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Transcript of Geometric Tolerancing - pmpa.org · PDF fileGriffith Training On-Site Tailored GD&T Training:...
![Page 1: Geometric Tolerancing - pmpa.org · PDF fileGriffith Training On-Site Tailored GD&T Training: – Basic – Intermediate – Advanced Tolerance Stackup Analysis Functional Gage Design](https://reader036.fdocuments.in/reader036/viewer/2022081801/5aa9382d7f8b9a6c188c89ed/html5/thumbnails/1.jpg)
Geometric Tolerancing PMPA Technical Conference
Developing Today’s Talent
For Tomorrow’s $uccess
Corona, California
April 15, 2013
Gary K. Griffith
Session 1
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Gary K. Griffith
Technical Book Author Quality
Engineering
Shop Technical
42 Years Exp. Automotive
Aerospace
Engineering
Manufacturing
Quality
Photos Reference: Geometric Tolerancing
Applications and Inspection (Prentice Hall)
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Outline – Session 1
Limitations are:
1. Inspector’s Knowledge / Skills
2. Available Inspection Equipment
Form Tolerances
Flatness
Straightness
Circularity
Cylindricity
Orientation Tolerances
Parallelism
Perpendicularity
Angularity
“Form & Orientation Tolerances”
Interpretation & Inspection
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T.I.R. – F.I.M.
Some Geometric Tolerance measurements are:
T.I.R. – Total Indicator Reading
F.I.M. – Full Indicator Movement
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Flatness Tolerance
Flatness
Flatness measurement is a T.I.R. (or F.I.M.) that is
achieved with a probe or dial indicator
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Flatness Tolerance
Leveling (“Wobble”) Plate Method
Jack Screws Method
Surface must be leveled (optimum plane) so that the
probe sees only hills and valleys of flatness error
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Flatness Tolerance
“Indian” Pins Set
Alternative is “Indian” Pins. Three pins at exactly the
same height within millionths. The pins level the surface.
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Straightness of Surface Elements
Applies to individual line elements at the surface, not
the axis.
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Straightness of Surface Elements
Setup with two jack screws, a parallel, and a V-Block.
Jacks are used to level the line element, then a top-
dead-center T.I.R.
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Straightness of Surface Elements
Alternative is two equal height gage block stacks, then a bottom-
dead-center T.I.R.
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Straightness of an Axis - RFS
Challenging inspection. Differential measurements
are required for inspection. Two opposing indicators to track
axial deviation
This part is acceptable
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Straightness of an Axis - MMC
This type of straightness could be evaluated with a
Functional Gage (as with any tolerance at MMC)
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Circularity (Roundness)
Roundness tolerance zone is two concentric circles.
Roundness is a radial measurement, not diametral.
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Precision Spindle
Circularity (Roundness)
A precision spindle (or CMM) could be used.
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Cylindricity
Cylindricity combines measurement of roundness,
straightness of surface elements, and taper per side.
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Parallelism of a Surface
Parallelism of a Surface
Tolerance Zone
Parallelism measurement is a T.I.R. once the datum
has been mounted.
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Parallelism of a Surface
Parallelism Inspection
Dial indicator is being traversed across the entire
surface. The resulting T.I.R. shall not exceed the
tolerance. Flatness is automatically controlled.
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Perpendicularity of a Surface
Perpendicularity of a Surface
Tolerance Zone
Perpendicularity measurement is also a T.I.R.
Flatness is inherently controlled.
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Perpendicularity of a Surface
Inspection
Since there is only one datum, the part must be best-fit
for secondary alignment.
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Perpendicularity of a Surface
(Secondary Datum)
Perpendicularity of a Surface
Inspection
When there is a secondary datum, the part is aligned.
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Angularity
xx
Angularity Requirement
Tolerance Zone
Angularity measurement is also a T.I.R.
Flatness is inherently controlled.
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Angularity
xx
Angularity Requirement
Inspection
A Sine Bar, Sine Plate, or CMM could be used.
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Griffith Training
On-Site Tailored GD&T Training: – Basic
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Tolerance Stackup Analysis
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Inspection
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Consulting:
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Reviews
Tolerance Stackups
Functional Gage Designs
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