CNC machines for metal include mills, routers, and press brakes, but these machines do not solve the same manufacturing problem. A part that looks simple on a drawing can become expensive, slow, or difficult to control when the wrong process handles the material, geometry, tolerance, or bending requirement.
This guide compares CNC mills, CNC routers, and CNC press brakes from a metal part manufacturing perspective. You will see where each machine fits, where it reaches its limits, and which process makes better sense before you request a quote or approve production.
CNC Mills for Precision Metal Parts and Complex Features
A CNC mill is a computer-controlled machine tool that cuts solid metal stock into accurate parts. It uses rotating tools to remove material from a fixed workpiece, so it can create flat surfaces, holes, slots, pockets, threads, stepped profiles, and other machined features.
During CNC milling, the metal blank is clamped on a machine table, vise, or custom fixture. The spindle drives tools such as end mills, drills, reamers, boring tools, and taps. These tools follow programmed paths to remove material in controlled passes until the part reaches the required shape, size, and feature position.
CNC milling is often selected for parts such as:
- Aluminum housings
- Mounting blocks
- Precision plates
- Machine brackets
- Fixture components
- Mold inserts
- Mechanical components
- Parts with holes, pockets, threads, or mating surfaces
CNC Routers for Large Flat Parts and Light Metal Cutting
A CNC router is a computer-controlled cutting machine mainly used for flat sheets, plates, and large-format materials. In metal processing, it usually works on aluminum sheets, thin non-ferrous plates, and light metal panels that need outer profiles, openings, shallow slots, engraving, or simple hole patterns.
Routing begins after the sheet or plate is fixed on a wide machine bed. A high-speed spindle rotates the cutting tool, and the machine follows programmed cutting paths across the material surface. The tool can cut through the sheet or create shallow surface details, depending on the required outline, cutout, slot, or panel shape.
This process is more suitable for flat or large-area metal parts, including:
- Aluminum panels
- Sign plates
- Nameplates
- Thin metal covers
- Decorative metal sheets
- Control panels
- Large flat profiles
- Light-duty sheet components
CNC Press Brakes for Sheet Metal Bending and Forming
A CNC press brake is a sheet metal forming machine used to bend flat metal blanks into angled or formed structures. It does not cut material away like a mill or router. Instead, it uses controlled pressure to bend sheet metal into flanges, channels, brackets, covers, boxes, and enclosure shapes.
Press brake forming uses an upper punch, a lower die, and a back gauge to control the bend position and angle. The CNC system manages the bend depth, gauge movement, bend sequence, and repeat movement. As the punch presses the sheet into the die, the metal forms the programmed angle or shape.
Press brakes are mainly used for forming sheet metal parts such as:
- Sheet metal brackets
- Equipment covers
- Electrical enclosures
- U channels
- Formed rails
- Machine guards
- Protective panels
- Sheet metal frames and housings
CNC Mill vs CNC Router: What Are the Real Differences
CNC mills and CNC routers both cut material with rotating tools, but they behave very differently once metal enters the job. A mill is built for force, stability, and controlled geometry. A router is built for speed, wide sheet coverage, and lighter cutting. The real difference is not the tool shape. It is how much cutting load, depth, accuracy, and material resistance the machine can handle.
Machine Rigidity
Machine rigidity means the machine’s ability to stay stable when the cutting tool meets metal resistance. A CNC mill handles this cutting load better because it has a heavier frame, stronger spindle support, and a more stable worktable. These structures keep the cutter steady when machining steel, stainless steel, thick aluminum, deep slots, pockets, or accurate holes.
A CNC router focuses more on wide sheet coverage and fast light cutting. Its gantry structure helps it process large panels, but it cannot absorb heavy side force as well as a mill. When the cut goes too deep into metal, the tool may chatter, the edge may become rough, and holes or slots may lose position accuracy.
