Cincinnati T-35, 4000 RPM, oil mist lubrication, belt driven Our customer asked us to modify the shaft of this horizontal machining center spindle during the rebuild process. This manufacturer of aerospace components uses two types of dual-contact tooling: BIG–PLUS® from BIG KAISER Precision Tooling, as well as SimulFit® from Parlec. For those who are unfamiliar, BIG–PLUS® is a spindle system that provides dual contact between…Read More
Possible cause of failure: Rear roller bearing failed, inner race cracked & spun on the shaft, scoring the rear roller journal OD. Rear hydraulic nut failed & came loose, OD rubbed out with bearing spacer. Oil inlet holes were stripped out from previous spindle rebuilder Shaft tooling taper has acceptable runout but is very bumpy with poor tool contact. Front housing ID is oversized +16/+18µ (ISO is…Read More
Famu PHS-912 FIVE Gruppo Parpas Fischer TF2 ST “Evolution 500” two axis milling head 40000 RPM, stator drive, grease lubrication, HSK32 tool interface This two-axis milling head was factory-installed on a Famu PHS-912 FIVE machine by the Italian manufacturer Gruppo Parpas. Our customer indicated that a coolant component had failed, flooding the spindle which caused the drive to trip the machine off. Our inspection showed…Read More
Mazak VTC-20, 8000 RPM, coupling drive, grease lubrication, CT40 taper Our customer indicated that this spindle would occasionally make a banging noise while in operation. When we broke the spindle down for evaluation, we observed that the grease in the spindle bearings was partially washed out by coolant contamination. But the root cause of failure was loss of preload of the bearings which occurred when…Read More
GMN TSSV-120, 42,000 RPM motorized grinding spindle, oil/air mist lubrication, quill pilot This spindle had axial end play incoming, indicating a loss of preload. The shaft tooling pilot had very high runout (>36µ) and the pilot face was chipped. Our internal evaluation showed contamination with grinding swarf. Also, the rear ID of the main housing where the ball cage locates was egged & oversized with…Read More
Matsuura MAM72-25V grease lubrication, coupling drive, 15,000 rpm This spindle came to us and customer stated that the spindle had severe vibration but no tool retention issues. Incoming test showed the drawbar force was low and the bearings were very rough. The spindle was disassembled. We found catastrophic failure of the front bearing, front housing where the #2 bearing sits was oversized and fretted. This…Read More
Weiss, 15000 RPM, CAT-40, grease injection bearing lubrication, stator drive Installed in a Hardinge Bridgeport XR500 5AX (5-axis vertical machining center) When our customer first contacted us about this spindle, they were limiting the spindle speed to 4-5000 RPM because it was emitting a loud, high-pitched squeal if run any faster. A week later, they were unable to go past 1000 RPM without it screaming,…Read More
Northland Tool & Electronics has worked closely with our customer, a large automobile manufacturer, for over 20 years maintaining the spindles in their Ingersoll machines. Our customer incorporates a progressive predictive maintenance program in their facility and Northland Tool is encouraged to provide input on spindle failures and corrective actions. Our customer contacted Ingersoll and Northland Tool to review this information and determined it would be cost…Read More
Hardinge 10,000 rpm spindle
A returning customer called us about a spindle. After two years of running the spindle started to make a high pitched noise. The customers machine tool repairman went in and told them it was belt noise. The customer adjusted belts and the spindle was quiet again. They called in a month later and the spindle was no longer running. The customer sent the spindle in for evaluation.
GMN TS70X115, 10000 RPM, grease bearing lubrication, belt drive
This double-ended grinding spindle was making noise in the customer’s Walter grinding machine so they sent it in for evaluation & quoting. They stated that they were interested in an expedited turn time as they do not stock spare spindles for their grinding machines.