For over 30 years, Rubin Engineering & Sales has been providing CNC machine repairs and services for a diverse customer base. We can work with nearly any brand and provide reverse engineering for out-of-production components. Our team has the capabilities to work on ball screws, drives, spindles, chip conveyors, way covers, and electric controls. All repaired or remanufactured components will meet OEM standards.

Learn more about CNC machines, common issues they face, and the services we offer.

What Is a CNC Machine?

Computer numerical control (CNC) machining is a subtractive manufacturing process that uses an automated program to create parts. The computer controls the tool’s movement and speed (RPM) to cut away material from the workpiece until the desired component is achieved.

While each CNC machine varies, they generally share five main parts: the computer, the chuck, the motor, the cutting bit or other tooling device, and the vise. The computer and electronic components dictate how the manufacturing is performed, usually through a G code. The CNC motor is often enclosed in the machine and rotates the chuck at high speeds. The chuck holds the cutting tool or bit—usually made of high-quality steel—so it can perform the cutting. The vise keeps the workpiece in place so it won’t fly out of the machine.

CNC machine

Common Issues With CNC Machines

Like any other machine, CNC machines can face various problems over the course of their service life. Here are some common issues with CNC machinery parts.


The machine and various parts will need to be routinely cleaned of debris to prevent buildup. Excessive debris can lead to inaccuracies in the machining process or even machine failure.


From time to time, G and M codes will need to be reprogrammed to maintain efficiency. In other scenarios, actual electronic components in the computer will need to be updated or repaired.


For a CNC machine to work, it needs to properly dispense coolant and be adequately lubricated. Insufficient amounts of lubrication or coolant can lead to damage and machine failure.


The breakdown of bits and cutting tools is unavoidable. While most CNC tools and components are long-lasting parts, they all eventually wear down over time. The life of cutting tools and bits can be extended through proper maintenance, but they will still need to be replaced after a certain amount of usage. If the machine is overheating or produces excessive vibration, it is probably time to replace the bit or cutting tool.


The correct tooling needs to be used for specific materials and processes. For example, a harder tool—like carbide tooling—will need to be used for difficult materials like stainless steel or tool steel alloys. There is also a difference between machine brand and component brand, so it’s important to work with a repair company that knows this. Some brands are cross-compatible while others are not.

CNC Repair and Replacement Parts

This is an overview of the repairs and replacement parts we offer.

CNC Electronic Parts

Our team is capable of testing, maintaining, and repairing over 80 component brands as well as over 25 machine tool manufacturers. We can work on nearly any part of the CNC machine, including:

  • Servo motors
  • Circuit boards
  • Power supplies
  • Spindle drives
  • Monitors
  • Motor controls
  • Transducers
  • Encoders
  • Keypads

Ball Screw Assembly

A ball screw assembly contains a screw and nut, both of which have matching helical grooves. Balls roll between these groves—the only contact between the screw and nut.

Rubin E&S provides repair and maintenance services for ball screw assemblies, including emergency repair services, regrinding, and reverse engineering for obsolete or unique components. The expert technicians and engineers at Rubin E&S can work on almost any brand or design. We can even manufacture new ball screws according to the exact specifications of a sample or print.

CNC Spindle Rebuild

A variety of factors can lead to spindle failure. Normal wear and tear is the leading cause, but improper lubrication, mishandling, and contamination are other leading culprits.

Rubin E&S has the capabilities to complete full CNC rebuilds and service all spindle brands and designs. This includes motorized, non-motorized, coolant-cooled, and other types. We can also rebuild and reinstall the spindle’s drawbar to achieve peak operation. Every repaired spindle is tested at maximum RPM to prevent high temperatures, nose-end run-out, and vibration.

CNC Way Cover Repair

Way covers prevent chips and coolant from getting in the guide rails, ball screw, and home switch. If the way cover fails, it can result in machine damage and downtime. Our team can quickly repair, maintain, or refurbish worn way covers. During this process, our technicians can also repair or replace guides, scissors, rollers, and wipers. Steel components will be cleaned, straightened, and polished so the cover looks new. When needed, we can custom-design a new way cover to meet specific demands.

Chip Conveyor Repair

If a chip conveyor is constantly breaking down or getting backed up, it will slow down the entire manufacturing process. Our team can quickly and efficiently minimize downtime caused by faulty chip conveyors. The technicians at Rubin E&S can work on nearly every component of the chip conveyor, such as the motors, drive chains, structural components, shafts, chain guides, sprockets, scrapers, links, gear reducers, and electronic gear controls.

