High-Speed Spindle and Spindle Motor Repair

spindle repair
spindle shaft repair
spindle repair

CNC Machine Spindle Repairs

While Colonial Tool has built a strong reputation on providing reliable new spindles for our customers, we have also earned our stars and banners as being a total solution house. For our customers, this means being a leading spindle repair shop in Michigan and providing specific knowledge on spindle motor repairs, as well as specialized lathe and CNC spindle repairs.

When it comes to the repairing and rebuilding of virtually any type of precision spindle, regardless of the manufacturer, our in-house capabilities with modern, state-of-the-art equipment, combined with the accumulated expertise of our people, are decisive factors that will give you the confidence and assurance of a job well done.

Try us for your next CNC machine spindle repair or rebuild, and we bet you’ll be hooked by our quality and turnaround time.


These are just some of Colonial Tool's satisfied spindle repair customers: Ford, GM, Chrysler, CAT, Cummins, MAG, Comau, Ingersoll Production Equipment, Linamar, Red Viking, Raven Engineering, Cell Con, large and small machine houses and die shops.

Rebuilt spindles are guaranteed for one year from shipment and require the same care as a new spindle. Spindle motor repairs are managed on a case-by-case basis and allow us to provide you with the best machinery and precision available on the market. We thoroughly review the engineering and construction of all CNC machine spindle repairs.


Machine Spindle Repair Process

Here’s how we handle every single spindle repair. Specialty, standard, OEM-specific and completely custom jobs all receive our same excellent standard of care.

1.       Open box and start taking pictures of spindle in box, to see that it was packed correctly, or not

2.       Pre-run the spindle on our test bed to see how the bearings are via IRD Vibration Analysis

3.       Check drawbar pull force, and encoder readings, and/or prox switch readings as you actuate the drawbar, (if there is a drawbar)

4.       Check HSK, or pilot and face TIR prior to dis-assembly (HSK checked with long tooling bar)

5.       Check axial compliance (end play check) prior to disassembly

6.       Disassemble, clean, and inspect all components (take lots of pictures while the spindle is coming apart)

7.       Check motor windings, and internal thermistors with OHMS gauge, and meager, (if it is a motorized spindle).

8.       Check shaft balance on dynamic 2 plane IRD balancing machine

9.       Check HSK taper with Etamic air gauge, and record findings, (if front tooling is HSK)

10.   Check shaft out complete with measuring bearings journals, shoulder, face, and pilot run outs, and pulley run outs.

11.   Check housing bores for size, roundness, taper, etc. and check front to back C/L to base dimensions

12.   Write full Tear Down Report on above findings, and wait for SERVICE ORDER from Spindle Sales

13.   Prep spindle shaft and housing for new bearing installation

14.   Install new front bearings and/or install shaft, and install rear bearings and final lock nut

15.   Pre-check run outs of HSK/Pilot, face and pulley

16.   Complete build and test spindle on test bed at rated RPM

17.   Run Vibration Analysis again, and take all readings

18.   Inspect final run outs as listed above, after run in is completed.

19.   Paint, tag, and box spindle for shipment

Every step in our machine tool spindle repair, CNC spindle repair, high-speed spindle repair, lathe spindle repair and spindle motor repairs are well-documented so you’ll understand what we do and so we can quickly audit our process to prevent harm to your operations.

All machine spindle repairs follow these steps and are fully reviewed before they come back to you.

inspecting spindle
Spindle repairs
machien tool spindle

Colonial Tool precision spindles (formally EX-CELL-O precision spindles) have been providing significant operational efficiency and lifetime savings for our customers.

We took this engineering knowledge and have turned our shop into one of the most competent repair services for our customers for over 80 years. R.A.S. can provide 24-hour, in-house manufacturing and repair spindle personnel to expedite fast, efficient and competent spindle repairs for your emergency situation.

Our experts repair spindles of any operational function with the specific characteristics that you need, even in high-demand requests such as CNC spindle repairs.

Colonial Tool has all the necessary equipment and expertise to service and/or repair any precision spindle on the market today. We know the best practices and engineering principles industry-leading OEMs use, and can replicate or repair your spindles to meet those exacting criteria.

How Machine Spindle Repairs and Spindle Motor Repairs Work

Need a machine spindle repair in Ontario or throughout Michigan? You’ve come to the right place. Contact us, get your quote and ship your spindle to us whenever you’re ready for repairs.

And if you’re having an emergency? Colonial Tool will send a service engineer to the customer's facility when time constraints do not allow the return of the spindle to Colonial Tool.

R.A.S. service is the foundation of our business, which leads to satisfied customers.

Machine Spindle Repair Procedure

i.          Receiving

For our American customers, we have a U.S. drop-off point in Detroit. R.A.S.' Customs department generates the paperwork necessary to bring the spindles into Canada for repair.

