notice : this presentation was given at the october 2007 “lunch n learn” at ellison technologies...
TRANSCRIPT
![Page 1: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/1.jpg)
NOTICE :
This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte.
The presentation is meant to be viewed with the narration and detailed explanation of the presenter.
Last Updated: 8/27/2014 Understanding True Position 1
![Page 2: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/2.jpg)
Part 1 : Grasping the “Basics”
Last Updated: 8/27/2014 Understanding True Position 2
![Page 3: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/3.jpg)
2.00±0.01
1.00±0.01
The PartLast Updated: 8/27/2014 Understanding True Position 3
![Page 4: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/4.jpg)
2.00±0.01
1.00±0.01
The Tolerances
1.99 2.01
0.99
1.01
Last Updated: 8/27/2014 Understanding True Position 4
![Page 5: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/5.jpg)
1.99 2.01
0.99
1.01
The Tolerance Zone
Part 1 Center
Part 2 Center
Last Updated: 8/27/2014 Understanding True Position 5
![Page 6: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/6.jpg)
1.99 2.01
0.99
1.01
The Question… Which Part is Better?
Part 1 Center
Part 2 Center
Last Updated: 8/27/2014 Understanding True Position 6
![Page 7: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/7.jpg)
0.99
1.01
Part 1 is within the tolerance zone, but…
Part 1 Center
1.99 2.01
Last Updated: 8/27/2014 Understanding True Position 7
![Page 8: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/8.jpg)
0.99
1.01
Part 2 is closer to the Nominal Center and will assemble easier than Part 1
Part 2 Center
1.99 2.01
Last Updated: 8/27/2014 Understanding True Position 8
![Page 9: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/9.jpg)
How can we set up a tolerance band that fairly and functionally judges the position of features?
Last Updated: 8/27/2014 Understanding True Position 9
![Page 10: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/10.jpg)
1.99 2.01
0.99
1.01
Part 1 Center
Part 2 Center
Use a Circle instead of a Square!Last Updated: 8/27/2014 Understanding True Position 10
![Page 11: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/11.jpg)
Definition Time!!!
The result of a True Position Characteristic is the diameter of a circle, centered on the basic dimensions from the specified datums, that contains the actual center point.
Last Updated: 8/27/2014 Understanding True Position 11
![Page 12: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/12.jpg)
Mathematically Speaking….
True Position = ΔX2 + ΔY2 * 2
ΔX = Difference from Basic X value from Actual X value
ΔY = Difference from Basic Y value from Actual Y value
Last Updated: 8/27/2014 Understanding True Position 12
![Page 13: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/13.jpg)
2.00
1.00
New Part Print w/True Position
No Tolerances
Ø 0.01 A B C
A
B
C
True Position Diametral Zone
Primary, Secondary, Tertiary Datums
Tolerance
Last Updated: 8/27/2014 Understanding True Position 13
![Page 14: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/14.jpg)
2.00
1.00
Here’s an Example Calculation
Ø 0.01 A B C
A
B
C
Last Updated: 8/27/2014 Understanding True Position 14
![Page 15: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/15.jpg)
2.00
1.00
CAN WE SHIP IT?
Ø 0.01 A B C
A
B
C
Actual Measurements:
X=2.003
Y=1.004
Last Updated: 8/27/2014 Understanding True Position 15
![Page 16: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/16.jpg)
Actual X = 2.003 Actual Y=1.004
Basic X=2.000 Basic Y=1.000
Δ X = 0.003 Δ Y = 0.004
TP = 0.0032+0.0042 * 2 or
TP = 0.009+0.016 * 2 or
TP = 0.025 * 2 or
TP = .005 * 2 so…..
Last Updated: 8/27/2014 Understanding True Position 16
![Page 17: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/17.jpg)
True Position = 0.010
Hole Center 0.005 from Nominal
0.00
5True Position Result = 0.010
0.003
0.00
4
Nominal Center at X=2, Y=1 from Basic Dimensions
Last Updated: 8/27/2014 Understanding True Position 17
![Page 18: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/18.jpg)
2.00
1.00
Ø 0.01 A B C
A
B
C
Our True Position is within the Specification….
Barely!
YES, WE CAN! Last Updated: 8/27/2014 Understanding True Position 18
![Page 19: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/19.jpg)
Let’s do this very example in Calypso and see if the math works out!
