FANUC Robodrill α-D21SiB Plus
Key Specifications
X Travel
Y Travel
Z Travel
Max Spindle
Tool Capacity
Table Size
How much does the FANUC Robodrill α-D21SiB Plus cost?
Estimated price range
Our best estimate for a vertical machining centers (vmc) in this class — not a quote from FANUC. Configuration moves it a long way.
Overview
With 21 tools on a machine that has only 300 mm (11.8 in) of X travel, the FANUC Robodrill α-D21SiB Plus is set up for small parts with long tool lists. It is a 3-axis vertical machining center on the Series 31i-B Plus control, with 330 mm (13 in) of Z, a 500 x 300 mm (19.7 x 11.8 in) table and a table load of 100 kg (220 lb).
Tool count is the reason to choose it over the Robodrill α-D14SiB, which shares every other listed row and carries 14 tools. A larger changer earns its place in two situations. One is a part with many hole sizes, threads and chamfers, where each feature wants its own tool. The other is a machine that runs several part numbers in rotation: common tools stay loaded, and a changeover means swapping the fixture and calling a different program.
The standard spindle reaches 10,000 rpm. A 12,000 rpm tapping / high-acceleration spindle and a 24,000 rpm high-speed spindle are optional. Y travel is listed as 300 mm (11.8 in) + 100 mm extension. None of the listed rows gives the maximum tool diameter or weight, and those limits decide which cutters can sit side by side in the changer, so ask for them.
Full Specifications
| Parameter | Value |
|---|---|
| X-Axis Travel | 300 mm (11.8 in) |
| Y-Axis Travel | 300 mm (11.8 in) + 100 mm extension |
| Z-Axis Travel | 330 mm (13 in) |
| Table Size | 500 x 300 mm (19.7 x 11.8 in) |
| Max Table Load | 100 kg (220 lb) |
| CNC Control | FANUC Series 31i-B Plus |
| Tool Capacity | 21 tools |
| Max Spindle Speed | 10,000 rpm (12,000 rpm tapping / high-acceleration and 24,000 rpm high-speed spindles optional) |
| Axes | 3-axis (Series 31i-B Plus) |
Specifications sourced from fanuc.co.jp — verified 2026-10-03
Strengths & Limitations
Strengths
- 21 tools, where the otherwise identical Robodrill α-D14SiB carries 14 tools
- Optional 12,000 rpm tapping / high-acceleration spindle for thread-heavy cycles
- 500 x 300 mm (19.7 x 11.8 in) table rated for 100 kg (220 lb)
Limitations
- X travel is only 300 mm (11.8 in), so long parts need a larger model
- 3-axis Series 31i-B Plus control; the 5-axis capable Series 31i-B5 Plus is on the Robodrill α-D21SiB5
- Z travel of 330 mm (13 in) limits tall fixtures and long drills
Best For
Frequently Asked Questions
01
They differ in tool capacity only: the Robodrill α-D21SiB holds 21 tools and the Robodrill α-D14SiB holds 14 tools. Count the tools your longest program needs, then add the ones you would like to leave loaded between jobs. If the total passes 14, the larger changer saves setup time on every changeover.
02
X is 300 mm (11.8 in) and Z is 330 mm (13 in). Y is listed as 300 mm (11.8 in) + 100 mm extension. The table measures 500 x 300 mm (19.7 x 11.8 in) and carries 100 kg (220 lb).
03
The axes row lists it as 3-axis on the Series 31i-B Plus. For a 5-axis capable control with the same 21 tools, 300 mm (11.8 in) X travel and 100 kg (220 lb) table load, FANUC lists the Robodrill α-D21SiB5 on the Series 31i-B5 Plus.
Videos
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