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Found this in basement of new premises. Anybody know what this is?

Is the term 'Drill' still used and if it is doesn't Drill have it's own tolerance depending on drill size?

I am head of QC in a manufacturing company full of engineers and I am constantly arguing with the engineers especially the younger right out of school types about the correct way to detail their drawings. The latest concerns Datums. This engineer continually places Datums on cross sections...

We are trying to establish if the LMC call out on the attached is applicable in this situation.Detail 20 Thanks Elton Hughes Q C Manager Napco Security Grouphttps://files.engineering.com/getfile.aspx?folder=bc5e4bab-c5cc-4b19-a84c-c4f28ac719fa&file=MH121.jpg

We are trying to determine if the LMC called out on a drawing is truly applicable in this situation. Detail 20. Elton Hughes QC Manager Napco Security Grouphttps://files.engineering.com/getfile.aspx?folder=db9be8b2-4482-49cc-9ff5-6cb909d96d75&file=MH121.jpg

What are the rules for drawing revisions. I am head of QC Mechanical and work with design engineers who release a drawing without a revision and will make the first change a Rev A and others that start with Rev A when releasing the drawing.

We are trying to get a hardness comparison between Chinese 303, 304, US 416 and FN-0205-25. Any help wouls be greatly appreciated

Why use basic dimensions. Since these are theorectical in nature why use them? Many engineers I work with cannot explain a 'basic dimension' but they use them and then do not add a feature control frame. When confronted with this situation they tell us to use the block tolerances. It drives us...

I am fighting with some of my engineers that insist on using a centerline as a datum. I see nothing in gd&t that allows this. Am I missing something?

Does GD&T allow draft tolerances to appear in general notes as 1deg, 2deg etc. or must the dimensions be specified on a the drawing as a max and min.