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Flatness Callout Question

Flatness Callout Question

Flatness Callout Question

(OP)
I have never seen flatness this way on any of my prints. I assume it means a flatness of .0010 across the entire area and no worse of a flatness of .0005 in a 1mm x 1mm area? Yes the print is in metric. Any help on interpretation? Thanks!

________________________________
Ryan M
Quality Engineer
3d Printer Hobbyist

RE: Flatness Callout Question

Wow, just wow.

Out of curiosity, what made you think it was flatness?

"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future

RE: Flatness Callout Question

Much better now.

Your guess is correct, and also (F) means "free state"

The numbers look a bit uncomfortable; are you sure this is metric?

"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future

RE: Flatness Callout Question

(OP)
100% positive :) I wont dare say how wide this plate is. Trust me it is a bit ridiculous, these are precision ground ceramics, holding sub-micron or millionths of an inch of flatness happens now and then, just not normally over this size, and I have never seen it called out this way. Usually my print will just say flat to "x" number of helium light bands or something like that.

________________________________
Ryan M
Quality Engineer
3d Printer Hobbyist

RE: Flatness Callout Question

If you can't do it then no quote it. Nothing pisses me off more than getting a quote for a part, giving a purchase order and then the supplier comes back with exceptions. Just this week I got a call from a supplier who we have been working with for over a year asking what the tolerance is on a part with a profile of a surface call out. They are supposed to supply PPAP this week and they are just getting around to figuring out the print?!?!?!?

----------------------------------------

The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

RE: Flatness Callout Question

Here, here. Agree. What's the point of quoting a part if you can't actually do what the specifications on the print say? (Boggles my mind.)

SW Professional 2014 SP 5.0
SW Electrical 2D/3D SP 5.0
64 bit
Intel Xeon X(R) CPU 1603 0 @ 2.80 GHz
8.0 GB of RAM
NVIDIA Quadro 2000

RE: Flatness Callout Question

(OP)
I definitely agree with you. And we do have the capability, material, and measuring equipment. I had never seen the flatness callout with 2 values and never one that has something like the "1x1" next to it. Millionths of an inch, no problem. By best part is .000006 flat.

________________________________
Ryan M
Quality Engineer
3d Printer Hobbyist

RE: Flatness Callout Question

In a case like this, if you're capable of meeting the drawing specs, then I'd quote what it would take...but include a indicating that the price would drop by X amount if they could live with Y flatness tolerance. That's a polite way of questioning whether they really, really need it that flat (maybe they do, or maybe someone made a mistake).

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