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Work Instruction No.: CQMSWI 8.3n – Product Design
and Development Drafting Manual
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Drafting Manual
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This policy and procedure is applicable to the Research and Engineering
Department of Preformed Line Products.
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The purpose of this manual is to establish uniform drafting procedures.
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Section 1: Drawing Format
1-1
1-1-1
1-1-2
1-1-3
1-1-4
1-1-5
1-1-6
1-1-7
1-1-8
1-1-9
1-1-10
1-1-11
1-1-12
1-1-13
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Sheet Sizes
Drawing Zones
Views
Section View Cutting Plane
Placement of Sections
Section Views on Separate Sheet
Section Identification Letters
Notes
Note Location
Material Note
Overmolding
Draft Angles
Multiple Components
2-1
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Section 2: Dimensioning and Tolerancing
2-1-1
2-1-2
2-1-3
2-1-4
2-1-5
2-1-6
2-1-7
2-1-8
2-1-9
2-1-10
2-1-11
2-1-12
2-1-13
2-1-14
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Dimensioning Rules
Baseline Dimensioning
Hole and Slot Dimensioning
Reference Dimensioning
Tolerance Scheme
Angle Dimensions
Typical Dimensions
Overall Dimensions
Decimal Dimensions
Tolerances
Standard Tolerance Block
Note Tolerances
Parting Lines
Datums
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Section 3: Title Blocks
3-1
3-1-1
3-1-2
3-1-3
3-1-4
3-1-5
3-1-6
3-1-7
3-1-8
3-1-9
3-1-10
3-1-11
3-1-12
3-1-13
3-1-14
3-1-15
3-1-16
3-1-17
Section 4: Revision
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Units
Do Not Scale This Print
Angle Projection Used
Tolerances Unless Noted
Q.C. Legend
Title
Drawn By
Approved By
Approved By
Part Number
Drawing Number
Scale
Sheet Number
Origin
Revision Letter
List of Gages and IDs
Gage List Description
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5-1
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QC Legends
Bubble Dimensions
QC Labels
Numbering Convention
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Section 5: QC Legend
4-1-1
4-1-2
4-1-3
4-1-4
4-1-5
4-1-6
4-1-7
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REV
REV DATE
DRWN
APVD
APVD
CHANGE NUMBER
DESCRIPTION
4-1
5-1-1
5-1-2
5-1-3
5-1-4
Section 6: Sample Drawing
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Section 7: Sources of Information
7-1
Section 8: Revisions
8-1
6-1
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1-1 Drawing Format
1-1-1 Sheet Sizes. The standard sheet sizes that will be used are:
“A” = 8-1/2” x 11” and “B” = 11” x 17”.
Older legacy drawings may be formatted to other sheet sizes. Upon revision they
should be formatted to a standard sheet size.
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1-1-2 Drawing Zones. All sheets will contain a drawing zone. The zones will be listed in
alphanumeric format. (See Fig. 1-1-2)
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(Fig 1-1-2)
1-1-3 Views. There will be three views drawn for each part. (two minimum).
For part drawings, the Isometric view will always be in the upper right hand
corner, above or beside drawing notes. The Isometric view may be scaled down to
fit. (See Fig. 1-1-3)
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(Fig. 1-1-3)
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1-1-4 Section View Cutting Plane. A section or sectional view is one obtained by
cutting away part of an object to show the shape and construction at the cutting
plane. Sectional views are not made from another sectional view, except for clarity.
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1-1-5 Placement of Sections. Sectional views are placed as closely as practicable behind
the arrows showing the direction from which the view was taken. See Fig 1-1-5.
When it is absolutely necessary to rotate a sectional view, the degree of rotation
and direction are specified beneath the view. Cutting planes of a single section of a
symmetrical part are not necessary, but when two or more sections are taken, all
sections shall be identified. Sectional views shall be in line of projection, or
otherwise identified if for some valid reason.
