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  3. 三井精機工業
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三井精機工業

number of employees490
addressSaitama/Kawajima-cho, Hiki-gun/8 Hachiman 6-13
phone049-297-6333
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last updated:Jun 01, 2026
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三井精機工業 Product Lineup

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Horizontal machining center Horizontal machining center
Vertical machining center Vertical machining center
Jig grinding machine Jig grinding machine
Jig baller Jig baller
Screw grinding machine Screw grinding machine
Water-lubricated screw compressor Water-lubricated screw compressor
Oil-lubricated screw compressor Oil-lubricated screw compressor
Oil-lubricated scroll compressor Oil-lubricated scroll compressor
Peripheral devices Peripheral devices
5-axis machining center 5-axis machining center
Vertical

Vertical machining center

This is an introduction to vertical machining centers.

Precision Profile Center "PJ812"

The ultimate mother machine that achieves high-precision positioning of jig borers and high-precision shape processing.

In addition to the gate-shaped symmetry structure that takes thermal deformation into account, the displacement amount in the Z-axis has been improved to about one-third of the conventional value due to the newly developed main axis thermal displacement correction function. The distance between the main axis center and the Z-axis drive unit has been minimized, resulting in improved Z-axis rigidity. 【Features】 ■ Cooling of various parts to suppress heat generation ■ The mechanical structure is a completely symmetrical structure ■ High followability achieved with corner slides ■ Head configuration driven by the center of gravity ■ Stable high precision over an extended period *For more details, please refer to the PDF materials or feel free to contact us.

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Vertical Machining Center 'Vertex55III/55XIII'

Capable of loading workpieces with a maximum diameter of φ750mm and a height of 525mm! Introducing a 3-axis and 5-axis controlled vertical machining center.

The "Vertex55III/55XIII" is a vertical machining center equipped with a high-performance spindle thermal displacement compensation function, improving the Z-axis displacement amount to one-third of the previous level. With enhanced bed and column rigidity, the surface quality of three-dimensional shapes using micro linear feed has improved. Additionally, we offer an optional 15" color LCD control panel equipped with Human-Machine Interface (HMI) functionality. We have a lineup of the model-changed 3-axis "Vertex55 III" and the 5-axis "Vertex55X III." 【Features】 ■ High precision indexing and repeatability ■ Roundness of tapered cone machining ■ Added temperature sensors for instant detection and correction of temperature changes ■ Reduced time until Z-axis displacement stabilizes ■ Spindles with selectable precision and strength according to processing needs ■ Compact body *For more details, please refer to the PDF materials or feel free to contact us.

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Vertical Machining Center 'Vertex75III/75XIII'

Capable of loading workpieces with a maximum diameter of φ950mm and a height of 650mm! Introduction to 3-axis and 5-axis controlled vertical machining centers.

The "Vertex75III/75XIII" is a vertical machining center equipped with a high-performance spindle thermal displacement compensation function, improving the Z-axis displacement amount to one-third of the previous level. With enhanced bed and column rigidity, the surface quality of three-dimensional shapes using micro linear feed has improved. Additionally, an operation panel with a 15-color LCD featuring a human interface (HMI) function is available as an option. We offer a lineup of the 3-axis "Vertex75III" and the 5-axis "75XIII." 【Features】 ■ High precision indexing and repeatability ■ Additional temperature sensor ■ Instant detection and compensation for temperature changes ■ Reduced time until Z-axis displacement stabilizes ■ Displacement amount is approximately one-third of the previous level ■ Compact body *For more details, please refer to the PDF document or feel free to contact us.

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Vertical Machining Center 'VU50A'

Adopting a wide working area table! Maintains stable tool mounting accuracy during high-speed rotation of the main spindle.

The "VU50A" is a vertical machining center that achieves high speed and high precision. The spindle end face is equipped with a standard two-face constraint "BIG Plus." This maintains stable tool mounting accuracy during high-speed spindle rotation. To enhance rigidity, the bed and saddle are thickened, with a height of 1000mm from the floor to the top of the bed. Additionally, the increased height facilitates easier chip removal. 【Features】 ■ Rapid feed rate of 36m/min (X-axis, Y-axis) reduces non-cutting time ■ Adopts a wide working area table (1,100×580mm) ■ Finished, assembled, and adjusted by skilled technicians with know-how in mother machine production, supporting precision ■ The wide width of the bed and sliding surfaces results in an extremely low overhang structure *For more details, please refer to the PDF document or feel free to contact us.

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Vertical Machining Center "VU65A"

Adopting corner guides for long-term accuracy maintenance! Even with a maximum pitch of 1000mm, the maximum error is within ±4μm.

The "VU65A" is a vertical machining center that achieves high precision pitch accuracy even with large workpieces. It features two sub-guides outside the main guide, maintaining the fundamentals of narrow guides while enabling high-precision movement without overhang. Air pockets are provided in the sliding parts of the X and Y axes, allowing compressed air to pass through, which reduces load and enables smooth feeding while maintaining rigidity. 【Features】 ■ Adoption of square guides for long-term precision maintenance and high rigidity ■ Four guides on the Y-axis ■ No overhang when the X-axis moves to the stroke end ■ The spindle is a standard high-rigidity gear-driven 50T at 6,000 min-1 (options available for 50T at 12,000 min-1 and 40T at 20,000 min-1) *For more details, please refer to the PDF document or feel free to contact us.

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Precision Center PJ303X

The precision machinery of Mitsui Seiki is bringing innovation to precision micro-machining with the newly created Precision Center PJ303X.

Equipped with the latest spindle thermal displacement correction function as standard. Significant suppression of thermal displacement of the spindle and head through a special thermal displacement cancellation mechanism. A left-right symmetrical gantry column structure that takes thermal deformation into account. Adoption of high-speed linear motors for the linear axis and DD motors for the rotary axis. The front opening width has been increased with a rotating two-stage door.

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