Summing up suggestions and summation of my own lengthy battle to fix the problem, '93 vintage.
If your measuring the inside of the taper using an IR tool that's really not bad. I have been up to 180F. 130F seems to be my normal.
If from the machines diagnostic page, that is cooking. The sensing point is against the upper end of the spindle case surrounded by the Z axis casting with no thermal coupling grease [mine has it now]. At this measurement I have seen up to 115F. 105F in a 80F room temp @ 6500rpm for hours is my 'normal'.
As I understand and practice, building up to that temperature is ok, the mass of the unit expands accordingly. Sudden rise by going high speeds cold is bad. This is why race cars have block heater systems.
Summation:
- Always, always run warm up routine from power up or if you need to run over 5k after no spindle use for hour or more
- Check air pressure and oil drop rate [How to in operators manual and Haas website under service]
- Replace air exhaust 'stone' at backside of spindle [this gets clogged, replacing is cheaper than cleaning]
- Change from way oil to Haas recommended 20/30 Mobile 1 waylube [I measured a 15F reduction and no wax buildup]
- Point one or more coolant nozzles at side of spindle [I do this for extended runs 5k and above]
