Our Blog - See Examples of Spindles We've Repaired

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Welcome to our blog. Here, you'll find examples of spindles we've repaired in the past. We explain what was wrong, have images, videos and more. If you're looking for more specific brand information, or can't find a brand click here, or try the "brands" link above.

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    • GMN TSSV120-60000-5 Spindle Rebuild

    GMN TSSV120-60000-5  Spindle Repair

    This spindle came to us and was needed back at the customers ASAP. We disassembled and inspected the spindle. All critical spindle components passed quality control inspections except the taper that had 4 microns of run out. Additionally, when we checked the customers tooling we found that it had 30 microns of run out. We contacted the customer and it was determined that the tooling would need a kiss grind.

    We kiss ground the tooling, adjusted preload and balanced the spindle. Final quality control showed that the tooling taper now had 3 microns of run out, well within the acceptable range of our customer’s tolerances. The customer had his spindle back within 3 business days. We were able to perform such a quick turn around because we currently employee two certified technicians to run our precision Kellenberger grinders.  

    Written by Sandy Smith

    Categories: Emergency Repair,GMN Spindles,Grinding Spindles,Weapon Manufacturing Industry,Why we ask for tooling

    Sandy @ 12:33 pm


    Mori Seiki NV5000
    Mori Seiki NV5000

    Mori Seiki NV5000

    BIG PLUS Taper
    12,000 rpm
    This spindle was crashed causing damage to the front bearings and the BIG PLUS taper. We needed to grind plate grind the taper to bring it back to manufacturers specifications.
    Our final QC showed we had less than 2 microns run out on a 13 inch BIG PLUS test bar that repeated over 20 tool changes. The only way to achieve this type of accuracy is to have all the required BIG PLUS test tooling and a close working relationship with BIG PLUS.
    Our competition claims to be able to repair BIG PLUS spindles. However, recently we have found several spindles we have had to rebuild after our competition has worked on them because they really have no understanding of the tooling interface and they are not equipped to test the tooling interface. If you need your BIG PLUS spindle repaired always ask the rebuilder if they are certified and for proof they posses the proper test tooling. You will save yourself a lot of aggravation. View Our Mori Seiki Spindle Repair Page Here.
    Categories: BIG PLUS,CNC Machining Industry,CNC Spindles,Milling Spindles,Mori Seiki Spindles,Why we ask for tooling

    Sandy @ 12:24 pm


    Fortuna FIV80R 250.44
    Fortuna FIV80R 250.44

    Fortuna FIV80R 250.44

    Belt driven
    ID grinding spindle
    The cause of failure of this spindle was coolant contamination and a worn tooling taper. We like a piece of our customers tooling with every repair we do. It allows us to do a more comprehensive check on not only the spindle but the influence the tooling mating surfaces may be having on the performance of the spindle.  Our evaluation showed that the customers tooling had worn over time and we recommended replacing the critical wheel holders. Our customer called us after they installed the spindle thanking us for giving them a grinder that performs like it was new.
    Categories: Aerospace Industry,Fortuna Spindles,Grinding Spindles,Why we ask for tooling

    Sandy @ 12:45 pm


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