GD&T Symbols and Guidelines Cheat Sheet...Gauge kept parallel to datum Flat datum block (Datum A)...
1
ORIENTATION FORM LOCATION PROFILE RUNOUT A A 0.03 0.03 0.03 0.03 0.03 10±0.050 10±0.05 A A 0.03 0.03 0.03 0.03 25.0 25.0 Two parallel planes 0.03 apart Two concentric circles 0.03 apart Two parallel lines 0.03 apart Two parallel planes 0.03 apart parallel to datum Two parallel planes 0.03 apart Datum A Axis Tolerance Zone at 10±0.05 10±0.05 0.03 M Cylindrical Tolerance Zone 0.03 when Part ∅ = 10.05 0.13 when Part ∅ = 9.95 Datum A Datum A 60° Datum A Datum A Two concentric cylinders 0.03 apart Two parallel planes 0.03 apart Uniform Linear Boundary About True Profile 0.03 apart Datum B Datum A Datum A Tolerance Zone Uniform Surface Boundary About True Profile 0.03 apart Datum B Part Gauge Datum axis Measured axis 0.03 Diameter Symbol is required Can also be used on flat surfaces perpendicular to the datum axis Can also be used on flat surfaces perpendicular to the datum axis A A A 0.03 0.03 A Two parallel planes 0.03 apart A Datum A Fixed axially + Rotated A Datum A Fixed axially + Rotated Datum A Fixed + Rotated A A Gauge must follow true profile. Profile is usually measured with a CMM. Gauge ID = 10.08 Cylinder Gauge ID = M + 60° Gauge Block 60° Gauge must follow true profile. Profile is usually measured with a CMM. 90° Gauge pin inserted perpendicular to datum Pin Gauge ∅ = 9.92 (9.95 - 0.03) Pin Gauge OD = M - 0.03 Part (actual) position True center Measure X and Y location and compare to the true position. This formula must be less than the ∅ True Position tolerance (Actual X - True X) 2 + (Actual Y - True Y) 2 √ Y X Actual Y True Y Actual X True X Actual Hole Position True position Tolerance Zone of Pin Gauge Actual True 60° A A A A A A A A B B A A B B A A A A A 0.03 A A B B C C M 0.03 M 0.03 Flat datum block (Datum A) Gauge kept parallel to datum Flat datum block (Datum A) Gauge kept perpendicular to datum Part Gauge 0.03 M Planar Tolerance Zone Two parallel planes 0.03 apart = 10.08 M + Gauge spacing at Virtual Condition Actual Pin Position True position Tolerance Zone of Hole Gauge Gauge Hole ∅ = Virtual Condition (Largest Pin Size [MMC] + Position Tol.) Datum A Fixed + Rotated A 1 The following is usually done with a CMM: 1. Determine Datum axis 2. Measure referenced surface 3. Determine if central axis falls in TZ The following is usually done with a CMM: 1. Determine Datum plane 2. Measure both surfaces of features 3. Determine if midpoints fall in TZ Datum A Plane A 20.0 10±0.05 A B B C C 0.03 30.0 A 0.03 M 90° Basic dimensions (not shown) are required to define the True Profile when datums are used. Basic dimensions (not shown) are required to define the True Profile when datums are used. 2X FUNCTIONAL GAUGING For an External Feature For an Internal Feature Gauge Pin ∅ = Virtual Condition (Smallest Hole Size [MMC] - Position Tol.) 1 Multiple datums may be used to specify Perpendicularity L O F L O F F (Derived Median Line and Plane) X X W U Z X V Y Z X Y W U Z X V Y Z X Y W U Z X V Y Z X Y W U Z X V Y Z X Y O F W U Z X V Y O W U Z X V Y L O F (Derived Median Points) S L O F X X S ize Z X Y L ocation W U Z X V Y O rientation F orm Distribution/ Evenness of Form Only None Straightness (Surface) Flatness (Surface) Circularity Cylindricity Parallelism Straightness (Derived Median Line w/ ) M Perpendicularity (Feature of Size w/ ) M Perpendicularity (Feature) Angularity Profile of a line True Position Concentricity Symmetry Runout Total Runout Profile of a surface True Position (Maximum Material Condition) Flatness (Derived Median Plane w/ ) M M M M M SYMBOL NAME TOLERANCE ZONE GAUGING SURFACES FEATURES OF SIZE All drawings made in first angle projection ON DRAWING Copyright © Pareto Learning LLC - All Rights Reserved - Chart designed by Andrea Barbieri <www.andreabarbieri.net> Provided by GD&T Basics - www.gdandtbasics.com The 4 Fundamental Elements of GD&T: GD&T Symbols and Guidelines Cheat Sheet For the Premium version of this chart, sign up for our GD&T Basics Fundamentals course at www.gdandtbasics.com/gdt-training
Transcript of GD&T Symbols and Guidelines Cheat Sheet...Gauge kept parallel to datum Flat datum block (Datum A)...