A job number is assigned to the spindle and priority assigned based on customer needs. R.A.S. assigns a suffix-“R” to the job numbers of warranty repairs to highlight first priority and assignment of an engineer to coordinate the testing and failure analysis.

ii.         Visual Inspection

Each spindle is given a thorough visual inspection by the spindle service technician to determine degree of failure, by this procedure, namely whether contamination, motor problems, machine impact and possible damage to the spindle envelope.

This allows us to start to understand the damage and initiate proper testing and controls for your high-speed spindle repair.

iii.        Testing

Information is gained by performing service checks with a tenth indicator. Pilot and face TIR runout tests are performed as well as radial load, axial compliance, thermal and axis of rotation tests. Machine tool spindle repair requires precision in the knowledge we gain, which is why Colonial Tool employs some of the best engineers and technicians in Canada.

iv.        Disassemble Unit and Wash

The service technician, working with assembly prints, stock lists and all detail component prints carefully disassembles the precision spindle, making notes on any problems that are found (warranty spindles require engineer observation during this process). Bearings are stored, in sets, within Zip—Lock plastic bags for further inspection if necessary.

Our machine spindle repairs come with a full inventory and audit of the components.

All components, excluding bearings, are thoroughly cleaned of all foreign substances. Some details may require vapour and/or bead blasting to remove any deposits and then are re-washed and blown dry.

We adhere to warranty requirements and industry best practices for your industry, ensuring that your CNC spindle repair or other spindle needs are met, and that units are properly kept in compliance with your needs.

v.          Components Inspection

All component details are inspected against their print tolerances and deviations are noted on the "Spindle Repair Report". Shaft bearing diameters are accurately inspected for roundness; the face, pilot and bearing shoulder are inspected for TIR runout. Bodies are inspected for size, ovality and taper of the bores as well as concentricity of front to back bores are inspected.

vi.         Evaluation of Failure Mode

By this point, the R.A.S. service personnel will have an understanding of why the spindle failed. A description of probable spindle failure is noted by the R.A.S. service technician on the spindle repair report. This report is generated and referenced throughout (for example) the lathe spindle repair process. This ensures we manage each repair or part replacement properly. We have a full suite of tests to confirm success before returning the spindle to you.

vii.        Engineering

Engineering is contacted when the service technician feels that the failure may be due to design flaws and it is the responsibility of engineering to outline improvements. Machine tool spindle repair specialist engineers have seen failures of almost every kind, and have developed a standard practice to create solutions and verify these elements.

viii.       Customer Contact

A formal quotation is generated and a “not to exceed” price is presented to the customer for approval prior to reworking the spindle.

ix.         Reworking and Replacement

Components not within original print tolerances are reworked or replaced (i.e. chroming shafts, sleeving housings). Rotating components are checked for compliance to balance specifications and rebalanced if necessary.

x.          Inspection of Rebuilt Components

Dimensions of all geometric inspections are performed to reworked features and documented to ensure quality.

xi.         Assembly

Assembly of the spindle is comprised of ensuring dimensional integrity of the assembly maintaining pertinent datums and testing the spindle.

xii.        Acceptance and Runoff

The testing of the spindle is complete in accordance to the procedures listed in sections VI.A.5 and VI.B.1 through 3.

xiii.       Identification

The spindles are labelled with important information concerning style, speed and lubrication. Once this is complete, painting of the housing is performed to resist corrosion.

xiv.        Package and Storage

Machine spindle repairs and rebuilt spindles are guaranteed for one year from shipment and require the same care as a new spindle.

Prior to packaging the spindle, a coating of protective oil is placed on machined surfaces to prevent spindles from corroding. Spindles that incorporate liquid cooling should be purged of the cooling medium and replaced with antifreeze during cold temperatures to ensure the housing from cracking.

The spindles are packaged in a wooden box lined with a 1/2 inch thick vibration dampening material which prevents transit vibration from brinnelling the bearings. R.A.S. recommends that the spindle remain in this container until being put in production.

We’ve used these steps to become a spindle repair leader in Ontario, as well as in our southern practice areas, including spindle repair in Michigan. Colonial Tool is your one-stop shop for spindle inspection, maintenance, repair and more.

Contact us now to start the process and learn more about the machining, repairs and custom work we provide.


The VS Sensorik Digital Calibration and Measurement Unit (DCMU) allows for accurate readings of encoder signals. Any type of encoder can be checked with this device but it is best for sine wave encoders. The advantage of this device is that it displays all of the encoder signals simultaneously and this allows us to check that the flag on the target wheel is properly positioned relative to the teeth. In cases where VS Sensorik encoders are used the DCMU allows us to recalibrate the encoder so that the signal amplitudes and offsets are as close to perfect as possible. There are no disadvantages to this device but it is essentially a very easy to use oscilloscope

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spindle repair
spindle repair
spindle VS inspect encoder
spindle VS inspect encoder