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Horizontal vs. Vertical CNC Machines: What’s the Difference?
Milling is one of the various processes used in machining. In milling, the rotating cutting tool removes material from the stationary or moving workpiece. There are different types of milling machines, including horizontal and vertical. In this article, we will discuss the differences between these two machines and how to choose one.
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What is a Vertical CNC Machine?
A vertical CNC machine is a type of CNC machine in which the cutting tool is oriented vertically above the workpiece. The tool rotates and moves down to cut material as directed by programmed instructions. Nowadays, two types of vertical machines are used:
- Turret Mills:Turret mills are generally used when machining smaller precision parts. In turret mills, the spindle remains stationary, and the bed moves in both horizontal and vertical directions. Its advantages are that it prevents vibration and provides excellent rigidity during the machining of intricate features.
- Bed Mills:The most common type of vertical CNC machine found in machine shops is the bed mill. In bed mills, the spindle moves vertically, and the workpiece moves horizontally. With this arrangement, it can be used to efficiently machine slots, pockets, holes, and complex geometries.
Source: HAAS
Advantages of Vertical CNC Machine
- Easy Setup and Operation
Vertical CNC machines allow an operator to see the complete cutting operation. With an open cutting area, tool position and measurement adjustments can be made easily.
- Versatile
The vertical CNC machine can perform various functions, including drilling, end milling, fresado frontal, and tapping.
- Cost Efficient
Vertical CNC machines are much less expensive than horizontal machines. Tools required for vertical milling machines are cheaper and more readily available.
- Precisión
With a proper setup, vertical CNC machines are capable of producing parts with a tolerance of 0.001 inches.
Disadvantages of Vertical CNC Machine
- Limited Cutting Capacity
It becomes very difficult to remove large volumes of material at once (rapidly) with vertical CNC machines. Vertical milling machines have limited cutting capacity.
- Poor Chip Evacuation
Chips produced during vertical CNC machining fall under the forces of gravity to fall onto the finished machined component. Chips fall into freshly cut cavities and can create scratches on the machined surface of the finished part, damaging it.
- Not Suitable for Mass Production
Each face of each workpiece must be individually set up and positioned. Manually handling each part will cause many production bottlenecks when building thousands of similar workpieces.
What is a Horizontal CNC Machine?
In horizontal CNC machines, the spindle is parallel to the floor. The cutting tool extends horizontally outward from the column and targets downward towards the workpiece. This simple re-arrangement can provide significant advantages when it comes to manufacturing.
A workpiece is typically mounted horizontally perpendicular to the spindle on a table. Most horizontal CNC machines come standard with at least one of the four rotary indexing tables or a 4th axis feature. The automated rotation allows the cutting tool to machine multiple faces of a workpiece without manual handling. Horizontal CNC machines can machine four and, in some cases, five sides of a part at a time.
Source:DMG MORI
Advantages of Horizontal CNC Machine
- Excelente evacuación de viruta
The chips drop down away from the workpiece at an angle due to the effect of gravity. This means the chips do not interfere with the machining process or settle on the finished surface of the part(s).
- High Volume Production
An automatic pallet changer can be used to produce the first part while the second is being loaded externally. The changer switches the pallet automatically when the original has completed its run. This drastically reduces idle time between projects, maximizing machine utilization.
- Alta tasa de remoción de material
The horizontal configuration of the machine allows for aggressive cutting parameters. By allowing the operator to increase the feed rate and depth of cut, the production time of large parts is reduced.
- Acabado superficial
The amount of vibration generated from the machine is minimal due to the clean chip evacuation process. This produces parts that are of superior finish consistently.
Disadvantages of Horizontal CNC Machine
- Higher Cost
The upfront purchase price is often three times to five times higher than comparable vertical CNC machines. Installation tooling, fixtures, and accessories are priced at a premium, adding to the total cost of ownership.
- Complex Setup
Requires advanced programming knowledge of rotary positioning and multi-axis coordination. Horizontal CNC machines have a more complex and time-consuming fixture design process.
Horizontal vs. Vertical CNC Machines: Key Differences
Spindle Orientation
Vertical Milling Machines: The spindle is oriented vertically, with the cutting tool pointing downwards towards the table.
Horizontal Milling Machines: The spindle is oriented horizontally, with the spindle extending outward parallel to the floor. The cutting tool approaches the workpiece from the side instead of the top.
Geometría de la herramienta
Vertical Mills: Vertical mills most commonly use fresas de extremo, molinos frontalesy brocas. Tool length can be critical to machining efficiency. Because, as the tool length increases, the deflection of the tool will increase as well during operation.
Horizontal Mills: Horizontal mills use an arbor system on which they typically mount their cutters (side mills, face mills). The arbor provides two points of contact for support and also, therefore, provides much greater rigidity than a vertical mill.
Costo
Vertical Mills: Vertical mills are significantly less expensive to purchase than horizontal mills. Operating costs for vertical mills are also reasonable, since tooling and replacement parts can be purchased at very competitive rates.
Horizontal Mills: Horizontal mills generally require an initial capital investment. Operating costs for horizontal mills are high due to specialized tools, tooling, and replacement parts, and the need for continuous maintenance.