A simple example makes the difference clearer. A router may cut the outer profile of a 3 mm aluminum panel without much trouble. However, if the same part needs a 12 mm deep slot, threaded holes, or a flat mating surface with tight tolerance, a CNC mill gives better control. In metal machining, rigidity directly affects dimensional accuracy, surface finish, tool life, and repeatability.
Spindle Power and Cutting Depth
Spindle power, speed, and torque follow this relationship:
Torque (N·m) = 9550 × Power (kW) ÷ Speed (rpm)
This formula explains why a high-speed spindle does not always give stronger cutting.
A CNC router usually works in a higher speed range, often around 8000–30000 rpm. This helps the tool move quickly, but the available torque is lower. For example, a 6 kW spindle at 24,000 rpm produces about 2.4 N·m of torque. Because of this, router cutting depths in metal usually stay lighter, and the machine depends more on speed, sharp tools, and controlled chip removal.
A CNC mill runs many metal-cutting operations at lower spindle speeds, often around 1,000–8,000 rpm. At the same 6 kW, a spindle running at 2,000 rpm produces about 28.7 N·m of torque. That higher torque supports deeper tool engagement and more stable cutting when the tool enters the material with greater load.
This torque gap changes what each machine can do in real cutting. A router performs best when the cut stays shallow and fast. A mill can keep the tool engaged at greater depth because the spindle delivers more force at lower speed. Spindle speed supports cutting speed, but torque supports cutting depth.
Metal Material Compatibility
CNC mills cover a wider range of metals because they can handle higher cutting resistance. Aluminum, brass, copper, carbon steel, stainless steel, and titanium can all be machined on the right milling setup with suitable tooling, coolant, fixturing, and cutting parameters. This makes milling more practical for custom metal parts with different strength, wear, or corrosion requirements.
CNC routers are more selective with metals. They are commonly used for aluminum sheets, thin brass plates, and other light non-ferrous materials. They are not usually chosen for stainless steel blocks, hardened steel parts, titanium components, or heavy material removal. If the metal is hard, thick, or dimension-critical, a CNC mill gives a safer manufacturing route.
Accuracy and Feature Complexity
A CNC mill gives better control when a part needs accurate holes, flat contact areas, threaded features, or surfaces that must align with other components. It can machine pockets, slots, tapped holes, counterbores, bearing seats, sealing faces, and multi-side details while keeping the main dimensions more stable.
A CNC router is stronger in simpler flat work. It can cut outer profiles, windows, cutouts, shallow slots, engraved marks, and basic hole patterns on large sheets. However, it is not the best choice for deep cavities, fine-threaded features, close-tolerance mating surfaces, or parts that need machining on several faces. In simple terms, routers shape flat metal panels; mills build controlled metal geometry.
CNC Mill vs Press Brake: Machining from Solid vs Forming Sheet Metal
CNC milling and press brake bending create metal parts in very different ways. A CNC mill cuts material away from solid stock, while a press brake reshapes sheet metal through controlled bending. This difference affects the part structure, material use, tolerance control, and drawing requirements.
Manufacturing Method
CNC milling is a subtractive process. The machine starts with solid material and removes metal with rotating cutting tools. The toolpath controls where the cutter enters, how deep it cuts, and which surfaces or features it creates. This process can produce holes, pockets, slots, flat faces, threads, counterbores, grooves, and local details on different sides of the part.
Press brake bending works through force and deformation. The machine places a flat sheet between a punch and a die, then pushes the sheet to a controlled angle. The material does not become a new shape through cutting. It changes shape because the bend line, tooling, bend depth, and back gauge position guide the sheet into a flange, channel, angle, box, or formed profile.
Material Form and Usage
CNC milling begins with solid stock, such as a metal block, bar, thick plate, casting, or forged blank. The blank usually needs extra material around the final shape, because the machine must secure the workpiece, face reference surfaces, rough out the geometry, and leave allowance for finishing cuts. When the part includes deep pockets, internal cavities, or thin-wall sections, much of the original stock may be removed as chips.
