Multi-tasking China CNC Machining

Multi-tasking versus separate operations — the completeness trade-off

Multi-tasking machining is the process that completes a part in one machine that would otherwise move between two or three, and the trade-off is between the hourly rate of a multi-tasking machine and the cumulative setup and handling cost of the separate operations. A part with a turned bore, a milled flat, a cross-hole, and a back-face feature is a multi-tasking candidate: on separate machines, the part moves from turning to milling to drilling, each move a re-fixture and a datum transfer; on a multi-tasking machine, the part runs complete in one chucking.

The completeness is not just a setup saving; it is a tolerance saving. Every re-fixture between machines transfers the datum, and the datum transfer is where the positional tolerance across features opens up. A bore turned on one machine and a cross-hole milled on another has a positional tolerance that is the sum of the two setups' accuracy; a bore and a cross-hole completed on one multi-tasking machine has a positional tolerance that is the accuracy of the one setup. For parts where the positional relationship between turned and milled features is the functional relationship — a valve body, a pump housing, a gearbox component — the single-setup completeness is the right routing.

The economic crossover is the setup cost. On a prototype or low-volume run, the multi-tasking machine's higher hourly rate is offset by the single setup and single first-article; on a high-volume run, the separate operations on simpler, cheaper machines may win because the setup amortises across the volume. The facility behind this guide runs multi-tasking on a Mazak INTEGREX I-250H S with sub-spindle and B-axis, alongside CNC turning and 3/4/5-axis milling on a 100+ machine floor, so the routing is quoted on the geometry and the volume, not on whichever machine is free.

your move is to ask, at the quote stage, whether the part runs complete on one machine or across separate operations, and to ask for the setup count and the first-article count in the quote. A part that runs complete has one first-article; a part that moves between three machines has three. The Hexagon CMM verification reports the positional result across the turned and milled features, with ±0.003 mm milling and ±0.002 mm turning bands, Ppk ≥ 1.67 initial and Cpk ≥ 1.33 in production, under ISO 9001:2015, IATF 16949:2016, and ISO 14001:2015. Send the drawing to [email protected] or call +86 13126536955, and ask for the routing decision in writing.

The shop behind this multi-tasking guide — single-setup completeness on demand

Backing this guide is a 6,800 m² plant at No. 8, Shuibian Songyuan Road, Hengli Town, Dongguan, Guangdong, China 523470, running 100+ CNC machines — Mazak VARIAXIS I-600 and INTEGREX I-250H S, TSUGAMI B0206-III/B0205-III, STAR SR-32JII / SR-32J Type N, Citizen Cincom A20-3F7 — plus 3-, 4- and 5-axis milling and turning, 5+ wire EDM and a Hexagon CMM bench with 20+ gauges.

Milling holds ±0.003 mm, turning ±0.002 mm, and grinding or wire EDM ±0.002 mm, all checked on a Hexagon CMM with the 10:1 gauge rule applied to every feature. Capability: Ppk ≥ 1.67 initial and Cpk ≥ 1.33 in production on key characteristics. Certified to ISO 9001:2015 (116024/A/0001/UK/En), IATF 16949:2016 (131941/A/0001/SM/En, design clause 8.3 excluded, openly disclosed) and ISO 14001:2015 (116024/B/0001/UK/En), held by Dongguan Zhuohang Ltd, USCC 91441900MA4UWT6X39, established 2005. Customers across Austria, Belgium, the Czech Republic, Denmark, France, Germany, Greece, Hungary, Ireland, Italy, the Netherlands, Spain, Sweden and the United Kingdom in Europe; Brazil, Canada, Mexico and the United States in the Americas; China, Israel, Japan, Singapore and Sri Lanka in Asia; Australia and New Zealand in Oceania; and South Africa in Africa are supplied from China, worldwide. Contact Felipe Iglesias at [email protected] or +86 13126536955 to begin the quote, and ask for the certificate numbers, the machine list and a past CMM report together.

What multi-tasking changes about the process

Multi-tasking is a single machine that performs turning, milling, drilling, and often grinding or gear cutting in one setup.

The economics are counter-intuitive: the hourly rate is the highest on the floor, yet the total cost on a complex part is often the lowest, because the machine removes the queues between operations. A part that would spend nine days moving through five departments spends one day in one machine.

What multi-tasking is genuinely good for

Complex, high-value parts where the geometric relationship between turned and milled features is the critical requirement.

High rate, low total cost on the right part. On a simple part it is the wrong tool.

Where does multi-tasking stop paying?

A multi-tasking machine is a single point of failure for that part. Deep capability in the same family, not one hero machine — is what protects the schedule.

This boundary is stated deliberately. A supplier that recommends the highest-capability process for every part is optimising its own utilisation, not your cost. And the tell is a quote that never suggests simplifying the design.

How is the toolpath verified before it touches material?

Every programme is simulated offline before it reaches a machine: tool and holder collision, axis limits, and material removal against the stock model. On five-axis and mill-turn work this is not optional — the number of possible collision cases grows with each rotary axis, and a crash on a part that has already absorbed eight hours of cycle time is the expensive kind.

The verification step belongs in the quote. It is real engineering time, and a supplier that omits it is either simulating badly or not simulating at all.

How do you verify a supplier really has this capability?

Ask how many machines of this type are on the floor. Multi-tasking concentrates a part into one machine, which is efficient and also creates a single point of failure. Depth in the family is what makes the concentration safe.

None of these questions are hostile and all of them are cheap. A plant with the capability answers them easily; a brochure cannot.

