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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
AB
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D
C
8/1/2011 1
To use these test you simply run the slide show and use the down
arrow key to navigate. If you find any mistakes please let me know and I will fix
them and post the updated file to the www.mygdtsite.com. The part number
above reflects the current rev. Hope this helps, let me know!
Dave Hebert (Senior Level GD&T Professional)Note: these tests are not associated with ASME
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
AB
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D
C
8/1/2011 2
Yes
No
Can the datum reference to B allowextra positional tolerance to the
given Positional tolerance?
Section 5.3.2.2
ASME 1994 Y14.5M
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
AB
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D
C
8/1/2011 3
Yes
No
The specification as shown does not follow the
Standard. Datum B can not be referenced at MMC.
Can datum shift be used
here to allow more
misalignment than the given
Positional tolerance?
Section 1.3.17
ASME 1994 Y14.5M
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
AB
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D
C
8/1/2011 4
Yes
Can the datum reference to B allow more misalignment than
the given Positional tolerance?
No
Section 5.3.2.2
ASME 1994 Y14.5M
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
AB
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D
C
How do you
limit Bonus Tolerance?
8/1/2011 6
Under the FEATURE CONTROL FRAME add the words MAX BONUS TOL .005 (for .005 bonus
tolerance)Look at the sketch above and notice the added section before the datum callout. This is the
way to place a limit for the perpendicularity tolerance.
You have to work it out mathematically using the geometric tolerance and the material
condition modifiers.
After the geometric tolerance in the FEATURE CONTROL FRAME add the word MAX .005
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
AB
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D
C
8/1/2011 7
Which of the following is the formula for
FLOATING FASTERNERS?
T = H + F
H = T - F
H = F - T
T = H - F
T = H - F(see appendix B2 for technical description)
Positional Tolerance = (MMC) smallest Hole (MMC) largest Fastener
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
AB
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D
C
8/1/2011 8
The Floating fastener formula can only be
used under the following scenario?
Fasteners are same diameter + Clearance holes are same diameter + Positional tolerances
are the same.
Fasteners are same diameter + Clearance holes are MMC + Positional tolerances are the
same.
Fasteners are same diameter + Clearance holes are RFS + Positional tolerances are the same.
Fasteners are same diameter + Clearance holes are LMC + Positional tolerances are the same.
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
AB
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D
C
8/1/2011 9
Which of the following is the formula for
FIXED FASTERNERS?
H = F (T1 + T2)
F = H + T1 + T2
F + T1 = H + T2
T1 + T2 = H - F
T1 + T2 = H - F
(see appendix B2 for technical description)
Allowable positional tolerance is as follows:
Pos. Tol (1) + Pos. Tol (2) = (MMC) smallest Ho le (MMC) largest Fastener
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
AB
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D
C
8/1/2011 10
Which of the following is the formula for
FIXED FASTERNERS with added compensation
for a positional tolerance that doesnt specify a projected
tolerance zone.
H = F + T1 + T2 (1 + (2P/D))
H = F + T1 + T2 (1 / (2P/D))
H = F + T1 + T2 (1 + (4P/D))
H = F + T1 + T2 (1 - (2P/D))
H = F + T1 + T2 (1 + (2P/D))
(same as fixed fastener except for the compensation factor
attached to the Pos. Tol. of the tapped hole. This is needed due
to errors from tapped holes that are not perfectly perpendicular)
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
AB
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D
C
If only the compensation section of the formula is appliedto the following, how much more positional tolerance is
required for the tapped holes?Reference H = F + T1 + T2 (1 + (2P/D))
Depth = 4
Projection = 1
Depth = 3
Projection = 1
Depth = 1
Projection = 1
Depth = 2
Projection = 1
(1+(2*1)/4)) = 1.5X more positional tolerance required for tapped holes
(1+(2*1)/3)) = 1.67X more positional tolerance required for tapped holes
(1+(2*1)/2)) = 2X more positional tolerance required for tapped holes
(1+(2*1)/1)) = 3X more positional tolerance required for tapped holes
A
DB
C
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
AB
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D
C
It may be helpful for this exercise to think of a surface plate or flat piece of manufacturing equipmentto look similar to the jagged line shown below because at a microscopic level it probably is.
What is the theoretical Plane of a Datum Feature called?
