Mazak QT-Ez 12MY
Key Specifications
Max Spindle
Spindle Taper
Tool Capacity
Weight
Rapid Traverse
Spindle Power
Overview
The Mazak QT-Ez 12MY adds Y-axis off-center milling capability to the 12-inch QT-Ez platform, providing full mill-turn versatility for larger workpieces at a value price point. The MY configuration is ideal for shops producing parts in the 12-inch chuck range that require milled features beyond what C-axis interpolation alone can accomplish.
The QT-Ez 12MY runs a 305 mm (12 in) chuck with a maximum turning diameter of 343 mm (13.5 in) and a maximum turning length of 539 mm (21.22 in). The built-in motor spindle delivers 22 kW (30 hp) at up to 3,500 RPM through an A2-8 spindle nose. Bar capacity is 80 mm (3.15 in) for production bar feeding. The Y-axis provides approximately 100 mm of travel for off-center drilling, milling, and contouring.
The 12-position turret with BMT 55 tooling runs live tools at 6,000 RPM. C-axis resolution of 0.0001 degrees combined with Y-axis travel enables complex milled features including flats, hexes, keyways, off-center holes, and contoured pockets on larger workpieces. The BMT 55 rigidity is particularly important on 12-inch machines where workpiece mass and cutting forces are higher.
MAZATROL SmoothEz manages the 4-axis (X, Y, Z, C) programming on a 15-inch touchscreen. The conversational Y-axis programming simplifies operations for shops transitioning from simpler machines without requiring dedicated CAM software for most applications.
The QT-Ez 12MY competes with the Haas ST-30Y, Doosan Puma 3100MY, and Okuma LB4000 EX II MY. It fills the gap between the more affordable QT-Ez 12M (no Y-axis) and the premium Quick Turn 350MY. For shops that need Y-axis capability on larger parts, the QT-Ez 12MY provides Mazak motor spindle quality at competitive pricing. Specs sourced from Mazak Corporation published data.
Full Specifications
| Parameter | Value |
|---|---|
| Chuck Size | 12" |
| Max Turning Diameter | 343 mm (13.5 in) |
| Max Turning Length | 539 mm (21.22 in) |
| Max Spindle Speed | 3,500 RPM |
| Spindle Motor Power | 22 kW (30 hp) |
| Spindle Taper | A2-8 |
| Bar Capacity | 80 mm (3.15 in) |
| Tool Capacity | 12-position turret |
| Turret Tooling | BMT 55 |
| Live Tool Speed | 6,000 RPM |
| C Axis Resolution | 0.0001 degrees |
| Y Axis Travel | 100 mm (3.94 in) |
| X Axis Travel | 220 mm (8.66 in) |
| Z Axis Travel | 596 mm (23.47 in) |
| Rapid Traverse Rate | 30 m/min X, 30 m/min Z |
| Machine Weight | 4,900 kg (10,803 lb) |
| CNC Control | MAZATROL SmoothEz |
| Max Machining Diameter | Φ13.5″ |
| Max Machining Length | 21.22″ |
Specifications sourced from mazak.com — verified 2026-03-28
Strengths & Limitations
Strengths
- Y-axis enables off-center milling and contouring on larger 12-inch chuck workpieces
- 22 kW built-in motor spindle handles aggressive stock removal on bigger parts
- BMT 55 turret rigidity supports meaningful milling on heavier workpieces
- 80 mm bar capacity for production bar feeding of 3-inch stock with Y-axis milling
- MAZATROL SmoothEz simplifies Y-axis programming with conversational interface
- Value-priced alternative to the Quick Turn 350MY for most 12-inch mill-turn applications
Limitations
- No sub-spindle for done-in-one processing; backworking requires part flip
- 3,500 RPM max spindle speed limits surface speed on smaller diameter features
- SmoothEz lacks some advanced SmoothG features for complex multi-axis work
- Max turning diameter reduced to 343 mm with milling turret clearance
Best For
Frequently Asked Questions
01
New pricing runs $115,000-$170,000 depending on options. The Y-axis adds roughly $20,000 over the equivalent QT-Ez 12M.
02
The Quick Turn 350MY offers SmoothG control, more rigidity, and larger turning envelope. The QT-Ez 12MY saves $40,000-$60,000 while covering most 12-inch MY applications.
03
It handles cross-drilling, tapping, flat milling, and moderate contouring well. For heavy milling comparable to a machining center, consider a dedicated mill-turn machine.
04
No. The MSY configuration must be ordered from the factory. If backworking is needed, purchase the QT-Ez 12MSY from the start.
Videos
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