stepgen.03.maxvel is too big for current step timings & position-scale, Clipping

Hallo zusammen,

ich verstehe die Meldung nicht ganz, welche Werte sind im Verhältnis zueinander nicht OK und in welchem Verhältnis muss was zueinander stehen, damit es passt?

stepgen.03.maxvel is too big for current step timings & position-scale, Clipping to Max possible

Mesa: 7i95
Joint 3 = Achse Y
Mikroschritte: 1/2 (1zu1 kann mein Treiber nicht)
Motor: 1.8°
Getriebe: 40 zu 1 (Eingangsumdrehungen 40, Ausgangsumdrehungen 1)

Leider ist die Ausgangsgeschwindigkeit zu niedrig, ich würde eine viel höhere Geschwindigkeit benötigen. Allerdings meckert LinuxCNC bei der Anzeige der Maximaldrehzahl (und Warnungen mag ich nicht).

Daher meine Frage, wie bzw. worauf muss ich bei der Konfiguration von Y (Joint 3) achten?

Im Anhang meine aktuelle INI und HAL.

Gruß Mücke

INI
 
HAL
 
 
 

The warning means that you cannot reach the specified joint
maximum velocity with your current step timings, that, you have

STEPLEN = 2500
STEPSPACE = 2500

This means the total step rate can not be greater the 200 KHz
( 1/(StepSpace+StepLen), but your maximum velocity (7200 mm/s !)
times the scaling (44.444)  requires a 320 KHz

Did you really mean 7.2 meters per second maximum Y Velocity?

7.2 m/s is clearly too high.
The exit velocity is very low.

You are right, I could make the scale smaller, then the output speed should be higher.

I can't understand your calculation
1/(step size + step size) * scaling = KHz
1/(2500+2500)*44.444 = I arrive at 0.008888 ?
How do you arrive at 320 KHz?

7200 (mm/s) * 44.444 steps/mm = 320K steps/s

1/(2500e-9+2500e-9) = 200K maximum step rate (2500 is in nanoseconds)

You don't need to change the scale, just reduce the Y/Joint3 max velocity
so something reasonable (HAL axis units are in seconds, not minutes,
did you mean 7.2 Meters per minute? that is 120 mm/s)

I will print out your calculation example and hang it on my info wall, THANK YOU!

I started with 3600mm/s, and the part turns so slowly, so I just increased the number, the only reason was to make it bigger.

The axle should rotate faster.

Not expedient. I could install a smaller dribble (now 40/1).

Yes, that reduction drive does not look appropriate for a linear axis

tommylight wrote:

What does the reduction drive?

I need more strength.
This axle turns a car wheel, it doesn't have to run fast but it would be nice to run a little faster than now.

Picture, the motor with dribble is on the back, I don't have another picture right now.

Calculation:
Corner of travel: 360 mm / revolution
microsteps 1/2 =400 steps per revolution
reduction 40/1 = 16000 steps per revolution

360 mm = 16,000 Steps
1 mm = (1*16,000) / 360 mm
1 mm = 44,4444444 Steps / mm

Why is the calculation wrong?

yes LinuxCNC would like to have a linear axis for the Y axis, but this is round


 

I used 360mm because that is the number of degrees of a circle
The shaft A has a diameter of 5cm (I think, I have to measure it).
The tyre can have a diameter of 40cm to approx. 110cm.

If you ask like that, I would do the dimensioning based on the shaft.
I have tested by hand a speed of about 7mm/second when I want to rotate the tyre under load.

It would be good if I could move the shaft at 7mm/second under load, more than that in rapid traverse.
At the moment I doubt that I can achieve these speeds with this gearbox.