Brands Rubin Engineering & Sales Works With

We can work on all the major brands in the CNC machining industry.

Popular brands that our techs work with include:

  • Okuma
  • Makino
  • Mitsubishi
  • Mori Seiki
  • Mazak
  • Kitamura
  • Toyoda

Machine tool brands

  • Cincinnati
  • DeVlieg-Bullard
  • Fadal
  • G&L
  • Guhring
  • Haas
  • Hitachi
  • K&T
  • Kingsbury
  • Kitamura
  • Komo
  • Lodge & Shipley
  • Mazak
  • Mitsubishi
  • Mori Seiki
  • Okamoto
  • OKK
  • Okuma
  • Rimrock
  • Toshiba
  • Toyoda
  • Tsubaki
  • 20th Century
  • Hwacheon
  • NOOK

Ball screw brands

  • 20th Century
  • Beaver
  • Cincinnati Milacron
  • Giddings & Lewis
  • Modern American
  • NSK
  • Rotex
  • Saginaw
  • Sargent
  • Skully Jones
  • THK
  • Tsubaki
  • Warner

Electronic components brands

  • Advanced Controls
  • Allen Bradley
  • ASEA
  • B&K/Dynascan
  • Badger
  • Baldor
  • Balluff
  • Banner
  • Barber Coleman
  • BEI
  • Bendix
  • Berthold
  • Bridgeport
  • Cincinnati Milacron
  • Cleveland Machine
  • Contraves
  • Cutler Hammer
  • Data Metrics
  • Digital Equip. Corp
  • Dorian Tool
  • Dynamics Research
  • Dynapar
  • Eagle Signal
  • Emerson
  • Fairchild
  • Fanuc
  • Fincor
  • Foxboro
  • Friden
  • Fuji
  • G.E.
  • Gettys
  • Giddings & Lewis
  • Glentek
  • Gould-Modicon
  • Harowe
  • Heald
  • Heidenhain
  • Hewlett Packard
  • Hitachi
  • Honeywell
  • Indramat Drives & Power Supplies
  • Integrated Power
  • Kearney & Trecker
  • Kollmorgen
  • Lambda
  • Leeds & Northrup
  • Lilton Ind.
  • Magnetek
  • Metra
  • Micron
  • Mitsubishi
  • Okuma
  • Oriental
  • Parametrics
  • Philips
  • Powr Ups
  • Reliance
  • Remex
  • Renco
  • Rolfin
  • Siemens
  • Singer-Kearfott
  • Slo-Syn
  • Square D
  • Streeter
  • Sundstrand
  • Talley
  • Tamagawa Seiki
  • Tektronix
  • Texas Instruments
  • Toshiba
  • Trallfa
  • Trump-Ross
  • Unimation
  • Valeron
  • Vickers
  • Wang
  • Warner Swasey
  • West
  • Westamp
  • Westinghouse
  • Yaskawa

OEM brands

  • LNS Turbo
  • Mayfran
  • Jorgensen
  • Master
  • MC3
  • Titan
  • Knoll
  • Mitsui
  • Traub
  • Emag
  • New London

CNC Repair Capabilities

Rubin E&S offers more than just repairs. We also provide services like ball screw assembly and spindle rebuilds. When required, our team can provide reverse engineering services for obscure or older components.

Our team aims to provide repairs first, avoiding replacements when possible. Repairs are typically the first course of action, and they are often quicker and cheaper than CNC replacement parts. Repairing eliminates the need for retraining and reinstallation, which are common with replacements. Additionally, repairing allows operations to resume much quicker than replacing.

Our CNC repair capabilities include:

  • Short lead times
  • Working with old or obsolete components
  • Emergency repair or rebuilding
  • Onsite service
  • Breakdown service and repair
  • Expedited domestic and international shipments
CNC Repair Capabilities

CNC Repair Services & Replacement Parts From Rubin Engineering & Sales

Over the past three decades, Rubin Engineering & Sales has become one of the leading providers of CNC repairs and replacements. We have a comprehensive network of trusted service partners across the United States and the world. Our team can work on nearly any CNC machine regardless of brand, design, or vintage. We can even work on out-of-production components and use reverse engineering to get your machinery working like new.

To learn more about our onsite and cross-country capabilities or to initiate your repair, please request a quote.