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MME2259 Design Documentation Going to Manufacture
Prepared by: Chris Vandelaar
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Going to Manufacture Design finalization Drawings: Contents – Overview
Drawings and Drawing packages Working with University Machine Services (UMS)
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What makes a design final?
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Design is finished when:
You have consensus….. Majority of stakeholders agree
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Design is finished when:
CAD models are complete Include: Fasteners, Electromechanical components: Motors, Actuators, Power supplies, Limit switches, Etc…
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Design is finished when:
Method of fastening chosen for all connections Permanent -Welded Temporary/removable - screw Tamper resistant Cost effective – weld, rivet or tape
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DFM done for all parts Can it be manufactured? Cost effectively?
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Virtual Assembly Parts – check clearances, alignments
Fasteners – include tool access Bottom up assembly?
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Fasteners Ensure maximum material conditions for threaded holes
Maximum thread engagement Proper chamfers on threaded holes prevents thread damage
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Round Table Simplification
Saw cuts instead of mill finishes Chamfers instead of arcs Rivets or welds instead of screws WARNING – expect it won’t work It may need to come apart It is a prototype…
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Review: Consensus CAD model is complete Methods of fastening DFM
Virtual Assembly Round table simplification
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Manufacturing Documents
What is the purpose of your product? Is it a prototype? Function – will your idea work? Finish – how will it look and feel? Testing new techniques – can I make it this way? Destructive – what is it’s breaking point? Final product – One off All are major factors in your products manufacture and influence cost significantly
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Manufacturing documentation
What kind of drawings do you need for prototyping? None: You’re making it yourself Sketches/Rough Drawings: – You’re working with a partner close by that you trust and know – familiar Full documentation: You don’t know who is making it?
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Sketches
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Manufacturing documentation
What kind of drawings do you need for production? Sketches/Rough Drawings: – You’re working with a partner close by that you trust and know – familiar Full documentation: You don’t know who is making it? It’s being made overseas or far away In a place where a different language is spoken Drawing standards ensure clear communication around the world
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Full drawings are time consuming
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Drawings Purpose of drawings:
Convey all information required to get what you asked for: Parts Important Estimate the cost of manufacturing the parts Equally important!
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Drawings and Drawing Packages
Assembly Drawings Sub-Assembly Drawings Part Drawings Support Documentation
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Assembly Drawings: Include
At least one view of assembly BOM List top level parts only – Sub assemblies, big ticket components Notes common detail occurring throughout the entire assembly I.e.: All fasteners to be 416 stainless steel Overall dimensions Shows space requirements Overall Mass (estimated) Shows potential shipping requirements/budget
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Sub-Assembly Drawings: Include
At least one view of the Sub Assembly BOM List all components and sub-assemblies. Including fasteners Notes Special assembly instruction or sequence information All details common throughout sub-assembly All ferrous metal parts must be demagnetized fully Overall dimensions and Mass Shows space and handling requirements
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Part Drawings: Include
Part geometry GD&T
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Part Drawings: Include
Part geometry GD&T Basic tolerances are plus / minus the dimension given Hole too small + shaft too big (all within basic tolerance) = REWORK = EXTRA COSTS!!! Tolerances matter!
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Part Drawings: Include
Part geometry GD&T Notes - specific to the part Finish I.e. All edges to be chamfered ” unless specified Surface treatment I.e. part to be chemically treated with Black Oxide coating
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Drawing example
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Support Documentation: Includes
Data Sheets – for purchased components. Available from most component manufacturers Supplier Data – Suggest potential sources for purchased components Set up documentation – for proven techniques and processes used in the manufacture of specific components or assemblies Not generally seen in prototyping ONLY GIVE PERTINENT INFORMATION NO DUPLICATION
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Presentation of drawing packages:
Order Main Assembly Drawing with BOM Main Assembly Detail Drawings Sub-Assembly Drawings Sub-Assembly Detail Drawings Individual Part Drawings belonging to the sub-assembly – repeat if needed Support Documentation
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Presentation of drawing packages:
Continued…. Ease of access to important information Folded so title block is on top Gives access to part numbers, material type, quantities, etc. Supply contact information Manufacturer/Estimator may have questions
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Working with UMS Resources Materials sourcing – common to obscure
Outsourcing support Standard component catalogue library 100+ years in prototyping and technical expertise
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What you need to Work with UMS
Help – The faculty supports UMS to help Undergraduate students gain actual industry standard experience at no cost to you An idea – UMS can provide discrete design support A problem – UMS can provide complete solutions – Not free ~$73.00/hr A full design – UMS offers in house machining and Fabricating
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What to expect as Undergraduate students
Consultation if needed Design/Drawing review Workshop training Estimating of project costs with explanation of where costs are incurred Suggested cost reducing measures Call come in or us to set a meeting
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UMS Costs Consulting = No cost to Undergraduate Students
Basic Shop Rate = $63.00/hr Technical staff Machine rates: (approximate) CNC Machining Center = $15.00/hr + operator = $70/hr - $15/hr if unattended run is possible FDM ≈ $40 / cubic inch – very approximate – always get proper quote – depends on build All other equipment is covered under basic shop rate
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Where is UMS? Thompson Engineering Building. Room 50
University of Western Ontario 1151 Richmond Street London Ontario Canada N6A 5B9 Phone (519) Fax (519)
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Resources: Resources: Interpreting Engineering Drawings 3rd edition by Jensen & Hines The Free Dictionary – Aiolos Engineering – Toronto Ontario Canada
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