Last Updated: 8/27/2014 Understanding True Position 19
![Page 20: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/20.jpg)
Last Updated: 8/27/2014 Understanding True Position 20
![Page 21: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/21.jpg)
This is a Theoretical feature with X Y coordinates placed exactly at 2.003 and 1.004.
Last Updated: 8/27/2014 Understanding True Position 21
![Page 22: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/22.jpg)
Last Updated: 8/27/2014 Understanding True Position 22
![Page 23: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/23.jpg)
2.00
1.00
Same Print, this time a “Real” Part
Ø 0.01 A B C
A
B
C
Last Updated: 8/27/2014 Understanding True Position 23
![Page 24: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/24.jpg)
On a “Real” Part:
X= 1.9619
Y= 1.0081
Last Updated: 8/27/2014 Understanding True Position 24
![Page 25: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/25.jpg)
Actual X = 1.9619 Actual Y = 1.0081
Basic X = 2.000 Basic Y = 1.000
Δ X = -0.0381 Δ Y = 0.0081
TP = -0.03812+0.00812 * 2 or
TP = 0.0015+0.0001 * 2 or
TP = 0.0016 * 2 or
TP = .0390 * 2 so…..
Last Updated: 8/27/2014 Understanding True Position 25
![Page 26: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/26.jpg)
True Position = 0.0779
Hole Center 0.0390 from Nominal 0.0390
True Position Result = 0.0779
0.03810.00
81
Nominal Center at X=2, Y=1 from Basic Dimensions
Last Updated: 8/27/2014 Understanding True Position 26
![Page 27: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/27.jpg)
Last Updated: 8/27/2014 Understanding True Position 27
![Page 28: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/28.jpg)
Explanation Time!!!
The GD&T standard specifies that the FUNCTIONAL center be used for calculations. This means for a hole, that the Maximum Inscribed fit be used. Calypso does this automatically!
Last Updated: 8/27/2014 Understanding True Position 28
![Page 29: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/29.jpg)
Let’s see how this changes things.
Last Updated: 8/27/2014 Understanding True Position 29
![Page 30: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/30.jpg)
Last Updated: 8/27/2014 Understanding True Position 30
![Page 31: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/31.jpg)
Watch out for Outliers!
Last Updated: 8/27/2014 Understanding True Position 31
![Page 32: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/32.jpg)
Last Updated: 8/27/2014 Understanding True Position 32
![Page 33: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/33.jpg)
Now that we have that sorted out,
ONE MORE TIME!
X= 1.9504
Y= 1.0104
Last Updated: 8/27/2014 Understanding True Position 33
![Page 34: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/34.jpg)
Actual X = 1.9504 Actual Y = 1.0104
Basic X = 2.000 Basic Y = 1.000
Δ X = -0.0496 Δ Y = 0.0104
TP = -0.04962+0.01042 * 2 or
TP = 0.0025+0.0001 * 2 or
TP = 0.0026 * 2 or
TP = .0507 * 2 so…..
Last Updated: 8/27/2014 Understanding True Position 34
![Page 35: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/35.jpg)
True Position = 0.1014
Hole Center 0.0507 from Nominal 0.0507
True Position Result = 0.1014
0.04960.01
04
Nominal Center at X=2, Y=1 from Basic Dimensions
Last Updated: 8/27/2014 Understanding True Position 35
![Page 36: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/36.jpg)
Last Updated: 8/27/2014 Understanding True Position 36
![Page 37: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/37.jpg)
“So if True Position only gives me distance from center, how do I know how to make my offsets?”
ONE MORE THING…..
You might say :
Last Updated: 8/27/2014 Understanding True Position 37
![Page 38: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/38.jpg)
Turn on Additional Position Result in the Characteristic Settings Editor.
Last Updated: 8/27/2014 Understanding True Position 38
![Page 39: NOTICE : This presentation was given at the October 2007 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with](https://reader036.vdocument.in/reader036/viewer/2022070415/5697bf781a28abf838c81b30/html5/thumbnails/39.jpg)
Understanding True Position
You’ve got Questions, We have answers.
Part 1 : Grasping the “Basics”
Last Updated: 8/27/2014 Understanding True Position 39