Drawings For Manufacture - Engineering And Computer Science
Drawings for ManufactureRodney Katz
Where to Start when CreatingE iEngineeringi DDrawingsiAsk yourself . How is the part going to be made?Have standardized sizes and partsbeen used where applicable?What are the important/criticaldimensions of the part?HHowaccuratet doesdththe partt needdto be (Tolerances)?What material does the part needto be made of to satisfyy the designgrequirements (Environment,strength, cost)?Is the part optimized for themanufacturing methods to beemployed?
What to Think About when Creatinga SetS off EngineeringE ii DDrawingsi Engineering Drawings are a set of instructions to be adhered toby the manufacturerThe instructions must be as clear and concise as possibleConsider the machines, tools, materials and skill capabilities ofth manufacturingthef t i processRelationships of dimensions to one anotherViews necessary to adequately convey features of part (Thirdangle projectionprojection, section views and detailed views)Surface finishes (O-ring sealing surfaces, cosmetic finishes etc)Always consider the cost of manufacturing your part
Example 1 Specification DrawingImportant Specifications: Origin location DimensionDii ttolerancesl Entity relationships Geometric callouts Material
Example 1 Shop DrawingImportant Specifications: Origin location DimensionDii ttolerancesl Entity relationships Geometric callouts Material
Example 2Important Specifications: Origin location DimensionDii ttolerancesl Material designation Geometric calloutsDIMENSIONS ARE IN INCHESTOLERANCES:TWO PLACE DECIMAL / /- .0101”THREE PLACE DECIMAL /- .003”UNLESS OTHERWISE SPECIFIED
Example 3
Example 4
TolerancingThings to consider consider What needs to be have tolerancesand what doesn’t (Nominal Sizes)-NominalN i l SiSize (N(Nom.)) iis ththesupplied material size withoutmachiningPrecision Requiredq((number ofdecimal places).-Excessive tolerancing canbe extremely time consumingresulting in highmanufacturing costsAvoid toleranceaccumulation/stacking
Tips and Tricks Incorporate devices which will allow room for inconsistencies in manufacturingand materialsWhen possible draw parts to a 1:1 scale and print to get a real sense of sizeConsult the manufacturer before producing detailed drawingsProvide the manufacturer an assembly drawing in order to help themunderstand the integration of the partConsider the cutting tools required to machine the part in order to determine ifthe feature is viable (Milled feature width to depth ratio)
Drafting Tips Text should be large enough to be read easilyEnsure appropriate scale and location for pointer lines (arrows)Lines should be dark and legibleAvoid using pale colours in drawingsGive parts unique names and part numbersMaintain a revision system for updated packagesRelax tolerances as much as possibleAvoid the use of builtbuilt-inin cad software for calling out tap drill sizes (consulttap drill sizes chart or the manufacturer)
Common Tap and Clearance Drill SizesTapTap DrillNom Size - T.P.I.Drill # Dec EquClearance DrillTi ht/P i i ClTight/PrecisionClearanceM diMediumClClearanceLLooseClClearanceDrill #Dec EquDrill #Dec EquDrill #Dec Equ2 - 56490.073440.086430.089420.0934 - 40420.093350.110330.113320.1166 - 32350.110290.136280.140270.1448 - 32280.140200.161180.169170.17310 - 24230.154120.189100.19370.20110 - 32200 1610.161120 1890.189100 1930.19370 2010.2011/4 - 2060.2041/40.2506.5(mm)0.25517/640.2661/4 - 287/320.2181/40.2506.5(mm)0.25517/640.2665/16 - 1817/640.2655/160.3128(mm)0.31521/640.3283/8 - 1621/640.3203/80.37525/640.39013/320.4063/8 - 24R0.3393/80.37525/640.39013/320.4067/16 -143/80.3757/160.43829/640.45315/320.4697/16 - 2025/640.3907/160.43829/640.45315/320.4691/2 - 137/160.4371/20.50013(mm)0.5129/160.5631/2 - 2029/640.4531/20.50013(mm)0.5129/160.563Note: For tap drill and clearance drill sizes outlined in the table above are sufficient for most work conducted in theUvic Mech Eng Machining Facility. For critical for high stress applications consult shop supervisor before selecting atap or clearance drill.
a SfEi iD iSet of Engineering Drawings Engineering Drawings are a set of instructions to be adhered toEngineering Drawings are a set of instructions to be adhered to by the manufacturer The instructions must be as clear and concise as possible Consider the machines, tools, materials and skill capabilities of
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12.2 ENGINEERING DRAWINGS Successful bridge fabrication and construction depend on the accuracy and completeness of the engineering drawings. Two types of drawings are normally used: design drawings and shop drawings. Design drawings show the structure configuration and provide information necessary for field assembly.
An Engineering Detail Drawing contains the key points to enable the manufacture or description of a single component that defines and communicates part of a complete design to other interested parties. Detail Drawing: An Example . Detail Drawings must provide sufficient information to enable the manufacture a part. Enough orthogonal views : enough views to adequate describe the component .
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