Press brake forming uses material in a different way. The process starts with a flat sheet metal blank that is cut close to the developed flat pattern before bending. Instead of carving the part from a larger piece of metal, the press brake keeps most of the sheet in the final product and changes its shape through bends, flanges, and formed edges. Milling consumes material to create geometry; press brake forming preserves material while reshaping it.
Geometry Requirements
CNC milling fits parts that need solid sections, precise contact areas, local thickness changes, internal pockets, threaded holes, bearing seats, sealing faces, or multi-side machined details. The process gives engineers more freedom when one area needs a tight fit, another area needs clearance, and another area needs a pocket or slot for assembly.
Press brake geometry depends on sheet thickness, bend radius, flange length, bend direction, and tool access. The design must give the punch and die enough room to form each bend without collision. Sharp internal corners, very short flanges, closed box shapes, and bends too close to holes can create problems during forming.
Dimensional Control
CNC milling controls dimensions through programmed cutter movement and fixed datum references. After the workpiece is clamped, the machine cuts from defined coordinates, so the final size depends on toolpath accuracy, workholding stability, tool wear, and inspection setup. This method works better when the drawing requires fixed relationships between machined surfaces, holes, shoulders, and assembly faces.
Press brake bending controls dimensions through bend setup and material behavior. The back gauge positions the sheet, the punch and die form the bend, and the final shape depends on bend angle, flange length, bend radius, material thickness, tooling, and springback. Even if the flat blank is accurate, the part can still change after bending because the sheet metal relaxes after pressure is released. CNC milling controls cut dimensions; press brake bending controls formed dimensions.
CNC Router vs Press Brake: Cutting Flat Shapes vs Bending Sheet Metal
A CNC router and a press brake handle sheet metal from different directions. A CNC router creates the flat shape of a part, while a press brake turns that flat blank into a bent structure. In many sheet metal projects, these two machines are not direct replacements. They solve different problems in the same production route.
Cutting and Forming Capabilities
CNC routers and press brakes change sheet metal in different ways. A CNC router has cutting capability. It removes material from a flat sheet to create outer contours, internal openings, slots, holes, relief cuts, and surface marks. Its strength is controlling the 2D flat layout before the sheet becomes a formed part.
A press brake has forming capability. It does not remove material from the sheet. It bends the prepared blank along controlled bend lines to create angles, flanges, channels, returns, and folded structures. The main capability difference is simple: CNC routing controls material removal, while press brake bending controls material deformation.
Part Shape After Processing
CNC routing normally leaves the part in one plane. A routed aluminum panel may have cable openings, screw holes, corner radii, slots, or edge profiles, but the part still behaves like a flat sheet. This makes routing suitable when the design depends mainly on 2D shape and surface layout.
After press brake bending, the same sheet can gain height, direction, and stiffness. A flat blank can become a U-channel, folded cover, equipment bracket, machine guard, or enclosure body. The bend lines change the way the part carries load and fits into an assembly. This is why bent sheet metal parts usually need both a flat pattern view and a formed view in the drawing.
Design Constraints
CNC routing constraints come from tool geometry and sheet support during cutting. A round tool leaves a radius in internal corners, so the designer cannot expect sharp inside corners without secondary processing. Thin webs, narrow slots, small holes, and weak hold-down areas also need attention because the sheet may vibrate or lift during cutting.
Press brake bending is limited by bend geometry, tooling access, and material behavior. The design must leave enough flange length, bend radius, and clearance for the punch and die. Holes too close to the bend line can stretch or distort. ASM International explains that variations in bending stresses cause springback after sheet metal bending, so bend angle and radius cannot be treated like simple cut dimensions.
Production Sequence
For many sheet metal parts, cutting comes before bending. The CNC router first creates the flat blank. Then the press brake forms that blank into the required angles and flanges. This order keeps the sheet flat during cutting, which helps with hold-down, tool access, and dimensional layout.
