Mazak MTV-655 Spindle

Mazak MTV-655 Spindle Repair

We received a call from a Machine Tool Repair company in Canada. We have worked with this MTR on several occasions. His customer had a Mazak MTV-655 spindle that the oil system was contaminated. We asked the MTR to make sure that he sent with the spindle the following items, tool holder, retention knob, assembly drawing and parts list.



CHALLENGE

NTE has always had a good relationship with Machine Tool Rebuilders. We received a call from a MTR in Canada. We have worked with this MTR on several occasions. His customer had a Mazak MTV-655 spindle that the oil system was contaminated. We asked the MTR to make sure that he sent with the spindle the following items, tool holder, retention knob, assembly drawing and parts list.

SOLUTION

Once we received the spindle we sent over a report on what we found. The bearings were contaminated. The “TSC” gripper plunger was not functioning and appeared to be bent. The shaft taper had 8µ of run out and the drive dogs (keys) were worn. The MTR needed the spindle quicker than our 5-10 day lead time and opted for the 2-4 day turn with a 25% premium. We rebuilt the spindle with a kiss grind to the taper which was done on our Kellenberger grinder, replaced bearings, oring, bellevilles, ferrules, oil lines. We also machined the drive dog damage.

RESULT

This spindle shipped within 3 days from approval. The MTR installed the spindle at the customer’s facility. The spindle has been running great. Both the customer and the MTR were happy with our quick response to their needs. Having all of the items we asked for with the spindle saved the MTR time and allowed us to balance and final test with the customers tooling.

DETAILED CAUSE OF FAILURE

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