Flatness Callout Question
Flatness Callout Question
(OP)
Good afternoon all. I have a new print with a callout I am unfamiliar with. It is a rectangular plate with the following callout tied to the thickness

I am unfamiliar with the TOT. All I can think of is Total Over Thickness? Not really sure.

I am unfamiliar with the TOT. All I can think of is Total Over Thickness? Not really sure.
________________________________
Ryan M
Quality Engineer
3d Printer Hobbyist





RE: Flatness Callout Question
http://www.tec-ease.com/gdt-tips-view.php?q=90
The brief Tec-Ease article is...brief. It does, however, specifically say that "In the early days of GD&T, TOT was used to indicate total."
RE: Flatness Callout Question
I am wandering if by any chance drawing is produced somewhere overseas, and what standard it follows exactly?
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: Flatness Callout Question
________________________________
Ryan M
Quality Engineer
3d Printer Hobbyist
RE: Flatness Callout Question
I understood you have solved your problem, but tomorrow yourself or someone else may encounter similar "creativity"
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: Flatness Callout Question
RE: Flatness Callout Question
The only thing left now is to find reference to "total flatness" in ASME Y14.5
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: Flatness Callout Question
Appendix D (Former Practices) paragraph D6 reads:
D6 Identification of the Tolerance Zone
For a positional tolerance or symmetry tolerance, the word TOTAL following the tolerance value was used to represent the distance between two parallel planes (noncylindrical zone). For the present practice, see 3.6. For a positional tolerance, the symbol R following the tolerance value was used to represent the radius of a cylindrical zone or one-half of the distance between two parallel planes (noncylindrical zone). The radius method is no longer used.
RE: Flatness Callout Question
So, it was "former practice" back in 1982 (still not applied to flatness)
Sometimes symbolics come back, like BAS for basic in 2009, but still no sign of total flatness. Pithy
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: Flatness Callout Question
RE: Flatness Callout Question
________________________________
Ryan M
Quality Engineer
3d Printer Hobbyist