The sequence becomes important when a part has both openings and bends. If the part is bent too early, it may no longer sit flat on the router bed, and some cut areas may become difficult to reach. Flat cutting should usually be completed before bending, while the bend sequence should be reviewed before the blank is released to production.
CNC Mills, Routers, and Press Brakes Comparison Table
CNC mills, CNC routers, and press brakes support different metal manufacturing tasks. CNC mills create precision-machined geometry, CNC routers cut large flat sheet layouts, and press brakes form sheet metal into bent structures. Their differences become clearer when compared by process, material form, feature capability, and main limitation.
| Comparison Point | CNC Mills | CNC Routers | CNC Press Brakes |
| Main Process | Material removal from solid metal stock | Flat cutting on sheets or plates | Sheet metal bending and forming |
| Starting Material | Block, bar, plate, casting, or forged blank | Flat sheet, plate, or panel | Cut sheet metal blank |
| Best Metal Fit | Aluminum, steel, stainless steel, brass, copper, titanium | Aluminum sheets, thin brass, light non-ferrous plates | Aluminum sheet, steel sheet, stainless sheet, galvanized sheet |
| Key Features | Holes, pockets, threads, mating surfaces | Profiles, cutouts, slots, simple holes | Bends, flanges, channels, covers |
| Main Limitation | Higher material removal and setup cost for simple sheet parts | Limited rigidity for hard metals, deep cutting, and tight-tolerance features | Cannot create machined pockets, threads, deep holes, or complex 3D cut features |
| Best Use Case | Parts that need accurate machined geometry | Large flat parts that need fast light cutting | Sheet metal parts that need bends, flanges, and formed structure |
How to Choose the Right CNC Machine for Metal Parts?
The right CNC machine depends on the part’s form, material, features, tolerance, quantity, and process route. A solid precision part, a flat sheet part, and a bent sheet metal part usually need different manufacturing logic, even when all of them are made from metal.
Identify the Part Form
Start with the basic form of the part. A thick block-like part usually points toward CNC milling because the design depends on machined geometry. A flat plate or panel may fit CNC routing when the main requirement is profile cutting. A part with bends, flanges, or formed sides belongs closer to press brake forming.
This step helps you avoid forcing the wrong process onto the drawing. For example, a flat aluminum front panel does not need the same machine as a steel mounting block with pockets and threaded holes. A folded enclosure also should not be treated like a milled solid part unless it has extra machined features.
Match the Material Type
Material choice should narrow the machine options by looking at metal grade, thickness, hardness, and starting form. Thin aluminum sheet, thin brass plate, and other light non-ferrous sheets may fit CNC routing when the part mainly needs flat cutting. Aluminum blocks, thicker plates, stainless steel, steel, brass, copper, or titanium parts with deeper machined areas usually point toward CNC milling because the machine must handle higher cutting resistance.
Sheet metal materials should be judged by their bending behavior. Aluminum, mild steel, stainless steel, and galvanized steel can be press-brake formed when the design uses bends, flanges, covers, channels, or enclosure shapes. However, thickness, bend radius, cracking risk, coating condition, and springback will affect whether the material can bend cleanly. Use this rule: a thin sheet with flat cutting may suit routing; a sheet with bends needs press brake forming; thick stock or harder metals usually need CNC milling.
Check the Key Features
Look at the features that make the part functional. Holes, threads, pockets, counterbores, mating faces, and bearing seats usually need CNC milling because they depend on toolpath control and accurate feature position. Flat profiles, cutouts, slots, and simple openings may fit CNC routing when the part stays sheet-based.
Bends, flanges, channels, return edges, and formed sides require press brake bending. If one part includes both cutouts and bends, the flat blank and bend sequence must work together. If it also needs threaded holes or precision faces after bending, CNC machining may become a secondary operation.
