Re: [CAD_CAM_EDM_DRO] Re: Servo hardware

timgoldstein wrote:

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> For me, I could care less about what happens if the servo faults. At that point the part is probably scrap, the tool is ruined, and the setup is likely mucked up. At least this is the result when we fault an axis on the Haas, but it has 2000 lbs of thrust at fault.
>
>

No, not at all. Many times I have had some kind of shutdown that
E-stopped the machine, and did not have to scrap the part or break tooling.
I had a problem a while ago while doing the first rigid tapping project
where my VFD was faulting out. I finally figured out from their cryptic
documentation that it was the "electronic motor overheat" protection
that was being tripped by the frequent spindle reversals. Since the VFD
fault is tied into my E-stop circuit, it E-stopped the machine. When I
finally realized what this fault was, I disabled this feature, as the
huge US Motors spindle motor on my Bridgeport is DESIGNED to do plug
reversing when tapping, and can handle these reversals all day without
straining. But, in all that, I was able to save the tap that was buried
in the hole.

> I agree with you Tom, a fault is telling me I really messed up something and need to reprogram or if the part was sucked out the the vise/fixture that I need to improve my work holding.
>
> What I like about closed loop to the computer is I can hit feed hold at any time and the machine stops immediately. Then to restart just hit the green run button and off it goes with absolutely no loss of position.
>

Yes! I can even hit E-stop, back the machine out by hand, whatever is
needed to save the work and tooling, and then pick right up after.

Jon