Repair Process

If you are facing any issues with your spindle, our professionals at FISCHER USA will perform the proper analysis to determine the best solution to get your machine running again. Our goal is to return your spindle in a “like new” condition, with the spindle meeting or exceeding the performance specifications it delivered when new. To optimize the repair and accurately determine which components can be reused, and which should be replaced or refurbished, our highly trained professionals combine their many years of hands-on experience with the actual test data from a multitude test benches and measurement devices.  This approach provides you with the optimum balance of both a technically correct solution, and a cost-effective solution.

Our professionals will perform a visual analysis of each part of your spindle, plus additional measurements and tests of the critical components. This detailed analysis not only allows us to determine which components require replacement or refurbishment, but also provides information as to the root cause of the failure. Our detailed repair report will provide information and photos showing the individual components, and recommendations for changes or improvements to your spindle’s installation, settings/adjustments, or manufacturing process, that can help to extend the spindle’s life. For example, recommendations may be to reduce machining vibration, or to correct the bearing lubrication settings.

Our spindle analysis begins with the entry checks, performed with the spindle in the “as received” condition. It is critical to perform these checks and tests to help to determine both the functioning and non-functioning areas, and to try to simulate the same issues that the spindle was experiencing in the machine. Examples of entry checks include shaft run-out values, toolholder clamping force, electrical tests, sensor functionality, and the cooling circuit flow.

After performing the entry checks, the technician begins the careful process of spindle disassembly and component evaluation. This is a step-by-step, level-by-level procedure, with the technician documenting the findings and component condition at each step.

Critical inspections and tests are made on the spindle’s main components, including:

  • Motor components (rotor and stator)
  • Clamping system (drawbar, springs, gripper set)
  • Front-end sealing system (air-passages, seal components)
  • Cooling circuit (housing passages, seal plates, o-rings, aluminum cooling sleeve)
  • Spindle shaft (bearing journals and shaft taper)
  • Spindle housing (bearing bores)
  • Spindle sensor systems (encoder, clamping sensors, vibration sensor, shaft growth sensor, bearing temperature sensors, stator temperature sensors)
  • Unclamping Unit (hydraulic seals, piston)
  • Rear cover (fitting, cables, connectors)

You will receive FISCHER USA’s professional detailed report of the analysis of your Spindle together with a detailed quotation.  Your report and quotation will include the major components recommended to be replaced, the cause of the component’s failure, and recommendations for improvements. After quotation approval, your spindle will follow the same demanding assembly and test procedures as new FISCHER spindles. 

Regardless of spindle make and model the same stringent process is followed. Whether you are in need of a FISCHER, PRECISE or non-FISCHER spindle repair, we welcome the opportunity to serve you.

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