ORIEN
TATIO
NFO
RMLO
CATIO
NPR
OFILE
RUNO
UT
A
A
0.03
0.03
0.03
0.03
0.03
10±0.050
10±0.05
A
A
0.03
0.03
0.03
0.03
25.0
25.0
Two parallel planes0.03 apart
Two concentric circles0.03 apart
Two parallel lines0.03 apart
Two parallel planes0.03 apart
parallel to datum
Two parallel planes0.03 apart
Datum A
AxisTolerance Zone
at
10±0.05
10±0.05
0.03
M
Cylindrical Tolerance Zone0.03 when Part ∅ = 10.050.13 when Part ∅ = 9.95
Datum A
Datum A60°
Datum A
Datum A
Two concentric cylinders0.03 apart
Two parallel planes0.03 apart
Uniform Linear Boundary About True Pro�le0.03 apart
Datum B
Datum A
Datum ATolerance Zone
Uniform Surface Boundary About True Pro�le0.03 apart
Datum B
Part
Gauge
Datum axisMeasured axis
0.03
Diameter Symbol is required
Can also be used on �at surfaces perpendicular to the datum axis
Can also be used on �at surfaces perpendicular to the datum axis
A
A
A0.03
0.03
A
Two parallel planes0.03 apart
A
Datum AFixed axially+ Rotated
A
Datum AFixed axially+ Rotated
Datum AFixed + Rotated
A
A
Gauge must follow true pro�le.
Pro�le is usually measured with a CMM.
Gauge ID = 10.08
Cylinder Gauge ID = M +
60° GaugeBlock
60°
Gauge must follow true pro�le.
Pro�le is usually measured with a CMM.
90°
Gauge pininsertedperpendicular to datum
Pin Gauge ∅ = 9.92(9.95 - 0.03)
Pin Gauge OD = M −
0.03
Part (actual) position
Truecenter
Measure X and Y location and compare to the true position.
This formula must be less thanthe ∅ True Position tolerance
(Actual X - True X)2 + (Actual Y - True Y)2√Y
X
Actual YTrue Y
Actual XTrue X
ActualHole Position
True position
Tolerance Zoneof Pin Gauge
Actual True
60°
A
A
A
A
A
A
A
A
B
B
A
A
B
B
A
A
A
A
A
0.03 A
A
B
B
C
C
M
0.03 M
0.03
Flat datum block(Datum A)
Gauge kept parallel to datum
Flat datum block(Datum A)
Gauge kept perpendicular to datum
Part
Gauge
0.03 M
Planar Tolerance ZoneTwo parallel planes
0.03 apart= 10.08M +
Gauge spacingat Virtual Condition
ActualPin Position
True position
Tolerance Zoneof Hole Gauge
Gauge Hole ∅ = Virtual Condition(Largest Pin Size [MMC] + Position Tol.)
Datum AFixed + Rotated
A
1
The following is usually done with a CMM:1. Determine
Datum axis2. Measure referenced
surface3. Determine if central
axis falls in TZ
The following is usually done with a CMM:
1. DetermineDatum plane
2. Measure bothsurfaces of features
3. Determine ifmidpoints fall in TZ
Datum APlane
A
20.0
10±0.05A B
B
C
C
0.03
30.0
A
0.03 M
90°
Basic dimensions (not shown) are required to de�ne the True Pro�le when datums are used.
Basic dimensions (not shown) are required to de�ne the True Pro�le when datums are used.
2X
FUNCTIONALGAUGING
For anExternalFeature
For anInternalFeature
Gauge Pin ∅ = Virtual Condition(Smallest Hole Size [MMC] - Position Tol.)
1
Multiple datums may be used to specify Perpendicularity
L O
F
L OF
F(Derived MedianLine and Plane)
X
X W UZ X
V
Y
Z X
Y
W UZ X
V
YZ X
Y
W UZ X
V
Y
Z X
Y
W UZ X
V
Y
Z X
Y
OF
W UZ X
V
Y
O
W UZ X
V
Y
L OF(DerivedMedianPoints)
S L OF
X
X
SizeZ X
Y
Location
W UZ X
V
Y
Orientation Form
Distribution/Evenness of
Form Only
None
Straightness(Surface)
Flatness(Surface)
Circularity
Cylindricity
Parallelism
Straightness(Derived Median Line w/ )M
Perpendicularity(Feature of Size w/ )M
Perpendicularity(Feature)
Angularity
Profile of a line
True Position
Concentricity
Symmetry
Runout
Total Runout
Profile of a surface
True Position (Maximum Material Condition)
Flatness(Derived Median Plane w/ )M
M
M
M
M
SYMBOL NAME TOLERANCE ZONE GAUGING SURFACES FEATURES OF SIZE
All drawings made in �rst angle projection
ON DRAWING
Copyright © Pareto Learning LLC - All Rights Reserved - Chart designed by Andrea Barbieri <www.andreabarbieri.net>
Provided by GD&T Basics - www.gdandtbasics.com
The 4 Fundamental Elements of GD&T:
GD&T Symbols and Guidelines Cheat SheetFor the Premium version of this chart, sign up for our GD&T Basics Fundamentals course at www.gdandtbasics.com/gdt-training
