Originally Posted by Mudflap  I had a similar problem on my 2001 ML-20. It would just fail to run, or stop and show an error. It's been long enough that I don't remember the error, it may have been E-stop. We couldn't find the problem, we were ready to send the control in to Milltronics for them to repair it to find the problem. It turned out to be a failing microswitch on the chuck safety guard. |
Mudflap: I believe the chuck guard saftey switch does not cause an error message to come up on the screen. I also had to replace the chuck guard safety switch on my client's ML-20 (recently), and it did not cause an error message. BTW, I believe that the chuck guard safety switch broke because of the model selected and the method of mounting (dual-mounted, through 2 thru-holes in the switch
and flange or panel-mount on the plunger actuator).
What's more, I found that it had been attempted to be sealed with blue silicone, and so perhaps was broken previously, I suspect perhaps at the factory. The mounting creates stress from heating & cooling, since different substances expand and contract different amounts when the temperature changes enough. I recommend that the two side mount bolts be left somewhat loose allow some slippage.
I also drilled a 1/8" hole in the cover to allow drainage of seeping coolant
- since this switch works on low voltage the coolant does not hurt it except that over a long period of time it may corrode the internal switch metals - but this will happen anyways as this is not a sealed switch by the switch manufacturer's design!
It allows coolant in by way of the actuator plunger! (And around the switch housing.)