Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsA homemade electrical-discharge machining (EDM) project crossed an important threshold: it moved from producing experimental sparks to machining useful small parts. The achievement is significant, but “production” needs qualification. The project was not shown to be an industrial, certified, production-rate EDM system; it was a promising work-in-progress that demonstrated practical results from salvaged equipment, a reported 60-volt supply, and a simple pulse generator.
Hackaday’s April 30, 2021 report, by Dan Maloney, identifies the builder as Andy and describes the progression from an old tap-burning machine to a machine capable of producing useful parts from thin stock.
As an Amazon Associate I earn from qualifying purchases.
What EDM does
Electrical-discharge machining removes electrically conductive material through controlled electrical discharges between an electrode and a workpiece. It is not ordinary arcing, plasma cutting, or welding. The machine must repeatedly create and interrupt small discharges across a controlled gap while preventing the electrode from simply shorting against the part.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
A simplified EDM cycle looks like this:
- Apply voltage between the electrode and conductive workpiece.
- Move the electrode toward the work until the gap can break down electrically.
- Deliver a controlled pulse that erodes a small amount of material.
- Interrupt the pulse and clear debris from the gap.
- Advance, hold, or retract the electrode according to the electrical condition.
- Repeat the cycle many thousands of times.
The dielectric medium helps control the discharge and carry away eroded particles. The workpiece and electrode must both be electrically conductive, and the electrode’s shape influences the resulting feature. EDM can be useful for difficult materials, small holes, delicate features, and geometries that are awkward to produce with conventional cutting tools.
#1 Best Overall
- [No damage to threads] Spark erosion principle, can fast remove broken taps, drills, screws,bolts from work pieces without damage to the threads. Removing Size: M2 to M30 (5/64'' TO 1-3/16'')
- [High speed] 2000W input power;High processing speed: 1.5mm/min; Dielectric: tap water; Electrode: brass rod Φ0.8~10mm
- [Portability] Small Size, light weight; Easily process on large or heavy work pieces. Used by machine shop,,heavy equipment repair,aircraft, auto/truck repair, etc.
- [Flexibility]One Key Start/Stop; Manual Up/Down; Working head is separated from the machine and could rotate in any direction. Increases the vibration function, highly improve the processing efficiency.
- [Applicable Industry]Widely used by machine shops, heavy equipment repair, aircraft, auto/truck repair and R&D shops,nuclear or wind power industry,etc.
How the homemade machine started
The project began with an old tap-burning machine as its mechanical foundation. The early electrical setup used a reported 60-volt power supply and a simple pulse generator. The initial goal was not to create a complete CNC machining center. It was to establish whether the basic process could be controlled:
- Generate a repeatable discharge.
- Keep the electrode close enough to the workpiece for breakdown.
- Avoid continuous short circuits.
- Position the electrode mechanically.
- Remove enough material to produce a useful result.
The 60-volt figure describes this project’s reported early setup. It is not a universal EDM specification or a recommendation for reproducing the machine.
The difficult part is controlling the gap
Generating a spark is relatively easy compared with maintaining a useful machining gap. If the electrode is too far away, the discharge may not occur. If it is too close, the electrode can short against the workpiece or produce unstable arcing rather than controlled erosion.
Free tools Windows power users keep installed
One-click scans. No signup required.
That makes the electrical and mechanical systems inseparable. Voltage, current limiting, pulse duration, pulse frequency, electrode position, debris removal, and thermal conditions all affect one another. A workable homemade machine therefore needs more than a power supply and two conductive objects.
| System | Why it matters |
|---|---|
| Pulse generator | Controls when energy reaches the gap and helps prevent uncontrolled arcing. |
| Gap positioning | Advances the electrode as material is removed and retracts or stops when a short develops. |
| Mechanical rigidity | Limits vibration, backlash, and unintended changes in the discharge gap. |
| Flushing | Removes eroded particles that can destabilize the gap. |
| Thermal management | Controls heat in the workpiece, electrode, and dielectric. |
| Electrode design | Determines the feature geometry and affects wear and dimensional accuracy. |
| Workholding | Keeps the part stable and maintains a reliable electrical connection. |
The available project report does not publish a complete schematic, pulse waveform, feed algorithm, machining rate, tolerance data, surface-finish measurements, or electrode-wear results. Those missing details matter when assessing whether a machine can repeat a result rather than merely produce one successful demonstration.
