IIRC - some years ago there was some talk about limiting force on
each axis or the x,y vector.
I don't think it is easy to do but something to think about. I have
no idea how much difference there
is between the forces for a 'good' cutter and a cutter on the edge
of going bad.
Something for someone with time on their hands to experiment with. ;-)
Dave
On Feb 10, 2008, at 9:15 PM, Stan Blosser wrote:
I'm not an expert on AC servos (or servos at all for that matter)
but I suppose the same tecnique could be used to measure torque on
nearly any motor, but keep in mind it is an offline process. This
is not something done directly by EMC or the motor controller.
The setup for my measurements:
The stepper motor mounted on a bar suspended several feet above the
floor. A 1.5" diameter pulley mounted to the shaft. A string
wraps around the pulley and goes down to a basket for holding weights.
My method for measuring torque went like this:
Set EMC to a very low jog rate. Initially about 1 inch/minute.
Load a basket with with weight.
Jog EMC so that it runs the stepper, which like a winch, lifts the
basket.
If everything works fine, jog in the other direction to return the
basket to the floor.
Continue to load the basket and jog until the stepper mis-steps
once fully accelerated.
Upon failure, note the weight and jog rate (which gives me the
values for the table on my site).
Remove some weight from the basket.
Increase the jog rate, attempt to lift the basket, and continue
increasing the jog rate until the stepper mis-steps.
Upon failure, note the weight and last successful jog rate.
Remove more weight and repeat the process.
Like I said, this is an offline process though. It is meant to be
a method for approximating certain design variables, rather than as
feedback for an active system.
[EMAIL PROTECTED] wrote:
Hi
Can you measure torque on AC servo motor?
Can I put that if torque exceed some certain level STOP machine or
go to
feed hold mode. It is very important because torque can directly show
condition of cutter. If can stop machine when torque start
increase I may
or better will prevent break of cutter.
I think in program need be include variable that limits maximum
torque to
axis.
I am interesting in your work and let me know if it can be used
with AC
servomotors?
Thank you
aram
Doh! Of course, a link to my site would help:
http://www.theblossers.net/index.php?section=15
Stan Blosser wrote:
I just posted a blog article on my site regarding my recent stepper
torque measurement project. Not directly relating to EMC, but I
felt
it relevant enough to share here. :-)
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