Operational steps

All parts of the spindle are checked for wear and damage according to original manufacturing tolerances and specifications in our production area. We check the runout, alignment, optimal tolerance levels for housing bores as well as the shaft runout and parallelism. We want to get at the origin of the failure so we can get it fixed right and give you guidance on how to prevent future spindle issues.

Bearing contamination is a common cause for spindle failure. We inspect the bearings for preload, contamination, overloading, fretting and overheating. We’ll make a recommendation for replacing your bearings so you can extend spindle life and get better performance from it.

After dismantling and checking we offer a full dismantling and inspection report together with a quotation for your approval prior to any repair.

Following your approval we carry out full cleaning, repair and remedial work required on the spindle, bringing it back to the original maker’s specification. The next step is to get the balance right. We do component balance and then perform final trim balance at maximum RPM to achieve the lowest unbalance and vibration levels possible.

We put it all back together with new bearings, seals, o-rings, spacers and other reworked components. All the components are controlled and cleaned, the encoder is settled through an oscilloscope. To prevent contamination the spindle is reassembled in a temperature-controlled clean room.

After the spindle is assembled we test it. We test it for runout, temperature, vibration, checking the encoder functioning (if present) in closed loop with the inverter SIEMENS SIMODRIVE. We do this work in increments, increasing RPM from zero to the maximum speed to insure that the spindle is properly assembled. At the end of the running test all our spindles / electrospindles have the residual unbalance of  0,2-0,3 mm/sec at the maximum speed.

Every spindle that we rebuild is then put through a redundant final QC process to insure that all of our rebuild processes have been performed properly. We verify the locking system of the tool with a special instrument to check the clamping force, check the control bar rotation at the distance of 300 mm, check  tool change control sensors and other sensors. Only after we are fully satisfied that the spindle has passed all of these tests, it will be returned to the customer, so that you can be confident that the spindle will be in full working order and that all works of the highest quality have been carried out.