5 Axis Machining: New Possibilities in Manufacturing

A 5 axis machine adds two rotary axes to the familiar X, Y and Z travels. The table or the spindle tilts, so the cutting tool can approach a face from an angle instead of only straight down. That single change removes the need to unclamp a part, rotate it by hand, and re-zero it for the next face.

On a 3 axis mill, every new face means a new fixture setup. Each setup adds locating error, and those errors stack. A part with five machined faces might see three or four setups on a 3 axis machine. The same part on a simultaneous 5 axis center often runs in one. Hole-to-hole position holds much better when the part never moves relative to the spindle datums.

The two rotary axes are usually labeled A and B, or A and C depending on the builder. Trunnion machines swing the part; gantry and head-tilt machines swing the tool. Both reach the same goal: keep the cutter normal to the surface and let the tool flank do the work.

The clearest case is a part with features on many faces. Impellers, turbine housings, medical instrument bodies, and engine brackets all fall here. If a drawing calls out true position between holes on opposite faces, one-setup machining is the simplest way to hold it.

Contoured surfaces are the second case. A mold insert with a deep, steep wall is hard to cut with a ball nose tool held vertically. Tilting the tool lets a shorter, stiffer cutter reach the wall, which reduces chatter and improves finish. We see this often on aluminum and tool steel molds.

Short tools matter more than people expect. A tool that sticks out 100 mm deflects far more than one that sticks out 40 mm. Tilting the head to reach a cavity with a short tool can cut cycle time and raise surface quality at the same time.

Thin-wall parts also benefit. When the tool stays normal to a wall, cutting forces push along the wall rather than bending it. Wall thickness down to a few tenths of a millimeter becomes repeatable instead of a gamble.

• 1
  Many faces, one setupHoles and slots on 4+ sides, held to a single datum.
• 2
  Steep or deep contoursMold cavities, impeller blades, curved housings.
• 3
  Thin wallsTool normal to the wall, less deflection.
• 4
  Hard-to-reach pocketsShort rigid tools where a 3 axis spindle cannot fit.

Not every part needs five axes. A flat plate with holes drilled from one side runs faster and cheaper on a 3 axis mill. Programming is simpler, cycle time is shorter, and the operator can inspect features without rotating the part.

Prismatic parts with two or three faces are also a good fit for 3 or 4 axis work. Setup cost is low when the faces are easy to reach, and the extra rotary motion adds nothing. Choosing 5 axis here just adds machine-hour cost.

There is a programming side too. Simultaneous 5 axis toolpaths need CAM software that handles collision checking and post-processing correctly. A shop without that skill will burn more time in prove-out than it saves in cutting. The process only pays when both the machine and the programmer are ready.

Roughing is often best left on a 3 axis strategy even on a 5 axis machine. The rotary axes are used for finishing, where tool angle controls finish and accuracy. Mixing the two keeps load on the spindle predictable.

GreatLight runs 16 simultaneous 5 axis machining centers, plus 12 four-axis mills, 27 three-axis machines and 16 mill-turn centers. Our standard tolerance is ±0.005 mm (±0.0002 in). Surface finish lands at Ra 0.2–0.8 μm for fine work, Ra 0.8–1.6 μm for high-quality finishes, and Ra 1.6–3.2 μm as machined.

Table sizes cover a wide range. The largest travel is 4,000 × 400 × 150 mm, with a 4,000 mm maximum processing size. Medium machines run 750 × 1,150 × 550 mm and 600 × 600 × 600 mm. Compact machines handle 500 × 500 × 450 mm and 500 × 310 × 200 mm. A Ø400 mm rotary table is available for round and indexed parts.

We inspect 100% of parts before shipment. That covers a raw material check, in-process monitoring, and final inspection. Reports are available on request. The measured qualification rate is 99.99%. If a hole or a contour drifts, we catch it at the machine, not at the customer's dock.

Common materials include aluminum 6061, 7075 and 2024; stainless 303, 316L and 17-4PH; steel 4140 and 4340; titanium Ti-6Al-4V and Inconel; and engineering plastics such as POM, PEEK and PC. Finishing covers anodizing, plating, powder coating, bead blasting and laser marking.

Send a 3D model and a 2D drawing with tolerances and critical features marked. Note any datum callouts, surface finish requirements, and material condition. That is enough for a quotation and a free DFM analysis within 12 hours.

We can start production within 24 hours of approval and ship parts in 3–5 days. There is no minimum order quantity, so a single prototype and a 10,000+ part run both go through the same process. Uploads are kept secure and confidential, and an NDA is available on request.

If you are unsure whether a feature needs five axes, mark it on the drawing and ask. In many cases a short call about tool access saves a redesign later. The earlier we see the geometry, the more freedom we have in the process plan.