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Transcript of 2engg stds
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ENGINEERING STANDARDS
ByPalaniyappan K.
Bangalore.
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INTRODUCTION
The idea of the designer (product) must beconveyed to the production engineer so asto enable him to manufacture it.
The shop floor engineer can be made tounderstand easily the shape, size and
production processes required tomanufacture the product only throughsketches.
The sketches, when drawn accuratelyaccording to the standards to convey all thenecessary information to enable it formanufacturing and assembly, are called
manufacturing drawing.
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Standards
As Manufacturing Drawings are used to
communicate technical information bothwithin and outside a country, for theunmistakable exchange of technicalinformation both at the national and
international levels, it becomes essentialto have a uniform drafting practice.
The standards and conventions used in
drawings are discussed in the followingslides.
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DRAWING SHEETS
The drawing sheets are standardizedand designated as
A0, A1, A2, A3 & A4
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DRAWING SHEETS
Two successive
format of a seriesof sizes areobtained by halvingalong the length ordoubling along thewidth. The areas ofthe two sizes are in
the ratio 1:2 asshown in the figure
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DRAWING SHEET LAYOUT
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TITLE BLOCK
All drawing sheets must have a title
block.The format of the title block must be
standardized.
The title block must contain the name &logo of the organization
The title block can have technical
information like unspecified tolerance,surface roughness values etc.
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TITLE BLOCK The following details are to be
mentioned in a title block:
1. Designation of the item
2. Drawing number / Group number
3. Project number / Machine number
4. Drawing scale & projection
5. Sheet number & number of sheets
6. Material
7. Drawn / Checked / Approved status
8. Revision status
9. Technical Details
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TITLE BLOCK
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DRAWING SCALE
All drawings must be drawn to scale.
The preferred scales for drawing are
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DRAWING SCALE
If any dimension is not as per scale, the
dimension text must be underlined.If a dimension is missing, or in case of
any doubt, the drawing should never be
measured.As far as possible the drawing scale for
component drawings must be 1:1
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DRAWING DETAILS
The following details are to be
mentioned in an assembly drawing. Complete sketch of the assembly with
adequate sections and views. All the partsof the assembly must be shown.
Section cutting plane lines, direction ofview & section/view names.
Overall dimensional details and other
important dimensions Two extreme positions of parts which are
moving.
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DRAWING DETAILS
Partial details of adjacent sub assemblies
Details of bought out items withspecification
Item numbers for the parts.
Bill of materials indicating part number,
designation, quantity etc.
Other necessary instructions if required inthe form of notes.
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DRAWING DETAILS
The following details are to be
mentioned in a component drawing. Complete sketch of the part with adequate
sections and views should be shown.
Section cutting plane lines, direction ofview & section/view names should bespecified.
Complete dimensional details should be
provided with tolerance wherever required. Reference surface & geometrical accuracy
details should be provided whereverrequired
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DRAWING DETAILS
Surface finish and General surface finishrequirements should be mentioned.
Heat treatment details if necessary shouldbe given in the drawing.
Other necessary instructions if required in
the form of notes can be provided in thedrawing.
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Bill of Materials
When the design of a mechanism orassembly/ subassembly of a machine hasbeen completed, a bill of materials or a partlist is made.
This list must show the drawing number,
part name, material used, blank size,standard number and quantity required inthe assembly/ subassembly.
The bill of materials must also show a list
of all standard parts, quantity required andremarks if any.
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PART LIST / BILL OF MATERIALSl No. Name Dwg No. Material Qty Size Std No. Remarks
Project No. Prepared ByProject Name Approved By LOGOAssy/ Sub-assyNo. Date
Revision
LOGO
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NUMBER REGISTERAssy / Part Dwg No. Name Used in Assy
Project No. Prepared ByProject Name Approved By LOGO
DateRevision
LOGO
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LINE TYPES
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TYPES OF LINES
A. Continuous thick: Visible outlines
(outlines to be bold & dark)B. Continuous thin: Dimension lines,
leader lines, extension lines,
construction lines, outlines of adjacentparts & hatch lines.
C. Continuous thin wavy: Irregularboundary lines, short break lines.
D. Short dashes medium: Hiddenoutline & edges.
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TYPES OF LINES
E. Long chain thin: Center lines, pitch
circles, extreme positions of movableparts.
F. Long chain thick at ends & thin
elsewhere: Cutting plane linesG. Long chain thick: To indicate
surfaces which are to receive additionaltreatment.
H. Short zigzag thin : Long break lines.
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TYPES OF LINES (Application)
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Recommended Sizes forLetters & Numerals
DRAWING CONVENSIONS
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DRAWING CONVENSIONS
DRAWING CONVENSIONS
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DRAWING CONVENSIONS
DRAWING CONVENSIONS
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DRAWING CONVENSIONS
DRAWING CONVENSIONS
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DRAWING CONVENSIONS
CENTER HOLES
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CENTER HOLES
The dimensions for center holes is asindicated in page 133 of CMTI handbook.
The representation of center holes on adrawing is as indicated in page 134 ofCMTI hand book.
RELIEF GROOVES
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RELIEF GROOVES
The standards & dimensions of reliefgrooves for different application are as
indicated in page 139 of CMTI handbook.
DIMENSIONING
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DIMENSIONING
Dimension is a numerical value
expressed in appropriate units ofmeasurement & indicated graphically ontechnical drawings with lines, symbols ¬es, so that the feature is completely
defined.
Individual drawings shall use the sameunit for all dimensions without showing
the unit symbol.
Each feature shall be dimensioned onlyonce in a drawing.
DIMENSIONING
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DIMENSIONING
Different ways of dimensioning:
Linear dimensioning Angular dimensioning
Aligned dimensioning
Ordinate dimensioning Co-ordinate dimensioning
Radius/Diameter
Leader
DIMENSIONING
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DIMENSIONING
Classification of dimensions:
Functional: A dimension that is essentialto the function of the component.
Non-functional: A dimension that is not
essential to the function of thecomponent.
Auxiliary: A dimension given for
information only. It does not governproduction or inspection. An auxiliarydimension is enclosed in brackets & notolerance applies to it.
DIMENSIONING
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DIMENSIONING
DIMENSIONING
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DIMENSIONING
DIMENSIONING
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DIMENSIONING
DIMENSIONING
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DIMENSIONING
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Thank
You