¶ How long does it take to cut materials with a 20W fiber laser?
¶ 1. Metal Cutting Time Reference
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| 1mm Stainless Steel | 1mm Brass | 1mm Aluminum |
| 4 hours | 1 hour | 1 hour |
¶ 2. Key Factors That Affect Laser Cutting
Even within this very thin range, laser cutting performance is heavily influenced by the following factors:
- Laser Cutting speed: The slower the speed, the more energy accumulates, making it more likely to cut through. However, productivity drops and the heat-affected zone becomes larger.
- Material surface condition: Polished stainless steel sheets have high reflectivity, which causes some laser energy to be lost. Matte or coated surfaces absorb the laser more easily.
¶ 3. Important Warnings and Comparisons
- Not recommended for cutting: A 20W laser engraver is not recommended for cutting metal. Its primary purpose is precision engraving on non-metal materials (such as acrylic and leather), as well as marking and engraving on metal surfaces.
- Power comparison: In industrial applications, stainless steel cutting typically starts at 500W.
- 500W–1000W: Capable of cutting 1-3mm stainless steel stably.
- 1000W–3000W: The mainstream power range for cutting 1–10 mm stainless steel.
- 6000W and above: Used for cutting stainless steel from 12 mm to 20 mm or even thicker.
¶ Recommendation
If your work mainly involves ultra-thin stainless steel foil under 0.3 mm and edge quality is not a high priority, the Dual 2 can handle the job with careful tuning—but be prepared for low efficiency and less-than-ideal results. Choose the equipment power based on your primary material type and thickness requirements to avoid being unable to complete the job due to insufficient power.
¶ How deep can a 20W fiber laser engrave?
¶ 1. Depth Range
Surface marking/oxidation blackening (nanometer scale – 0.01 mm):
- Process: The laser oxidizes a thin layer on the metal surface, creating a color contrast (usually black).
- Characteristics: Almost no change to surface flatness, fast, and the most commonly used method. This is not true "deep engraving"—it is "marking."
Light-depth engraving (0.02 mm – 0.1 mm):
- Process: Slight material removal through a single pass or a few scans.
- Characteristics: Produces a recess that is both visible and tactile. Commonly used for logos, serial numbers, etc. This is the depth range a 20W machine handles well, with good efficiency and results.
Medium-depth engraving (0.1 mm – 0.3 mm):
- Process: Requires fast, high-power, repeated scans. The pattern area may need to be engraved hundreds or even thousands of times.
- Characteristics: This is the upper limit of "deep engraving" achievable with a 30W fiber laser. Engraving time grows exponentially—a pattern of just a few square centimeters may take tens of minutes. Edges will show noticeable carbonization and dross due to heat buildup.
Extreme attempts (≥ 0.3 mm):
- Process: Extremely slow parameters with thousands of repetitions.
- Characteristics: Neither recommended nor practical. Depth gains are minimal while time consumption is enormous, the heat-affected zone is huge, and the engraved area becomes rough and blackened—it may even cause the coin to deform from uneven heating. Both cost-effectiveness and results are very poor.
| Material | Brass Coin | Zinc Alloy Coin | Slate |
| Result |
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| Depth | 0.53 mm | 0.17 mm | 3 mm |
¶ 2. Key Factors That Affect Engraving Depth
1. Engraving method (most critical):
- Fill engraving: This is the main way to produce depth. Material is removed layer by layer by setting line spacing and the number of scans. The more passes, the greater the depth—and the longer the time.
2. Laser parameters:
- Power: Set to 100% (20W) or use high peak-power mode.
- Fill line spacing: The smaller the value (e.g., 0.01 mm), the more overlap and the more uniform the depth, but the longer it takes.
3. Material properties:
- Type of stainless steel: 304 stainless steel is relatively easy to engrave. High-hardness or highly corrosion-resistant grades (such as hardened 440C stainless steel) are more difficult.
Coin surface: Whether it is plated, mirror-polished, or has a flat surface all affect laser absorption and the final result.
¶ 3. Important Notes and Recommendations
- Time cost: The biggest trade-off when pursuing deep engraving is time. Doubling the depth can take several times longer.