Evacuación de chips
Vertical Mills: Chips produced during the production of vertical mills fall onto the work surface below. This creates several problems, including the need for continual clean-up. Since they may scratch finished parts or interfere with the workpiece during the machining process.
Horizontal Mills: The chips created by running a horizontal mill are not an issue. Gravity automatically removes the chips from the horizontal cutting area. Therefore, the horizontal cutting area remains completely free of chips.
Cutting Specifications
Vertical Milling Machines: Suitable for moderate material removal and cutting depths. Vertical milling works fine, making intricate pieces for limited amounts of cutting, but it is not appropriate for heavy roughing operations.
Horizontal Milling Machines: This type of milling machine is designed for high-volume production with heavy cut depths and high feed rates. Also, this machine is built to be extremely rigid through its setup. It is designed for aggressive cutting parameters without compromising on the dimensional accuracy of the workpiece or tool life.
Production Volume
Vertical Milling Machines: Vertical milling machines are most suitable for low to medium volumes.
Horizontal Milling Machines: The horizontal milling machine is built for manufacturing processes with high production volumes. As a dedicated machine with an automatic pallet changer feature, combined with faster cycle times, this machine is best designed to manufacture large quantities of identical parts.
Velocidad de eliminación de material
Vertical Milling Machines: vertical milling machines have material removal capabilities of moderate to heavy.
Horizontal Milling Machines: Horizontal milling machines produce superior rates for material removal when configured for continuous cutting. Continuous cuts provide considerably shorter cycle times when machining many components.
Sides of Machining
Vertical Milling Machines: You can only access the top side of the part. To completely machine a multi-sided part, you will need to set up a new workholding and indicating for each machining operation.
Horizontal Milling Machines: Rotary tables allow you to have access to 4 or 5 sides of a part in a single setup. Once you set up the first part, the machine will automatically start and run through additional operations without requiring any intervention from the operator.
How to Choose Between Horizontal vs. Vertical CNC Machines
Here are some factors to consider when choosing between horizontal and vertical CNC machines:
Part Complexity
You need to determine how many parts you want to manufacture. As an example, vertical CNC machines are best suited for low to medium volumes where only dozens or hundreds of parts are manufactured. If you are manufacturing thousands of identical parts nonstop, then using a horizontal CNC machine with automatic pallet changers is worth it.
Part Size
If you need to machine multiple sides of the part, the horizontal CNC machine is the better choice. With a horizontal CNC machine, you can secure a rotary table to access four or five sides of your part. This allows you to eliminate the need to reposition the part multiple times to ensure the part is properly machined. If the part only has features on one or two sides, then a vertical CNC machine is the best choice. The extra complexity involved in setting up the part multiple times does not justify the benefits of using a multi-axis machine.
Vertical milling machines effectively process small to medium components due to the simplicity of loading and the compact design. Components measuring less than 20 inches fit vertically and are ideal for use with vertical machining centres.
Tipo de material
Hard materials (specifically titanium and hardened steel) generally require aggressive cutting speeds and feeds. This is best accomplished using the added rigidity of a horizontal machining centre. Softer materials, such as plastics and aluminium, can be machined without the additional capabilities of a horizontal machining centre.
Space Availability
There are several reasons why vertical machining centres are a good fit for small shops. They take up less floor space and require little clearance for operation. In contrast, horizontal machining centres take up significantly more floor space due to the amount of room required for a longer spindle, pallet changers, and chip conveyors.
FAQs About Horizontal vs. Vertical CNC Machines
What is the difference between a vertical vs horizontal milling machine?
The main difference between the horizontal and vertical types of milling machines is the spindle orientation. In vertical milling machines, the spindle is perpendicular to the table surface. In horizontal milling machines, the spindle is parallel to the table surface. The chip evacuation process and cutting capabilities are influenced by this difference in spindle orientation.
What materials can be milled horizontally?
Horizontal milling machines can be used to machine different materials. Examples are aluminum, steel, stainless steel, titanium, brass, and plastic. Horizontal milling is particularly suitable for milling hard materials.
Which is more accurate: horizontal vs. vertical CNC machining?
Both horizontal and vertical machines can achieve similar levels of accuracy. Horizontal machines are more accurate when performing heavy cutting, due to their increased rigidity. Vertical machines can achieve the same level of accuracy for lighter operations.
What are the disadvantages of horizontal milling machining?
The most common disadvantages of using a horizontal machine are that they cost much more than vertical machines and require a larger amount of floor space. The setup and programming are complex.
Which milling machine is cost-effective?
Most milling shops use vertical milling machines because they usually offer the best price-to-performance ratio. Vertical milling machinescost less than horizontal machines. Vertical tooling is readily available and is typically low-cost compared to the horizontal tooling required for a horizontal machine.
Conclusión
The choice of a CNC mill depends largely upon your production requirements and your budget restrictions. Vertical mills can typically handle many different machining applications, provide the best overall versatility, and offer a cost-effective option to most businesses. Horizontal mills are ideal for manufacturing at large-scale operations where increased productivity is essential.
