profile tolerance
profile tolerance
(OP)
Simple question.
In the image does the highlighed GDT frame have any control over the basic dim 30 deg.
https://acrobat.com/#d=KaAqckInDvM4vjHFFXpbGg

Does it mean the anglar surface can offset 0.3 ?
In the image does the highlighed GDT frame have any control over the basic dim 30 deg.
https://acrobat.com/#d=KaAqckInDvM4vjHFFXpbGg
Does it mean the anglar surface can offset 0.3 ?





RE: profile tolerance
If the profile tolerance points to a surface that is at 30 degrees to a datum, and that datum is mentioned in the feature control frame, then the answer would be yes
John-Paul Belanger
Certified Sr. GD&T Professional
http://www.gdtseminars.com
RE: profile tolerance
John-Paul Belanger
Certified Sr. GD&T Professional
http://www.gdtseminars.com
RE: profile tolerance
RE: profile tolerance
Like the drawing too. What program was used to create it if you don't mind? Thanks
Dave D.
www.qmsi.ca
RE: profile tolerance
This isnt my drawing, i downloaded from on of the posts here.
I am trying to learn interpret this dwg.
RE: profile tolerance
The profile tolerance indirectly controls the orientation of the surface, by confining it to a zone that is at the 30 degree basic angle. The 30 degree angle doesn't have a direct tolerance associated with it.
Dave,
The drawing is from one of Don Day's tips of the month on the Tec-Ease site. Jim Sykes would know what Don uses.
Evan Janeshewski
Axymetrix Quality Engineering Inc.
www.axymetrix.ca
RE: profile tolerance
The angle is controlled by a total width zone between two parallel planes that are 0.3mm apart perfectly located and oriented to the DRF by the BASIC dimensions.
+/- cake shaped zones for angles is something to avoid.
Norm Crawford
GDTP-S
Applied Geometrics, Inc.
www.GDandT.com
RE: profile tolerance
Thanks for explaining. I understand you point about avoiding the cake shaped tolerance zone.
Talking more about the value, in the feature control, 0.3 is actually split on either sides of the 30 deg plane.
That is + or - 0.15
Am I correct in saying so?
RE: profile tolerance
Unequal and unilateral can be specified for profile also.
Norm Crawford
GDTP-S
Applied Geometrics, Inc.
www.GDandT.com
RE: profile tolerance
Incase I dont want to dimension the basic 30 (In the image, its shown below the basic 10). Alternatively, Is it good practice to add 2 new dims instead.
1. major slope to datum A
&
2. Minor slope to datum A
Which one of it is consider a better practice?
RE: profile tolerance
But to be clear, there is nothing wrong with the way it is already shown.
Norm Crawford
GDTP-S
Applied Geometrics, Inc.
www.GDandT.com
RE: profile tolerance
(bite-cake)
Frank
RE: profile tolerance
I use the term "wedge-shaped", but cake is good too. The problem with +/- tolerances is that they usually don't tell you where to measure from ... inflection at the top or bottom or somewhere in between ... it makes a huge difference on the tolerance zone which is VERY tight (i.e. perfect) at the inflection point and grows as you move away from that point. When someone tells me that's what they want I ask them to explain to me why the surface is more important at that one point than it is farther away. The exceptions that I've encountered are optics & acoustics which both physically and mathematically use +/- degrees.
Jim Sykes, P.Eng, GDTP-S
Profile Services www.profileservices.ca
TecEase, Inc. www.tec-ease.com
RE: profile tolerance
Jim Sykes, P.Eng, GDTP-S
Profile Services www.profileservices.ca
TecEase, Inc. www.tec-ease.com
RE: profile tolerance
Then try to reproduce quality tooling when the tools wear out.
Norm Crawford
GDTP-S
Applied Geometrics, Inc.
www.GDandT.com
RE: profile tolerance
Jim Sykes, P.Eng, GDTP-S
Profile Services www.profileservices.ca
TecEase, Inc. www.tec-ease.com
RE: profile tolerance
Many cakes are more like a loaf, so a slice wouldn't' be a wedge.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: profile tolerance
Jim Sykes, P.Eng, GDTP-S
Profile Services www.profileservices.ca
TecEase, Inc. www.tec-ease.com