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Examples of Precision Machine DesignME EN 7960 – Precision Machine DesignTopic 1ME EN 7960 – Precision Machine Design - Examples of Precision Machine Designs1-1Definition A precision machine device is defined as a piece of equipment withone or more moving parts whose accuracy determines the quality ofthe device Examples of precision machine devices include:– Machine Tools Milling MachinesLathesGrindersLaser CutterWaterJetsNon-traditional machines (EDM, ECM, )– Coordinate Measuring Machines– Production Equipment Presses– Mechanical watches– Etc ME EN 7960 – Precision Machine Design - Examples of Precision Machine Designs1-21
Traditional Machine Tools – Vertical MachiningCenterSource: Mazak 3 linear axes (typical)1-5 rotary axes (optional)1-30 kW spindle power (typical)0-10,000 rpm spindle speed(typical) 50,000Source: Precision Design Lab3D parts (non-symmetrical)ME EN 7960 – Precision Machine Design - Examples of Precision Machine Designs1-3Traditional Machine Tools - Lathe3D parts(rotationallysymmetric)Source: Hardinge 2 linear axes 1 rotary axis (typical)1-2 rotary axes (optional)1-15 kW spindle power (typical)0-6,000 rpm spindle speed (typical) 25,0003D parts(rotationallysymmetric) withoff-axis features(requires 2ndspindle)ME EN 7960 – Precision Machine Design - Examples of Precision Machine Designs1-42
Traditional Machine Tools – Surface GrinderSource: THKSource: Jung GmbH 2D parts (flat or profiled)3 linear axes 1 rotary axis (typical)1- 2 rotary axes (optional)5-15 kW spindle power (typical)800-4,000 rpm spindle speed (typical) 20,000ME EN 7960 – Precision Machine Design - Examples of Precision Machine Designs1-5Traditional Machine Tools – Circular GrinderSource: Studer GmbHSource: Crowder Supply3D parts (rotationally symmetric) 2 linear axes 2 rotary axes (typical)5-10 kW spindle power (typical)800-4,000 rpm spindle speed (typical) 25,000ME EN 7960 – Precision Machine Design - Examples of Precision Machine Designs1-63
New Machine Tools – Diamond Turning3D parts(rotationallysymmetric)Source: Precitech 2 linear axes (typical)1-15 kW spindle power (typical)0-7,500 rpm spindle speed(typical) 150,000Source: Savimex3D parts (asymmetric) withfast tool servo (optional)Source: PrecitechME EN 7960 – Precision Machine Design - Examples of Precision Machine Designs1-7New Machine Tools - WaterJetSource: OMAX 2 linear axes (typical) Pump power (15-40 kW) 20,0002D parts (from flat stock material)ME EN 7960 – Precision Machine Design - Examples of Precision Machine Designs1-84
New Machine Tools – Wire –Electro DischargeMachineWire supply spool2D parts from flat stockZ-axis (150 mm travel)Wire puller (0 - 250 mm/s)Wire brake (0.1 – 180 N)YaxisTank (30 l 8 gal)(300mmtravel)Dielectric fluid supplyRight wire guide (adjustable 0 – 250 mm)Source: Precision Design LabLeft wire guide (fixed) WorkpieceMachine base (granite)Source: Precision Design Lab2 linear axes (typical)4 linear rotary axes (optional)1-10 kW power supply (typical) 100,000ME EN 7960 – Precision Machine Design - Examples of Precision Machine Designs1-9New Machine Tools – Sinker Electro-DischargeMachineSource: Charmilles 2D or 3D parts (from flat stockmaterial)3 linear axes (typical)0-5 kW power supply 80,000Source: OptimationME EN 7960 – Precision Machine Design - Examples of Precision Machine Designs1-105
New Machine Tools – Electro Chemical Machining3D partsSource: Ultra Systems Ltd. 1 linear axes (typical)3 linear rotary axes (optional)1-10 kW power supply (typical) 100,0002D partsME EN 7960 – Precision Machine Design - Examples of Precision Machine Designs1-11Coordinate Measuring SystemsSource: MitutoyoME EN 7960 – Precision Machine Design - Examples of Precision Machine Designs1-126
Performance CriteriaPrecision Devices are rated according to: Manufacturing Capability– Accuracy– Resolution– Repeatability Ability to provide motion– Number of axes (complexity of machined geometry)– Speed (determines the manufacturing time)– Travel (determines the part size) Ability to provide energy required for manufacturing processes––––Spindle power (machining centers, lathe, grinder, etc.)Laser power (laser cutters)Pump pressure (WaterJet)Voltage, Current, Frequency (EDM, ECM)ME EN 7960 – Precision Machine Design - Examples of Precision Machine Designs1-13Performance Limiting Criteria Most machines create geometry by selectively removingmaterial. The amount and location of the material removed is afunction of the amount and location of the energytransmitted from the tool (machine) to the work piece. The location of the energy transmission is rarelycontrolled directly but indirectly at remote measurementpoints. As a result, the created geometry will always deviatefrom the perfect shape. The amount of this deviation can be defined as theachievable precision of both the machine and theprocess.ME EN 7960 – Precision Machine Design - Examples of Precision Machine Designs1-147
ME EN 7960 – Precision Machine Design - Examples of Precision Machine Designs 1-14 Performance Limiting Criteria Most machines create geometry by selectively
