Cincinnati 10HC 2500 Get it in gear



CHALLENGE

Cincinnati 10HC 2500, 4000 RPM, oil mist lubrication, gear driven

Our customer employs this spindle from a horizontal machining center in the manufacture of world-class metal cutting and welding equipment. They contacted us because the 2-speed gear-driven spindle was very noisy during operation in the low range, less so in the high range. The bearings were definitely loud when rotated in assembly incoming, and felt worn when rotated after disassembly of the spindle. We also observed that the 45 tooling taper ID was in poor condition with insufficient tool contact, and that the 125mm housing bore was worn oversized and out-of-round despite previous plating and grinding. Additionally, we noted that the tool retention gripper fingers had significant wear and that one drive key was worn while the other was severely damaged.

SOLUTION

We completed a kiss grind of the 45 tooling taper ID, and a grind, chrome plate and finish grind of the 125mm housing bore. We rebuilt the spindle with all new bearings, Bellevilles, grippers, drive keys, gasket, seals, o-rings and assembly screws. We finished this rebuild with our final test run, break-in and final QC. We advised our customer to replace the bearings on any accessible gearbox shafts prior to reinstallation of the spindle.

DETAILED CAUSE OF FAILURE

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