Originally Posted by
djcregan
Still discussing it with them, they say they are waiting answer from syntec which is delayed due to China’s new year. I don’t understand why it’s a thing to do with syntec but we shall see.
Here is my latest report to them:
“I have carried out some further tests on the new spindle (machine 3) which included using a thermal imaging camera to record the spindle temperature, our findings as follows.
Spindle running @ 20000rpm no load
Highest temperature of spindle is 24 degrees c and does not increase with time.
Spindle running @12000 rpm no load
Temperature increase and overheat signal is initiated within 3 minutes, temperature recorded is 24 degrees c (overheat signal is initiated before further heat is conducted into t he spindle).
Spindle running @ 14000rpm no load
After 20 minutes spindle is still running but temperature has climbed to 40 degrees c. After 25 minutes Spindle speed was increased to 20000rpm and temperature reading taken at 45 minties found to be 29 degrees c.
Conclusion
Spindle speed effects the spindle temperature, the slower the speed the more rapid is the rise in temperature.
At 12000rpm the spindle thermistor signals to the controller that temperature is too hot within only a 2-3 minutes.
At 14000rpm the spindle will run under no load constantly but temperature at 25 minutes is 40 degrees and may still climb further.
At 2000rpm the spindle will run without temperature increase once temperature reaches approx 24 degrees.
Machine 2 running constantly under load is approximately 18 deg c
Machine 1 is similar
So in essence the spindle cannot be used for spindle speeds of 12000 Rpm or less. “
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