Re: breakout boards plus - hard choice

SNIP
Thank you Jon for a sound analyzes of why closed loop servo systems on
mills are the solution. I'm constantly pushing new materials, cutters,
to try to make a better product for the customer and hopefully a
better $ for me. Where I go there isn't any road signs. Occasionally
other stuff happens and I want to avoid having to try to find the
position the mill is supposed to be to salvage a job. Relevant today
as a fixture fell behind the knee in a job I'd just flipped to do the
other half of (lack of travel required this) The mill faulted out, I
removed the steel block, said damm and carried on. Still made a
perfect part. Thanks Centroid or Ajax or Fanuc etc etc with a true
closed loop system for protecting me from myself. I'm not saying
steppers / open loop systems can't do a good job, but if you want to
push on, you have to at least consider stepping up to a true closed
loop system. Even as a hobbyist, now gone to the dark side, I still
chose a closed loop system.


If you are trying

> different things every day, then to total envelope of possible
> conditions can't be known, that's when I get a little uneasy.
> The only time this is an issue is when some unusual event
> takes place thereby restricting an axis for whatever reason.
> Yes, such as a chip on the ways or screw, bumping into a clamp
> or the vise, etc. You won't always be aware of this happening,
> and so you could have the position knocked off without even
> knowing it. Of course, you can also exceed the grip of your
> work fixture and cause the workpiece to slip and not know it, so
> losing steps isn't the only way to mess up a workpiece.
>
> Jon
>