GD&T in the tolerance block
GD&T in the tolerance block
(OP)
The Design Group at my current company is using GD&T in the block tolerance. Not the normal plus minus tolerance but a statement that all dimensions are basic and uses a profile tolerance for all dimension tolerances. I have never seen this in past companies. Is this a generally accepted practice?





RE: GD&T in the tolerance block
http://www.tec-ease.com/gdt-tips-view.php?q=118
RE: GD&T in the tolerance block
RE: GD&T in the tolerance block
RE: GD&T in the tolerance block
Perhaps you should post an image of the title block so that we can see exactly what you are dealing with.
It's perfectly legal to use a general surface profile. As for how common it is, it is growing in popularity as it provides a full and complete product definition. As we move toward cad-model based manufacturing and metrology, you will see it even more.
Jim Sykes, P.Eng, GDTP-S
Profile Services www.profileservices.ca
TecEase, Inc. www.tec-ease.com
RE: GD&T in the tolerance block
RE: GD&T in the tolerance block
Where is the problem?
RE: GD&T in the tolerance block
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
http://www.gdtseminars.com
RE: GD&T in the tolerance block
Of course, if the datum structure is developed from the bottom surface and two sides (not really from the part function) it might be valid.
I remember one company that was forced by the automotive customer to place a default profile of a surface tolerance of 0.5 mm but I also noted the same tolerance in a FCF on one surface. When I asked why they separated one profile of a surface with the same tolerance on the particular surface, I was told that all the other default surfaces were meaningless but this particular surface had importance to the parts "function and relationship" and they wanted the shop floor to be aware of it. This was a high volume die cast shop so they would end up placing ongoing quality control on the one surface that had functional importance.
Just some thoughts from a different perspective.
Dave D.
www.qmsi.ca
RE: GD&T in the tolerance block
"Wildfires are dangerous, hard to control, and economically catastrophic."
Ben Loosli
RE: GD&T in the tolerance block
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
http://www.gdtseminars.com
RE: GD&T in the tolerance block
Jim Sykes, P.Eng, GDTP-S
Profile Services www.profileservices.ca
TecEase, Inc. www.tec-ease.com
RE: GD&T in the tolerance block
Matt Lorono, CSWP
Product Definition Specialist, DS SolidWorks Corp
Personal sites:
Lorono's SolidWorks Resources & SolidWorks Legion