On Mon, 2008-10-20 at 12:29 -0500, Jon Elson wrote: > Stephen Wille Padnos wrote: > > > > > > You do want to turn the motor power off at some point, but deciding when > > is difficult. Consider a person whose hand is caight between a tool > > (not spinning - no need to be gross here) and a vise. What you want is > > for the pressure on the hand to go away - ie, stop powering the motor > > into the hand. But, you want to be able to drive the axis back a little > > manually, which can't be done if the drive is still commanding a stop > > (or hold). > > > > > Yup, I did that once. Luckily, I had removed the tool from the boring > head, so it was a big flat surface. > But, it pinched several fingers between the boring head and the top of > the vise. I sat there for a moment, trying to decide if the machine or > software had malfunctioned, and I should E-stop and wind the quill up by > hand, or just hit the right button this time. I decided it was human > error, carefully hit the "Page Up" button and got my hand out of there. > Those fingers were sore for a few days. > > Jon
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