Ballscrew Guys > OKK

Ballscrew Guys are specialists in on-site repair and refurbishment of OKK Machining Center linear motion systems including ball screw assemblies and linear way guides.

Please contact us to troubleshoot your issue and follow up with a service request with travel and work estimates. See our flat rate specials and inquire about travel splits if your down time is flexible.

Ball nut disassembly and cleaning process.

Ball screw failure due to contamination.

Damaged X-Axis ball bearing return tube.

Refurbished ball screw ready for installation.

Fast response

We come to you to perform all services, typically within two weeks and completed the same day

Low cost

Our refurbishment services are cheaper than buying new or sending out for a regrind

Minimal downtime

We have serviced and installed hundreds of ball screws at manufacturer's facilities

Ballscrew Repair Services

Ballscrew Guys provide low cost, fast-response, on-site ball screw repair and refurbishment services for your OKK Machining Centers. Call (877) 768-4064 for immediate consultation.

Ball Screw Repair and Refurbishment
Ball Screw Installation and Removal
Ball Screw End Bearing Replacement

Linear Way Guide Rail Installation
Linear Way Guide Block Repair and Refurbishment

Clean, Flush, and Lube Service
For mail in service see: Richardson Precision Inc

Gallery

OKK VMC

Ball screw service on OKK MCV-1260.

Performed X-Axis ball screw service for an OKK MCV-1260 Vertical Machine Center. Nidec OKK had been making machine tools for 100 years in Osaka, Japan. OKK manufactured this vertical machining center. It also produced a horizontal machining center, a grinding center, a 5-axis vertical machining center, a 5-axis horizontal machining center, and a milling machine. The ball screw was removed from the machine for refurbishment. In addition to repairing the ball screw itself, which was damaged, the end bearings were replaced.

Ball nut disassembly and cleaning process.

Here, the ball nut disassembly started. The preliminary cleaning was completed. This ball screw assembly locked up due to contamination in the ball nut mixed with lubrication failure. A new ball screw was available but was considerably expensive with a 9-month lead time, having to be shipped from Japan. This particular ball nut referred to as a split-nut. There were two ball nut halves with a spacer shim locked in between the two halves. This shim, with properly sized ball bearings, established the drag torque and preload of the ball screw assembly.

Ball screw failure due to contamination.

This is the root of why the X-Axis ball screw on the OKKK MCV-1260 ball screw failed. Lack of lubrication mixed with internal contamination caused one of the ball bearing return tubes to shear its ball scoop. The returns are the six metal tubes seen on the side of the ball nut. The ball bearings circulate around the ball screw shaft in a spiraled helix. Then they get pushed off the shaft into the return tube. Then they move back to the ball screw bearing track. Each one of these return tubes is a separate loop of balls. Notice that this failure happened on the back end or follower end of the split nut. This is because what little lubrication this assembly received was through the flange side of the split nut.

Damaged X-Axis ball bearing return tube.

A close-up of the tube damage. This is a ball bearing return tube from the X-Axis ball screw found in an OKK MCV-1260 Vertical Machine Center. It was pushed out and bent after one of its ball bearing scoop “ears” sheared inside the ball nut. It pushed the side of the return tube up, deforming the tube before the screw locked up in the machine. The tube was straightened and reformed. Then, a new scoop was TIG welded onto the end of the ball bearing circulation guide tube.

Refurbished ball screw ready for installation.

Ball screw after repairs and refurbishment. This was for an OKK MCV-1260 Vertical Machine Center. The X-Axis ball screw was cleaned up and polished by Ballscrew Guys techs. Drag torque and preload were returned to the assembly. Waiting for installation back into the machine.

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