History

Nov. 1911

Shigiya Loom Works established by company founder Nakajiro Shigitani in Higashi-sakura-machi, Fukuyama City.
The company manufactured looms. The company was later renamed Shigiya Loom Works.

Mar. 1952 Started planning the manufacture of machine tools and began development of universal grinders and tool grinders.
Sep. 1958 Changed the company’s trade name to Shigiya Seiki Kogyosho. Complete shift of company business to machine tool manufacturing. Started the development of cylindrical grinders.
Nov. 1960 Incorporated the company to establish Shigiya Machinery Works, Ltd., with a paid-in capital of 1.5 million yen.
Jan. 1961

Moved the headquarters and factory from Nishi-machi, Fukuyama City to Nishi Kashima-cho, Fukuyama City [currently Kashima-cho] in order to expand the business.

Apr. 1963 Established Tokyo sales office in Chuo-ku, Tokyo.
Aug.1967 Established Osaka branch office (currently sales office) in Yodogawa-ku, Osaka City.
Jul. 1970 Established Nagoya branch office (currently sales office) in Minami-ku, Nagoya City.
Feb. 1974 Established a sales system eyeglass processing machinery. The department was spun-off to establish the Grand Seiko affiliate company.
Oct. 1984 Current headquarters/factory completed in Minoshima-cho, Fukuyama City and all functions relocated.
Jan. 1985 Established Ota branch office in Ota City, Gunma Prefecture.
Jun. 1986 Established Hamamatsu branch in Hamamatsu City, Shizuoka Prefecture.
Dec. 1988 Established an affiliate company Shigiya Kiko Co., Ltd.
This was aimed at strengthening overhaul and retrofitting business.
Mar. 1990 Established Shigiya (USA) Ltd.Began sales and service business in the U.S.
Jun. 1992 Completed temperature-controlled factory.
Established an exhibition area for the latest machinery.
May 1994 Tokyo sales office relocated to Kawaguchi City, Saitama Prefecture.
Mar. 1999 Completed ISO9001 certification.
This was aimed at ensuring providing consistency in products and services and improving customer satisfaction.
Apr. 2005 Completed building No. 2 assembly factory and the precision measurement room. Introduced 3D measurement machinery aimed at improving product quality levels.
May 2005 Opened Shanghai office.
Oct. 2006 Completed expansion of Technical building, Sales building and Administration building.
Jan. 2007 Completed No. 3 assembly factory.
This was aimed at increasing assembly capacity by 50%.
Aug. 2008 Completed surface grinding factory area.
Introduced ultra-high precision gate type plane grinders.
Improved processing and processing precision of large beds.
Reduced scraping and grinding processing lead time by 60%.
Sep. 2010 Established SF Precision Co., Ltd. (currently Shigiya Machinery Korea Co., Ltd.) (Korea).
Oct. 2010 Established Shigiya (Thailand) Ltd. Began service and retrofit business.
Established Shigiya (Shanghai) Ltd.Established the Shanghai office as a local subsidiary and began sales and service business.
Jan. 2011 GAV-10・15 vertical CNC angular cylindrical grinder awarded at the “53rd 10 Major New Products Awards” (2010) and “Small and Medium Sized Business Awards” sponsored by Nikkan Kogyo Shimbun, Ltd.
Nov. 2011 Celebrated 100th anniversary of the company’s founding.
Apr. 2013 Merged 100% wholly owned subsidiaries Grand Seiko Co., Ltd. and Shigiya Kiko Co., Ltd. into Shigiya Machinery Works, Ltd.
Newly established the GS Business Division (Ophthalmology and eyeglass equipment).
May 2013 New office building construction completed on the headquarters grounds.
Nov. 2013 Completed large machinery assembly area 4. This was aimed at increasing assembly capacity by 40%.
Advisor Sadamasa Shigitani awarded the fall Medal with Yellow Ribbon.
Jan. 2015 Korean local subsidiary SF Precision Co., Ltd. renamed Shigiya Machinery Korea Co., Ltd.
This was aimed at expanding the overhaul business for machines sold within Korea.
Mar. 2015 Selected as one of the “300 Vibrant Small and Medium Enterprises”.
Oct. 2016 Established Taiwan Shigiya Co., Ltd. The company produced the GPLT-30 series in Taiwan.
Dec. 2018 Selected as a “Leading Future Regional Business”.

