Seibu SFG-35HP

Q: How much does the Seibu SFG-35HP cost?

The price estimate for the Seibu SFG-35HP is uncertain: we have no price for it that we can cite and no estimate we can stand behind, so we give no figure. Configuration, tooling, automation and installation move the final price substantially. A specific price can be requested at https://machinetoolindex.com/machines/seibu-sfg-35hp#price; the request is passed to Seibu or an authorised dealer.

Specs verified 2026-10-05 · seibudenki.com Updated 2026-10-05

Image: seibudenki.com, Seibu

Key Specifications

Max Spindle

3,000 min-1

Spindle Power

AC spindle motor 2.2/3.7 kW (3.0/5.0 hp) (continuous/30 minute rating)

chuck size

6 inch

max gripping work size

Φ150×L150 (maximum processing length 100 mm (3.9 in)); varies depending on workpiece shape, weight, and cutting tool interference

x axis travel

350 mm (13.8 in)

z axis travel

220 mm (8.7 in)

How much does the Seibu SFG-35HP cost?

Price estimate

Uncertain

We do not have a price for the Seibu SFG-35HP that we can stand behind, so we show no number. Configuration, options and installation move the final price a long way: a quote is the reliable figure.

Overview

The Seibu SFG-35HP is a chucking machine that cuts and grinds in one setup. Seibu files it under grinding machines and describes the SFG series as cutting plus grinding of inside and outside diameter workpieces. It has a 6 inch standard chuck, X and Z travels of 350 mm (13.8 in) and 220 mm (8.7 in), and a 0.01 µm minimum setting unit.

Resolution is what the HP suffix stands for in the table. The minimum setting unit and the X and Z scales are both 0.01 µm, where the SFG-35P of the same size is set in 0.1 µm steps and lists its 0.1 µm scale as an option. For bore and form tolerances in carbide, that is the row to read first. Seibu's inside grinding sample from this model, in Carbide(G5), reports a surface roughness of Rz 0.15 µm after a processing time of 2.0 hours.

The spindle is a built-in type running to 3,000 min-1, driven by an AC spindle motor rated 2.2/3.7 kW (continuous/30 minute rating), with a Φ32 mm (1.3 in) through hole. Its C axis is position control only as standard. Synchronous control is an option. Rapid traverse on X and Z is 4,000 mm/min (157.5 ipm).

Seibu gives the maximum gripping work size as Φ150×L150 with a maximum processing length of 100 mm (3.9 in), and notes that it varies with workpiece shape, weight and cutting tool interference. The machine measures 1,690 × 1,980 × 1,776 mm (66.5 × 78.0 × 69.9 in), weighs 2,500 kg (5,511 lb) including the control board and has a 270 or 370 L (option) tank. The spindle centre is 1,100 mm (43.3 in) above the floor.

Full Specifications

Parameter	Value
Chuck Size	6 inch
Max Gripping Work Size	Φ150×L150 (maximum processing length 100 mm (3.9 in)); varies depending on workpiece shape, weight, and cutting tool interference
X Axis Travel	350 mm (13.8 in)
Z Axis Travel	220 mm (8.7 in)
Rapid Traverse Xz	4,000 mm/min (157.5 ipm)
Minimum Setting Unit	0.01 µm (X axis is diameter)
Scale Xz	0.01 µm
Center Height Above Cross Saddle	105 mm (4.1 in)
Max Spindle Speed	3,000 min-1
Spindle Bore	Φ32 mm (1.3 in)
Spindle Drive	Built-in
Spindle Motor Power	AC spindle motor 2.2/3.7 kW (3.0/5.0 hp) (continuous/30 minute rating)
Spindle C Axis	Position control only (synchronous control is an option)
Spindle Center Height From Floor	1,100 mm (43.3 in)
Machine Dimensions	1,690 × 1,980 × 1,776 mm (66.5 × 78.0 × 69.9 in)
Machine Weight	2,500 kg (5,511 lb) including control board
Tank Capacity	270 or 370 L (option)

Specifications sourced from seibudenki.com — verified 2026-10-05

Strengths & Limitations

Strengths

0.01 µm minimum setting unit with 0.01 µm scales on X and Z
Cutting and grinding of inside and outside diameters in one chucking, as Seibu describes the SFG series
Built-in spindle to 3,000 min-1 with a Φ32 mm (1.3 in) through hole
Seibu's inside grinding sample from this model lists a surface roughness of Rz 0.15 µm in Carbide(G5)
350 mm (13.8 in) of X travel and 220 mm (8.7 in) of Z travel, with 4,000 mm/min (157.5 ipm) rapid traverse

Limitations

Maximum processing length is 100 mm (3.9 in)
C-axis synchronous control is an option; position control only is standard
Spindle motor is 2.2/3.7 kW (continuous/30 minute rating), sized for finishing, not heavy stock removal
The 370 L tank is an option; 270 L is the alternative listed

Best For

Carbide and tool-steel chucking parts finished inside and outside in one setup Bores and forms that need a 0.01 µm setting unit Spherical and free-form surfaces of the kind Seibu shows for the SFG series Short parts within a 100 mm (3.9 in) processing length

Frequently Asked Questions

01 Is the SFG-35HP a lathe or a grinder?

Seibu lists it as a grinding machine, and its feature page for the SFG series shows cutting plus grinding of inside and outside diameter workpieces with improved process efficiency through one chucking. The layout is that of a chucking machine: a 6 inch chuck, a built-in spindle and X and Z slides.

02 What is the difference between the SFG-35HP and the SFG-35P?

Resolution, scale and tank. The SFG-35HP has a 0.01 µm minimum setting unit and 0.01 µm scales on X and Z, with a 270 or 370 L (option) tank. The SFG-35P has a 0.1 µm setting unit, lists its 0.1 µm scale as an option and has a 270 L tank. Travels, spindle and weight are the same.

03 How large a workpiece can the SFG-35HP grip?

The table gives a maximum gripping work size of Φ150×L150 and a maximum processing length of 100 mm (3.9 in). Seibu adds that the size varies depending on workpiece shape, weight and cutting tool interference, so check the actual part and tooling layout with the maker.

04 What spindle does the SFG-35HP have?

A built-in spindle with a maximum speed of 3,000 min-1 and a Φ32 mm (1.3 in) through hole. The main motor is an AC spindle motor rated 2.2/3.7 kW (continuous/30 minute rating). The C axis is position control only, with synchronous control as an option.

05 What surface finish has Seibu published for the SFG-35HP?

Two samples name this model. The inside grinding sample in Carbide(G5) lists Rz 0.15 µm with a processing time of 2.0 hours. A skill test piece in SKD61 lists Rz 0.15 µm on the inner surface and Rz 0.18 µm on the outer. Seibu also prints an Ra value for each; see the maker's page for those.