Makino G5
Key Specifications
X Travel
Y Travel
Z Travel
Max Spindle
Spindle Taper
Tool Capacity
Overview
The Makino G5 is a 5-axis CNC grinding center that combines precision grinding with the multi-axis flexibility of a machining center, designed for die/mold and precision component applications where complex ground profiles are required. Unlike traditional surface or cylindrical grinders that operate on 2-3 axes, the G5 brings full 5-axis interpolation to the grinding process, enabling complex 3D geometry grinding in a single setup.
Axis travel measures 450 x 350 x 250 mm (17.7 x 13.8 x 9.8 in) on X/Y/Z, with the A-axis tilting and C-axis rotating to present the workpiece to the grinding spindle at any angle. The A-axis provides +30 to -120 degrees of tilt, while the C-axis rotates a full 360 degrees continuously. Both rotary axes use direct-drive motors for fast, accurate positioning without the backlash inherent in worm-gear systems.
The grinding spindle runs up to 50,000 RPM with an HSK-E32 taper, delivering the high surface speeds needed for precision grinding with small-diameter wheels. At these speeds, the G5 can use both conventional and superabrasive (CBN, diamond) grinding wheels. Makino's core-cooled spindle technology maintains thermal stability at sustained high RPMs — critical for the sub-micron accuracy that precision grinding demands.
The machine uses the same rigid construction principles as Makino's milling machines, with a cast-iron base, precision linear guides, and glass scale feedback on all axes. The Pro 6 control includes grinding-specific cycles and in-process wheel dressing capability. Through-spindle coolant delivery puts grinding fluid precisely at the contact zone for consistent material removal and surface finish.
The G5 weighs approximately 6,000 kg (13,228 lb) and features a compact footprint suitable for integration into precision manufacturing cells. It competes with the Haas Multigrind CB and Walter Helitronic Power in the multi-axis grinding segment. New pricing typically ranges from $300,000 to $420,000.
Full Specifications
| Parameter | Value |
|---|---|
| X-Axis Travel | 450 mm (17.7 in) |
| Y-Axis Travel | 350 mm (13.8 in) |
| Z-Axis Travel | 250 mm (9.8 in) |
| A Axis Range | +30° to -120° (150° total) |
| C Axis Range | 360° (continuous) |
| Max Spindle Speed | 50,000 RPM |
| Spindle Taper | HSK-E32 |
| Spindle Motor Power | 7.5 kW (10 hp) |
| Table Size | 300 x 250 mm (11.8 x 9.8 in) |
| Table Load Capacity | 50 kg (110 lb) |
| Rotary Drive | Direct drive (A and C axes) |
| Positioning Accuracy | +/-0.001 mm |
| Rapid Traverse Rate | 1,890 ipm |
| Machine Weight | ~6,000 kg (13,228 lb) |
| CNC Control | Makino Professional 6 (Pro 6) |
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| Metric | English |
| Pallet | 9.8" |
| A Axis | None |
| B Axis | 270° (-90°to +180°) |
| C Axis | 360° |
| Spindle Rpm | 12,000 rpm |
| Cutting Feedrate | 1,890 ipm |
| Maximum Workpiece | 17.3 Ø x 15 SR |
| Maximum Payload | 265 lbs |
| Tool Capacity | 60 tools |
| Maximum Tool Length | 14.2" |
| Maximum Tool Length Hsk | 15.7" |
| Maximum Tool Diameter | 2.8"/ 8.7" * * with limitation |
| Maximum Tool Weight | 26 lbs |
Specifications sourced from makino.com — verified 2026-03-28
Strengths & Limitations
Strengths
- Full 5-axis interpolation brings complex 3D profile grinding to a single setup, eliminating multiple fixturing operations on conventional grinders
- 50,000 RPM spindle enables precision grinding with small-diameter wheels and superabrasive (CBN, diamond) technology
- Direct-drive rotary axes provide fast, backlash-free positioning for consistent accuracy across complex multi-angle grinding operations
- Sub-micron positioning accuracy (+/-0.001 mm) meets the tightest tolerance requirements for precision tooling and components
- Core-cooled spindle technology maintains thermal stability at sustained high RPMs during long grinding cycles
- Pro 6 control with grinding-specific cycles simplifies programming of complex ground profiles and in-process wheel dressing
Limitations
- 50 kg table load capacity severely limits workpiece size and weight — this is a precision instrument, not a production grinder
- 7.5 kW spindle power restricts material removal rate for roughing operations compared to dedicated surface grinders
- Premium pricing ($300K-$420K) places the G5 in high-end capital equipment territory requiring strong ROI justification
- HSK-E32 taper limits wheel arbor size, restricting the maximum grinding wheel diameter that can be mounted
- Requires climate-controlled environment to achieve rated positioning accuracy consistently
- Programming complex 5-axis grinding operations requires specialized CAM software and skilled operators
Best For
Frequently Asked Questions
01
New G5 machines typically price between $300,000 and $420,000 depending on configuration, tooling packages, and automation options. The 50K RPM spindle, direct-drive rotary axes, and precision construction account for the premium pricing. Used G5 machines are rare on the secondary market due to low production volumes.
02
While 5-axis machining centers can mount grinding wheels, they lack the G5's grinding-specific features: 50K RPM spindle for optimal wheel speeds, in-process wheel dressing, grinding-specific control cycles, and the thermal management needed for consistent sub-micron accuracy during grinding. The G5 is purpose-built for grinding, not adapted from a milling platform.
03
The G5 accommodates conventional (aluminum oxide, silicon carbide) and superabrasive (CBN, diamond) grinding wheels on HSK-E32 arbors. The 50K RPM spindle is especially effective with small-diameter superabrasive wheels where high surface speeds are needed for efficient grinding. Wheel selection depends on workpiece material, required surface finish, and material removal rate requirements.
04
The G7 is a larger machine with more travel (600 x 450 x 350 mm vs 450 x 350 x 250 mm), a bigger table (400 x 350 mm vs 300 x 250 mm), higher table capacity (100 kg vs 50 kg), and more spindle power (11 kW vs 7.5 kW). The G7 handles larger components while maintaining the same precision capability. Choose the G5 for smaller precision components; choose the G7 when your workpieces exceed the G5's envelope.
05
Yes, the G5's HSK-E32 spindle can accept milling tools for light machining operations in addition to grinding. This enables complete processing of some parts — milling features and grinding surfaces on a single machine. However, the 7.5 kW spindle power and 50 kg table limit restrict milling to light cuts. For serious milling and grinding on the same machine, Makino's larger platforms are more appropriate.
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