Desktop 5-Axis CNC Glossary — Terms Explained
Buying a desktop 5-axis machine means wading through jargon. Here are the terms that actually matter, in plain language. Comparing machines? Start with our guide to desktop 5-axis machining or the machine selection quiz.
The core terms
5-axis machining
Milling where the cutter or part can move along five axes at once — the three linear axes (X, Y, Z) plus two rotary axes. It lets you reach multiple faces, undercuts and curved surfaces of a part in a single setup, instead of unclamping and re-fixturing for each side.
3-axis machining
Milling that moves only along X, Y and Z (left/right, front/back, up/down). The tool always approaches from one direction, so multi-face parts need several setups. Cheaper and simpler — ideal for flat, prismatic parts and 2.5D work.
A and B axes (rotary axes)
The two rotational axes a 5-axis machine adds to X, Y and Z. On the Pocket NC, the A axis rotates the part and the B axis tilts it, presenting different faces to the cutter without a manual re-clamp.
Simultaneous 5-axis
All five axes moving at the same time, so the tool sweeps continuously along complex contours — impeller blades, organic and anatomical shapes. This is geometry that 3-axis simply cannot follow.
3+2 (positional / indexed) 5-axis
The two rotary axes position the part at a fixed angle, then the machine cuts in 3-axis. You get multi-side access and undercuts without the CAM complexity of continuous motion. It covers a large share of real-world "5-axis" work. The Pocket NC does both 3+2 and simultaneous.
Undercut
A feature that overhangs or faces inward — a dovetail, a back-drafted pocket, an angled hole. A 3-axis tool approaching straight down can't reach it; tilting the part on a 5-axis machine can.
Setup (work-holding setup)
One clamping of the part. Every additional setup on a 3-axis machine re-introduces small alignment errors that stack. A 5-axis machine often finishes a part in a single setup, so all features share one datum.
G-code
The standard language CNC machines read — coordinates and commands generated by CAM software. The Pocket NC runs standard G-code through its browser-based Kinetic Control software.
CAM (Computer-Aided Manufacturing)
Software that turns a 3D model into toolpaths and G-code (e.g. Autodesk Fusion). 5-axis CAM is more involved than 3-axis because it plans tool orientation as well as position.
Grade 5 titanium (Ti-6Al-4V / G5)
The most common aerospace/medical titanium alloy — strong and hard to machine. The Pocket NC can cut up to G5 titanium; the V2-50's 50,000 RPM spindle extends into harder alloys and finer tooling.
Surface finish / scallop
The small ridges left when a ball-nose tool steps across a curved surface. 5-axis lets you tilt the tool to cut on its flank rather than its tip, leaving a finer finish in less time.
Desktop / benchtop CNC
A machine small enough to sit on a workbench and run from a standard single-phase mains socket (230 V), versus an industrial VMC needing three-phase power and a dedicated floor.
Authorised distributor
A reseller officially appointed by the manufacturer, supplying genuine machines and parts with full warranty standing. CycleCNC is the authorised European distributor for Penta Machine Co.
Still deciding?
Read the guide to desktop 5-axis machining, compare the V2-10 and V2-50, or see how buying in Europe works.
