Next Shift

Hybrid CNC: The Machine That Prints Metal, Then Cuts It

For as long as there have been machine tools, the job has been taking metal away. A hybrid machine does the opposite first. It lays metal down where the part needs it, then picks up a cutting tool and finishes the job in the same setup.

Adding Before Cutting

Every machine on a shop floor is subtractive. You start with more metal than you need and cut away the rest. 3D printing flipped that, building a part up layer by layer, but most metal printers are separate machines that make rough parts someone still has to finish.

A hybrid machine puts both in one envelope. It has a normal milling spindle and a metal deposition head, and it switches between them on its own. The part never leaves the fixture, so the machine that added the metal knows exactly where it put it when it starts cutting.

How the Metal Goes On

The process the big builders use is laser metal deposition, also called directed energy deposition. A nozzle feeds metal powder into the focus of a laser, the powder melts on contact, and the molten metal fuses to the part as a bead. Bead by bead and layer by layer, the machine builds up the shape.

DMG MORI's description of its own machine covers the details. A coaxial stream of inert gas keeps the melt from oxidizing, the laser head locks into the milling spindle's HSK toolholder when it is working and parks in a docking station during milling, and the switch between the two is automatic. Its 2015 release gave bead widths of 1.6 or 3 mm, depending on the nozzle.

Here's the part most machinists never think about: the deposition head is just another tool. On Mazak's machine, the cladding heads sit in the tool magazine and the standard tool changer loads them, according to Mazak. To the machine, adding metal is a tool change.

Three Builders, Three Machines

All three started with a machine the builder already made. Yamazaki Mazak built its hybrid on the INTEGREX mill-turn, DMG MORI on a 5-axis mill and Okuma on its MU-V 5-axis and MULTUS lines. Our Next Shift on Done In One covers why finishing a part in one setup matters. A hybrid takes that idea one step further back, to before the metal exists.

What It Is Actually For

The builders do not pitch hybrid as a faster way to make every part. Their own releases point to three jobs:

Repair. Mazak names repairing worn or damaged parts, such as aerospace turbine blades, as a key use. Instead of scrapping an expensive part, you add metal back where it wore and machine it to size.

Cladding. DMG MORI lists corrosion-resistant coatings on pipes, fittings and flanges for the energy and oil industries, and coatings for mold making. A part made from an inexpensive steel gets a skin of a tougher alloy only where it needs one.

Near-net features. Mazak says its machine can build near-net-shape features. Rather than cutting a flange out of a big block, you grow it onto a smaller one and cut far less metal away.

Speed is part of the case, with a caveat. DMG MORI said in 2015 that its machine deposited up to 1 kg of metal per hour and ran up to 10 times faster than building a part in a powder bed. That is the builder's number, and deposited metal comes out rough, which is exactly why a spindle is waiting beside the nozzle.

Retrofit, Not Just Replace

Hybrid does not only come as a new machine. Hybrid Manufacturing Technologies sells AMBIT deposition heads that change in and out like a tool, and it markets them as a retrofit for existing CNC machines as well as for new ones. The system won the inaugural International Additive Manufacturing Award in 2015, a $100,000 prize sponsored by AMT and Germany's VDW.

The company has kept adding heads. In 2023 it introduced the AMBIT Flex 22i, an internal cladding head built to reach into openings under 2 inches in diameter, aimed at moldmakers who need metal added inside a cavity.

Our read: a retrofit is not a bolt-on afternoon. Laser deposition brings laser safety, metal powder handling and shielding gas into a machine that was built for coolant and chips. But it means the question for a shop is not only which new hybrid to buy. It can also be which rigid, accurate machine you already have.

What It Means for a Used Machine

Every hybrid machine is still a CNC machine first. The deposited metal has to be machined to size, so the accuracy, rigidity and control of the base machine decide the quality of the finished part. That is the same list a buyer checks on any used machine.

For most shops, the near-term change is in the work, not the floor. Repair, cladding and near-net parts will increasingly come in from customers who have a hybrid machine or a deposition service, and they still need conventional machines to rough, finish and inspect. A good used vertical is part of that chain.

The Next Shift

Machining has always been about taking metal away. Hybrid machines do not change that. They change where the metal comes from. The next time a worn part comes in, the question may not be whether to scrap it, but how much metal to put back.

Resell CNC Take

Hybrid is not the end of subtractive machining. It is a new reason to need it. Every gram of deposited metal still has to be cut to size by a spindle on a rigid, accurate machine, and that is what we sell.

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