Fanuc Robodrill α-D21LiA5
Key Specifications
X Travel
Y Travel
Z Travel
Max Spindle
Spindle Taper
Tool Capacity
Overview
The Fanuc Robodrill α-D21LiA5 is the 5-axis variant of Fanuc's popular D21L Robodrill platform, integrating a factory-installed DDR (Direct Drive Rotary) tilting rotary table that provides simultaneous 5-axis contouring capability in a compact, fast-cycling package. It targets shops that need legitimate 5-axis capability for complex parts — aerospace structures, medical implants, complex automotive components — but also want the Robodrill's signature cycle time advantages: sub-second tool changes, 54 m/min rapids, and Fanuc-native automation integration.
The D21L body provides 700 x 400 x 330 mm (X x Y x Z) travels — the largest X-travel in the standard Robodrill lineup, providing more room to work with the 5-axis tilting table without the workpiece running into column or table interference limits. The DDR table delivers A-axis tilt from -120° to +30° and full 360° continuous C-axis rotation, both driven by direct-drive motors for fast, backlash-free positioning. Table diameter is approximately 300 mm with a load capacity of 30 kg (66 lb) — sized for the small-to-medium complex parts this machine targets.
The spindle runs at 10,000 RPM standard with a 24,000 RPM high-speed option, all on BT30/BBT30 taper. This is identical to the 3-axis D21MiB5 platform — the 5-axis capability is added by the DDR table, not by changing the spindle system. The Fanuc 31i-A5 control (iA5 generation) manages 5-axis contouring with full simultaneous 5-axis G-code support. The iA5 nomenclature indicates the previous control generation; current production has largely transitioned to iB5, but iA5 units are still found in the used market and some regional configurations.
The D21LiA5 competes with the Brother Speedio W1000Xd1 5-axis and the Mazak VARIAXIS i-300 in the compact simultaneous 5-axis segment. Its strength over these competitors is the Fanuc ecosystem: native Fanuc robot integration, the most universally supported CNC in the industry, and access to Fanuc's ROBODRILL-specific automation packages. New pricing starts around $130,000-$180,000 for the 5-axis configuration.
Full Specifications
| Parameter | Value |
|---|---|
| X-Axis Travel | 700 mm (27.6 in) |
| Y-Axis Travel | 400 mm (15.7 in) |
| Z-Axis Travel | 330 mm (13.0 in) |
| A Axis Range | -120° to +30° (DDR direct-drive) |
| C Axis Range | 360° continuous (DDR direct-drive) |
| Ddr Table Diameter | ~300 mm (11.8 in) |
| Ddr Table Load | 30 kg (66 lb) |
| Max Spindle Speed | 10,000 RPM (24,000 RPM optional) |
| Spindle Taper | BT30 / BBT30 |
| Spindle Motor Power | 11 kW (15 hp) continuous |
| Tool Capacity | 21-position turret |
| Tool To Tool | 0.7 sec |
| Chip To Chip | 1.3 sec |
| Rapid Traverse Rate | 54 m/min (2,126 ipm) |
| Positioning Accuracy | ±0.003 mm |
| Repeatability | ±0.002 mm |
| CNC Control | Fanuc 31i-A5 (iA5 gen) / 31i-B5 on current production |
| Machine Weight | ~4,200 kg (9,259 lb) |
Specifications sourced from emastercam.com — verified 2026-03-28
Strengths & Limitations
Strengths
- Full simultaneous 5-axis contouring in a compact Robodrill footprint — handles complex aerospace, medical, and impeller geometries that require true 5-axis motion
- Direct-drive A and C axes provide fast, backlash-free positioning with no mechanical wear, maintaining 5-axis accuracy over long machine life
- Fanuc 31i control is universally supported by all major CAM systems, eliminating post-processor compatibility issues common with proprietary 5-axis controls
- 700 mm X-travel provides maximum room for the DDR table — reduces interference risks when tilting large fixtures or tall workpieces
- 0.7-second tool-to-tool change and 54 m/min rapids retain the Robodrill's cycle time advantage even in 5-axis applications
Limitations
- 30 kg DDR table load capacity is restrictive — heavy fixtures or large workpieces exceed the limit; shops running 50-100 kg parts need a larger 5-axis platform
- BT30 taper limits cutting force — simultaneous 5-axis roughing in titanium or hardened steel is not this machine's strength; it excels at light-to-medium cuts
- 300 mm DDR table diameter constrains workpiece size; anything requiring a 400+ mm swing needs a larger trunnion table machine
- 21-tool magazine is fixed and cannot be expanded — complex 5-axis parts requiring more than 21 tools need program interruption
Best For
Frequently Asked Questions
01
The 'L' indicates the long-bed version with 700 mm X-travel (vs 500 mm on the M-body). The 'i' is the current-generation Robodrill designation. The 'A5' refers to the Fanuc 31i-A5 control (5th generation A-series). The 'D21' is the legacy model number — not a tool count. So the D21LiA5 is a long-bed, iA5-generation Robodrill with 21-tool turret. Current production has transitioned to iB5 (31i-B5 control) in most configurations.
02
The Makino DA300 is a dedicated 5-axis platform with a 450 mm table, 250 kg load capacity, 60-tool magazine, and 20,000 RPM HSK-A63 spindle — substantially more capable for large 5-axis work. The D21LiA5 is lighter, faster on simple repositioning moves, and significantly less expensive ($130K-$200K vs $400K-$600K for the DA300). Choose the D21LiA5 for small, complex parts where cycle time and automation flexibility matter; choose the DA300 for larger, heavier, or more structurally demanding 5-axis parts.
03
Yes, within limits. The BT30 taper and 30 kg table load restrict you to lighter cuts in titanium — finishing and semi-finishing strategies with smaller tool diameters. For titanium aerospace parts, typical approach is roughing on a more powerful machine and using the D21LiA5 for 5-axis finishing passes. If your titanium work requires aggressive 5-axis roughing, a machine with HSK-A63 or CAT 40 and higher torque is more appropriate.
04
Both. The DDR table is available as a factory-installed option when ordering a new Robodrill, or as a retrofit on an existing D21L-body machine. Factory installation is more cost-effective — typically $40,000-$55,000 as a factory option on a new machine. Retrofit requires servo amplifier additions, control software updates, and mechanical installation, costing $50,000-$65,000 total. Some used Robodrills already have DDR tables installed and represent good value on the used market.
05
The Fanuc 31i-A5 or 31i-B5 control is supported by every major CAM system: Mastercam, Fusion 360, Hypermill, NX, PowerMill, Edgecam, and others all have certified Fanuc 5-axis post-processors. Fanuc's universal adoption means you are unlikely to encounter post-processor compatibility issues, which is a real advantage over proprietary 5-axis controls that may require custom post-processor development.
Videos
FANUC America Corporation
Maruka USA
GENERATION MACHINE TOOLS
Methods Machine Tools, Inc
Liberty Machinery Company
Community Discussions
Owner experience and review — Learning on a Robodrill? : r/Machinists - Reddit
Community discussion — Anyone got a Fanuc Robodrill? I'm trying to set up the ...
Community discussion — Breaking milling tools in robodrill. : r/Machinists - Reddit
Comparison and buying advice — Brother speedio vs fanuc robodrill : r/Machinists - Reddit
Links to community discussions. Summaries are editorial — visit the original thread for full context.
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