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Northland Tool Blog
Walter DB112005 Spindle Repair
Our customer, a large tooling manufacturer, was experiencing a loud, roaring noise and poor part finish with this double-ended grinding spindle. Our evaluation of the spindle showed that one of the two pairs of ceramic bearings had failed due to contamination with grinding swarf. The grease in those bearings was degraded to a dry powder, providing little or no lubrication. We also determined that the wheel hub tapers on both sides had excessive runout.
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Niigata SPN 40 Spindle Rebuild
Possible cause of failure: Catastrophic failure of #1 and #2 front bearings. Shaft 40 taper is below gauge line. OD of shaft nose has a large dent, drive dogs have light cosmetic wear. Repair action: Clean, inspect overall dimensions. Grind, plate & regrind shaft 40 taper. True bearing spacer shoulders. Replace bearings & o-rings. Adjust preload, balance, assemble and break in. Final quality control inspection.
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Cincinnati Maxim 500 Spindle Rebuild
Possible cause of failure: Bearings noisy from use and contamination. 50 taper worn with low spots. Drawbar force is low. Drive dogs have wear marks. Grippers worn from use. Spanner holes in drawbar nut are galled. Spacers are not square. Recommended action: Clean, inspect overall dimensions. Grind, chrome plate and finish grind the 50 taper. Rework the spanner holes on the drawbar nut. Replace quad set and a pair of bearings, grippers bellevilles, and orings. Grind spacers. Rework the drive dogs. Adjust preload, balance, assemble and break in. Final quality control inspection.
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Topper Spindle Rebuild
Possible cause of failure: Bearing failure from contamination in the front and rear. Rear of spindle covered with dried coolant. Drawbar and bellevilles are extremely rusted, rotary union may have been leaking if being used. Taper is very rusted and pitted, sitting well below gauge line and has 80 microns run out. Spindle nose is equipped with an air purge, but the fitting hole is plugged and not being used. Rear shaft roller journal is 0/-3 (iso is +2/+9) with this bearing set up it should be around +3.5. Drive pulley teeth are showing a lot of wear. Recommended action: Clean, inspect overall dimensions.
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Heald Red Head 405 Spindle Rebuild
Possible cause of failure: All bearings are contaminated. Front and rear shaft journals, shoulder and pilot are not at ISO. Rear pulley taper area and face are marked up. Rear shaft nut is loose, the rear bearing spun on the shaft. Tool and pulley are bent. Recommended action: Clean, inspect overall dimensions. Grind, chrome plate and finish grind the journals and pilot. Kiss grind the shoulders, pulley taper area and face. Replace bearings, pulley, and bolts. Adjust preload, balance, assemble and break in. Final quality control inspection.
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Mitsui Spindle Rebuild
This spindle had been recently rebuilt by someone else before it arrived at NTE. It was running very hot and seizing in our customers machine. The heat was caused by too much grease in the bearings. This condition makes the balls of the bearings “plow” through the grease causing resistance and heat. This heat causes the bearings to expand and eventually the clearance between the balls and raceways disappears. This is when the spindle stops turning. Possible cause of failure: Front bearing #2 feels rough, all bearings have excessive amounts of grease. Journal & housing fits are all within ISO. Taper runout <2µ.
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Hardinge GTA 1353-B Spindle Repair
Possible cause of failure: Shaft nose has heavy rub out damage from being crashed. Id shaft collet taper has 10-12 microns runout. Od is very rough Timing pulley teeth are very worn. Front cover face has wear. Missing the chuck alignment button retention screw. Recommended action: Clean, inspect overall dimensions. Machine front cover. Kiss ID, face and OD taper. We will kiss the OD taper to clean up. Replace bearings, front cover gasket, timing pulley, alignment button retention screw. Adjust preload, balance, assemble and break in. Final quality control inspection.
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Porta N145 FMU Spindle Rebuild
Possible cause of failure: Spindle arrived seized, missing the drawbar assembly. Spindle bearings failed from coolant contamination, grease was washed out and full of rust. Front quill wiper seal was worn out and broken allowing contaminants to wear and score the quill od surface. Quill od measures -7/-35 on the worn area. Shaft tooling taper has severe gauling. Ball screw bearing journal is fretted and undersized by -12/-14 (iso is +/-4). Recommended action: Clean, inspect overall dimensions. Replace bearings, seals, balls and orings. Grind, chrome plate and finish grind the taper. Grind, chrome plate and finish grind the 75mm on ball screw.
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Mori Seiki NV-5000 Spindle Rebuild
The rotor of this spindle had broken loose from the shaft causing end play or axial movement of the shaft. This damaged the #1 bearing oil injector causing an interruption in lubricant flow and ultimately bearing failure. This spindle has a roller bearing at the drive end of the shaft. Northland Tool & Electronics not only provides this bearing but we also set its preload for our customers. This not only makes it easier on the spindle installer it also insures optimum bearing life. Possible cause of failure: Oil jet to the front bearing damaged so no oil was going to the front bearing. Front bearing failure.
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Fanuc Robodrill Spindle Rebuild
Possible cause of failure: Front bearing is worn Taper has 12 microns runout Spindle has been crashed Repair action: Clean, inspect overall dimensions Replace bearings Kiss grind taper Adjust preload, balance, assemble and break in Final quality control inspection…
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