Development History

1955 • Completed the prototype development of a universal and tool grinder.
1959 • Completed the development of the G-24 cylindrical grinder.
1964 • Developed a large-size cylindrical grinder that could be used as a crank-pin grinder.
1965 • Completed the development of the G-18 cylindrical grinder for the mass production of small parts.
1970 • Completed the development of the G-27 series of grinders, which were an upgrade of the G-24 series.
1974 • Developed the GP-65 large-size grinder with a center distance of 4,000 mm.
1978 • Developed the GAS-27 angular slide cylindrical grinder.
1979 • Completed the development of the GP-45 cylindrical grinder with a center distance of 2,200 mm.
1980 • Completed development of the GN-27, our company’s first CNC cylindrical grinder optimal for wide variety, medium volume production.
1982 • Upgraded the G-27 series to the G-30 series.
• Upgraded the G-18 series to the G-20 series.
1988 • Upgraded the G-30 series to the G-30B series.
1991年 • Upgraded the GP-65B series to the GP-65D series.
This was the largest size table traverse type CNC cylindrical grinder in Japan.
Standard specifications included a workhead/tailstock which could support up to a maximum work weight of 3,000 kg (fixed work spindle), a wheel head which supported superior rotational accuracy for standard grinding wheels with an outer diameter of Φ915 mm (or optionally Φ1,065 mm), and other high rigidity design components which allowed for high precision and high efficiency grinding of large spindle types and large diameter rolls.

• Completed the development of a large-size CNC cylindrical grinder.
1992 • Completed the development of the GPC/GAC-30・40 compact CNC cylindrical angular grinder.
1996 • Completed the development of the GCM-30 CNC masterless cam grinder.
• Completed the development of the GPS-30 series general-purpose CNC cylindrical grinders.
1998 • Completed the development of the GPX-30 ultra-precision cylindrical grinder which used a concrete bed.

• Upgraded the GAS-30 series to the GAS-30B series.
Allowed for attachment of grinding wheels with a diameter of Φ610 mm and maximum width of 120 mm.
High precision wheel spindle rotation enabled precision heavy grinding and simultaneous outer diameter and face grinding which resulted in higher efficiency processing.
1999 • Upgraded the GPC-30 to the GPC-30B.
This was a wheelhead traverse type grinder.
Achieved a machine width of 1,950 mm in the 400 mm center-distance class.
Was equipped with a grinding wheel diameter of Φ510 mm and grinding wheel width of 125 mm. The equipped wheel spindle motor was 15 kW.
This was a compact type which played a role in production line structure and allowed for easier transition to automation.

• Upgraded the GAC-30 to the GAC-30B.
This was a wheelhead traverse type grinder. Was equipped with a (optional) grinding wheel diameter of Φ610 mm and grinding wheel width of 125 mm.
Can be equipped with a 15 kW wheel spindle motor (optional).
Achieved a machine width of 1,950 mm in the 400 mm center-distance class.
This was a compact type which played a role in production line structure and allowed for easier transition to automation.

• Completed the development of the APG-35 HDD glass substrate processing machine.
• Completed the development of the GAE-30 series of general-purpose CNC angular cylindrical grinder.
2000 • Completed the development of the GPC/GAC-20 CNC cylindrical/angular grinder for small parts.
• Completed the development of the GRN-20 series of CNC compact rubber roll grinder
2001 • Completed the development of the APG-10T, a grinder which could simultaneously grind inner and outer diameters and was also suitable for compact HDDs.
• Completed the development of the GNW-20・10, a dual-head CNC cylindrical grinder for small parts.
2002 • Upgraded the GCM-30 series masterless cam grinder to complete the development of the GCMH-30 series.
• Completed the development of the GPES-30 series CNC eccentric pin/polygon grinder.
• Completed the development of the GSF-30 special-purpose CVT grinder.
2003 • Completed the development of the GCO-16 CNC centerless cylindrical grinder.
The addition of a table traverse (Z-axis slide) function to a centerless cylindrical grinder allowed for superior productivity and grinding precision.
The Z-axis slide system permitted high-precision grinding of long, small diameter workpieces such as carbide drills.
Allowed for automation of processes when equipped with a loader.

