About Okamoto

Used Okamoto Grinding Machines for Sale

Resell CNC is your Simple. Reliable. and Trusted.® source for used Okamoto grinding machines — including reciprocating surface grinders, CNC surface grinders, double-column surface grinders, rotary surface grinders, cylindrical grinders, internal grinders, CNC profile and form grinders, grinding centers, and hand-feed surface grinders. We carry Okamoto models across the full product range, from compact Linear hand-feed surface grinders through ACC-series automatic and CNC saddle grinders, OGM cylindrical grinders, IGM internal grinders, VRG rotary surface grinders, and ACC-CHiQ double-column machines for large components.

Okamoto Machine Tool Works, Ltd. was founded in 1926 by Kakusaburo Okamoto in Japan as a special-purpose machine tool manufacturer. The company was reorganized under its current name in 1935 and has since built a reputation as the world's premier comprehensive abrasive processing machine manufacturer. Okamoto developed Japan's first surface grinder (the PSG-6), Japan's first gear grinding machine (the ASG-2), and the world's first CNC surface and profile grinding machine (the NFG-5). Okamoto Corporation, the US subsidiary, was established in the Chicago area and provides sales, service, and support across North America. The company also operates manufacturing and sales subsidiaries in Singapore, Thailand, Germany, and India. Okamoto is listed on the Tokyo Stock Exchange and continues to expand through acquisitions, recently adding Daiwa Koki and the NICCO surface grinding machine business. The iQ series represents the latest generation of Okamoto control technology. Okamoto machines serve tool and die, mold making, aerospace, automotive, medical, semiconductor, and precision manufacturing industries.

Looking to sell your Okamoto? Resell CNC buys used Okamoto grinding machines nationwide, covering any model, any size, and any condition. Free appraisal within 24 hours, competitive offers, and we handle all rigging and transportation. Call (844) 478-8181 or email sales@resellcnc.com.

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Okamoto Surface Grinders

Okamoto's surface grinder lineup is the most broadly traded product category on the used market. The ACC-SA saddle-type series features MDI-controlled three-cycle grinding. The ACC-DX series (ACC-618DX, ACC-820DX, ACC-1224DX) provides automatic incremental downfeed, cross-feed, and longitudinal feed for production precision. The ACC-NC series (ACC-818NC) delivers full CNC form, slot, step, and contour grinding with ballscrew table drives. The PSG-DX series offers versatile general-purpose performance. The Linear series (PFG-612, PFG-618) provides compact hand-feed capability for toolroom applications. Table sizes range from 6 by 12 inches through 32 by 80+ inches on double-column machines.

Okamoto Cylindrical, Internal & Specialty Grinders

The OGM series CNC cylindrical grinders deliver precision OD grinding with Fanuc controls. The IGM series internal grinders provide high-accuracy ID grinding for bores, tapers, and complex internal profiles. The VRG-DX vertical rotary surface grinders handle high-volume flat grinding on round and irregular parts. The UGM grinding center series provides multi-function capability. Double-column ACC-CHiQ and ACC-iQ series grinders handle large mold bases, die plates, and oversized precision components requiring surface flatness across extended dimensions.


Founded	1926 by Kakusaburo Okamoto, Japan
Headquarters	Yokohama, Japan (Tokyo Stock Exchange)
US Operations	Okamoto Corporation (Chicago area); also Singapore, Thailand, Germany, India
Best Known For	Surface grinders (world leader), cylindrical, internal, CNC form grinders
Popular Models	ACC-618DX, ACC-1224ST, ACC-818NC, OGM, IGM, Linear 618, VRG-DX
CNC Controls	Fanuc, Okamoto MDI/iQ, ballscrew and hydraulic table drives
Industries Served	Tool & die, mold making, aerospace, automotive, medical, semiconductor

What to Look for When Buying a Used Okamoto Grinder

Okamoto grinding machines are built with precision castings, hand-scraped ways (on premium models), and tight-tolerance spindle assemblies designed for surface finish quality measured in microinches. Here is what to inspect on used units.

Test the grinding spindle. The spindle is the most critical component on any grinding machine. Measure spindle runout at the wheel mount flange with a test indicator (readings should be in the tenths on precision grinders). Run the spindle to operating RPM and listen for bearing noise or vibration. Check for thermal stability by monitoring spindle growth after warm-up. On CNC models with Fanuc controls, verify that the spindle motor responds accurately to programmed speeds.

Verify table travel and way condition. On reciprocating surface grinders, check the longitudinal (X) and cross-feed (Y) table travel for smooth, consistent motion across the full stroke. On hydraulic table drive models, verify hydraulic pressure, reversals, and speed consistency. On ballscrew table drive models (ACC-818NC and other CNC machines), check positioning accuracy and backlash. Inspect the ways for wear by running a test indicator along the table surface.

