Society of Manufacturing Engineers, Machining Technology Association; 2001. The dielectric fluid becomes ionized during the course of a discharge. Copyright © 2003 - 2021 - All Answers Ltd is a company registered in England and Wales. [3] Module 9 Non conventional Machining Lesson 40 Electron Beam and Laser Beam Machining n.d. [4] Hopkinson N (Neil), Hague RJM, Dickens PM. Some filter sizes are available in “cheap” alternatives from an automotive, truck, or industrial supplier but the quality is low. EDM Zap When dielectric fluids are combined, a mixture of a wider distillation range is generally the result. This dielectric fluid is often cooled in order to ease this process. the dielectric fluid necessary for machining non conducting materials in Wire EDM is kerosene. When selecting the current, one must keep in mind the depth of the cut required. This spark does not only remove material from the workpiece, but also from the electrode itself. Petroleum or Synthetic? [5] Fused Deposition Modeling | Solutions | Stratasys Direct Mfg n.d. https://www.stratasysdirect.com/solutions/fused-deposition-modeling/ (accessed April 30, 2017). In addition to possible filter system damage, it could also cause harm to your machine. As seen in the above section, an electron beam is generated in an electron beam gun.  The electron beam is not to be exposed to air molecules as upon interaction, the electrons would lose energy, thus losing their cutting ability.  To combat this, the workpiece to be machined is placed under the electron beam and is kept under vacuum.  The usual cutting diameter of the high-energy density beam is in the tune of 10 – 100 μm [3].  As seen in the below figure, the kinetic energy from the electron beam is converted to heat energy upon hitting the work material, causing the material to instantly melt via the high-power density of the beam.  Once this is done, the molten material is then expelled from the work area via the high vapor pressure. The x, y and z directions are established. But it should. The resulting material is often higher in viscosity than the initial mixture. You will achieve the best quality by using the “30 Neutral Oil”. Figure 3 below shows one of the intricate shapes (an owl) that can be produced using these tools and the EDM. Wire EDM (AP/EXC series) Colorless and odorless Good water/oil separation and stable oxidation enables little necessity of oil changes. It consists of a magnetic chuck that is clamped to the worktable and the workpiece is placed into this magnetic chuck. EDM 3001 Lite Two important factors in the EBM operation are the energy density and the power density.  These two factors are effected by the energy per pulse duration and the spot size.  The spot size is in turn regulated via the degree of focusing achieved by the electromagnetic lenses.  As one can imagine, the higher the energy density, the material removal rate would be higher, with the trade-off being that a smaller hole is generated. This is achieved by using electrical energy to generate high-energy electrons, which makes the process classified as an electro-optical-thermal process or as a thermal beam process. Figure 3- Intricate shapes can be produced. The main parameters that directly effect the EBMs machining characteristics are: As previously mentioned, the electron beam gun is used in pulse mode via introducing a negative bias to the biased grid just below the cathode cartridge.  These pulses can range from 50 μs to as long as 15 ms [3].  By definition current is the flow of electric charge (or rather electrons) per unit time, and thus the beam current is related to the number of electrons in the beam.  Beam current can usually be seen in the tune of between 200 μamp to 1 amp [3].  This parameter, along with pulse duration, increases the energy per beam pulse. To conclude, all the necessary conditions can be selected using this touch-screen programme and hence the machining process is easier to control. Just below the cathode, one can see an annular bias grid.  This grid is used to converge the electrons of the cathode into a beam.  This is achieved by introducing a negative bias to the said grid.  The newly generated beam is then gradually accelerated using the anode directly below the bias grid via the forces of attraction.  Since the biasing grid is used to generate the beam, many models tend to use the bias grid as a form of switch to generate a pulsing beam of electrons.  Having passed through the anode, the beams passed through a series of magnetic lenses and apertures to shape, converge and filter the beam to improve the quality of the beam.  Having done all of this, the electron beam soes through the final section of the electromagnetic lens and deflection coil which focus and manage the beam respectively, increasing the focus and improving the shape of the holes produced. However high breakdown voltage is required for a highly viscous fluid. 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