- Surface quality: After deep engraving, the bottom and sidewalls will be very rough and frosted-looking, and will appear black due to oxidation. If a polished bottom is needed, post-processing such as polishing is required.
- Heat effects: Prolonged localized heating may cause deformation or discoloration on the back of the coin.
- Safety: Deep engraving generates more metal vapor and particulates. Make sure the equipment has a good fume extraction and dust removal system, and avoid looking directly at reflections.
¶ Summary and Comparison
- The core strengths of a 20W fiber laser marking machine are "fine marking" and "shallow engraving." It is an excellent tool for clear text, fine patterns, and serial numbers on coins.
- If your main goal is significant relief depth (for example, deeper than 0.5 mm), a 20W machine is not the right choice. You should consider: a higher-power model such as the Dual 2 / mopa60 (e.g., 30W or 60W), which delivers a multifold increase in efficiency.
- A professional CNC engraving machine (mechanical milling), which is the standard industrial method for clean, precise depth.
- Chemical etching or stamping processes.
Recommendation: If you already own a 20W machine, start by testing on a piece of stainless steel scrap. Begin with a small number of scans, gradually increase, and record the depth and time of each test to find the optimal parameter combination that meets your needs within an acceptable timeframe.
¶ How fine a pattern can the em-smart Basic handle?
Its core working mode is "division of labor." The specific task allocation and achievable precision are summarized below:
| Material | Recommended Laser | Key Precision Indicator (Theoretical) | Core Features and Notes |
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| Metal materials (Stainless steel, aluminum, copper, etc.) |
Fiber laser (1064nm) | Minimum line width: 0.065 – 0.12 mm | This is where fiber lasers excel. Capable of producing permanent black or light-colored marks—ideal for fine text, serial numbers, and complex logos. |
| Dark / coated metals (e.g., black marking on anodized aluminum) |
Fiber laser (1064nm) | Minimum line width: as fine as ~0.065 mm | Optimized for high-contrast marks on dark coatings, though the ultimate precision is slightly lower than on polished metals. |
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| Aluminum Plate | Black Acrylic |
¶ Key Factors That Affect Precision
Whether the theoretical specifications above can be achieved depends on the following key factors:
1. Core equipment parameters:
- F-theta lens focal length: A short-focal-length F150 lens produces a smaller focused spot, enabling finer lines.
- Beam quality: The closer the beam quality factor (M²) is to 1, the better the spot quality. This is the foundation for fine marking.
2. Material properties: This is the biggest variable in determining the final result. For example, on the same metal, a polished surface and a matte-treated surface yield completely different marking precision and contrast.
3. Parameters and operation:
- Precision-priority parameter settings: Slow down the marking speed, turn off filling, and use an appropriate frequency.
¶ Recommendation
Before purchasing or using the machine, we strongly recommend providing your supplier with samples of the materials you most frequently process for a real test run. This is the only reliable way to evaluate whether the equipment can meet your expected precision. If you can share the specific materials you want to work on and the type of patterns to be processed (such as QR code size, minimum font size, etc.), feel free to visit our website and contact customer service for a sample test.
¶ What is the maximum work area of the Mopa 20?
The em-smart Basic can engrave graphic files up to 110×110 mm.
¶ Possible Issues:
This is the most direct limitation. Any workpiece larger than 110 mm (or any area that needs to be positioned at a specific location) cannot be processed in one go. It must be divided into sections, repositioned, and re-aligned, which introduces stitching errors and seriously affects yield and efficiency.
Small-Batch Production and Efficiency Bottlenecks
For small parts that require batch processing, although multiple pieces can be arranged in a single run, the work area limits the maximum quantity per batch. As production demand grows, this machine can become a bottleneck—it cannot dramatically increase per-run output through layout optimization the way larger machines (such as 230×230 mm units) can.
¶ Solutions and Purchasing Advice
If you are choosing or already using this type of equipment, you can adopt the following strategies to mitigate the issues:
1. Clarify your core requirements: Confirm whether more than 95% of your workpieces are within 140 mm (leaving margin for edge distortion). If you frequently need to handle larger sizes, you should seriously consider larger-format models such as the Dual or AXI.
