VERY widespread problem. I've done at least a dozen. Ways to prevent this, iv'e found.
High pressure coolant.. the brass din style coolant plungers with the rubber seal on front of the spindle. People don't pay enough attention to those. THEY NEED TO BE REPLACED if they are leaking. No ifs ands or buts about it.
Turn up the oiling cycle VERY slightly for the air mist. There is a small vent hole at the bottom of the spindle. Tape a piece of klenex under this hole and run the spindle for 15 minutes at about 1K. Remove the klenex and see if it has oil on it. No oil, bad JUJU.
Run the spindle for at least 30 seconds after high pressure coolant to help purge the labrynth.
Check your oil cooler and change the fluid AND CLEAN the filter. You don't always notice a problem with these cause there on the back side of the machine.
And my number one reason- shops too lazy to loctite the retention knobs in. In the case of high pressure coolant, coolant will run back up and seep past the drawbar. This will usually only take out the rear bearing and sieze the drawbar.
I installed the very first SH40 in the us btw. I was there through all the SH series.  |