[Cl...] Posted January 9 Share Posted January 9 I have a drawing calling out a (bi-lateral) position of a curved 3d surface. similar to a bowl. I get these types of parts all the time and normally this surface is called out as surface profile. The surface extracts as a torus. I'm baffled. Any ideas? I think the drawing is wrong. Link to comment https://qualityforum.zeiss.com/topic/25515-weird-gdt-callout/ Share on other sites More sharing options...
[Pa...] Posted January 12 Share Posted January 12 I don't know why Surface Profile would not give all the necessary information; it's more informative than position. As to whether or not the drawing is correct, I guess I can't say without looking at it. Does it specify "bilateral"? Position always extends the zone to all sides of nominal. There's no provision for a unilateral or unequal zone in position; at least not in ASME. If it says bilateral I'd go with surface profile and never look back. It literally controls the location of every point. Good luck. Link to comment https://qualityforum.zeiss.com/topic/25515-weird-gdt-callout/#findComment-144447 Share on other sites More sharing options...
[Cl...] Posted January 13 Author Share Posted January 13 Turns out that the geometry extracts as a torus. and does produce the correct nominal in Z which will work in true (bi-lateral) position. I've just never seen a surface like this being called out with a position tolerance. Link to comment https://qualityforum.zeiss.com/topic/25515-weird-gdt-callout/#findComment-144517 Share on other sites More sharing options...
[Ra...] Posted January 13 Share Posted January 13 Are there basics to the center point/axis of the torus on the print? Link to comment https://qualityforum.zeiss.com/topic/25515-weird-gdt-callout/#findComment-144523 Share on other sites More sharing options...
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