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Published byHunter Gauntlett Modified over 9 years ago
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1 Working with the Workshop Andy Edgar
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If you can buy it from a catalogue, buy it, don’t build it. 2 US $400
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Strategies Don’t be lazy – design it yourself –that way you get what you want, or at least asked for. 3 But get the WS to check a sketch first for manufacturability. Get as much right as possible first time, but allow for mods.
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Find 10 things wrong with this job request 1.No date 2.No charge code 3.Who is Dave? Contact details (room, phone #) 4.No idea of urgency 5.Material not specified 6.Thickness not specified 7.Quantity not specified 8.Depth of 5 x 5mm recess not specified 9.They can’t easily make a 4.37mm hole 10.They can’t make a square recess with a milling machine 5
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The lathe - turning 6
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What can be done on a lathe 7 Routine Tolerance 0.1mm
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Making Holes/Threads 8 Drills – only fixed sizes –typ. 0.5 mm increments Tolerance - ~ 0.1mm
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The Vertical Mill 9 For making flat surfaces Tolerance ~ 0.1mm CNC – Numerically controlled
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Sheet metal working 10
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For a 6mm screw, the 6 mm means 1.The distance between consecutive turns 2.The diameter of the head 3.The maximum diameter of the threaded part 4.The minimum diameter of the threaded part 11
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Screws and Bolts Which of the following heads are described as, –Phillips –Knurled –Countersunk –Allen/Cap –Hex –Cheese –Posidrive 12
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Materials Common W/S materials are –Aluminium –Brass –Copper –Stainless steel (magnetic?) –Machineable plastic (acetyl) –(Polyethylene). Soft –Nylon ( bearings, gears) –PTFE (Teflon) –Perspex, Lucite, Plexiglas (PMMA). Hard, clear. 13
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“Exotic” Materials Beryllium copper, phosphor bronze (springs) Monel 500 (Cu-Ni, low therm cond., non– magnetic) Macor (machineable ceramic) Viton (elastomer, high temp O-rings) Kapton (polyimide, vacuum, insulation) 14
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Optical Windows – Glass & Acrylic 15
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Optical Windows - Silica 16
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Broad Spectral Range Windows 17
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UV windows 18
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IR Optical Window Materials 19
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Which Material? Which of these W/S metals are not “pure ( >99%) metals? –Brass, copper, aluminium Which of the W/S materials would you use for, 1.A cryostat for liquid nitrogen/helium? 2.A sample holder for cryogenics 3.A good electrical insulator for T<200˚C 4.An electrode holder for high temperatures? Which metal would you not use for vacuum? Which metal is the most expensive? 20
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Joining Materials 21
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Soldering and Brazing Soldering (200-300˚C) –Brass, copper Sn-Pb (banned) Tin-Antimony –Have to remove surface oxide first with flux Brazing (600-800˚C) –Brass, copper, steel, SS Brass brazing rod, or Ag-Cu-Sn “silver solder” Hydrogen acts to clean surfaces 22
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Welding Mainly steel, any other metal incl. Al Filler of same metal used to reinforce joint Localised electric arc melting of metal and filler. TIG – tungsten/inert gas (argon) 23
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Glues Aim for thin joints, clean surfaces first Standard 2-part resin (araldite). Soften in acetone, flame. Silicone RTV Thermosetting polymers and resins ( hot glue) 24 Superglue (cyanoacrylate) Soluble ceramics for furnaces Low vapour pressure resin (Varian) Silver-filled epoxy, silver conductive paint
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Two Examples of Clever Design 25
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“Kinematic” Bearings 26
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Translation Platform 27
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Drawings Hand drawings are fine Ruler is good for straight lines! Use grid/graph paper To scale is best Sketch, front, top, side views for clarity (conventions) Specify ID, OD, threads, material If frequent user, consider CAD ( eg SolidWorks) 28
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Acknowledgements Many diagrams and info from, “Building Scientific Apparatus” JH Moore, CC Davis, MA Coplan, SC Greer (new copy ( 4 th edition) ordered for library) 29
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30 Table of Contents 1. Mechanical design and fabrication 2. Working with glass 3. Vacuum technology 4. Optical systems 5. Charged-particle optics 6. Electronics 7. Detectors 8. Measurement and control of temperature Index.
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3d Printing - Justin 31
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3D Printing For personalised, custom-made lab equipment. Requires a 3D design- solidworks 3D printer- School of Architecture and Design.
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Solidworks The final design is sent as a.stl file to the printer. The design is printed by slicing the design into 2D digital cross sections and depositing the materials layer-by-layer. Materials used include thermoplastics eg. acrylonitrile butadiene styrene, polycarbonate, polylactic acid. A 3D Computer Aided Design (CAD) software used to create a model. The design starts with a 2D sketch and is extruded to give a 3D object.
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IR Optical Window Materials 34
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IR Optical Window Materials 35
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