Rank #2
- INTRODUCTION - WTTTOOLS broken tap remover, can fast remove M2-M48(5/64''to 1-57/64'') broken taps, broken bolts, drill bits, screws without damaging threads and workpiece. Input Voltage: 110V. Output Power: 3000W; Electrode Chuck Diameter: 2-13mm. Max Process Depth of Spindle Servo: 70mm. Max Process Depth 70mm/2.78in. Work Liquid: Tap Water. Machine Dimension: 16.5*8.7*14.6in. Net Weight:48.51lbs. Package Included: SFX-4000B Tap Burner*1, EDM Electrode Set D*1.
- HIGH EFFICIENCY - Different from traditional broken tap extractor tools and kits, this kind of tap disintegrator edm machine can save much time and and labor energy because the depth can be set and it can achieve auto retract and alarm Depth setting. And the reset button can be used for stuck spindle which can highly improving your working efficiency.
- EASY TO OPERATE - This EDM machine can be operated easily that you only need to turn on switches and adjust current and then the broken taps can be easily removed from the workpiece. Besides, the small volume and lightweight design make it easily process on large or heavy work and help improve removing efficiency without space limitations.
- PREMIUM QUALITY - With seperated workhead, the processing direction can be 360°adjusted to fit the workpiece. Adopts magnetic base and cross connector to support the workhead which provides you more stable working process. Suitable for various workpieces and machine shop, heavy equipment repair, aircraft, auto/truck repair, etc.
- CARING WARRANTY - We provide a 1-year warranty for the whole machine. If you have any questions or problems, please pm us directly via Amazon and we will try our best to make each customer satisfied.
From sparks to useful parts
The project’s most important step was its move beyond proof-of-concept behavior. Hackaday reports that later refinements allowed the machine to make useful parts from thin stock, described as being produced quickly and cleanly.
That result supports a careful interpretation of the headline. The machine had moved from experimental discharges to production-like usefulness for the builder’s own work. It does not establish documented industrial throughput, repeatability, dimensional accuracy, unattended operation, or commercial viability.
| Claim | What the evidence supports |
|---|---|
| EDM operation | The project demonstrated controlled electrical erosion rather than merely displaying a spark. |
| Useful machining | The report says useful parts were made from thin stock. |
| Production capability | “Production” is best understood as useful, production-like output for the project—not industrial production. |
| Industrial replacement | Not demonstrated; no published throughput, tolerance, safety certification, or quality data are provided. |
A broader self-sufficient workshop
The EDM machine was part of a wider maker workshop. The builder had also made a homemade injection-molding machine, and the EDM machine’s control-panel buttons were produced using that equipment.
That detail is more than a curiosity. A project like this benefits from the ability to fabricate fixtures, modify mechanical assemblies, make controls, and replace specialized parts. It helps explain how the machine could evolve through repeated mechanical and electrical experiments rather than being treated as a one-off assembly.
What this type of machine may be suited to
In general, a small electrode-based EDM system can be attractive for occasional work such as small holes in hard conductive material, broken tap or drill removal, delicate features, and toolmaking experiments. Sinker EDM uses a shaped electrode to form a matching cavity; EDM drilling uses a rod or tubular electrode for holes; wire EDM uses continuously moving wire to cut programmed contours.
Rank #3
- INTRODUCTION - WTTTOOLS broken tap remover, can fast remove M2-M30(5/64'' to 1-3/16'') broken taps, broken bolts, drill bits, screws without damaging threads and workpiece. Input Voltage: 110V. Output Power: 2000W. Electrode Chuck Diameter: 0.8-10mm. Max Process Depth of Spindle Servo: 70mm. Max Process Depth 70mm/2.78in. Work Liquid: Tap Water. Machine Dimension: 11.8*19.7*19.7in. Net Weight: 30.87lbs. Package Included: EDM-2000B Tap Burner*1, EDM Electrode Set (A1)*1
- HIGH EFFICIENCY - Different from traditional broken tap extractor tools and kits, this kind of tap disintegrator edm machine can save much time and and labor energy because the depth can be set and it can achieve auto retract and alarm Depth setting. And the reset button can be used for stuck spindle which can highly improving your working efficiency.
