USED MAZAK QTU-350M – 1999

The 1999 Mazak QTU-350M is a powerful CNC turn-mill center that combines high-performance turning with live-tool milling capabilities, allowing manufacturers to complete multiple machining operations in a single setup. Manufactured by Yamazaki Mazak, the QTU-350M is part of the highly respected Quick Turn Universal (QTU) Series, a lineup recognized for its rigid construction, reliable Mazatrol controls, and outstanding machining accuracy. The “M” designation indicates the addition of live tooling, enabling milling, drilling, tapping, and cross-hole machining without transferring the workpiece to a separate machining center. This significantly reduces setup time, improves part accuracy, and increases overall shop productivity.

Built with a heavily ribbed slant-bed cast iron structure, the Mazak QTU-350M offers exceptional rigidity and vibration damping for demanding machining applications. The machine features approximately 8.5 inches (215 mm) of X-axis travel and 23.8 inches (605 mm) of Z-axis travel, with a maximum turning diameter of 16.25 inches (410 mm) and a machining length of approximately 13.5 inches (340 mm) on the standard bed configuration. Equipped with a 10-inch hydraulic chuck, 3,500 RPM main spindle, and a 12-position live-tool turret, the QTU-350M efficiently machines steel, stainless steel, aluminum, cast iron, titanium, brass, and engineered plastics. Live tooling supports rotary drilling, tapping, and milling operations at speeds up to 4,500 RPM, allowing complex components to be completed with fewer setups.

The 1999 model is commonly equipped with the Mazatrol Fusion 640T CNC Control, which supports both conversational Mazatrol programming and standard ISO G-code programming. The machine’s servo-driven turret provides fast indexing and high positioning accuracy, making it ideal for production environments requiring repeatability and short cycle times. Standard features typically include hydraulic chucking, programmable tailstock, automatic lubrication, flood coolant system, spindle orientation, and live tooling. Optional equipment such as a chip conveyor, bar feeder, parts catcher, C-axis positioning, and high-pressure coolant further expands the machine’s capabilities.

The Mazak QTU-350M is widely used throughout the aerospace, automotive, oil and gas, hydraulic, agricultural equipment, medical, and general precision manufacturing industries. Typical applications include valve bodies, hydraulic manifolds, pump shafts, couplings, flanges, transmission components, threaded parts, bushings, and precision machined production components. The ability to perform turning and secondary milling operations in one machine improves dimensional accuracy while reducing production costs.

Purchasing a used 1999 Mazak QTU-350M provides manufacturers with premium Japanese turn-mill technology at a significantly lower investment than purchasing new equipment. Mazak machines are renowned for their long service life, exceptional build quality, readily available replacement parts, and dependable machining performance. A properly maintained QTU-350M continues to deliver excellent productivity and precision, making it one of the most desirable used live-tool CNC turning centers available on the market.

MAZAK QTU-350M – 1999 SPECIFICATIONS

Axis

Travels / Work Envelope

Spindle

Live Tool Turret

CNC Control

Coolant / Chip Management

Power Requirements

Dimensions

General Information

HOW MUCH DOES A USED MAZAK QTU-350M – 1999 COST?

A used 1999 Mazak QTU-350M typically sells for $30,000 to $65,000 USD, depending on machine condition, spindle hours, maintenance history, tooling package, CNC control condition, and installed options such as live tooling, C-axis capability, chip conveyor, bar feeder, programmable tailstock, or high-pressure coolant. Machines with documented maintenance records and production-ready tooling generally command higher resale values because they require minimal preparation before entering service.

Before purchasing a used Mazak QTU-350M, buyers should inspect the spindle bearings, live tooling system, C-axis positioning accuracy, turret indexing, guideways, lubrication system, hydraulic chuck, and overall machine geometry. A properly maintained 1999 Mazak QTU-350M provides outstanding long-term value by combining precision turning and milling capabilities in one platform, making it an excellent investment for manufacturers seeking greater flexibility, shorter cycle times, and reliable production performance.

MAZAK QTU-350M VS MAZAK QTU-350MY – WHICH ONE TO BUY?

The Mazak QTU-350M and Mazak QTU-350MY are heavy-duty CNC turning centers designed for manufacturers requiring precision turning, live tooling, and reliable production of medium- to large-sized components. Both machines belong to Mazak’s QUICK TURN UNIVERSAL (QTU) Series and are widely used in the aerospace, oil and gas, automotive, power generation, heavy equipment, and general engineering industries. Both models feature rigid machine construction, high-torque spindle systems, advanced CNC controls, and live tooling capabilities. The primary difference is that the QTU-350MY includes a Y-axis, allowing off-center milling, drilling, tapping, and more complex multi-axis machining, while the QTU-350M is equipped with live tooling but does not include Y-axis movement.

The Mazak QTU-350M is an excellent solution for shops producing shafts, flanges, hydraulic cylinders, valve bodies, pump components, and other turned parts that require milling and drilling on the spindle centerline. It offers excellent productivity while reducing secondary machining operations.

The Mazak QTU-350MY provides additional machining flexibility by allowing offset milling, cross-hole drilling, keyway machining, and complex contouring without moving the workpiece to another machine. This capability significantly reduces setup time and improves overall manufacturing efficiency.

