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Hello Burunduk, is it correct for me to understand that in your drawing where the pins are used as locating features, it is independent of the outer surface of the device? So in an assembly, it will always fit but the outer surfaces may not align and one way to control that is to put an outer...

Ah didn't know that. Thank you. I guess it's time to switch from iso to asme.

Okay👍. Btw this might be dumb question but you mentioned that you used ASME Y14.5 in the drawing but I see that you used 3X instead of 3PLACES for specifying the pins but isn't 3X iso? Is it okay to mix standards that way?

Thank you Burunduk. Things make more sense now.

Thank you Burunduk. The datum A i guess is flatness but you have profile mentioned and also the profile feature 0.2 A B, is that necessary? I don't really care much about the inside face. Also the drawing follows iso standard if I am not wrong?

Yes, you are right about the datum A, it does provide stability and makes the most contact. I am open to pins being used to locate the part. Looking forward to your sketch. Thank you Burunduk. Here's how the assembly is if that helps.

Thank you Burunduk. So i am assuming this is what you meant? And on the right side drawing, I think the datum E is wrong from what I learned above.

It's a plastic part, polycarbonate

Finally I understand it.. Thank you very much guys.. So on the female part, (which is similar to the above part but instead of pins it has holes where the pins can go) do I dimension it similar to what i did above? And also do I need to provide an mmc on the holes? Also the part is injection...

Okay, 3DDave and chez311. I think I understand now. I have attached an updated file and I still have two ways to define the alignment pins. Are both right? Am I right to think that in the left drawing the alignment pins would be derived from datum B and would be biased to that surface and on the...

Why is the datum E wrong. Its at a distance of 14 from the top and passes through the center of the two alignment pins.

This is how the part looks for reference.

Datum feature C and F is supposed to be the centerline of the outer walls. Should I be mentioning the datum like the attached file then?https://files.engineering.com/getfile.aspx?folder=be92d3eb-920a-440f-ad0f-af4f5fefde26&file=SLOT-DATUM.tif

SO both the drawings are wrong? Or is it just the right side one?

I am trying to apply GDandT to alignment pegs/pins on an injection molded part. I made two different ways to define the pegs, are both correct? Is there something wrong with the right-side drawing? Thank you for taking the time to help...