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how about a summary? :)

Actually I will like to get into that - in what occasions would I specify flatness tighter than parallelism? Won't that make parallelism redundant?

Hi Pmarc/weavedreamer. Can you explain this logic? If I define parallelism of 0.05 to a surface of flatness 0.05, won't my flatness tolerance be 0.1mm?

Hi, A very simple question. Is the picture attached sensible? (Parallelism of 0.05mm for surfaces that both have 0.05mm flatness tolerance) Either way - please try to explain why. http://files.engineering.com/getfile.aspx?folder=c22be41c-e1c1-4e73-bf93-49347073df69&file=Doc1.docx...

Soooo any clear answer on this? Should I just give 6mm x90 degrees?

Hi, Isn't there a table specifically for DIN 7991 etc.?

Hi, This is a long time misunderstanding on my part.. If for instance I have an M3 DIN7991 screw - what are the dimensions needed for the countersunk part? same dimension as the head? i.e. 6mm x90 degrees? Thanks

Hi, We have a system that functions at ~10^-6 Torr. Two of the gaskets we use are an Indium wire of 1mm. One is 350mm in perimeter and one is 280mm. Both wires are in a standard gland, and are tightened with 8 NC10-24 screws. Currently there's no torque specification for these screws, and I'm...

Hi, As the title says: Any recommendations for such a free software? Managing timelines, resources, priorities, etc.. Thanks!

Hi and thanks for your response. Disregard the center NPT hole. The NPT is just for a collet that will clamp the central instrument after positioning with a jig. I'm talking about the tolerances I need to give during the manufacturing of this part on a CNC. Regarding numbers - I'd like that all...

Hi KENAT, Thanks for your responses. I re-attached here the document in which I underlined in red the reference plane I'd like the holes to be relative to. Regarding the depth - I'd like them to be the linear dimensions +-0.05mm relatively to the virtual point annotated in the document. But...

Hi Kenat, Could you perhaps elaborate a bit? Maybe annotate an example of a functional datum. (A datum that I will define as very straight) and annotate what kind of basic dimensions I should give? How do I relate between the four holes?

Hi, I'm a bit confused as to how to define tolerances for four accurate holes pointing at a finite virtual point. (Picture attached) I'd also like that their depth will be toleranced between each other. What Linear and geometric tolerances should I define for such an application and how? I'm...