Multi-operation machines

What is a multi-operation machine?

A multi-operation machine (often called a multi-op or machining center) is a CNC machine with automatic tool changing that performs multiple machining operations—milling, drilling, tapping, reaming — without the workpiece needing to be moved or re-clamped. Modern multi-operation machines have three to five controlled axes and tool magazines with 30 to over 100 positions. The most advanced models, such as Grob’s T-series, also incorporate turning capabilities within the same machine, allowing a complete part to be finished in a single setup.

Advantages of multi-operation machines

Fewer tensioning operations

Every time a part is re-clamped between machines, there is a risk of measurement deviations. A multi-operation machine eliminates these re-clamping steps by performing all operations in a single setup. The result is tighter tolerances and less scrap—critical in industries such as aerospace, medical technology, and automotive.

Shorter setup times

Automatic tool changing and 5-axis positioning allow the machine to switch between milling, drilling, and threading in seconds rather than minutes. With Grob’s tunnel concept and horizontal spindle position, chips fall freely, reducing downtime for cleaning and increasing machine utilization.

Greater precision

When the entire part is machined in a single setup, the cumulative error margin that occurs with multiple setups is avoided. Nakamura-Tome’s NT Thermo Navigator AI also compensates for thermal expansion in real time, keeping tolerances stable throughout the shift—even during unmanned operation.

Types of multi-operation machines we offer

Vertical multi-operation machines

Vertical machining centers feature a downward-facing spindle and are suitable for flat or medium-sized workpieces such as plates, covers, and fixtures. They are cost-effective and easy for the operator to access. Nakamura-Tome’s multitasking machines with a vertical configuration, such as MX-100, combines turning and milling in a compact design.

Horizontal multi-operation machines

With the spindle in a horizontal position, chips fall freely out of the work area, which improves process reliability during long runs and unmanned operation. Grob’s unique tunnel design maximizes the Z-axis travel and makes it possible to machine large components without the risk of collision. Grob G550T and G750T are horizontal 5-axis machining centers designed for demanding production.

5-axis multi-operation machines

Five controlled axes (three linear + two rotary) allow the tool to access the workpiece from virtually any angle. This means that complex geometries—such as turbine blades, implants, and aerospace components—can be machined in a single setup. Grob G350T With a 230-degree swivel range on the A-axis and 360 degrees on the B-axis, it is designed specifically for this type of multi-operation machining, with TRAORI turning available as an option.

Frequently Asked Questions About Multi-Operation Machines

What is the difference between a multi-operation machine and a CNC milling machine?

A CNC milling machine primarily performs milling operations in three axes. A multi-tasking machine features automatic tool changing and typically has four or five axes, which allows it to also drill, tap, ream, and in some cases turn—all in a single setup. Multi-operation machines often have larger tool magazines and are designed for complete machining, whereas a CNC milling machine is optimized for simpler milling tasks with shorter setup times.

How many axes does a multi-operation machine have?

Most multi-axis machines have three, four, or five controlled axes. Three axes (X, Y, Z) are sufficient for basic machining. Four axes add rotation around an axis for indexing. Five axes—as found in all our Grob models—enable full simultaneous machining from any angle, which is required for complex geometries in aerospace and medical technology.

What brands of multi-purpose machines do you sell?

We represent Coarse (German 5-axis machining centers with a tunnel design, models G350T, G550T, and G750T) and Nakamura-Tome (Japanese multitasking machines that combine turning and milling, including the JX-200, JX-250, MX-100, NTRX-300, and NTJ series). Together, they cover everything from compact parts to large workpieces up to 1,650 mm.

Can a multi-operation machine replace several machines?

Yes. A modern multi-purpose machine can replace a separate CNC lathe, milling machine, and drilling machine by performing all operations in a single setup. For example, Grobs’ G550T combines 5-axis milling with TRAORI turning. Nakamura-Tome’s JX-250 handles turning and milling of parts up to 1,650 mm. The benefits include fewer machines, reduced floor space, lower labor costs, and the elimination of measurement deviations between sets.