(Fig. 1-1-5)
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1-1-6 Section Views on Separate Sheet. Section views should appear on the same sheet
as the subassembly, assembly or detail drawing from which they are taken. When it
is necessary to draw section views on a separate sheet, views and cutting plane
indications should be suitably cross-referenced by zone designations. When a
section view appears on a sheet separated from one containing the cutting plane
indication, the view will be oriented as it would appear if directly projected from
the cutting plane and properly cross-referenced.
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1-1-7 Section Identification Letters. Section letters are always used in pairs, A-A, B-B,
C-C, etc. Should a drawing require so many sections that the single letters of the
alphabet are exhausted, further sections may be identified by the use of
combinations of different letters such as AA-AA, AB-AB, AC-AC, etc. The letters
I, O and Q are not used as section letters. Once a letter or combination of letters is
established on a released drawing, it is not reused for another section, view, or
detail on the same drawing.
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1-1-8 Notes. Use notes to clarify features that are more accurately defined by words than
by pictures and dimensions. Notes may also be used to give instructions for the
application of special treatments and/or processes or to supplement standard
symbols. Any information relating to the drawing or its use may be placed in the
notes.
1-1-9 Note Location. Notes will be located in upper right corner of first sheet.
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1-1-10 Material Note. Notes will have a generic material call out and will not specify
supplier information or trade names (Noryl). The material will be a critical feature
and will call out the material part number (when available) and will have a
reference to material certification being required. Material notes will typically be
NOTE 1. (See Fig. 1-1-10)
NOTES:
[C] 1. MATERIAL: ALUMINUM ALLOY 6061-T6 OR 6082-T6
PLP MATERIAL P/N: 00040248
(MATERIAL CERTIFICATION REQUIRED)
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(Fig. 1-1-10)
1-1-11 Over Molding. Overmold fill locations, sealing areas and other features will have a
visual [V] or a critical [C] QC symbol that is clearly defined on the drawing.
(Fig 1-1-11)
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1-1-12 Draft Angles. Drafts are to be included in the model. It may be necessary to
identify whether a dimension is a + draft or a – draft in critical areas. Drawings
should include note number 2 where applicable. (See figure 1-1-12)
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(Fig 1-1-12)
1-1-13 Multiple Components. When multiple components are made from the same basic
part print the layout should follow the layout below. Utilize one sheet if possible.
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5.00
1.00
2.50
NOTES:
1. MATERIAL: .........
(MATERIAL CERTIFICATION REQUIRED)
2. XXXX
3. SEE SHEET 2 FOR ADDITIONAL PARTS
4. SEE LAST SHEET FOR ISOMETRIC
VIEWS OF THE PART
P/N: 8080XXX1
Non-common dimensions and notes to be shown on subsequent sheets. Subsequent
sheets must include reference back to original sheet in the notes
Ø1.00
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3.00
NOTES:
1.50
1. SEE SHEET 1 FOR COMMON DIMENSIONS
AND DRAWING NOTES.
2. SEE LAST SHEET FOR ISOMETRIC VIEWS
OF THE PART.
P/N: 8080XXX2
Final sheet should show isometric views with a summary table clearly annotating the
difference in the features of the parts
PART No.
HOLE
8080XXX1
N
8080XXX2
Y
(PLP REF ONLY)
GENERIC PART NAME: PLP_STD_A6
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NOTES:
P/N: 8080XXX1
P/N: 8080XXX2
1. SEE PRECEDING SHEETS FOR DIMENSIONS
AND DRAWING NOTES
2-1 Dimensioning and Tolerancing
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(Fig 1-1-13)
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2-1-1 Dimensioning Rules.
a. Dimension, extension and leader lines shall not cross each other unless
absolutely necessary. When it is unavoidable, a dimension line is never
broken except for insertion of the dimension. An extension or leader
line shall not run through a dimension nor shall it be broken except
where it passes through or adjacent to arrowheads.
b. Sufficient dimensions shall be shown to clearly define size, shape and
position of each feature.
c. A feature shall not be located by more than one toleranced dimension in
one direction.
d. A dimension shall be enclosed in parenthesis when it is repeated on the
same drawing, specified on a subordinate document, an accumulation of
other dimensions, or shown for information purposes. This is called a
reference dimension.
