Makino G7
Key Specifications
X Travel
Y Travel
Z Travel
Max Spindle
Spindle Taper
Tool Capacity
Overview
The Makino G7 is the larger platform in Makino's 5-axis CNC grinding center lineup, extending the G5's precision grinding concept to handle bigger workpieces with more power. It targets die/mold shops, cutting tool manufacturers, and precision component producers who need complex multi-axis grinding capability on parts that exceed the compact G5's envelope.
Axis travel measures 600 x 450 x 350 mm (23.6 x 17.7 x 13.8 in) on X/Y/Z — a 33% increase in travel volume over the G5 that opens up medium-sized component grinding. The A-axis tilts +30 to -120 degrees and the C-axis rotates 360 degrees continuously, both using direct-drive motors for backlash-free positioning. The 400 x 350 mm (15.7 x 13.8 in) worktable handles workpieces up to 100 kg (220 lb), doubling the G5's capacity.
The grinding spindle runs up to 45,000 RPM with an HSK-E40 taper, delivering 11 kW (14.8 hp). The slightly lower top speed compared to the G5's 50K RPM is offset by the larger HSK-E40 taper that accommodates bigger grinding wheel arbors and provides more rigidity for heavier grinding operations. The increased 11 kW power rating supports more aggressive material removal during roughing passes.
The machine shares the same rigid cast-iron construction, precision linear guides, and glass scale feedback as the G5. The Pro 6 control includes grinding-specific cycles, in-process wheel dressing, and the ability to combine grinding and light milling operations in a single program. Through-spindle coolant delivery ensures precise grinding fluid placement at the wheel-workpiece interface.
At approximately 8,500 kg (18,739 lb), the G7 carries more thermal mass than the G5, contributing to dimensional stability during long grinding cycles. It competes with the Walter Helitronic Vision 400, Anca MX7, and Rollomatic GrindSmart 830XW in the multi-axis precision grinding segment. New pricing typically ranges from $380,000 to $520,000.
Full Specifications
| Parameter | Value |
|---|---|
| X-Axis Travel | 600 mm (23.6 in) |
| Y-Axis Travel | 450 mm (17.7 in) |
| Z-Axis Travel | 350 mm (13.8 in) |
| A Axis Range | +30° to -120° (150° total) |
| C Axis Range | 360° (continuous) |
| Max Spindle Speed | 45,000 RPM |
| Spindle Taper | HSK-E40 |
| Spindle Motor Power | 11 kW (14.8 hp) |
| Table Size | 400 x 350 mm (15.7 x 13.8 in) |
| Table Load Capacity | 100 kg (220 lb) |
| Rotary Drive | Direct drive (A and C axes) |
| Positioning Accuracy | +/-0.001 mm |
| Rapid Traverse Rate | 1,890 ipm (X,Y) & 1,693 ipm (Z) |
| Machine Weight | ~8,500 kg (18,739 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 (X,Y) & 1,693 ipm (Z) |
| Maximum Workpiece | 21 Ø x 15.7 SR |
| Maximum Payload | 265 lbs |
| Tool Capacity | 60 tools |
| Maximum Tool Length | 14.2" |
| Maximum Tool Length Hsk | 16.5" |
| 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
- Larger travel (600 x 450 mm) and 100 kg table capacity handle medium-sized components that exceed the G5's compact envelope
- HSK-E40 taper accommodates larger grinding wheel arbors for more aggressive material removal and broader wheel selection
- 11 kW spindle power supports productive roughing passes in addition to precision finishing, reducing total cycle times
- Direct-drive rotary axes maintain backlash-free sub-micron positioning for complex multi-angle ground profiles
- Greater thermal mass (8,500 kg) improves dimensional stability during extended grinding cycles
- Pro 6 control with grinding-specific cycles and in-process dressing enables complete part processing in a single setup
- Combined grinding and light milling capability eliminates part transfers between machines for some applications
Limitations
- Premium pricing ($380K-$520K) is among the highest in the multi-axis grinding segment, requiring strong business case justification
- 100 kg table load capacity, while double the G5's, still limits the machine to small-to-medium precision components
- 45,000 RPM is slightly slower than the G5's 50K RPM, which can affect grinding efficiency with the smallest wheel diameters
- Larger footprint and 8,500 kg weight require more floor space and installation investment than the compact G5
- 5-axis grinding programming requires specialized CAM software and highly skilled operators
- Climate-controlled environment essential for achieving rated sub-micron accuracy specifications
Best For
Frequently Asked Questions
01
New G7 machines typically price between $380,000 and $520,000 depending on configuration, tooling packages, and automation options. The G7 commands approximately $80,000-$100,000 more than the G5 due to the larger platform, more powerful spindle, and increased table capacity. Used G7 machines are extremely rare on the secondary market.
02
The G7 offers 33% more travel volume (600x450x350 vs 450x350x250 mm), double the table capacity (100 vs 50 kg), more spindle power (11 vs 7.5 kW), and a larger HSK-E40 taper (vs HSK-E32). The G5 has a slightly higher spindle speed (50K vs 45K RPM) and a more compact footprint. Choose the G5 for smaller precision components where its envelope is sufficient; choose the G7 when workpieces exceed the G5's travel or weight limits.
03
For precision surface grinding of complex parts, yes. The G7's 5-axis capability and sub-micron accuracy handle surface grinding operations that traditional surface grinders perform, plus complex profile and contour grinding that conventional machines cannot. However, for simple flat surface grinding of large workpieces, a dedicated surface grinder with a bigger table and higher power is more cost-effective. The G7's value is in complex geometry grinding.
04
The G7 accepts conventional (aluminum oxide, silicon carbide) and superabrasive (CBN, diamond) wheels on HSK-E40 arbors. The larger E40 taper accommodates bigger wheel assemblies than the G5's E32, supporting wider wheels for higher material removal rates. The 45K RPM spindle optimizes surface speed across a range of wheel diameters from small profile wheels to medium-diameter surface grinding wheels.
05
The G7 handles both production and prototyping. The automatic wheel changer, in-process dressing, and Pro 6 control with grinding cycles support repeatable production runs. The 5-axis flexibility also makes it excellent for prototype and low-volume work where dedicated fixtures and setups for conventional grinders are not cost-justified. Many shops use the G7 for both production grinding of complex components and R&D prototyping.
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