What to Look for When Buying a Used OKK
OKK machines are built around rigidity and long-term precision. Most models use hand-scraped box ways, heavy ribbed castings, and high-torque geared spindles that reward proper maintenance and punish neglect.
Inspect the ways and lubrication system. Most OKK VMCs (VM, KCV, MCV) run on box ways rather than linear guides. Look for wear patterns, scoring, or uneven scrape marks on the X, Y, and Z slides. Verify the way-lubrication system is delivering oil to every point, check the oil filter, and confirm there are no dry spots under load. A well-maintained OKK will outlast most linear-guide machines; a neglected one is expensive to recondition.
Check the spindle and geared drive. Many OKK VMCs use two-stage geared spindle heads that deliver high torque at low RPM. Listen for gear noise in both ranges, test spindle runout with an indicator, and check for oil leaks at the spindle nose and head casting. On belt-drive models (PCV, some VM variants), inspect belt condition. On HM and 5AX machines, verify spindle thermal stability after full warm-up.
Cycle the ATC and pallet changer. OKK tool changers are typically arm-type and very reliable, but age and neglected grease can cause slow or rough movement. Cycle every pocket, run tool-to-spindle exchanges at full speed, and listen for hesitation. On HM and HMC horizontals, run the pallet changer through multiple cycles and verify clamp and unclamp signals.
Identify the control and documentation. OKK offered Fanuc and Mitsubishi MELDAS controls on most platforms, with some OKK-branded interfaces. Confirm the control generation, verify parameters are backed up, and check that manuals and schematics are included. Parts support now runs through Nidec Machine Tool's service network.
OKK Vertical Machining Centers
VM and VM II Series
The VM series (VM4, VM5, VM7) and updated VM II series (VM4II, VM5II, VM7II) are OKK's most widely traded VMCs in North America. Rigid 3-axis verticals with CAT 40 (sometimes CAT 50) geared spindles, box or hybrid way construction, and generous X, Y, Z travels. The VM43, VM53, and VM76 variants indicate table size. Popular with job shops running steel, stainless, and cast iron.
KCV Series (Box Way)
The KCV series (KCV-400, KCV-600, KCV-800, KCV-1000) is OKK's heavy box-way VMC family. Full hand-scraped box ways on all axes, a rigid column casting, and a high-torque geared spindle make these the top choice for heavy steel roughing and die work. KCV machines hold value well and are a favorite of mold shops.
PCV Series (High-Speed)
The PCV series (PCV-40, PCV-55) offers high-speed linear-guide vertical machining for production parts, aluminum, and lighter cuts. Faster rapids and lower inertia suit high-mix shops.
VP Series (Precision Mold)
The VP series (VP400, VP600, VP800, VP1000) was OKK's precision mold VMC platform. Thermal compensation, high-resolution scales, and tight geometric tolerances make VP machines sought after for graphite, hardened steel, and finishing work in mold shops.
OKK Horizontal Machining Centers
The HM series and HMC series (HM400, HM500, HM630, HM800, HM1000) are OKK's horizontal machining centers. Two-pallet changers are standard on most configurations, with optional FMS integration on larger models. Rigid traveling-column construction and large tool magazines (60 to 120+ tools) make these workhorses for automotive and heavy-equipment production cells. The HM630 is the most common size on the used market.
OKK Bridge Mills and 5-Axis
MCV Bridge-Type VMCs
The MCV series (MCV-410, MCV-560, MCV-660, MCV-820, MCV-1060, MCV-1280) are OKK's double-column bridge-type VMCs. Built for large workpieces in die, mold, aerospace structural, and heavy fabrication applications. High column rigidity and long Y-axis travel are the signature of this family.
5AX Series (5-Axis)
The 5AX series (5AX-600, 5AX-1000) provides 5-axis simultaneous machining with trunnion-style rotary-tilt tables. Suited to complex aerospace, medical, and mold work requiring single-setup processing.
How to Sell Your Used OKK
OKK machines hold solid resale value thanks to the brand's rigidity reputation, continued Nidec Machine Tool support, and steady demand from mold shops. VM, KCV, HM, and MCV machines move fastest on the used market.
Resell CNC buys used OKK machines, every model, every generation, nationwide.
- Contact us by calling (844) 478-8181 or emailing sales@resellcnc.com.
- Free appraisal within 24 hours, no obligation.
- Accept the offer and we handle rigging, transport, and logistics.
Frequently Asked Questions About Used OKK Machines
Is OKK still in business?
Yes. OKK was acquired by Nidec Corporation in 2021, renamed Nidec OKK, and consolidated into Nidec Machine Tool Corporation. OKK-branded machines continue to be manufactured and supported, and parts and service for legacy models are available through the Nidec Machine Tool service network.
Are used OKK machines reliable?
Yes. OKK built its reputation on rigidity and precision using hand-scraped box ways, heavy castings, and geared spindles on most VMC models. A properly maintained OKK will hold tolerance for decades. Machines neglected on lubrication or cooling can be expensive to restore, so inspection matters.
What CNC control does OKK use?
Most OKK machines ship with Fanuc controls, and Mitsubishi MELDAS is the second most common. Some models use OKK-branded operator interfaces running on Fanuc or Mitsubishi hardware. Always confirm the exact control generation before purchase.
What is the difference between the VM, KCV, and PCV series?
The VM series is OKK's general-purpose vertical machining platform. The KCV series uses full box ways on all axes for maximum rigidity on heavy cuts. The PCV series uses linear guides for high-speed, lower-inertia production work. Choose based on your material mix and cut severity.
What industries use OKK machines?
OKK has a strong installed base in die and mold, automotive, aerospace, heavy equipment, and general job-shop manufacturing. KCV and MCV families are especially popular with mold shops; HM horizontals are common in automotive production cells.
Does Resell CNC offer financing on used OKK machines?
Yes. Resell CNC offers flexible financing options to help your business acquire the equipment it needs. Contact us at (844) 478-8181 to discuss terms.
How do I sell my used OKK?
Contact Resell CNC at (844) 478-8181 or sales@resellcnc.com. We buy every OKK model, including legacy Osaka Kiko and current Nidec OKK machines, nationwide. Free appraisal within 24 hours.