2088
« on: April 08, 2013, 06:30:49 AM »
10K,
You never answred my question which was , "What do you want to do?"
Seems like you want to increase you max velocity?
First find your approx Max velocity.
Run the driver test and find the max Kernal Speed, but would suggest you just start with 25Khz.
Set your max velocity for say 10 ipm with an acceleration of say 2. Now double the velocity ie, 10, 20, 40, 80, 160 ad see where the axis skips.
Lets say it skipped at 80 ipm, then set the velocity at 60 and see if it skips, if it dosen't, now start increasing the accel and find where it skips, lets say it
skips at 60 ipm and accel of 10. Now lower the velocity to 30 to 40 % of max and retest. Above will quickly get you in the ballpark.
Please understand that relibalility of is more important than speed. You don't want the system to skip or have problems when maching.
In general you need to understand the following:
- A stepper motors torque decreases as speed increases. Thus high motor speed and no torque is rather useless. What you want is power which
is torque x speed.
- The SYSTEM must be capable of what you want to do, there are comprimises that will need to be made, speed / acceleration / accuracy /
power and additionaly, adequate drive, power supply, mechanics of the axis, etc. Don't forget that the computer / external motion device must have the
ability to deliver the pulse signal to the drive.
- Thus your have a the software that controls the motion, a computer that outputs the instructions, a drive that delivers the pulse train, the ,mechanics of
the axis, the motor that needs to be able to respond. That is the "SYSTEM". The components are all interlinked and and the system needs to be adequte
for what you want to do. Changes to any part of the system can affect the axis motion.
- And in the end what really matters that the system is realiable and accurate enough to do what you want to do.
SO what do you want to do?
RICH
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