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SPS Spindle Parts & Service, LLC

Spindle Taper Grinding Done Onsite At Your Facility

taper1Now BIG PLUS certified!

SPS Spindle provides an onsite service to restore the precision tool holding taper on your machine tool spindle. Utilizing our custom designed CNC Spindle Taper Grinding system, an SPS technician can grind the taper to your required specification without removing the spindle from the machine. Our onsite taper grinding specialist will be at your facility as quickly as possible. We have all of the necessary skills, taper gauging, and tools to grind advanced CNC spindles and high speed precision spindles with the following tool holding systems.

  • Big Plus®
  • CAT
  • BT
  • HSK
  • NMTB
  • Morse

taper2Our onsite service is available on all horizontal and vertical machining centers. Our comprehensive CNC Spindle Taper Grinding services are backed by over 25 years in the high speed spindle rebuilding industry. We always strive to keep your machine’s downtime to an absolute minimum.

The spindle taper grinding service is performed using the rotation of the spindle shaft within its own bearings.Therefore, it is critical that the condition of the spindle bearings and the complete rotating assembly be good, so that the best results can be achieved.To provide our customers with the most efficient service job, each SPS Onsite Taper Grind customer will be provided with a pre-grind checklist of instructions prior to our arrival.

Our Process


  • Complete spindle inspection prior to taper grinding
    • Vibration analysis
    • Drawbar Retention Force
    • Detailed taper inspection
      • Runout
      • Taper contact
      • Test bar measurements
  • Tooling Inspection
  • Grinder setup
  • Grinding in place of the ID taper
  • Grinding in place of the spindle face (BIG Plus & HSK only)
  • Constant monitoring and measurements taken throughout grinding process
  • Complete quality control inspection after grind
    • Drawbar retention force
    • Detailed taper inspection
      • Runout
      • Taper contact
      • Test bar measurements

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