How to replace the spindle?

The spindle is a key component of CNC machine tools. Many precision machining industries rely on the spindle to process parts. But the spindle may wear out with use and need to be replaced.

Spindles are a critical component in computer numerical control (CNC) machines, whether you are a home shop user or a factory user, you need to use spindle motors to provide the necessary power for your equipment. The precision machining industry in particular relies more heavily on spindle functions to accomplish critical tasks, and after a long period, spindles can wear out and need to be replaced. This article provides an in-depth guide to replacing spindles safely and correctly, so if you happen to need to replace your spindle, you can use this as a reference.


Safety preparation is ten times more important before you start working. First, you need to power down and unplug the machine to avoid accidents. You need to document the machine configuration, offsets, and parts program as replacements may require recalibration. Prepare the necessary accessories such as spindles, hardware, lubricants, and protective gear. Notify all relevant workers and supervisors of regular maintenance to coordinate schedules accordingly.

Dismantling process

Remove enclosures, shields, or guards protecting the work area. Disconnect power and pneumatic lines connected to the spindle. Extract the clamping mechanisms, workpiece clamps, and associated drive components connected to the spindle. Carefully remove the belt drive or gear coupling connected to the spindle motor, paying attention to precise alignment when reinstalling.

Cleaning and inspection of components

Thoroughly clean all disassembled parts to remove deposits or debris buildup. Inspect parts for signs of wear, cracks, corrosion, or other signs of damage that may require replacement. Check the integrity of bearings, seals, spindle housings, and mountings under bright light. Replace parts as appropriate for their condition.

Installation of replacement spindles

Before reinstallation, you will need to lubricate the bearings and align the new spindle to ensure that the mating surfaces of the components are not misaligned or sticking, reinstall disassembled parts, and correctly reconnect fittings, conduit lines, and drive mechanisms.

System recalibration and testing

You will also need to test your newly installed spindle before production use. Use tools to verify that motor operation, direction of rotation, and programmed speeds are within parameters. Recalibrate the offset and work coordinate system as needed when errors or inaccuracies are indicated after replacement.


By strictly following this replacement process, the life and reliability of the CNC machine can be maintained through routine periodic maintenance of critical components such as spindles.

Leave A Comment

All fields marked with an asterisk (*) are required
Contact us now to get your exclusive plan

More than 8,000 our customers