• Developed the GSU series CNC universal grinders.
2004 • Completed the development of the GPC-30B・25 compact CNC cylindrical grinder.
This was a plain type traverse grinder. Achieved a machine width of 1,580 mm in the 250 mm center-distance class.
It was equipped with a Φ510 mm wheel size as standard.
This was a compact type which played a role in production line structure and allowed for easier transition to automation.

• Completed the development of the GPH-30 series of CNC cylindrical grinders with handles.
This model was developed based on requests from manufacturing sites.
This CNC cylindrical grinder was capable of handling single-product grinding to small-lot production in a diverse range of scenarios.
The MeisterHandwheels, sophisticated operating buttons and component layout allowed operators to more accurately apply their skills.
It was equipped with an electronic stopper to simplify processing area setting.
2006 • Completed the development of the GAC-30B・25 compact CNC cylindrical grinder.
This was an angular type traverse grinder. Achieved a machine width of 1,580 mm in the 250 mm center-distance class.
It was equipped with a Φ510 mm wheel size as standard.
This was a compact type which played a role in production line structure and allowed for easier transition to automation.

• Completed the development of the GNW-30・25, a dual-head CNC cylindrical grinder.
The dual head method allowed for simultaneous grinding of 2 locations for higher productivity.
The left side wheelhead had a swivel angle of 0° (fixed).•The right side wheelhead had a swivel angle of 8° (fixed).
The wheel size was Φ510 mm, with a rotary dresser and direct AC servo moto connection.
(Dress spindle number of rotations: 10,000 rotation per minute)
2008年 • Upgraded the GPX-30 ultra-high precision CNC cylindrical grinder to the GPXⅡ-30 series.
Focused of Shigiya’s technology framework!
In addition to our non-concentric hydrodynamic bearing type core technology, the closed type hydrostatic slide wheelhead feed and Shigiya brand extremely low vibration wheel spindle motor, together with the hydrostatic workhead reducing machine vibration, allowed for high precision grinding surface finishing.
The wheelhead handle mounted on the machine front and table feed handle mechanism made ultra-high precision processing possible while still feeling like a general purpose machine.

• Completed the development of the GACL-20・20 linear motor type compact CNC angular cylindrical grinder.
Used a linear motor and high resolution linear scale as the wheelhead and table feed mechanism to achieve high precision positioning.
Used a newly designed bed which took thermal displacement into account and a high rigidity wheelhead unit equipped standard with a Φ510 mm wheel size to contribute to high precision and high productivity.
The 1,500 mm machine width contributed to reduced space requirements.
Allows for automation when combined with a loader.

• Upgraded the GAE-30 series general-purpose CNC angular cylindrical grinder to the GAE-30B series.
This was a full model change of the GAE-30 series.
The popular GAE-30 series general-purpose CNC angular cylindrical grinder was redesigned with a center distance of 250 mm. The machine width was successfully reduced by 38% compared to previous models.
The wheelhead unit wheel size was increased from the previous Φ455 mm to Φ510 mm, contributing to higher productivity and operating ratios.
2010年 • Upgraded the GP45-B series general purpose medium sized cylindrical grinder to the GP-45D series.

• Upgraded the GSU-40 series CNC universal grinder to the GSU-40B series.
The wheelhead was swiveled at high-speed by a direct drive system, and provided high positioning accuracy without backlash.
Ten different wheelhead mounting patterns were available to accommodate a variety of multi-grinding, and a reduction of processes.
The X-axis hydrostatic slide system and C- and X-axis control (optional) permit eccentric and polygonal grinding.

• Upgraded the GPES-30 series CNC eccentric pin/polygon grinder to the GPES-30B series.
The bed and each unit model were changed to have higher rigidity and be more compact (70% of the previous model).
The closed type hydrostatic wheelhead slide and direct drive workhead achieved improved feeding rigidity and high-speed, high-precision grinding.
Accommodated a range of grinding processes, including punching tools, crankshaft pin grinding, cylindrical grinding, and more.

