Spindle Repair Process

High-speed CNC machinery represents a sizable cost investment for manufacturers. The beating heart of this essential industrial equipment is spindles. Because performance depends on micrometer-level precision, preventative spindle maintenance and high-quality spindle repairs or spindle replacements are vital for long-term operation.

Spindle repair process

How can you identify true professionals that provide excellent spindle repair? The key is to understand each of the steps that great ISO-documented repair technicians, such as our certified team members at Superior Spindle, should follow. If they do, it’s a sign they take your company, and its machinery, very seriously.


No two spindles are exactly alike, and neither is the role they’re required to play.

Our technicians perform a preliminary inspection to determine a few vital factors:

  • The Spindle’s Unique Function
  • The Part’s Overall Condition & Wear
  • Preliminary Suppositions Regarding the Cause of Failure
  • Any Unique Assembly Features


Once the purpose, method of functioning, and form of the spindle are clearly understood, our technicians begin taking it apart in our HEPA climate-controlled cleanroom designed to prevent contamination. Only complete disassembly is acceptable for repairs, since every piece has to be inspected for a possible role in the original failure.

As the spindle is eventually separated into all of its components, each piece is carefully examined. In many cases, parts are also photographed or scanned digitally. This action functions as a secondary inspection, allowing our technicians to get a closer look at the state of different areas of the spindle. This deeper analysis should shed light on the true cause of the failure, as well as any contributing factors, such as poor design or incorrect application.

Quote & Failure Analysis Report

After we’ve identified potential causes of failure, we’ll send you a Failure Analysis Report (FAR) along with a quote. The FAR outlines a list of all parts that need to be repaired or replaced, projected lead time, and what our ISO-certified technicians found during the initial evaluation. We do not begin any repairs until you’ve reviewed our FAR and accepted your quote.

Cleaning & Repairs

Before we begin repairs, we thoroughly clean each component. After repairs, machining or grinding may be necessary if operating specs require it.


Once all required replacement parts arrive, several technicians work side-by-side to reassemble the spindle with maximum precision. Our team works quickly, but securely, to ensure quality every step of the way. During assembly, they also consult records to make sure that target operation is reached.


After complete parts assembly, it’s time to evaluate functionality. At this point, our technicians analyze spindle performance in normal operation and more extreme conditions. This often means spindle vibration testing and thermal analysis.

Quality Assurance Check & Shipping

Even after our repair technicians have signed off on the spindle, it still has one more stop to make: our quality assurance department. Here, the spindle undergoes a final inspection, and pertinent records are analyzed for precision.

Guarantee Optimal Performance With Help From Superior Spindle

Superior Spindle is an ISO-certified company serving customers throughout North America. We specialize in CNC repairs, rebuilds, and replacements, and can service a wide array of brands. Let us help you take care of your investment—contact us today to get started with a quote.