computer science

Multiaxis machining

Multiaxis machining is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Multiaxis machining rather than just read about it. In short: Multiaxis machining is a manufacturing process that involves tools that move in 4 or more directions and are used to manufacture parts out of metal or other materials by removing excess material through milling, water jet cutting, or laser cutting. This type of machining was originally performed mechanically on large complex machines.

Key takeaways

Multiaxis machining belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Multiaxis machining to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Multiaxis machining from memory before moving on to harder problems.

Reference excerpt

Multiaxis machining is a manufacturing process that involves tools that move in 4 or more directions and are used to manufacture parts out of metal or other materials by removing excess material through milling, water jet cutting, or laser cutting. This type of machining was originally performed mechanically on large complex machines. These machines operated on 4, 5, 6, and even 12 axes which were controlled individually via levers that rested on cam plates. The cam plates offered the ability to control the tooling device, the table in which the part is secured, as well as rotating the tooling or part within the machine. Due to the machines size and complexity it took extensive amounts of time to set them up for production. Once computer numerically controlled (CNC) machining was introduced it provided a faster, more efficient method for machining complex parts. Typical CNC tools support translation in three axes; multiaxis machines also support rotation around one or multiple axes. Five-axis machines are commonly used in industry in which the workpiece is translated linearly along three axes (typically x, y, and z) and the tooling spindle is capable of rotation about an additional two axes. There are now many computer aided manufacturing (CAM) software systems available to support multiaxis machining including software that can automatically convert three-axis toolpaths into five-axis toolpaths. Prior to the advancement of CAM, transferring information from design to production often required extensive manual labor, generating errors and resulting in wasted time and material. There are three main components to multiaxis machines:

The machines physical capabilities i.e. torque, spindle speed, axis orientation/operation. The CNC drive system, the components that move the machine. This includes servo-motors, rapid traverse systems, ball screws, and how positioning is monitored. The CNC controller, this is how data is transferred/stored within machine, and input data is processed and executed. Multiaxis machines offer several improvements over other CNC tools, at the cost of increased complexity and price of the machine:

The amount of human labor is reduced, if the piece would otherwise have to be turned manually during the machining. A better surface finish can be obtained by moving the tool tangentially about the surface (as opposed to moving the workpiece around the spindle). More complex parts can be manufactured, particularly parts with curved holes. Increased tool life due to the ability to achieve optimal angles between the tool and machining surface. Higher quality parts. What once required multiple setups now can be executed in only a few if not one, reducing steps and decreasing the opportunity for error. The number of axes for multiaxis machines varies from 4 to 9. Each axis of movement is implemented either by moving the table (into which the workpiece is attached), or by moving the tool. The actual configuration of axes varies, therefore machines with the same number of axes can differ in the movements that can be performed.

Applications Multiaxis CNC machines are used in many industries including:

Aerospace industry: Multiaxis machines are used in the manufacturing of aircraft parts, which allow for complex parts to be made efficiently. Automotive industry: Multiaxis CNC machines create engine housings, rims and headlights. Furniture industry: CNC lathes mass-produce wooden table legs as well as most other components. Medical industry: Multiaxis CNC machines create custom hip replacements, dental implants, and prosthetic limbs. Multiaxis machining is also commonly used for rapid prototyping as it can create strong, high quality models out of metal, plastic, and wood while still being easily programmable.

Computer-aided manufacturing (CAM) software CAM software automates the process of converting 3D models into tool paths, the route the multiaxis machine takes to mill a part (Fig. 1). This software takes into account the different parameters of the tool head (in the case of a CNC router, this would be the bit size), dimensions of the blank, and any constraints the machine may have. The tool paths for multiple passes can be generated to produce a higher level of detail on the parts. The first few passes remove large amounts of material, while the final, most important pass creates the surface finish. In the case of the CNC lathe, the CAM software will optimize the tool path to have the central axis of the part align with the rotary of the lathe. Once the tool paths have been generated, the CAM software will convert them into G-code, allowing the CNC machine to begin milling. CAM software is currently the limiting factor in the capabilities of a multiaxis machine with ongoing development. Recent breakthroughs in this space include:

Topology optimization, an algorithm that refines 3D models to be more efficient and cost-effective on CNC machines. Automated recognition of 3D model features, which can simplify tool path generation by identifying instructions for the machine to follow from the features of the 3D model.

Illustrations

Worked examples

Example 1 — a first encounter with Multiaxis machining

Start with the simplest possible case. Write down what Multiaxis machining claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Multiaxis machining before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Multiaxis machining ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Multiaxis machining

In research: Multiaxis machining appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Multiaxis machining in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Multiaxis machining is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer-aided engineering, Machining, so understanding it makes those chapters shorter.
In everyday life: Look for Multiaxis machining outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Multiaxis machining in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Multiaxis machining means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Multiaxis machining out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Multiaxis machining in simple terms?

Why does Multiaxis machining matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Multiaxis machining?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Multiaxis machining.