Datum Plane its the TGC (theoretical geometric counterpart) of the datum feature
A
TheoreticalActual surface (surface plate or part)
Whats the theoretical Plane derived from the Datum Feature Simulator(surface plate) called?B What is the actual surface of a Part called (in regards to Datum's)?C Whats the actual surface of a Surface Plate (for example) called (regards to datum's)?D
Simulated Datum Plane
Datum Feat re
Simulated Datum Feat re Surface of the Surface plate or Machine Surface)
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
AB
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D
C
8/1/2011 14
Actual size
Actual local size
Actual mating size
Nominal sizeResultant condition size
Virtual condition size
Constant (no bonus)
How big/small it acts
Cross section (2d)
Variable (bonus+)Just a name
Actual Part
Match the words in the left column
to those in the right column.
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
AB
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D
C
8/1/2011 15
What is the Datum Feature
Simulator?
The axis of the of the part.
Ring Gauge
The ring gauge.
The surface of the OD of the of the part.
The surface of the ID of the ring.
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
AB
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D
C
8/1/2011 16
While inspecting a part the inspector went through the processof finding a precision ground pin that fit tightly in a drilled hole
(shown in red). Is this method called:
A - Circumscribed
B - Resultant condition methodC - Inscribed
D Virtual condition method
Inscribed the pin touches on all the high spots of the inside of the hole.
Pin
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
A
B
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D
C
8/1/2011 17
Can you use a precision ground gauge pin in this manner to
determine if a hole in a part is too large?
A - YES
B - NO
No, you cannot detect lobes (as shown above in blue) with a pin.
Pin
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
A
B
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D
C
8/1/2011 18
If you only used a gauge pin to check the spec on this hole
what information did you uncover about the hole?
Straightness of the hole.
Pin
The geometric counterpart of that feature.
The actual mating size.
Both B and C.
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
A
B
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D
C
8/1/2011 19
While inspecting a part the inspector went through the process
of finding a Ring Gauge that fit tightly around the outside
diameter of a feature (shown in red). Is this method called:
A - Circumscribed method
B - Radial measuringC - diametrical measuring
D Ring Method
Cirumscribed the Ring Gauge touches on all the high spots of the outside
of the feature (smallest circumscribed cylinder).
Ring Gauge
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A
B
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D
C
8/1/2011 20
What is the True Geometric
Counterpart in the sketch
to the right:
The axis of the of the part.
Ring Gauge
The axis of the of the ring.
OD of the of the part.
ID of the ring.
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
A
B
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D
C
8/1/2011 21
What is the True geometric counterpart in the sketch below. This
is a precision ground vice holding a part to be measured.
The mid plane of both faces of the vise jaws .
Both faces of the vise jaws.
The face of the solid jaw (jaw that doesnt move).
The face of the part that is up against the face of the solid jaw.
Datum
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
A
B
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D
C
The face of the part that is up against the face of the solid jaw.
8/1/2011 22
In this case, the vice is being used as a
______ _______ _________.
Both faces of the vise jaws.
The face of the solid jaw (jaw that doesnt move).
In this case, the vice is being used as a
Datum Feature Simulator
Datum Feature Simulator
Datum
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
A
B
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D
C
8/1/2011 23
Which center line defines the mid plane
of the true geometric counterpart of thepart shown below?
A B
The mid plane of two parallel planes (faces of the jaws here) at minimum
separation.
Datum
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
A
B
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D
C
8/1/2011 24
Which center line defines the derived
median plane of the feature?
A B
Datum
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
A
B
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D
C
8/1/2011 25
Which center line defines the center
plane of the feature?
Datum
A B
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
A
B
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D
C
8/1/2011 26
When a deep hole is drilled in a part
there is a tendency for the drill to walk.
This result of a crooked drilled hole can
be seen in the assembly on the right (in
blue). GD&T has a positional tolerance
zone shape that can deal with this. Whatis the name of the tolerance zone?
The mid plane of both faces of the vise jaws .
Both faces of the vise jaws.
The face of the solid jaw (jaw that doesnt move).
The face of the part that is up against the face of the solid jaw.
A conical tolerance zone
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GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)GD&T SELF EVALUATION TEST - DIFFICULTY LEVEL - 9 (of 10)Reference ASME Y14.5M - 1994 by David Hebert (GD&T Senior Level Certified but not associated with ASME) Test # - 1994-TL9-T01A-RevA
A
B
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D
C
8/1/2011 27
Please supply the answers to the following:
MMC of the hole = _________
LMC of the hole = __________
Possible Datum Shift = ________
Virtual Condition = __________
Resultant condition if actual hole size is 5.2 diameter = _____
Possible Bonus Tolerance = __
Is Datum Plane A a mid plane (Y/N) = __
What is the material condition for the 5mm modified at?______
5.0
5.5
1.0
0
.0
6.
Y
RFS