Why should graphite electrode cost be evaluated as part of the total EDM job cost?
Evaluate graphite cost within the complete EDM job, including electrode manufacture, EDM cutting time, labor, and tool wear...
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Frequently Asked Questions
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CNC Info 101
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Why does graphite machinability involve more than just ease of cutting?
Graphite suitability depends on machining the required shape while retaining enough strength to resist chipping through handling and EDM...
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Which operating factors and electrode properties determine EDM surface finish (SF)?
EDM surface finish depends on electrode grade and condition, dielectric flushing, discharge settings, and orbital motion...
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How should I select an EDM electrode material to minimize corner wear?
Minimize corner wear with an electrode material combining high mechanical strength and temperature resistance, while recognizing wear cannot be eliminated...
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What are the four types of EDM electrode wear, and why is corner wear critical?
EDM wear includes volumetric, end, side, and corner wear, with corner erosion especially important when reproducing sharp cavity details...
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How is metal removal rate (MRR) measured and maximized when using graphite EDM electrodes?
MRR measures material volume removed per hour, with performance depending on electrode grade, workpiece material, and machining parameters...
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What are the five key factors in selecting an EDM electrode material?
Select EDM electrode material by evaluating removal rate, wear resistance, surface finish, machinability, and cost together for the actual job...
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When should I choose Wire EDM WEDM instead of ram EDM?
Choose Wire EDM WEDM for profiles a moving wire can pass through, and ram EDM for suitable blind cavities or inaccessible features...
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How does ambient temperature variation affect EDM machining tolerances?
Temperature changes expand steel and shift EDM dimensions, making temperature control necessary for close-tolerance work...
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What are the three primary types of EDM processes, and how do their applications differ?
Wire EDM WEDM cuts through-profiles, sinker EDM forms cavities, and small-hole EDM drilling produces narrow or deep holes...
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How does graphite particle size affect EDM machining performance?
Graphite particle size affects corner retention, electrode wear, surface finish, and suitability for precision finishing or roughing...
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What is overcut in EDM, and how does it affect part dimensions?
EDM overcut enlarges the cavity beyond the electrode dimensions because sparks remove material across the gap around it...
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How does EDM electrode polarity affect cutting speed and wear?
Electrode polarity affects material removal and wear according to the material pair and generator settings, so follow the machine’s recommendations...
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Why does EDM electrode wear occur, and when does it happen?
EDM sparks erode the electrode as well as the workpiece, with much of the wear occurring at the start of each discharge...
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What does dielectric fluid do in EDM, and how does it remove swarf?
Dielectric fluid controls insulation, cooling, and debris removal in EDM, with circulation carrying eroded particles toward filtration...
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What are the advantages of a pulse EDM generator over an RC system?
Pulse EDM can reduce electrode wear and increase removal rates while controlling finish, at the cost of greater circuit complexity...
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What is the difference between RC EDM and pulse EDM spark generation?
RC EDM releases stored capacitor energy, while pulse EDM uses controlled switching to manage discharge timing more directly...
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Does material hardness affect EDM machinability?
Workpiece hardness has virtually no effect on EDM burn rate, and electrically conductive hardened materials can be machined...
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What is electrical discharge machining (EDM)?
EDM removes conductive material with controlled electrical sparks across a small gap, supported by dielectric fluid and debris removal...
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What is die-sinking EDM?
Die-sinking EDM uses a shaped electrode to produce blind cavities and fine internal details that other machining methods cannot reach...
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What is the difference between G-code and M-code?
G-code directs tool motion and machining parameters, while M-code controls auxiliary machine functions such as spindle rotation and coolant...
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What is the difference between machine zero and work zero in CNC machining?
Machine zero defines the machine coordinate reference, while work zero aligns program coordinates with the selected part or fixture datum...
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What is the difference between spindle speed and cutting speed?
Spindle speed measures revolutions per minute, while cutting speed measures linear edge speed and depends on both RPM and diameter...
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What is the difference between 3-axis, 4-axis, and 5-axis CNC machining?
Three-axis CNC uses linear X, Y, and Z motion, while four-axis and five-axis machines add rotary axes...
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What is the difference between a jig and a fixture in manufacturing?
A jig holds and locates the workpiece while guiding the tool, whereas a fixture leaves tool-path control to the machine...
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How can I prevent workpiece distortion caused by excessive clamping force?
Reduce clamping distortion by directing controlled force toward solid supports and distributing contact appropriately for thin or delicate parts...
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How does the 3-2-1 locating principle constrain degrees of freedom in workholding?
The 3-2-1 principle uses six locating contacts across three reference planes, with clamps keeping the workpiece seated against those references...
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What is workholding?
Workholding securely holds a workpiece during machining through devices such as clamps, vises, chucks, and fixtures...
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What is a chuck?
A chuck securely grips a workpiece holder or workpiece in a machine tool for machining operations...