Define the Required Tolerance
For CNC milling, a common general tolerance for custom metal parts is often around ±0.05 mm to ±0.10 mm. If the part has critical machined features, such as bearing seats, precision holes, sealing faces, or tight mating surfaces, CNC milling may target a tighter range, such as ±0.01 mm to ±0.03 mm, depending on material, feature size, tool length, fixture stability, and inspection method.
CNC routing and press brake forming follow different tolerance logic. CNC routing on flat metal sheets is usually more suitable for general profile control, such as ±0.10 mm to ±0.30 mm, depending on sheet size, cutter diameter, hold-down stability, and edge quality. Press brake bending focuses on bend angle, flange length, and formed size. A common bend angle tolerance may fall around ±0.5° to ±1°, while formed dimensions can vary with material thickness, bend radius, tooling, and springback.
Compare Quantity and Cost
Prototype and low-volume parts often favor processes with lower setup burden and flexible adjustment. CNC milling works well for custom precision parts because the toolpaths can be changed without dedicated forming tools. However, the cost can rise when the design removes too much material from solid stock.
Batch sheet metal parts may become more cost-effective when they use cutting and press brake forming. The material stays closer to the final shape, and repeat bends can be produced more consistently after the setup is confirmed. Cost should include programming, fixturing, cutting time, bending setup, finishing, inspection, and material waste, not only the machine hourly rate.
Decide the Process Combination
A single machine is enough when the drawing has one clear manufacturing need. Once the part combines different feature types, the process route should also combine machines. The simplest rule is to match each critical feature to the process that controls it best: routing handles the flat layout, press brake forming handles bends, and milling handles precision machined details.
You can judge the process combination this way:
- Flat cutting + bends: CNC routing + press brake forming
Sheet metal parts with openings, slots, outer profiles, and formed flanges usually need cutting before bending. - Bends + precision features: press brake forming + CNC milling
A formed bracket or cover may still need accurate holes, machined contact faces, or tighter assembly areas after bending. - Large flat shape + local accuracy: CNC routing + CNC milling
Routing can create the large outside profile, while milling controls holes, pockets, or mating areas that need tighter accuracy. - Flat cutting + bends + machined details: CNC routing + press brake forming + CNC milling
Some parts need a flat layout first, a formed structure second, and precision-machined features after the main shape is created.
Key Design Factors Before Ordering Custom Metal Parts
Before custom metal parts move into quotation or production, the drawing should make the design intent clear, not just show the final outline. The details behind dimensions, machined areas, bends, materials, finishes, and inspection requirements can affect whether a part is milled, routed, bent, or made through a combined process.
Critical Dimensions and Datums
Critical dimensions are the measurements that affect fit, alignment, sealing, movement, or assembly. These may include hole center distance, mounting surface location, shaft position, sealing face height, slot position, or the distance between a bent flange and a mating component. These dimensions should be marked clearly because they control the part’s function.
A drawing should define the reference used for machining and inspection. A milled housing may use a flat machined face as the datum, while a bent sheet metal part may use a flange, bend edge, or hole pattern. When GD&T controls are used, ASME Y14.5 helps keep the tolerance language consistent. Clear datums ensure critical features are measured from the same reference used for assembly.
Machined Features
Machined features require size, depth, position, and function notes. A drawing should show whether a hole is through or blind, what thread type is required, how deep the thread goes, and whether counterbores, countersinks, pockets, grooves, or slots need special tolerance. A machined feature is only clear when the drawing explains what must be controlled.
A routed hole pattern may be enough for a flat cover, but a tapped hole, bearing seat, sealing face, or controlled pocket needs milling details. A bent bracket may look simple, but post-bend holes, contact faces, or threaded areas should be identified before production starts.
Sheet Metal Bending Details
Sheet metal bending details should define the bend angle, inside bend radius, flange length, bend direction, and dimension reference. The drawing should also state whether the size is measured from the inside surface, outside surface, formed edge, or bend centerline.