- EASY TO OPERATE - This EDM machine can be operated easily that you only need to turn on switches and adjust current and then the broken taps can be easily removed from the workpiece. Besides, the small volume and lightweight design make it easily process on large or heavy work and help improve removing efficiency without space limitations.
- PREMIUM QUALITY - With seperated workhead, the processing direction can be 360°adjusted to fit the workpiece. Adopts magnetic base and cross connector to support the workhead which provides you more stable working process. Suitable for various workpieces and machine shop, heavy equipment repair, aircraft, auto/truck repair, etc.
- CARING WARRANTY - We provide a 1-year warranty for the whole machine. If you have any questions or problems, please pm us directly via Amazon and we will try our best to make each customer satisfied.
The reported project should not be credited with demonstrating every one of those applications. The specific evidence concerns useful parts made from thin stock. The article does not provide a performance table or confirm CNC interpolation, wire cutting, high-aspect-ratio drilling, or production work.
Important distinctions: sinker, wire, and drilling EDM
- Sinker EDM: Uses a shaped electrode to erode a cavity or feature.
- Wire EDM: Uses moving wire and controlled workpiece travel to cut a contour through conductive material.
- EDM drilling: Uses a rod-like or tubular electrode to create holes, often with specialized flushing.
A wire EDM system is not simply a sinker EDM with a thinner electrode. Wire handling, tension, flushing, workpiece travel, and process control introduce additional engineering requirements.
What the report does not establish
The available coverage does not provide enough information to treat the machine as a validated construction plan. It does not establish:
- CNC interpolation or multi-axis machining.
- Published dimensional tolerances or surface-finish measurements.
- Machining speed, electrode wear rate, or long-duration repeatability.
- Automated filtration, dielectric chilling, or unattended operation.
- Automatic fire suppression or commercial safety certification.
- Compatibility with nonconductive materials.
- A complete bill of materials, mechanical drawings, firmware, or construction procedure.
- Total project cost.
It also does not identify the electrode material, polarity, pulse settings, dielectric fluid, or compensation strategy for electrode wear. Those are significant unanswered questions for anyone considering a reproduction.
Safety is part of the machine design
This project combines electrical energy, stored energy, sparks, moving mechanisms, conductive workpieces, and dielectric fluid. It should be treated as an engineering case study, not as a validated construction plan.
Rank #4
- No Damage to Workpieces: The EDM-2000B uses spark erosion to remove broken taps, drills, bolts, reamers, and studs without any direct contact, ensuring no external force or damage to the workpiece. Ideal for removing broken taps from aluminum and steel.
- Compact and Lightweight Design: Featuring a small size and light weight, this portable EDM drilling machine has a rotating workhead and a magnetic base, making it perfect for large or heavy equipment repairs in machinery and auto truck repair applications.
- Easy Operation: With a one-button start-stop operation, auto feed stepper motor, and current stepless adjustment, this EDM tap remover simplifies the extraction process. Suitable for both professionals and DIY enthusiasts needing a tap extractor for stripped screws or broken bolts.
- Stable and Continuous Performance: The EDM-2000B is equipped with an MCU controller and modularized functions for easy maintenance. A cooling fan ensures long working hours, making it reliable for continuous use in workshops and repair centers.
- Wide Processing Range: Capable of fast removal of broken taps and drills (conductive material) , this Portable EDM machine can handle sizes from M2-M30 (5/64'' to 1-3/16'') . Perfect for removing broken taps, drills, reamers, and bolts in various industrial settings.
Electrical and mechanical energy
Potential hazards include electric shock, burns, arc flash, unexpected movement, capacitor discharge, overheated wiring, inadequate grounding, and short-circuit currents. OSHA’s arc-flash guidance describes the potential for shock, electrocution, burns, and arc-blast injuries. Its hazardous-energy guidance addresses unexpected startup or energy release that can cause serious injury.
Any build or service procedure needs appropriate isolation, guarding, interlocks, grounding, emergency stopping, and a lockout procedure designed by someone competent in electrical and machine safety. Stored energy must be discharged and verified before service.
Dielectric fluid and fire risk
The report does not specify the dielectric used, and readers should not assume that any convenient oil, solvent, or coolant is suitable. Fluid choice affects insulation, flammability, vapor exposure, debris removal, seals, pumps, disposal, and fire risk.
