Starrag Droop+Rein G/GF Series
Key Specifications
Spindle Power
machine type
variants
spindle torque
number of axes
optional w axis
Overview
The Starrag Droop+Rein G/GF Series is a family of floor-guided gantry-type 5-axis machining centers for very large and bulky workpieces under extreme cutting forces. The G has a moveable cross rail; the GF has a fixed cross rail for maximum rigidity.
Delivers spindle power up to 150 kW with 12,000 Nm torque, matching the T/TF but in a floor-guided gantry configuration. Features wear-free hydrostatic guideways on all linear axes. Optional W-axis converts the cross rail into a continuous positioning axis.
5-axis through C- and B-axis heads with hydraulic or mechanical clamping. Optional auto-changing heads and rotary table for mill-turn. Thermo-symmetric ram with integrated C-axis. Advanced temperature stabilization.
Excels in power generation (turbine casings, reactor vessels), marine propulsion, earth-moving equipment, and defense. New machines: $5,000,000 to $15,000,000+.
Full Specifications
| Parameter | Value |
|---|---|
| Machine Type | Floor-guided gantry, 5-axis |
| Variants | G (moveable cross rail) / GF (fixed) |
| Spindle Motor Power | 150 kW |
| Spindle Torque | Up to 12,000 Nm (8,851 ft-lb) |
| Number Of Axes | 5 (continuous) |
| Optional W Axis | Cross rail as positioning axis |
| Guideway Type | Hydrostatic (wear-free) |
| Ram Design | Thermo-symmetric with integrated C-axis |
| Optional Rotary Table | Mill-turn capable |
| Temperature Stabilization | Advanced thermal management |
| CNC Control | Siemens SINUMERIK 840D sl / SINUMERIK ONE |
| Spindle Torque Max | 12,000 Nm |
Specifications sourced from starrag.com — verified 2026-03-28
Strengths & Limitations
Strengths
- 150 kW / 12,000 Nm for the heaviest roughing operations
- Floor-guided gantry for exceptional stability on very large workpieces
- Hydrostatic guideways eliminate wear and stick-slip
- Optional W-axis adds height flexibility
- Advanced temperature stabilization for multi-shift machining
- Optional mill-turn with rotary table
Limitations
- One of the most expensive machine investments
- Enormous footprint requires purpose-built facilities
- Lead times of 18-30+ months
- Extreme operating costs
Best For
Frequently Asked Questions
01
G has moveable cross rail for height flexibility. GF has fixed cross rail for maximum rigidity.
02
G/GF: floor-guided gantry for the largest workpieces. T/TF: portal, same power. FOGS: overhead gantry, lower max power.
03
Converts cross rail into continuously positionable axis for vertical position adjustment.
04
All metallic materials including heavy steel castings, cast iron, titanium, nickel superalloys, aluminum.
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