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e. Dimensions are shown outside the outline of the part, unless clarity
dictates otherwise.
f. Dimensions are selected and arranged to minimize the accumulation of
tolerances between related features.
g. Each dimension shall be expressed clearly so that it can be interpreted in
only one way.
h. The drawing should define a part without specifying manufacturing
methods. Thus, only the diameter of a hole is given without indicating
whether it is to be drilled, reamed, punched, or made by any other
operation. Exception to this rule would be in the case of quality
assurance, environmental information, or manufacturing process is
essential to engineering requirements. When this occurs, it shall be
specified on the drawing or referenced to a separate document.
i. Chain dimensions should be avoided unless basic dimension are used.
j. Object lines or extension lines should not be used as dimension lines.
k. Dimensioning to hidden lines shall be avoided unless clarity dictates
otherwise.
l. Maximum and minimum limits must be such that parts will assemble
and function under all dimensional conditions that are within limits.
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2-1-2 Baseline Dimensioning. Baseline dimensioning is to be used unless features are
required to be local for part function. These dimensions will be constructed or
interpreted to be from the theoretical datum’s, not from part features, which may
vary due to part tolerance or draft. (See Fig. 2-1-2)
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(Fig 2-1-2)
2-1-3 Hole and Slot Dimensions. All hole and slot sizes are to be dimensioned and
toleranced on the view where the true shape is shown. All features and holes used
for alignment need to show dimensional locations. (See Fig. 2-1-3)
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(Fig 2-1-3)
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2-1-4 Reference Dimensioning. All reference dimensions will be shown inside
parenthesis. (See Fig. 2-1-4)(Fig 2-1-4)
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2-1-5 Tolerance Scheme. Three tolerance schemes will be utilized.
1. Symmetrical
± .XXX
2. Plus - Minus
+ .XXX
- .XXX
3. Limits
X.XXX
X.XXX
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2-1-6 Angle Dimensions. All angle dimensions will use the decimal degree method.
Example:
36.5°
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2-1-7 Typical Dimensions. Typical dimensions will be shown with how many and
capital letter “X”. (See Fig. 2-1-7)
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(Fig 2-1-7)
2-1-8 Overall Dimensions. Drawings to include overall dimensions on the face of each
axis.(See Fig. 2-1-8)
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(Fig 2-1-8)
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2-1-9 Decimal Dimensions. When a critical dimension is involved, it must have an
assigned tolerance or use block tolerance. If it is not a critical dimension two
decimal places can be used. If a dimension is under a value of 1.00, there will be no
leading zero.
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Example:
Value under 1.00 (Critical)
Value under 1.00 (Non-critical)
Critical dimension
Non-critical dimension
.875 ±.015
.88
1.250 ±.030, or 1.25 ±.03
1.25
Note: Critical dimensions should have their own tolerance. The tolerance
should not be driven by the title block tolerance.
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2-1-10 Tolerances. Tolerance and dimension decimal places must match each other.
Example:
5.00 ± .10
5.000 ± .025
Note: Every dimension should have a tolerance unless it is identified as a
reference dimension.
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2-1-11 Standard Tolerance Block. Block will be located in the title block.
(See Fig. 3-1-15)
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2-1-12 Note Tolerances. Tolerances must be included for notes such as Hardness, Coating
Thickness, etc. A minimum or maximum figure is allowable. Also, general
tolerances for items such as castings, etc. may be called out.
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Example:
Hardness to Rockwell C (25 min., 34 max.)
or
Rc 25-34
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2-1-13 Parting Lines. Parting lines are optional. If parting lines are used they must be
clearly defined on the face of the drawing. The lines should be a heavier weight
then the object line.
