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Repair Process

Repair and Rebuild Process for Spindles

The PDS repair and rebuild process begins after we receive your metalworking spindle and perform our inspection and diagnostic evaluation. Once the inspection is completed, PDS will prepare a repair quote, review it with you and ask for your approval to proceed.

The steps of our repair process are:

Check In

You will be notified as soon as PDS receives your spindle for repair. We will inspect the shipping container for damage. If damage is found it will be reported to you. Once your spindle is unpacked, the spindle is photographed and any physical damage documented. Any unusual damage will be reported.


The spindle will be carefully disassembled, searching for evidence of why the spindle failed. The exterior of the spindle will be cleaned, and the overall condition of the spindle documented.

Evaluation and Customer Quote

Once all of the documents are reviewed by PDS, a detailed Customer Repair Quote is prepared. The quote will include our root cause failure analysis of why and what we believe caused the failure and what repairs and replacement components may be needed to return the spindle to factory specifications. It will also include our estimate of the time and cost to make the repairs.

PDS will send you a copy of the Customer Repair Quote and contact you to review it with you. We will then need your “approval to proceed”. Upon approval, the spindle repair will be completed. After reviewing our repair quote, should you decide not to have your spindle repaired, we will box up all the parts and return them to you, or scrap the unit – your choice. Shipping cost to return the un-repaired spindle will be at the customer’s expense.

Repair and Assembly

All parts are thoroughly cleaned and inspected. All defective parts are replaced to return your spindle to meet or exceed OEM specifications. The dynamic balance of the spindle shaft is inspected and re-balanced. If new parts are not available, are obsolete, or no longer made, PDS has the capability to re-manufacture key component parts. This information will be documented in the spindle repair quote for your consideration.

The spindle is reassembled to OEM specification in a clean-room environment. If required, fitting preload spacers will be reground, and bearings and seals replaced. Rotating assemblies are measured for run-out and dynamic balance. If the spindle has a tool retention system, utilizing an arbor, collet or power-drawbar, it will be inspected and tested for correct operation, tool retention, run-out and dynamic balance.


All spindle repairs go through a run-in procedure using a sign-off checklist for each step of the process. The results of each step are documented. A break-in ramp-up cycle is used to ensure proper operation. Spindle temperatures are measured to ensure proper fits and to ensure the spindle operates to OEM specifications. The checklist is reviewed and each step and result of the run-off procedure is approved by the quality inspector, registered in our document files and signed-off before the repair is complete.

Check Out

The spindle is moved to the staging shipping area. All spindle documentation and any parts or tooling provided by the customer are collected for return to the customer. If the exterior of the spindle was painted, it will be repainted to a close match to the color received.

The last step of the process is final sign-off by a quality inspector. A copy of sign-off checklist, specifications, and warranty card will be shipped back to the customer. The spindle is protected and packed for return shipment to the customer.

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