Check the downfeed and automatic cycles. Test the vertical (Z) axis downfeed for accurate, consistent increment steps. On ACC automatic models, verify the three-cycle grinding sequence (rough, semi-finish, spark-out) for correct programming and execution. Test the auto incremental downfeed (IDF) for repeatable step sizes. On CNC form grinders (ACC-818NC), verify simultaneous 2-axis interpolation for contour grinding accuracy.

Inspect the magnetic chuck, coolant, and dressing systems. Verify even magnetic holding force across the entire chuck surface. Check for dips, warps, or surface damage on the chuck face. Test the coolant delivery system for adequate flow, pressure, and filtration. On machines with on-the-wheel dressers, verify the diamond dresser condition and test the dressing cycle for accurate wheel profile generation. On CNC models, test the wheel wear compensation function.

Okamoto ACC Saddle-Type Surface Grinders

The ACC-DX series (ACC-618DX, ACC-820DX, ACC-1224DX, ACC-1632DX) is Okamoto's production automatic surface grinder platform with three-axis automatic feeds, incremental downfeed, and wheel wear compensation. The ACC-SA series adds MDI control with stored grinding cycles for repeatable production sequences. The ACC-ST series (ACC-1224ST, ACC-1632ST) provides saddle-type configuration for larger table sizes. The ACC-NC series (ACC-818NC) delivers full CNC form grinding capability with ballscrew table drives and Fanuc control for surface, slot, step, and contour profiles. ACC saddle-type surface grinders are the most commonly traded Okamoto models on the used market.

Okamoto Linear, PSG & Double-Column Grinders

The Linear series (PFG-612, PFG-618) provides compact, hand-feed surface grinding for precision toolroom applications. These machines are popular with tool and die makers requiring quick setups and hands-on control. The PSG-DX series delivers versatile general-purpose automatic surface grinding. For large-component grinding, the ACC-CHiQ and ACC-iQ double-column surface grinders handle mold bases, die plates, and oversized precision components with table sizes reaching 32 by 80+ inches. The column crossfeed design provides exceptional rigidity for maintaining flatness across extended grinding lengths.

Okamoto Cylindrical, Internal & Rotary Grinders

The OGM series CNC cylindrical grinders provide precision OD grinding for shafts, pins, tooling, and cylindrical components with Fanuc CNC controls. The IGM series CNC internal grinders handle precision ID grinding of bores, tapers, and internal profiles for bearing races, gear bores, and hydraulic components. The VRG-DX vertical rotary surface grinders deliver high-volume flat grinding with continuous rotary table feed. The UGM grinding center series provides multi-function grinding capability (OD, ID, face, and form) on a single platform.

How to Sell Your Used Okamoto

Okamoto grinding machines hold strong resale value thanks to nearly a century of Japanese manufacturing heritage, industry-leading precision, and consistent demand from tool and die shops, mold makers, and precision manufacturers. ACC-series surface grinders are in particularly high demand, followed by OGM cylindrical and IGM internal grinders.

Resell CNC buys used Okamoto grinders, every model and size, nationwide.

Contact us — call (844) 478-8181 or email sales@resellcnc.com.
Free appraisal within 24 hours, no obligation.
Accept the offer — we handle rigging, transport, and logistics.

Frequently Asked Questions About Used Okamoto Grinders

Are used Okamoto grinders reliable?

Yes. Okamoto has manufactured grinding machines since 1926 and is recognized as the world's premier comprehensive abrasive processing machine manufacturer. The company developed Japan's first surface grinder and the world's first CNC surface and form grinder. Precision castings, tight-tolerance spindle assemblies, and Japanese manufacturing quality deliver proven long-term accuracy and reliability.

What industries use Okamoto grinders?

Okamoto grinding machines serve tool and die shops, mold and die makers, aerospace manufacturers, automotive production, medical device companies, semiconductor wafer processing, and general precision manufacturing. The surface grinder lineup is particularly popular with toolroom operations requiring flatness and surface finish accuracy in the low microinch range. Double-column models serve large mold base and die plate grinding.

What should I inspect before buying a used Okamoto?

Test spindle runout (tenths-level on precision grinders) and bearing condition. Verify table travel smoothness and way condition. Check downfeed accuracy and auto cycle function. Inspect the magnetic chuck surface for flatness. Test coolant delivery and diamond dresser condition. On CNC models, verify Fanuc control operation and axis accuracy.

What Okamoto models hold their value best?

ACC-1224DX and ACC-1632ST automatic surface grinders maintain the strongest resale values due to versatile sizing and broad demand. ACC-818NC CNC form grinders command premiums. OGM cylindrical grinders hold well in precision manufacturing. Call (844) 478-8181 for current valuations.

How do I sell my used Okamoto?

Contact Resell CNC at (844) 478-8181 or sales@resellcnc.com. We buy all Okamoto models nationwide, from Linear hand-feed surface grinders through ACC automatic and CNC grinders, OGM cylindrical grinders, IGM internal grinders, and double-column machines. Free appraisal within 24 hours.