2-speed spindle configuration - help

Jaro
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5 years 7 months ago #201109 by Jaro

2-speed spindle configuration - help was created by Jaro

Good day.
I want to ask you for advice (I don't even know if it's possible), but linuxcnc is very good to bend.
I have two spindle speeds on my mil, which I change manually.
1. 400-4000rpm
2. 10-400rpm
the spindle is controlled by VFD 0-10V.
encoder 2048 pulses / rev
open loop
I would like the software to control the drive based on the required speed in two stages.
I tried to generate some configuration via PNCConf, but it doesn't work for me.
if I enter the G0 S300 M3 display and the spindle is switched to low speed, everything works correctly.
if I enter the display G0 S1000 M3 and the spindle is switched to high speed, its speed is 4000rpm

I thought linuxcnc would recognize the required speeds and drive VFD accordingly.

can anyone advise me how this is solvable. I tried to watch the older posts, but I wasn't wiser.
I am adding .ini and .hal (I apologize for the chaos, but I still did not get to clear both files).
linuxcnc 2.7.15
Thanks for help.

Jaro

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andypugh
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5 years 7 months ago #201115 by andypugh

Replied by andypugh on topic 2-speed spindle configuration - help

Is your gear selection electronic or manual?

My lathe has a 2-speed gearbox with electromagentic clutches and I control it with this custom hal component:

Code:

component gearchoice "A component to choose spindle gears according to spindle speed";
pin in float speed-command;
pin in bit spindle-on;
pin in bit manual-low;
pin in bit manual-high;
pin in bit brake-enable;
pin out float motor-speed;
pin out bit low-gear;
pin out bit high-gear;
pin out bit brake;
param rw float low-ratio=3;
param rw float high-ratio=1;
param rw float max-low = 500;

author "andy pugh";
license "GPL";
function _;

;;

FUNCTION(_){
    static int old_M3;

    if (spindle_on) {
        if (!old_M3){ // spindle off to on transition
            if (manual_high) {
                high_gear = 1;
                low_gear = 0;
                brake = 0;
            }
            else if (manual_low){
                high_gear = 0;
                low_gear = 1;
                brake = 0;
            } else if (speed_command <= max_low){
                high_gear = 0;
                low_gear = 1;
                brake = 0;
            } else {
                high_gear = 1;
                low_gear = 0;
                brake = 0;
            }
        }
    } else { //spindle off
        high_gear = 0;
        low_gear = 0;
        brake = brake_enable;
    }
        
    old_M3 = spindle_on;

    if (high_gear){
        motor_speed = speed_command * high_ratio;
    } else if (low_gear){
        motor_speed = speed_command * low_ratio;
    }
}

(Actually that isn't quite true as I have now modified that component to allow spindle-on gearchanges during G0 moves. But that wouldn't be necessary for a mill)

Note that the .comp is intended for a system with a 3-position high-low-auto switch for the gear ratio and a brake auto-off switch too.

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Jaro
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5 years 7 months ago #201117 by Jaro

Replied by Jaro on topic 2-speed spindle configuration - help

Thank you Andy.

manual switching and I don't even have a sensor there.
there is only "low" and "high" speed position.
the point is that if I work with speeds up to 450rpm, I know that I need to manually switch the lever to the lower position, when I work with speeds above 450rpm to the upper position.
so far I haven't had a spindle speed scanner (actually a speedometer).
today I mounted a spindle encoder.
until now, I have worked by manually rewriting the spindle speed in .ngc.
for example, I wanted to drill at 400rpm, so I had to write about 3200rpm, because when the gear was switched to the "low speed" position, I actually got 400rpm at this speed.
therefore, I was interested in whether it is possible to solve this problem with respect to VFD on the basis of the required speeds.
it is essentially a matter of, for example:
G0 S400 (lever in low speed position) => 9.2V VFD
G0 S3200 (lever in high speed position) => 9.2V VFD

I thought this was exactly the "Range 1 Max RPM" and "Range 2 Max RPM" in Pncconf.

Jaro

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RotarySMP
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5 years 7 months ago #201144 by RotarySMP

Replied by RotarySMP on topic 2-speed spindle configuration - help

Hi Andy, how does it deal with speed changes across the switching threshold due to CSS facing cuts?
Mark

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andypugh
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5 years 7 months ago #201146 by andypugh

Replied by andypugh on topic 2-speed spindle configuration - help

Jaro wrote: manual switching and I don't even have a sensor there.
there is only "low" and "high" speed position.

My mill has 8 gears and no sensors, so I have the system work out for itself which gear it is in.

forum.linuxcnc.org/47-hal-examples/27071...gear-detection#39583

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andypugh
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5 years 7 months ago #201147 by andypugh

Replied by andypugh on topic 2-speed spindle configuration - help

RotarySMP wrote: Hi Andy, how does it deal with speed changes across the switching threshold due to CSS facing cuts?

The changes I made were actually to handle CSS.

The idea is that it waits for a G0 move, de-asserts spindle-at-speed (causing a pause at the next G1) and then tries to match motor speed and gearbox speed on-the-fly (like double de-clutching a car) and then engages the clutch.

In practice, it has exactly the same problem as our 1916 fire engine on a hill, you can't change up because the spindle slows faster than the motor.

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Jaro
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5 years 7 months ago #201203 by Jaro

Replied by Jaro on topic 2-speed spindle configuration - help

Thank you Andy.
today I tried to break up your "gearchange.comp"
by
www.forum.linuxcnc.org/10-advanced-confi...-configuring?start=0

can you advise me on configuration.
I do not use hy_vfd (huanyang vfd).
what to replace:

loadusr -W hy_vfd -d /dev/ttyUSB0

net spindle-at-speed hy_vfd.spindle-at-speed

net machine.on.delayed hy_vfd.enable

net spindle-enable hy_vfd.spindle-on gearchange.0.spindle-on
net spindle-cw hy_vfd.spindle-forward
net spindle-ccw hy_vfd.spindle-reverse

well thank you
Jaro

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andypugh
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5 years 7 months ago #201253 by andypugh

Replied by andypugh on topic 2-speed spindle configuration - help

It's hard to say, as I have no idea what your spindle control pins are called. But use what you have.

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Jaro
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5 years 7 months ago #201322 by Jaro

Replied by Jaro on topic 2-speed spindle configuration - help

It's done

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J Green
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5 years 7 months ago #201338 by J Green

Replied by J Green on topic 2-speed spindle configuration - help

Hope "it's done" means you got the 2 speed transmission wording !
If so would you share your newer HAL an INI files ?
Thank's

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