• Upgraded the GPS-30 general-purpose CNC cylindrical grinder and GPL-30 series CNC cylindrical grinder to the GPS-30B and GPL-30B series.
The GPS-30B and GPL-30B series were redesigned with a center distance of 250 mm. This contributed to reducing production line space requirements.
The bed and wheelhead were integrated, increasing the rigidity of the unit, and allowing for heavy-duty grinding.

• Developed the GAV-10・15 vertical CNC angular cylindrical grinder.
Developed based on a concept of “minimizing machine width as much as possible”. Achieved a machine width of only 780 mm.
This contributed to reducing production line space requirements.
This was Japan’s first double-center type vertical grinder. It was a machine optimal for grinding of small work pieces.
It was an angular type allowing for grinding of outer diameters and faces.

• Developed the GHC-15・130 ultra-high precision NC center hole grinder.
Shigiya’s cutting-edge technology was focused to develop a center hole grinder with a level of ultra-high precision never seen before.
Adoption of Shigiya’s hydrostatic planetary bearing for the wheel spindle permitted grinding of center holes with ultra-high precision.
High-precision grinding of center holes made it possible to push cylindrical grinding to a higher level of accuracy.

• Upgraded the GPH-30 series to the GPH-30B series CNC cylindrical grinder with MeisterHandwheels.
The MeisterHandwheels improved operation efficiency, and made precision grinding possible.
Improved rigidity of the bed unit also allowed for heavy duty grinding.
2011 • Completed development of the GAV-10・20 vertical CNC angular cylindrical grinder.
This was a minor change to the GAV-10.15 vertical CNC angular cylindrical grinder.
This was a vertical CNC cylindrical grinder with double-center support optimal for small workpieces shorter than 200 mm.
The compact design body contributed to reducing production line space requirements.
Was available with both plain type and angular type mirror image patterns.
This made it possible to auto-grind a wide range of patterns even with multiple machines installed.
The innovative gate structure with thorough countermeasures against vibration and thermal displacement ensured stable dimensional accuracy.


• Completed development of the GPV-10・20 vertical CNC cylindrical grinder.
2012 • Developed the GPEL-30・25 high-speed CNC eccentric pin grinder.
This machine achieved the world’s top level high-speed pin grinding (workpiece rotation 400 min-1).
This was a high-speed CNC eccentric pin grinder which contributed to higher crankshaft efficiency and productivity.
Eccentricity and phase angle could be easily set using interactive programming software.
There was no need to change jigs, which reduced process change preparation time, making operation easier for operators.
Incorporated a built-in wheel spindle motor for reduced wheelhead weight.
Use of a linear motor for the wheelhead feed motor and high-output built-in servo motor for spindle orientation, enabled both high-speed and stable C-X axis control.
The traverse type table feeding also assured high-precision grinding.
2014 ・• Completed the development of the GPD-20・43 double-drive CNC cylindrical grinder.
Based on fundamental concepts of “No setup needed,” “Improving processing accuracy”, and “Improving maintenance,” these cylindrical grinders offered a completely new design using a double-center drive system.
The standard specification was equipped with NC movable workheads on the left and right sides, allowing for adjustment of the distance between centers to support workpiece lengths between 30 and 430 mm without setup changes.
The combination of CBN wheel and multi-step sizing in-process gauge helped achieve consistent processing accuracy with high precision.
2018 • Developed the GMP-30.30 CNC cylindrical grinder (for mass production lines).
Shifting to a packaged specification format allowed for faster response to customer requests.
The specialized bed made the unit more compact and improved maintainability.
A variety of options were offered for automation and high productivity for mass production processing equipment.

• Upgraded the GPEL-30・25 high-speed CNC eccentric pin grinder to the GPEL-30B.25.
This was a full model change of the GPEL-30・25.
Increased rigidity of the workhead and wheelhead feed (linear motor feed) and increased motor output allowed for high speed processing with even greater stability.
The machine was compatible with double-center specs, chucks, and a wide range of other tooling applications.
The specialized bed reduced the machine width by 17% compared to previous models.

• Began offering a lineup of new model MeisterHandwheels as options for the GPH-30B series.
Equipped with a new model of MeisterHandwheels, the refined design and functionality provided an even greater degree of safety and ease of use.