Re: [CAD_CAM_EDM_DRO] Re: re: CncPRO top speed limit (more)
Posted by
cnc002@a...
on 2000-12-12 07:15:14 UTC
Ballendo:
No particular order of entry, just changed the parameters as needed. I am
using the latest revision of Version 3.0. One thing I did discover is that
the settings for the Acceleration values needed to be much higher than those
already set in the parameters, otherwise I had really bad oscillation of the
drives and/or they didn't stop at the desired position. Of course, keep in
mind that I am using closed loop Servo drives and the oscillation may have
been because of them and not the software, so it was necessary to make
adjustments to the software to compensate for either the drives and/or the
StarCam boards.
I first measured the distance travelled by the axis with a single turn of the
leadscrew and then, of course, was able to determine how many pulses of the
encoder were needed to move the axis 1.000". Then, I set the program to
output that number of pulses for the 1.000" of travel. It was probably
easier because I did have encoders and knew the number of pulses per
revolution for them and all I had to do was set one pulse out of the program
to one pulse for the encoders and have the StarCam boards interpret one step
pulse to equal one encoder pulse.
What is the step resolution of your stepper motors? I assume you are using
steppers in your application. If they are 0.5 degree then you would have 720
steps per revolution which is over twice what I needed for my application.
And the pitch on most lead screws would not be all that course therefore it
is not at all unlikely that one could need upwards of 2000 steps per inch. I
have not checked to see how high the CncPRO will go as far as steps per inch
since it was well within what I needed.
If your stepper system has a very high resolution and your lead screws or
whatever you are using has a fine pitch, it may be that the software will not
go high enough for your 600 inches per minute. However, it will output a
rather high step count per second/minute and the faster your PC runs the the
more it will output.
Randy
No particular order of entry, just changed the parameters as needed. I am
using the latest revision of Version 3.0. One thing I did discover is that
the settings for the Acceleration values needed to be much higher than those
already set in the parameters, otherwise I had really bad oscillation of the
drives and/or they didn't stop at the desired position. Of course, keep in
mind that I am using closed loop Servo drives and the oscillation may have
been because of them and not the software, so it was necessary to make
adjustments to the software to compensate for either the drives and/or the
StarCam boards.
I first measured the distance travelled by the axis with a single turn of the
leadscrew and then, of course, was able to determine how many pulses of the
encoder were needed to move the axis 1.000". Then, I set the program to
output that number of pulses for the 1.000" of travel. It was probably
easier because I did have encoders and knew the number of pulses per
revolution for them and all I had to do was set one pulse out of the program
to one pulse for the encoders and have the StarCam boards interpret one step
pulse to equal one encoder pulse.
What is the step resolution of your stepper motors? I assume you are using
steppers in your application. If they are 0.5 degree then you would have 720
steps per revolution which is over twice what I needed for my application.
And the pitch on most lead screws would not be all that course therefore it
is not at all unlikely that one could need upwards of 2000 steps per inch. I
have not checked to see how high the CncPRO will go as far as steps per inch
since it was well within what I needed.
If your stepper system has a very high resolution and your lead screws or
whatever you are using has a fine pitch, it may be that the software will not
go high enough for your 600 inches per minute. However, it will output a
rather high step count per second/minute and the faster your PC runs the the
more it will output.
Randy
Discussion Thread
ballendo@y...
2000-12-11 22:26:07 UTC
Re: re: CncPRO top speed limit (more)
cnc002@a...
2000-12-12 07:15:14 UTC
Re: [CAD_CAM_EDM_DRO] Re: re: CncPRO top speed limit (more)