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2-1-14 Datums. When using a datum you must use geometric tolerancing. The only two
that we will be using are flatness and perpendicularity.
Example:
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3-1 Title Blocks (See Fig 3-1-15)
3-1-1 Units (1). The default unit of measure will be INCH. Metric units will be displayed
in millimeters [mm]. Dual dimensioning will be denoted as INCH / [mm].
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3-1-2 Do not scale this print (2). This is to ensure that no one scales a print that is not on
its appropriate size drawing.
3-1-3
Angle Projection Used (3): Third Angle by default for PLP engineering drawings.
3-1-4 Tolerances Unless Noted (4): Also referred to as block tolerance.
3-1-5 Q.C. Legends (5). Critical and visual inspection dimensions are to be indicated.
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3-1-6 Title (6). The drawing title should be brief and distinguishable between similar
items. All top level assembly drawings will be named by Marketing and all other
drawings will be named by the Engineer and/or the designer. Part description will
come first, followed by part usage.
3-1-7 Drawn By (7). Initials of person who has made the drawing.
3-1-8 Approved By (8). Initials of the engineer prior to release. It is the Engineer’s
responsibility to ensure the drawings are accurate.
3-1-9 Approved By (9). Initials of the Engineer Manager prior to release.
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3-1-10 Part Number (10). The Specifications Group will assign all part numbers.
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3-1-11 Drawing Number (11). The Specifications Group will assign all drawing numbers.
The drawing number will be numeric only. (Example: 1267)
3-1-12 Scale (12). The scale of the drawing may be annotated in this section. Drawing
scale is only accurate when printed actual size.
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3-1-13 Sheet Number (13). This shows how many sheets there are to a drawing. There
will always be a value in this section even if there is only one page.
Example: (1 of 1)
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3-1-14 Origin (14). The number that originated the request (NPR-10xxxxx).
3-1-15 Revision letter (15). The corresponding revision letter must match the latest
revision. Capital letters to be used. Letters “O”, “I” and “Q” shall not be used.
3-1-16 List of Gages and IDs (23). This list displays common measurement instruments
used for PLP’s products.
3-1-17 Gage List Description (24). This text describes the use of the list of gages and IDs.
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(Fig 3-1-15)
4-1 Revisions (See Fig 3-1-15)
4-1-1 REV (16) Capital letters, Documents up to three revision histories in ascending
alphabetical order. When a revision gets to the letter Z, the sequence that will be
used is AA through AZ, then BA through BZ, etc. Latest revision must match the
title block revision.
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4-1-2 REV DATE (17) Date when the revised drawing is complete.
Date format to be day.month.year (dd.mm.yyyy). (REV DATE is for archival
reference only. Effective date of the revision is the release date of the engineering
part revision.)
4-1-3 DRWN (18) Initials of person making the revision change.
4-1-4 APVD (19): Initials of Engineer approving the revision change.
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4-1-5 APVD (20): Initials of Engineering Manager approving the revision change.
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4-1-6 CHANGE NUMBER (21) Change Request or NPR that initiated the change.
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4-1-7 DESCRIPTION (22) Describes the changes made and the appropriate zone
(location) of the changes.
5-1 QC Legends
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5-1-1 QC Legends. Critical [C] and Visual [V] features are inspection features for QC.
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5-1-2 Bubble Dimensions. Dimensions that reflect what the part is measuring vs. what
the part should be. A bubble dimension allows QC to accept the measured
dimension until the tool is corrected. It shows the current allowable dimension, as
well as what the dimension should be when the tool is fixed.
(Fig 5-1-2)
5-1-3 QC Labels: Critical [C] and Visual [V] features are those that are to be inspected
routinely by QC. Critical features are those which can be measured, and for which
base dimensions and tolerance limits are specified. Visual features are those which
cannot be measured.
