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Northland Tool & Electronics was recently invited to the Hardinge Machine Technology Show 2014 in Elmira, NY where we exhibited as a Technology Partner.

Our customer, a large tooling manufacturer, was experiencing a loud, roaring noise and poor part finish with this double-ended grinding spindle.

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.

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.

Possible cause of failure: Bearing failure from contamination in the front and rear. Rear of spindle covered with dried coolant.

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.

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.

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.

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.

The rotor of this spindle had broken loose from the shaft causing end play or axial movement of the shaft.