Help please !!! Servo configuration with stepconf.

with
"gzip -c /dev/urandom > /dev/null"
I am getting
Servo Max jitter = 16350
Base max jitter = 19001

Encoder is 2500 C/T

I am running it with electronic gearing disabled.

Thanks ! it's basic and useful knowledge.

So then I should put 10000 in motor step per revolution at axis configuration window.

But should I put the driver micro-stepping ratio in wizard when I use drives electronic gear ?

Most annoying queries for me is at "Basic Machine Configuration" page where it's asking "step time" , " step space" , "direction hold" and " direction setup". I don't know how to calculate these numbers.

BigJohnT wrote:

According to your manual the Maximum Input Pulse Frequency is 500KHz. I'm not good with KHz and I assume that is minimum of both the on and off time of a step.

It means a billion divide by 500k = 2000 is it a correct number for step time ? I hope so.

Yes ! I have confirmed. It's total 2 microseconds (2000ns) for an entire pulse frequency. We just have to divide in two for step time and step space. It means 1000 for "step time" and 1000 for "step space" THANKS JOHN !

Can anyone explain about what is actually "Direction Hold" and "Direction Setup" ?

Probably not all that relevant with that drive. But a you always stop before changing direction, it doesn't matter too much. 20,000 ought to be safe.

Thanks !
Now I think I have all the numbers needed to run my machine with servo and step/dir with stepconf.

Step Time = 1000
Step Space = 1000
Direction hold = 20000
Direction setup = 20000
Step/Revolution = 10000
Drive Microstepping = ??? (oops! one thing still to understand.)
Pully teeth = 1:1
Lead-screw pitch = 5mm
Maximum Velocity = 1
Maximum Acceleration = 25000/10000*5 = 12.5mm per sec * electronic gear ratio.

One good news is that I can run my servo's with stepconf wizard as an open loop system. Every axis is tuned and responding accordingly, smoothly and fast as well. One thing is cleared in which I was confused that Drive Microstepping means Linuxcnc's internal microstepping and it doesn't care about drives electronic gearing system. I don't know how to tell linuxcnc about drives gearing. so it can calculate position accordingly and we can ramp up the speed with the help of drive's processor as well.

I found an indirect solution is to divide screw pitch according to drives gearing ratio. But I think there should be any direct solution.

Right now I have just jogged and tuned the servo with stepconf because I have only two servo drives expansion board in my hand.