanding problem

hello every body.
can any one understand me about GD&T . i am facing problem to interpret this dimension on given drawing.check jpeg for drawing will be very thankfull in advance.

2. Indicates position but no datum and it's to unknown value of .02 diameter. Unknown could be .01 dia. + .01 of .015 tolerance. Bad print. Good Luck..

3. This is my take on what you have... 10 is the diameter, can be over by 0.015, can be under by 0.000. The depth is 20. The center of the holes can be up to up to 0.02 away from the dimensioned centers in any direction.
This is a link to a glossary or symbols: http://www.tec-ease.com/gdt-terms.htm

Hope this helps... James

4. That is one of the worst prints I've ever seen. I have no problem with the little boxes, but they are missing tons of info. You have a tolerance on the hole, that's fine, but you have true position,(the target symbol) within .020, but to what?????

There are no datums, what I would expect on a print like this is the 100.00 to be -A-, the 30.00 to be -B-, and one of the holes to be -D-(with a few boxes on -D-). Then the rest of the holes would have the same callout you have, except there would be more boxes, and more symbols. Pretty much true position to -D- within .020, and then position to A within .005.

Hopefully you get the M with a circle, not the S with circle. The M with a circle gives you a bonus, the S with a circle is just a pain or a part function I'm not privy too.

Go get yourself Ansi 14.5, there may be more letters and numbers attached to the spec and its been revised about 45 times, but most likely it is referenced on your print if its using GD&T, or at least it should be. It lays it all out for you.

Sorry, but if that is the print your customer supplied, they suck.

5. Not to mention the chain dimensioning of all the circle locations. That is a no-no. Should be from one of the corners (bottom right in this case).