I have a Mazak H500 (HMC), while ago by start-up the spindle in high gear (2 stage gear box low & high), you could get scare by the spindle noise specially at 2000 rpm above and then without any alarm spindle runs and slow down like the machine is turning off during spindle running.
but by starting from 100 rpm to go above about 1000 rpm, it was with less noise and reasonable spindle sound.
I notice that also by shifting the gear from low gear to high gear manually, the gear box struggling to get in to the high gear.
I checked the gear box, all the gears are OK, the spindle servo unit is OK, the spindle seems is OK and I can rotate the spindle by hand easy, proximity switches are good.
Has any one knowledge or experienced with such problem??? I appreciate any help and recommendation in advance.

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