Both machines deliver excellent rigidity, spindle power, and machining accuracy. The QTU-350M is ideal for manufacturers whose work primarily involves turning with live tooling operations, while the QTU-350MY is better suited for shops producing highly complex components requiring Y-axis machining.

For businesses seeking maximum machining flexibility and reduced secondary operations, the Mazak QTU-350MY is generally the better investment. However, the QTU-350M remains an outstanding choice for high-volume precision turning applications.

MAZAK QTU-350M SPINDLE NOT TURNING – CAUSES AND TROUBLESHOOTING

If the spindle on a Mazak QTU-350M does not rotate, the issue may be caused by spindle drive faults, electrical failures, CNC control alarms, hydraulic system problems, lubrication failures, or machine safety interlocks. Proper diagnosis helps minimize downtime and prevents unnecessary component replacement.

Begin by checking the CNC control for active alarms. Emergency stop activation, door interlock faults, spindle drive alarms, servo errors, lubrication warnings, hydraulic pressure alarms, chuck clamping faults, or thermal overload conditions can prevent spindle operation. Resolve all active alarms before restarting the spindle.

Inspect the spindle drive system for electrical problems. Loose wiring, damaged encoder cables, faulty spindle amplifiers, blown fuses, motor overloads, or overheating may prevent spindle rotation. Verify spindle lubrication systems, hydraulic pressure, coolant circulation, compressed air supply, and machine power because these systems directly affect spindle operation.

Review the CNC program and machining setup. Missing M03 or M04 spindle commands, incorrect spindle speed settings, spindle orientation commands, improper chuck clamping, or interrupted machining cycles can prevent spindle startup. Ensure that the machine has completed all required initialization sequences before running the spindle.

If the spindle starts but quickly stops, inspect spindle bearings, chuck condition, hydraulic clamping force, spindle nose cleanliness, tooling condition, and cutting loads. Excessive vibration, abnormal noise, overheating, or poor workholding may indicate mechanical wear or spindle damage.

Regular spindle inspections, lubrication maintenance, hydraulic servicing, and scheduled preventive maintenance significantly reduce unexpected spindle failures and improve machine reliability.

MAZAK QTU-350M MAINTENANCE AND PREVENTIVE CARE GUIDE

The Mazak QTU-350M is designed for demanding production environments where reliability, precision, and long-term machine performance are essential. A structured preventive maintenance program helps maximize spindle life, machining accuracy, and production efficiency.

Daily maintenance should include removing chips from the spindle area, chuck, turret, guideways, enclosure, and chip collection system. Operators should inspect coolant levels, coolant concentration, lubrication systems, hydraulic pressure, compressed air supply, spindle condition, and tooling before beginning production. Keeping the chuck and spindle nose clean helps maintain accurate workholding.

Weekly maintenance should include inspecting coolant pumps, chip conveyors, lubrication units, hydraulic systems, spindle cooling systems, turret indexing mechanisms, live tooling units, chuck clamping operation, and electrical cabinet filters. Chips should be removed from guideways and turret pockets to prevent premature wear.

Monthly inspections should focus on spindle runout, chuck accuracy, turret alignment, live tooling performance, ball screws, linear guideways, spindle bearings, encoder cables, hydraulic lines, electrical connections, lubrication systems, coolant filtration systems, and machine leveling. Machine geometry should also be verified periodically to maintain machining precision.

Additional preventive maintenance includes monitoring spindle vibration, checking axis backlash, replacing worn filters, servicing lubrication systems, inspecting hydraulic components, and maintaining complete maintenance records. Early identification of wear helps reduce repair costs and avoid unexpected downtime.

Consistent preventive maintenance extends spindle life, improves machining quality, and ensures the Mazak QTU-350M continues to deliver dependable production performance for years.

FAQ

What is the Mazak QTU-350M?

The Mazak QTU-350M is a CNC turning center equipped with live tooling for performing turning, drilling, milling, tapping, and other machining operations in a single setup. It is part of Mazak’s QUICK TURN UNIVERSAL Series and is designed for manufacturers requiring high productivity, excellent rigidity, and precision machining of medium- and large-sized components.

The machine is commonly used in aerospace, oil and gas, automotive, power generation, heavy equipment, hydraulic systems, and general manufacturing industries. It is capable of producing shafts, pump components, valve bodies, hydraulic cylinders, flanges, threaded parts, and other precision-machined components while reducing secondary machining operations.

Its combination of powerful spindle performance, live tooling capability, rigid construction, and advanced CNC technology makes the QTU-350M a reliable solution for demanding production applications.

What are the most common problems with the Mazak QTU-350M?

The most common problems with the Mazak QTU-350M include spindle alarms, turret indexing faults, live tooling failures, hydraulic system issues, lubrication warnings, servo drive errors, encoder failures, coolant contamination, chuck clamping problems, spindle orientation faults, electrical communication errors, and axis positioning issues.

Machines operating in continuous production environments may also experience spindle bearing wear, hydraulic pressure fluctuations, turret alignment problems, live tooling wear, thermal expansion, and normal mechanical component fatigue. Poor lubrication, contaminated coolant, worn cutting tools, excessive machining loads, and neglected preventive maintenance can increase the likelihood of these issues.

Regular spindle inspections, lubrication servicing, hydraulic system maintenance, coolant management, live tooling inspections, machine calibration, and scheduled preventive maintenance help minimize downtime and ensure the Mazak QTU-350M maintains its precision, reliability, and production efficiency.