Catastrophic bearing failure was the main cause of this spindle malfunction Continue reading to learn how Northland Tool performed this repair and converted a Weiss GHK 176239 spindle from grease-injected to permanent grease lubrication……Read More
Studer S-20 Spindle Repair
The Studor S-20 Hydrostatic grinder is belt driven and capable of running up to 910 rpm.
We sometimes receive spindles with the drive motors. We always like to run the spindle and motor to test run and evaluate before breaking down. When we received this Studor spindle we also received the motor as it is a whole unit. The spindle was seized however the motor tested and ran fine. The customer was made aware that we would only need to rebuild the spindle. The incoming analysis showed that the drive pulley bearings were seized due to coolant contamination. The drive belt was worn, likely caused from the pulley bearings being seized. The main spindle shaft OD seal surface grooved from seal wear and the ID taper was worn from use and had 6 microns of run out. We also found the bronze bushing for head swivel was egged.
The following actions were performed on this Studer S-20 spindle:
- Grind, chrome plate, and finish grind the main spindle shaft OD seal surface
- Kiss grind the ID taper
- Manufacture a new guide bushing and spacer
- Replace bearings, seals, o-rings, snap ring, belt, and oil sight glass
After reassembly of all components, adjusting bearing preload, and undergoing break-in and testing procedures, this spindle passed our final quality inspection before being returned to our customer with a 1-year warranty.
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In this helpful guide to spindle bearing preload, Northland Tool & Electronics will answer all the basic questions about your spindle bearing preload calculations.Read More