Introducing Series X CNC Machining

• 1
  What Series X CNC machining actually changes
• 2
  The hardware behind the process
• 3
  Which parts belong on a 5-axis center
• 4
  Where the process stops paying off
• 5
  Matching the setup to the part

A 3-axis mill moves the tool in X, Y and Z while the part stays still. Reach a side wall and you either refixture the part or add a fourth and fifth rotation. Each refixture adds a datum shift. Stack three setups and the errors add up, even when each one is inside tolerance on its own.

Series X CNC machining puts the two extra rotations under numerical control. The tool tip stays normal to the surface through a continuous path, so a curved pocket, a drafted wall and a bolt circle can come off the same setup. That removes the datum stacking problem rather than chasing it with tighter in-process checks.

The gain is not only angular freedom. Short, stubby tools reach deep features without long gauge length, so chatter drops and the floor finish improves. On our centers we hold ±0.005 mm (±0.0002 in) on position and reach Ra 0.8–1.6 μm as machined where the geometry allows it.

One limit matters from the start. Simultaneous motion is not the same as full access. A deep bore smaller than the tool shank still needs a long tool, and no rotary axis fixes that.

• 1
  Five faces, one setupUndercuts and angled holes open up without a second fixture.
• 2
  Shorter toolsLess deflection, better finish on deep pockets.
• 3
  Fewer datumsPosition error stops stacking across setups.

Our shop runs 127 high-precision CNC machines across three wholly-owned plants covering 7,600 m² in Dongguan, plus a Singapore factory at No.3 Joo Koon Circle. Sixteen of those machines are simultaneous 5-axis centers, which is what we call Series X. Another 12 are four-axis mills, 27 are three-axis, and 16 are mill-turn centers.

Travel decides what fits. Large 5-axis work runs up to 4,000 × 400 × 150 mm. Medium work covers 750 × 1,150 × 550 mm and 600 × 600 × 600 mm. Compact work sits at 500 × 500 × 450 mm and 500 × 310 × 200 mm. A Ø400 mm rotary table handles round parts that need continuous indexing.

The machines are only half the story. Fifteen years of quoting the same families of parts means the process plan, the fixture and the cutter list get built before the first chip. That is where most of the cycle time is won or lost.

Materials run from aluminium 6061-T6, 7075 and ADC12 through stainless 304, 316L, 17-4PH to 4140 steel, TC4 titanium and Inconel. Each one changes the feed and speed window, not the axis count.

• 1
  16 simultaneous 5-axis centersThe core of the Series X capacity.
• 2
  4,000 mm maximum sizeLong parts still fit on the large travel machines.
• 3
  150 techniciansProgrammers, machinists and inspectors in house.

The clearest fit is a part with features on more than three faces that also carries a tight positional callout between those faces. An engine housing with a bored bore and a bolt pattern on the end face is a classic case. So is a bracket where two machined pads must stay parallel within 0.02 mm.

The second fit is geometry a 3-axis machine cannot reach at all: undercuts, swept surfaces, impeller blades, port shapes inside a manifold. If the drawing needs a ball-nose cutter to follow a compound curve, the rotary axes are doing real work.

The third fit is small batch, high mix. No minimum order quantity means a single prototype goes on the same machine as a 10,000-part run. Setup cost is spread differently on 5-axis, so a one-off often prices better than three separate 3-axis setups.

A part does not belong here just because it is complex. If all the features face one direction, a 3-axis machine with a good fixture will be faster and cheaper per part. Complexity alone is not a reason.

• 1
  Multi-face position callsBores and pads that must stay aligned.
• 2
  Swept and undercut formsBlades, ports, drafted walls, compound curves.
• 3
  One-offs and small batchesSetup cost does not scale the same way.

Very deep, small-diameter holes are the first limit. A Ø3 mm hole 90 mm deep needs a tool with high length-to-diameter ratio, and deflection shows up as taper and drift. Rotary axes do not help. Gun drilling or EDM is the honest answer.

Sharp internal corners are the second. A cutter has a radius, so a square internal corner is a drawing error. Ask for the largest corner radius the function allows, or plan for EDM in that corner only.

Mirror finishes across a large free-form surface are the third. Where Series X holds Ra 0.2–0.8 μm on a well-supported face, a thin, unsupported wall will chatter. That is stiffness, not axis count. A hand polish step after machining is often cheaper than chasing the finish in the cut.

Hardened material past roughly 45 HRC is the fourth. Cutting it on a 5-axis center with carbide is slow and hard on the tool. Pre-hardened stock or a grind step usually wins on total cost.

• 1
  Long, thin holesHigh L:D ratio tools deflect regardless of axis count.
• 2
  Square internal cornersCutter radius is a physical limit, not a machine limit.
• 3
  Unsupported thin wallsChatter is a stiffness problem.