datum target dimensions
datum target dimensions
(OP)
ASME Y14.5, 4.6.2 datum target dimensions "the location .., where applicable, of datum targets are defined with either BASIC or TOLERANCED dimensions. if defined with basic dimension, established tooling or gaging tolerances apply..."
1) what are tooling and gaging tolerances?
2) if defined NOT basic and "not" toleranced, the UOS block linear tolerance applies?
thanks.
1) what are tooling and gaging tolerances?
2) if defined NOT basic and "not" toleranced, the UOS block linear tolerance applies?
thanks.





RE: datum target dimensions
Sometimes you'll hear about a 10% rule of thumb, but that still leaves the question of what to take 10% of...
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: datum target dimensions
thanks.
RE: datum target dimensions
Peter Stockhausen
Senior Design Analyst (Checker)
Infotech Aerospace Services
www.infotechpr.net
RE: datum target dimensions
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: datum target dimensions
18.24, two decimals, the block says +/-.03, use 10%, +/.003?
weird Y14.5 !?
RE: datum target dimensions
If the tolerance is ±.03,
The whole product tolerance range is .06
10% gage tolerance is .006
But, you need to divide the full gage tolerance in half to find the gage member tolerance.
This is the right way to calculate the gage tolerance, for example:
Hole size Ø.375+.006-.000
.006 X 10% = .0006
.0006 /2 = .0003
GO = .375 + .0003
NO-GO = .381 - .0003
The link below is a good source to understand datum target.
http://www.tec-ease.com/gdt-tips-view.php?q=133
SeasonLee