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In the case of flexible materials, or materials which become flexible when very thin
(plastics, rubbers, etc.), features such as flash, parting line mismatch, and gate
vestiges should be identified as Visual [V] when the allowable limit is less than or
equal to .010” [0,25mm], and as critical when the allowable limit is greater than
.010” [0,25mm].
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The label block denotes, at minimum, whether the feature is Critical [C] or Visual
[V] and the gaging assignment for critical features not located in the notes. The [C]
or [V] denotation will appear in the upper left quadrant of the label block, left side
of the label block, or will constitute the entire contents of the block. The label
block may also denote the feature identification number (in the lower left of the
label block), the number of features to be measured (in the upper right quadrant or
right half of the label block) in the case of typical features, and the gaging
assignment (in the lower right of the label block) in the case of critical features not
located in the notes. The gaging assignment letters are to be specified by either
engineering or quality.
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5-1-4 Numbering Convention: All dimensions that are indicated as Critical or Visual
features will be numbered on the drawing. It is suggested that numbering start with
the left most Critical feature and move around the drawing clockwise until all
Critical features are numbered. Continue to number in the same fashion, starting
with the left most visual call-out, and move around the drawing clockwise.
For Critical or Visual features with multiple locations, the dimension will be
numbered once. A print with multiple layout sheets shall start numbering on the
first inspection sheet and continue onto the subsequent sheets following the
standard conventions outlined above. Prints containing multiple parts on a single
drawing, indicated by multiple QC legends, may be repeated for each individual
part.
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6-1 Sample Drawing
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7-1 Sources of Information:
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PLP Drafting Committee
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Giesecke, Mitchell, Spencer, Hill, Loving, Dygdon. Engineering Graphics, Fourth
Edition 1987
Lieblich. Drawing Requirements Manual, Ninth Edition 1995
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8-1 Revisions
Revision
Date
Reformatted cover page and changed drawing on page 17 to
denote change in Bubble dimension from ‘New Tool’ ‘Current
Tool’ to “New Part,” “Current Part.”
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Comments
2
9/9/05
5/22/2015
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Major changes throughout to make document reflect
current procedures done on drawings
Sect 1-1-1: Updated sheet size references
Sect 1-1-3: Updated figure image
Sect 1-1-5: Updated figure image
Sect 1-1-10: Updated Material Note requirements
Sect 1-1-10: Update figure image
Sect 1-1-11: Update figure image
Sect 1-1-12: Update figure image
Sect 2-1-2: Update figure image
Sect 2-1-3: Update figure image
Sect 2-1-4: Update figure image
Sect 2-1-5: Updated Tolerance Scheme notation
Sect 2-1-6: Update figure image
Sect 2-1-7: Update figure image
Sect 2-1-8: Update figure image
Sect 2-1-9: Updated Critical Examples with Tolerance
Sect 2-1-11: Removed figure, added new figure reference
Sect 3-1: Updated all sections and figure based on current
title block being used.
Sect 4-1: Updated all sections and figure reference based
on current revision block being used.
Sect 5-1-2: Update figure image
Sect 5-1-3: Added new section for QC Labels
Sect 6-1: Update figure image
Transferred from 2008 to 2015 ISO 9001 Standard.
Document header changed
Changes made as a result of adding gaging assignments
to drawings.
Sect 3-1: Updated figure image
Sect 3-1-16: Added List of Gages and IDs
Sect 3-1-17: Added Gage List Description
Sect 5-1-2: Updated figure image
Sect 5-1-3: Added gaging assignment descriptions and
updated figure image
Sect 5-1-4: Added Numbering Convention
Sect 6-1: Updated figure image
Updated cover page PLP brand logo
Sect 1-1-11 Updated image display
Sect 2-1-9: updated Critical dimensions to show 2 and 3
decimal places
Sect 3-1-15 Updated title block image with new PLP logo
Sect 6-1 Updated Sample drawing with new PLP logo
Approval
10/18/2017
9/24/2018
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B
10/21/2022
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