Scaling of axis

For my encoder scale of the z axis. i have turn the servo motor by hand and measer the real distance and compared it to the DRO. so the encoder scale of 500 should be right. If thats the right way to do? The linear encoder doas use indeed a conversion box and will needs some testing. But first i want to get my z-axis right. My only problem is that when i ask to move 10 mm or 5 mm or another distance. My machine is going verry slow and not 2000 mm/min. When i set my output scale lower then the machine goas faster but if i change my P-regulator up, my servo begin to make lot of noise an the machine goes slow again.
So i don't know what the OUTPUT_SCALE does.

So all together
- i can't get the machine to the right speed
- and the regulation of the machine goes difficult

In general you should not change the default output scale or output limits (normally 10, -10,+10)

The only things that normally need to be adjusted for velocity mode servos are:

1. Encoder scale

2. P term

3. FF1 term

4. Maybe FF2

5. You may have to reverse the sign of output scale if the feedback is wrong (you get a runaway)

Have you gone through JTs tuning tutorial?

gnipsel.com/linuxcnc/tuning/servo.html

so there is no need to tune the I or D term?
And i have seen the tutorial but not properly done it.
surtenly many thanks for the help, i will let it know how it went or if i have other problemes

Hi,

I have adjusted a few things, but my servo still make some noise ( i think vibration)
anybody that now what the cause?

Vibration or oscillation?

Try dropping P until you get no Oscillation.

Hi,

First of all thanks for the help,i found the solution to my speed probleme. The servo's can go 2000 rpm. so i have calculated my velocity, so 2000rpm = to 7.33 m/sec.
Now my other problem is that when i jog into the limitswitch on one side ia hit the hard limt and can't jog away from it by pressing the overwrite button. The other side where the homing is there i can jog away.
there is one limitswitch for eatch axis. Can anybody help me find the problem?

Thanks again

You should never hit a limit switch if the machine is properly set up. It is just there for safety.
Reduce the length of the axis in the ini file so you don't hit it. It might only take a mm or so to stop it. happening.

When you have your scale correct in axis you can just measure using the DRO to set your actual travel limits. With your actual travel measured you will set your "soft" limits.

As rodw stated the actual limit switches are used for the "crap" (*^&*@#@) moments They are there to save your hardware.

Find out what your actual travel limits are and set them in your ini file.

MIN_LIMIT = -500
MAX_LIMIT = 500

This is where you set the soft limits of the machine.