OSHA’s metalworking-fluid guidance recommends consulting supplier safety information and applicable requirements for exposure, flammability, handling, and disposal. A homemade EDM system also needs suitable containment, ventilation, spill control, and fire planning.
Recommended Free Tools
Build, buy, or outsource?
The right choice depends on whether the goal is learning, occasional repair, or repeatable production.
Best Value
- INTRODUCTION - WTTTOOLS broken tap remover, can fast remove M2 to M20 (5/64'' to 25/32'') broken taps, broken bolts, drill bits, screws without damaging threads and workpiece. Input Voltage: 110V. Output Power: 800W. Electrode Chuck Diameter: 0.8-10mm; Max Process Depth of Spindle Servo: 70mm; Work Liquid: Tap Water; Short Hole Processing Speed: ≈1mm/min Electrode Φ4(Processing Material: Hardened Steel). Max Process Depth 70mm/2.78in.Machine Dimension:15*6.3*11.8in. Net Weight: 35.3lbs. Package Included: EDM-8C Machine*1, EDM Electrode Set (A1)*1.
- HIGH EFFICIENCY - Different from traditional broken tap extractor tools and kits, this kind of tap disintegrator edm machine can save much time and and labor energy because the depth can be set and it can achieve auto retract and alarm Depth setting. And the reset button can be used for stuck spindle which can highly improving your working efficiency.
- EASY TO OPERATE - This EDM machine can be operated easily that you only need to turn on switches and adjust current and then the broken taps can be easily removed from the workpiece. Besides, the small volume and lightweight design make it easily process on large or heavy workpieces and help improve removing efficiency without space limitations.
- PREMIUM QUALITY - With seperated workhead, the processing direction can be 360°adjusted to fit the workpiece. Adopts magnetic base and cross connector to support the workhead which provides you more stable working process. Suitable for various workpieces and machine shop, heavy equipment repair, aircraft, auto/truck repair, etc.
- CARING WARRANTY - We provide a 1-year warranty for the whole machine. If you have any questions or problems, please pm us directly via Amazon and we will try our best to make each customer satisfied.
| Need | Most sensible route |
|---|---|
| Learning how EDM control works | Build or adapt a machine, if electrical, mechanical, and fire risks can be managed competently. |
| Occasional broken-tap or broken-stud removal | Consider a portable EDM or outsource the work. |
| Precision profiles | Use a wire EDM job shop or supported commercial wire EDM. |
| Formed cavities | Use a sinker EDM service or industrial sinker machine. |
| Documented tolerances or regulated parts | Use a qualified job shop or industrial machine with appropriate process controls. |
| Small experimental parts | A homemade system may be worthwhile if performance requirements are modest. |
Portable commercial EDM
For comparison, Gordon Engineering lists an AGB Portable EDM package at $11,880 on the referenced vendor page. The package includes the tool, control box, pump, reservoir, hose, cable, five electrodes, stand, fluid concentrate, accessories, and manual. The price is a dated vendor listing and should be confirmed before purchase.
That type of system is aimed primarily at portable repair work such as broken-fastener removal. It is not automatically a better choice for a hobbyist whose main objective is learning or experimentation.
Industrial systems and outsourcing
Seibu America offers industrial wire EDM systems, while Kent USA lists commercial EDM equipment. Mitsubishi Electric’s EDM documentation illustrates the infrastructure found in professional systems, including machine travel, dielectric capacity, and optional fluid-chilling provisions. The cited commercial pages do not establish public list prices.
The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →For a one-off part, outsourcing is often more practical than building a machine. A job shop can be the safer and more economical option when tolerances, finish, material condition, fire controls, or documentation matter.
The real achievement
The homemade EDM project is impressive for the right reason. It did not merely prove that electricity can erode metal. It addressed the coupled problem of generating controlled pulses, positioning an electrode, avoiding shorts, and producing useful work from a workshop-built system.
At the same time, the evidence supports a measured conclusion. This was a promising functional prototype that reached useful, production-like output for its builder—not a demonstrated industrial production machine. The project shows why EDM is technically fascinating and why reproducing reliable EDM performance requires much more than a power supply and a spark gap.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
