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Author:gly Date: 2024-09-30
Spark occurs between the workpiece and the closest points of the electrode, which may be a solid form for die sinking, a highly conductive wire for wire cutting or a small diameter rod for hole drilling. The material is removed from both the electrode and workpiece by the spark, creating an increase of the distance between the electrode and the workpiece at that point. This causes the next spark to occur at the next-closest points between the electrode and workpiece. Even though the surfaces have only very minute peaks and valleys, these very small changes of dimension allow the EDM spark to occur between the closest points.
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The “majority” of the molds are for “new plastic" Warhammer miniatures, according to the British firm’s annual financial report for 2023
Timothy Linward Our newest full time staff writer, Tim Linward is a Warhammer 40k and Horus Heresy fanatic who dabbles in TTRPGs, board games and MTG. You'll often find him delving through Games Workshop's financial reports for gaming news, combing the indie wargaming scene for cool new titles, or listening to yet more Warhammer 40k books for deep 40k lore. He's also written for PCGamesN, and 'Grimdark', his book of essays about Warhammer 40k and Games Workshop, will be published by Strange Attractor Press when it finally emerges from the warp. His controversial gaming opinion is that the Age of Sigmar double turn is objectively bad - it gives a single die roll too much influence over the game state. (He/Him)
The report does mention that Warhammer: The Old World is “soon to be released”. Given that this is a management report to investors – in which claims about the past are audited, but claims about the future are mere predictions – we’ll be cautious, and take this as a sign that GW is targeting financial year 2023-24 to launch the revamped fantasy wargame.
The CNC control system can calculate the discharge area according to the capacity available. (Source: Excetek)
GW spent a further $2.3 million (£1.8 million) on “tooling, milling, injection moulding and paint machines”. We know from GW’s 2020-21 financial report that it consolidated all its paint-making machines into a new, 10,800 square foot (1000 square metre) factory – giving us an upper estimate for how much space that machinery might fill.
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While the process of machining using EDM is governed by the laws of physics, what does differ from one EDM machine tool to the next is the generator technology and the control circuits required to accurately apply the spark. “Excetek has invested considerable resources in both the generator that creates the spark required and the control circuits that ensure it is applied in the most efficient way to the workpiece,” states Ian Holbeche, Managing Director of the exclusive UK and Eire agents for Excetek wire cut, die sinking and hole drilling EDM machines. He continues: “Excetek’s Embedded Power System uses Digital Power Management (DPM) technology extensively. Within the Stable Discharge Module it ensures any fluctuations of the incoming power supply do not affect the quality or speed of the EDM process, so any spikes or troughs are smoothed out and a stable, controlled spark is generated at the workpiece interface.”
“In terms of speed and reliability we know Excetek’s Automatic Wire Threading system, that re-feeds the wire at the point of breaking, is one of the best available and it supports unmanned running of the machine tools. However, it is still more efficient to avoid a wire break and the Real Time Sparking control provides quick response feedback that allows cutting conditions to be adjusted to improve efficiency. We know we can increase corner cutting speeds by 35 percent and still reduce the chance of wire breakage by 90 percent thanks to the levels of digital control available,” states Ian Holbeche.
It is not just corners that can be cut quicker using Excetek’s digitally controller discharge technology. With the digital signal used to detect the discharge density, the CNC control system can calculate the discharge area according to the capacity available and it applies the correct discharge energy, wire tension and water flow to improve speed and accuracy. Typically, the cutting time can be reduced by 30 to 40 percent.
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EDM machine tool specialist Excetek has focused its innovation and development on addressing energy efficiency demands. From its generators designed to work at peak effectiveness to the ability of the machines to operate for long periods unattended, overnight on lower tariff electricity, the machine tools provide ‘more miles per gallon’.
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Games Workshop spent $8.6 million (£6.7 million) on molds for Warhammer miniatures last year, according to the firm’s financial report for 2022-23. It says the “majority” are for “new plastic miniatures”, though doesn’t detail which Warhammer 40k factions or Age of Sigmar army were reinforced by this investment into injection molding tools.
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The water, or dielectric fluid, flow is important in the EDM process as the spark from the electricity between the electrode and workpiece introduces heat. The main characteristic of the dielectric fluid is that it works as an electrical insulator, until enough voltage is applied to cause it to change into an electrical conductor. The dielectric fluid deionises when the spark is turned off and the fluid returns to being an electrical insulator.
The EDM process has a reputation for creating exceptional surface finishes, and the latest Excetek Gplus range of CNC wire EDM machines enhances this even further with a standard machining surface roughness of Ra 0.3 micron and a Super Finish Circuit able to reduce this further to Ra 0.14 micron. Ian Holbeche says: “The gains here are achieved by possibly removing the need for any super-finishing operations, such as grinding, lapping or honing, to obtain the surface characteristics required for the finished part.”
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The embedded power design allows for real-time feedback of the discharge cutting status, stabilising the process, and improving cutting speeds and accuracy. It supports further performance benefits such as corner break prevention, intelligent corner control and highspeed working.
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GW’s pre-tax profits for financial year 2022-23 were $220 million. Wargamer discovered lots of juicy titbits in GW’s half-year report: like the fact that the Warhammer 40k film deal with Amazon wouldn’t be signed that financial year, or the surprisingly low numbers of Warhammer+ subscribers. The full year report for 2022-23 makes for rather more prosaic reading.
Electro-discharge machining (EDM) is an unconventional machining process that can remove, or machine, electrically conductive materials by using thermal energy (melting and partial vaporisation of the workpiece) that is generated by a series of sparks occurring between the electrode and workpiece. The EDM process is often applied to parts made from harder materials in complex shapes, where characteristics such as strength, temperature–resistance, fine surface finish, and accurate dimensions are required.
Though it’s tempting to assume that those new molds correspond to all the Warhammer 40k, Age of Sigmar, and other minis GW released in April 2022 to June 2023, the firm casts miniatures months in advance of when they go up for pre-order. Much of this expenditure will be for future releases.
Ian Holbeche concludes: “Every manufacturing business must consider the true cost of ownership for any machine tool. Excetek has set out to minimise any running costs and offers a significant gain in overall efficiency. With the initial purchase price of the machine being at least 25 percent lower than a equivalent sized machines, and exceptional levels of local application and aftersales service support, the arguments really stack up in favour of Excetek EDM technology from Warwick Machine Tools.”
Also, a small amount of the electrode and workpiece material is vaporised with each spark. This material remains in the sparking gap between the workpiece and the electrode in the form of a cloud. Often called an EDM chip, this debris is made up of the electrode and workpiece material and it must be removed from the sparking area for efficient machining. This removal is performed by flowing dielectric fluid through the sparking gap. As standard, a high-precision water chiller maintains the dielectric temperature within a +/- 0.2°C thermal band to ensure a stable cutting environment for the workpiece.
If you’re interested in learning about the injection molding practise, check out this video by hobby YouTuber Goobertown Hobbies.
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