Where the money is actually decided

The parts that suit multi-tasking best are the ones where the cost is currently in the handoffs, several operations, several fixtures, several queues. Consolidating them into one setup removes the queues and the datum transfers at once. The design implication is to keep the critical relationships internal to the part rather than dependent on a fixture.

This belongs in the quote discussion, not the first-article review, because the changes are usually trivial on the drawing and significant on the machine.

What tolerance applies?

±0.003 mm on CNC milling, ±0.002 mm on CNC turning; ±0.002 mm where precision grinding or wire EDM is used, fixed for each feature at the quote.

What identifies the legal entity behind the machines?

Legally this is Dongguan Zhuohang Ltd, established 2005, Social Credit Code 91441900MA4UWT6X39, operating under the name Zhuohang Precision Machining Factory from No. 8, Shuibian Songyuan Road, Hengli Town, Dongguan, Guangdong, China 523470.

The 18-character code, checked against the National Enterprise Credit Information Publicity System, confirms a real manufacturer. A trading company may hold a business licence as well, but its scope is trading, not manufacturing, and its address is an office rather than a plant.

How much of the floor is in this family?

Total machine count is not the question — the question is how many machines sit in the family that makes your part, because that is the queue your part waits in. The floor runs more than 100 machines: 50+ three-axis centres for prismatic work, 20+ four-axis, 20+ five-axis, 25+ turning and mill-turn centres, Swiss-type lathes for long slender parts, precision grinding and wire EDM for the tightest features.

Depth in the same family is what lets a part shift lanes instead of waiting in a queue when a machine is pulled for service. That, not the headline machine, is what protects a delivery date.

What is the certification position?

ISO 9001:2015, IATF 16949:2016 (excluding clause 8.3 product design), and ISO 14001:2015. Each with a certificate number verifiable with the registrar.

What this shop actually runs

Capability evidence should come as specifics, not slogans. Behind this guide is a 6,800 m2 plant in Dongguan, China running 100+ CNC machines with 100+ staff. The machine list by category:

• 5-axis machining centres (10+) - Mazak VARIAXIS I-600 (510/910/510 mm travel, 12,000 rpm, 22 kW, 71.6 N·m, 30-tool BT40) and Mazak INTEGREX I-250H S (B-axis 0.0001°, 24 kW, 124 N·m, 38-tool HSK-A63). Made for compound-angle parts, single-setup multi-face prismatic work, and aerospace fittings where datum transfer loss is unacceptable.
• 3-axis / 4-axis machining centres (50+) - Brother SPEEDIO S500Z2N / S700Z2N (10,000 rpm, 14/21-tool ATC, 0.7 s tool-to-tool, Z-axis 2.2 G) and Mazak VCE-430A L / VCE-570C L (10,000 rpm, 118 N·m, 24-tool ATC). Made for prismatic parts, plates, brackets, housings.
• Swiss-type turning centres (10+) - Citizen Cincom A20-3F7 (Φ20 mm, 10,000 rpm), TSUGAMI B0206-III / B0205-III (Φ20 mm, 0.1 µm), STAR SR-32JII / SR-32J Type N (Φ32 mm, 8,000 rpm). Made for long, slender rotational parts at ±0.002 mm.
• CNC turning centres (20+) - HEADMAN T70M/1250 (720 mm swing, 117 mm bore, 3,000 rpm, BMT75 12-station turret). Made for shafts, bushings, flanges up to ±0.002 mm.
• Wire EDM (5+) - Sodick AQ535L (550/350/300 mm travel, ±20° taper, 800 kg workpiece). Made for hardened tool steel, internal splines, sharp internal corners that milling cannot reach.
• Inspection: Hexagon CMM + 20+ gauges - Hexagon CMM for coordinate measurement, plus vision system, profilometer, hardness tester, coating thickness gauge, XRF for material verification. The 10:1 rule (gauge 10x more accurate than the band) is applied to every feature.
• Machine highlights - VARIAXIS I-600: one-setup multi-face 5-axis + MAZA-CHECK auto-calibration; INTEGREX I-250H S: DONE-IN-ONE mill-turn, B-axis 0.0001° + Ai thermal shield; SPEEDIO S500Z2N / S700Z2N: Z-axis 2.2 G + 0.7 s ATC; Swiss-type: guide-bush switchable + 0.1 µm resolution.

Tolerance: ±0.003 mm CNC milling / ±0.002 mm CNC turning / ±0.002 mm grinding and wire EDM. Capability: Ppk >= 1.67 initial on key characteristics, Cpk >= 1.33 ongoing.

Certificates: ISO 9001:2015 (116024/A/0001/UK/En), IATF 16949:2016 (131941/A/0001/SM/En, with design clause 8.3 excluded, stated openly) and ISO 14001:2015 (116024/B/0001/UK/En), issued to Dongguan Zhuohang Ltd, registration 91441900MA4UWT6X39, founded 2005.

Where we ship: Austria, Belgium, the Czech Republic, Denmark, France, Germany, Greece, Hungary, Ireland, Italy, the Netherlands, Spain, Sweden and the United Kingdom in Europe; Brazil, Canada, Mexico and the United States in the Americas; China, Israel, Japan, Singapore and Sri Lanka in Asia; Australia and New Zealand in Oceania; and South Africa in Africa — plus other countries and regions worldwide, shipped from our base in Dongguan, China.

Contact: Felipe Iglesias, [email protected], +86 13126536955.

Frequently Asked Questions

Standards referenced on this page

• ASTM A582/A582M-12 — Standard Specification for Free-Machining Stainless Steel Bars
• ASTM B348/B348M-21 — Standard Specification for Titanium and Titanium Alloy Bars and Billets
• ISO 9001 — Quality management systems — Requirements