Bending details become critical when holes, slots, cutouts, or short flanges sit near a bend line. A hole placed too close to the bend may stretch or shift during forming, and a short flange may not have enough contact area for stable bending. Springback also needs attention because the sheet can slightly open after pressure is released.
Material Grade
Material grade belongs in the drawing title block, material note, or RFQ information, not only in the part name. A clear material callout should include the exact grade, stock form, thickness or size, temper, hardness, or surface condition when these details affect machining, bending, or finishing. For example, “Aluminum 6061-T6, plate, 12 mm thickness” is much clearer than only writing “aluminum part.”
This detail affects more than material purchasing. Different grades within the same material family can have different strength, machinability, corrosion resistance, forming behavior, and finishing response. Material grade, thickness, hardness, temper, and supplied form should be confirmed before quotation because they affect cutting load, bend behavior, tool wear, finish options, and final cost.
Surface Finish and Edge Treatment
Surface finish describes the required condition after machining, routing, or bending. A sealing face may call for a controlled roughness value. A visible aluminum part may need bead blasting and anodizing. Stainless steel components can use passivation. A coated or plated part may need protected threads, masked contact areas, or controlled fits after finishing.
Edge treatment should also be defined clearly. Routed sheet edges can require deburring, while milled holes and pockets may use chamfers or broken edges. Bent sheet metal edges should be cleaned before forming or coating when burrs could affect fit, finish, or handling. If an edge touches a cable, seal, mating part, hand-contact area, or visible surface, the drawing should state the required edge condition.
Inspection and Acceptance Requirements
Inspection requirements need to match the part type and the features that affect assembly. A routed panel, a milled housing, and a press brake part should not be reviewed in the same way because each process controls different dimensions and risks.
Typical inspection points include:
- CNC routed parts: Verify profile size, cutout location, hole position, edge quality, burr level, and sheet flatness.
- CNC milled parts: Measure critical dimensions, hole position, thread quality, flatness, pocket depth, mating surfaces, and CMM report requirements when needed.
- Press brake parts: Inspect bend angle, flange length, formed width, bend direction, and hole position after bending.
- Combined-process parts: Confirm the relationship between routed cutouts, bent features, and machined areas after all processes are complete.
Acceptance requirements define what qualifies as a finished part. The drawing or RFQ should list required inspection reports, appearance limits, thread gauge checks, bend angle checks, and any critical dimensions that must be recorded. Clear inspection notes help reduce disputes because the finished part is reviewed against the same requirements used for quotation and production.
In-House Machining vs Outsourcing Custom Metal Parts
In-house machining gives a company direct control over equipment, scheduling, and process knowledge, but it also requires machines, tooling, trained staff, inspection capacity, and a steady workload. Outsourcing custom metal parts makes more sense when the project needs flexible CNC milling, routing, press brake forming, or combined processes without building a full metalworking setup internally.
Equipment Investment and Operating Cost
Buying a CNC mill, CNC router, or press brake is only the first cost. A working setup also needs cutting tools, tool holders, fixtures, CAD/CAM software, coolant, measuring tools, spare parts, machine maintenance, floor space, electricity, and trained operators. If one project needs milling, routing, and bending, the investment can spread across several machines rather than one.
Outsourcing changes the cost structure from machine ownership to project-based production. The company does not need to carry idle machine time, tool storage, machine repair, software updates, or operator training when the workload is not steady. In-house machining makes more sense when part demand is stable and repeatable; outsourcing is more flexible when designs, quantities, and process needs change from project to project.
Technical Skill and Process Experience
Metal cutting and forming require more than machine access. CNC milling needs programming, tool selection, feed and speed control, fixture planning, datum setup, and tolerance management. CNC routing needs sheet hold-down, cutter choice, chip control, and edge quality control. Press brake forming needs bend sequence planning, tooling selection, springback adjustment, and material behavior knowledge.