2. Pay attention to key hardware specs:
- The em-smart Basic comes standard with a 20W fiber laser source and a 110×110 mm F-theta lens.
- Confirm the brand/grade of the marking machine: Top-tier marking machine manufacturers (such as em-smart) deliver far better precision and repeatability than low-end machines.
3. Make good use of software features:
- Use the "Pincushion Distortion Correction" function in your marking software, and check it regularly to partially compensate for edge pattern distortion.
In summary, it can handle larger materials—but you need to clearly accept its inherent limits in ultimate precision, edge quality, and processing range. Before purchasing, you can contact our staff via the official website to send in your sample.
¶ What materials does the em-smart Basic support?
| Laser Type | Materials it primarily handles / can process (at 20W) | Materials it does not handle well / cannot process |
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| Fiber laser (~1064nm) |
All kinds of metals: stainless steel, aluminum (including anodized aluminum), copper, iron, brass, etc. Some plastics: ABS, PBT, silicone, PS, etc. Others: carbon fiber, synthetic leather. |
Transparent materials: ordinary glass (unless it has a special coating). Natural non-metals: wood (poor results, low efficiency), stone, ceramics. Highly reflective metals: such as pure gold and pure silver (difficult to process and may damage the equipment). |
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| White Acrylic | Black Acrylic | Zinc Alloy | Metal Business Card |
¶ Operating Recommendations: Where to Start
1. Identify the material type: We do not recommend marking materials that release toxic or hazardous smoke.
2. Safety testing: For any uncertain material, always run a small-scale test first. Observe the results and ensure good ventilation.
3. Optimize results: When doing fine engraving on a 110×110 mm work area, place the pattern as close to the center as possible to achieve the best precision and consistency.
¶ How long does laser engraving take?
em-smart Basic configuration: 20W fiber laser source and a 110×110 mm work area.
| Question | Detailed Answer |
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| Engraving time | Anywhere from a few seconds to several dozen minutes, depending on: 1. Pattern complexity: A simple logo may take only a few seconds; large-area deep engraving or intricate patterns may take several minutes to over ten minutes. 2. Material and depth: Shallow marking on metal is fast, but engraving with noticeable depth dramatically increases the time. 3. Parameter settings: Pursuing fine detail requires lower speed, higher power, and more passes—time multiplies accordingly. |
| Is it permanent? | Yes, it is permanent. Laser engraving creates a physical change by removing material from the surface. The mark is waterproof, wear-resistant, heat-resistant, and resistant to most chemicals. It will not disappear unless deliberately ground off with significant force. |
| Number of keychains per run | This depends on the keychain size. Taking the common 50×21 mm size as an example, after layout optimization, around 20–25 pieces can be arranged and engraved at once within the 110×110 mm work area. The number will vary if the keychains are larger or smaller. |
¶ Operating Recommendations
To ensure the best results, we recommend running a test before batch processing:
1. Always do a sample test first: Use scrap material to test results and times under different parameters (power, speed, fill density), and find the right balance between quality and efficiency.
2. Optimize layout: Use the array function in the software to tightly arrange patterns, and make sure each pattern stays within the effective processing area of the equipment.
3. Secure the workpieces: Use positioning bars to keep multiple keychains flat and stable, preventing some areas from going out of focus due to uneven height.
¶ Are the Safety Measures of em-smart Basic Effective?
When using a home laser engraving machine, safety is the top priority and is fully manageable. The key is to understand its hazard level and take the right protective measures.
| Protection Item | Protective Measures |
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| Laser beam protection | An optional fully enclosed safety cover is available. The optical path is fully sealed with no exposed laser emission port, and laser hazard warning labels are applied to key locations. |
| Smoke purification | An optional desktop smoke purifier is available. Filters must be replaced periodically to maintain proper airflow during marking. |
| Eye protection | Comes standard with dedicated 1064 nm laser safety goggles. Operators must wear them at all times, and any assistants entering the operating area must wear them as well. |