Damn, I just took your ass off moderation! Back you go.
On 7/9/2016 3:30 PM,
maxnc15@...
[CAD_CAM_EDM_DRO] wrote:
?
Jon,?
> Or did you have a drive fail and ruin the stepper,
and you assumed the stall was the cause??
Assumed - all three motors do
not respond - so it could be they work and the driver
board only is bad.
I will try Gecko, thanks.
> Do you know where to
get proportional hydraulic valves? ?They will run
about $5000 new, PER AXIS,
Yes I do know - Sterling which
was bought by Parker sold two sizes for less than $200
each. ?The ones by Moog ran $3000 and another company I
forget the name of was $5000 each. ?I bought some for a
robot project but couldn't afford to finish yet, which
is why I need the CNC to work. ? I also know many other
things posted here. ??
?
Kirk
---In
CAD_CAM_EDM_DRO@...,
wrote :
On
07/09/2016 09:51 AM,
maxnc15@...
[CAD_CAM_EDM_DRO] wrote:
I've had bad luck with my MaxNC mill so
I am looking for
a different drive system. ?Ideally it would
run small
hydraulic motors which won't burn out in an
overload like
steppers.
HUH?? Stalling a stepper will not burn it out.?
The current to a
step motor is constant, set by the driver, and
won't increase when
stalled.? Now, totally crummy step drivers may
blow transistors when
the motor stalls, and that could then damage the
motor with excess
current.? You might try Gecko G251 drives for
smaller motors or the
G203 for larger ones that need more current.? They
will greatly
improve performance, too.
Hydraulics were an insane, Rube Goldberg stopgap
measure when
electronics was in its infancy, and you will not
find any commercial
machines with hydraulically-actuated axes today.?
Putting hydraulic
motors on a desktop mill is one of the most insane
ideas I've ever
heard.? Do you know where to get proportional
hydraulic valves??
They will run about $5000 new, PER AXIS, and you
are not likely to
find used ones, especially in the size you would
need.? You are also
not likely to find hydraulic motors designed for
servo axis use in
the size you want.
Have you actually had a stepper burn out from an
overload?? Or did
you have a drive fail and ruin the stepper, and
you assumed the
stall was the cause?? (I will say the old MaxNC
stepper drives were
QUITE awful, RL-type drives.)? There are much
better drives and
controllers.
Jon
--
Ron Thompson
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