A machine can follow a program, but it cannot replace judgment. A part may fail because the tool is too long, the fixture is weak, the bend radius is too tight, the thread depth is unclear, or the inspection datum is wrong. In-house machining depends on the internal team’s experience; outsourcing gives access to teams that already work across different metals, features, tolerances, and production routes.
Supplier Support for Complex Metal Parts
A professional machining supplier can review drawings before production and identify details that may affect manufacturability, cost, or lead time. This support may include material suggestions, machining process selection, fixture planning, tolerance review, bend feasibility checks, surface finishing advice, and inspection planning. These steps help reduce design assumptions before the part reaches production.
This becomes more valuable when a project moves from prototype to repeat production. A prototype may prove the shape, but repeat orders need stable setup, consistent inspection, finish control, and clear process documentation. For complex custom metal parts, outsourcing provides more than extra machine capacity. It helps connect drawing review, process planning, surface finishing, and production consistency from early samples to repeat orders.
Conclusion
CNC machines for metal do not serve the same purpose. CNC mills are better for precision machined parts with controlled geometry, CNC routers are better for large flat sheet cutting, and CNC press brakes are better for bending sheet metal into formed structures. The right choice depends on the part form, material grade, feature details, tolerance needs, quantity, and whether one machine can complete all critical requirements.
Before approving a custom metal part for production, review the drawing carefully and confirm the process route. If the part includes flat cutting, bends, machined holes, threads, mating surfaces, or finishing requirements, it may need more than one process. DZ Making can review your drawings, material requirements, tolerances, and surface finish needs to help determine whether CNC milling, routing, press brake forming, or a combined manufacturing route makes the most sense for your project.
FAQs
1. What is the best CNC machine for metal?
The best CNC machine for metal depends on the part design, not the machine name. CNC mills are better for precision metal parts with holes, threads, pockets, mating surfaces, and tighter tolerances. CNC routers fit large flat sheet cutting, especially light metal panels. CNC press brakes are better when sheet metal needs bends, flanges, channels, covers, or formed structures.
2. What is the difference between a mill and a router?
The main difference between a CNC mill and a CNC router is cutting strength and part type. A CNC mill has stronger rigidity and better control for solid metal parts, deeper features, accurate holes, threads, and machined surfaces. A CNC router has a larger working area and higher spindle speed, so it works better for flat sheets, panels, cutouts, and light metal profiles.
3. Can a CNC router cut metal?
Yes, a CNC router can cut some metals, especially aluminum sheets, thin brass plates, and light non-ferrous metal panels. It can handle profiles, slots, cutouts, shallow engraving, and simple hole patterns when the material thickness and setup are suitable. However, hard metals, deep cutting, threaded features, and tight-tolerance parts usually need CNC milling.
4. Is CNC milling better than sheet metal bending?
CNC milling is better when the part needs solid geometry, accurate holes, threads, pockets, flat mating surfaces, or tight dimensional control. Sheet metal bending is better when the part can be made from a flat sheet with bends, flanges, covers, brackets, channels, or enclosure shapes. Milling controls machined details, while bending creates formed sheet metal structures with better material use.
5. Which CNC machine is better for aluminum parts?
The better CNC machine for aluminum parts depends on the aluminum form and required features. CNC milling works better for aluminum blocks, housings, fixtures, precision plates, and parts with threads, pockets, or tight surfaces. CNC routing suits large aluminum sheets, thin panels, nameplates, and flat profiles. CNC press brakes handle aluminum brackets, covers, flanges, and bent enclosure parts.
6. Can one metal part require milling, routing, and bending?
Yes, one metal part can require milling, routing, and bending when the drawing includes flat cutting, formed bends, and precision-machined details. For example, a sheet metal enclosure may need routing for cutouts, press brake forming for flanges, and CNC milling for accurate mounting faces or threaded holes. Combined processing is common in non-standard custom metal part projects.
