Trigger output per distance moved (Auto Oiler)
13 Oct 2014 08:27 #51990
by pippin88
Trigger output per distance moved (Auto Oiler) was created by pippin88
I've converted my benchtop mill and it's working reasonably. I can never remember to oil it.
So I'm building an oiler with a bunch of pneumatic parts. I'm going to use a peristaltic pump to move the oil.
I see two ways to do this:
1. via LinuxCNC (preferred)
Ideally this would be triggered when a certain distance is moved.
- is this possible?
- I've searched and I can't find a solution
I've got spare outputs on my G540 to drive a relay.
The other possibility is a timer within LinuxCNC, preferably with a separate (priming) event on start
2. Independent of LinuxCNC - arduino (or similar)
In which case I would implement a timer than pumps for x seconds every y minutes
But this results in the same amount of oil if the machine is sitting on doing nothing or if it's moving non-stop.
Has anyone done this?
Can anyone shed any light?
Help is appreciated.
So I'm building an oiler with a bunch of pneumatic parts. I'm going to use a peristaltic pump to move the oil.
I see two ways to do this:
1. via LinuxCNC (preferred)
Ideally this would be triggered when a certain distance is moved.
- is this possible?
- I've searched and I can't find a solution
I've got spare outputs on my G540 to drive a relay.
The other possibility is a timer within LinuxCNC, preferably with a separate (priming) event on start
2. Independent of LinuxCNC - arduino (or similar)
In which case I would implement a timer than pumps for x seconds every y minutes
But this results in the same amount of oil if the machine is sitting on doing nothing or if it's moving non-stop.
Has anyone done this?
Can anyone shed any light?
Help is appreciated.
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13 Oct 2014 13:44 #51995
by emcPT
Replied by emcPT on topic Trigger output per distance moved (Auto Oiler)
We do it with a timer. Like turn it on for 5 seconds in intervals of 10 minutes.
If you find this solution suitable, I can send more details, as I am not near a machine.
If you find this solution suitable, I can send more details, as I am not near a machine.
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13 Oct 2014 15:40 - 14 Oct 2014 16:43 #51999
by ArcEye
Replied by ArcEye on topic Trigger output per distance moved (Auto Oiler)
Hi
There will be a few ways to do this regards distance moved, but probably most readily from a component.
motion.in-position will tell you when a move has stopped
motion.distance-to-go will tell you the distance remaining in a move
www.linuxcnc.org/docs/html/config/emc2hal.html
So if your component uses motion.in-position as a trigger to tell it that a move has begun, it can then add motion.distance-to-go to a cumulative total,
then reset when motion.in-position becomes true again, ready for the next move.
When the cumulative total reaches a preset value, the oiler is switched on, cumulative total reset and off you go again.
Probably need override pins for a reset and on demand oiler activation too.
This is a 'back-of-an-envelope' example of what I mean
It compiles but is not tested. DTG should always be a positive number, irrespective of the direction of movement, so that bit should be fine
Minimum connection requirements, something like:
loadrt oilactivate
addf oilactivate servo-thread
net dtg motion.distance-to-go => oilactivate.distancetogo
net inpos motion.in-position => oilactivate.inposition
net oil oilactivate.oilon => {your-lube-activation-pin}
regards
There will be a few ways to do this regards distance moved, but probably most readily from a component.
motion.in-position will tell you when a move has stopped
motion.distance-to-go will tell you the distance remaining in a move
www.linuxcnc.org/docs/html/config/emc2hal.html
So if your component uses motion.in-position as a trigger to tell it that a move has begun, it can then add motion.distance-to-go to a cumulative total,
then reset when motion.in-position becomes true again, ready for the next move.
When the cumulative total reaches a preset value, the oiler is switched on, cumulative total reset and off you go again.
Probably need override pins for a reset and on demand oiler activation too.
This is a 'back-of-an-envelope' example of what I mean
It compiles but is not tested. DTG should always be a positive number, irrespective of the direction of movement, so that bit should be fine
Minimum connection requirements, something like:
loadrt oilactivate
addf oilactivate servo-thread
net dtg motion.distance-to-go => oilactivate.distancetogo
net inpos motion.in-position => oilactivate.inposition
net oil oilactivate.oilon => {your-lube-activation-pin}
component oilactivate;
pin in bit inposition = 1;
pin in float distancetogo = 0;
pin in bit reset = 0;
pin in bit oilnow = 0;
pin out bit oilon = 0;
// internal variables
variable int progress_level = 0; // switches execution according to state
variable float cumtotal = 0;
// flags to prevent cycling
variable int hasreset = 0;
variable int hasoilnow = 0;
param rw s32 oiltime = 2000;
param rw float disttotal = 30000; // oil every 30 metres of movement for example
variable int delaytime = 0;
option singleton yes;
function _;
author "ArcEye <arceyeATmgwareDOTcoDOTuk>";
license "GPL";
;;
FUNCTION(_)
{
switch (progress_level)
{
case 0: if(!inposition)
{
progress_level = 1;
break;
}
if(oilnow && !hasoilnow)
{
hasoilnow = 1;
progress_level = 3;
break;
}
if(!oilnow && hasoilnow)
hasoilnow = 0; // reset when pin cleared
if(reset && !hasreset)
{
hasreset = 1;
cumtotal = 0;
}
if(!reset && hasreset)
hasreset = 0; // reset when pin cleared
break;
case 1: cumtotal += distancetogo;
progress_level = 2;
break;
case 2: // delay to prevent overrun
if(inposition)
{
if(cumtotal >= disttotal)
progress_level = 3;
else
progress_level = 0;
}
break;
case 3: oilon = 1;
progress_level = 4;
break;
case 4: if(delaytime < oiltime)
{
delaytime++;
break;
}
delaytime = 0;
oilon = 0;
progress_level = 0;
break;
case 30:
break; // should never get here but if we do then loop endlessly doing nothing
default:
progress_level = 30;
rtapi_print_msg(RTAPI_MSG_ERR, "Unsupported state in oilactivate - now disabled ");
}
}regards
Last edit: 14 Oct 2014 16:43 by ArcEye.
The following user(s) said Thank You: andypugh
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13 Oct 2014 17:52 #52014
by pippin88
Replied by pippin88 on topic Trigger output per distance moved (Auto Oiler)
emcPT: I'm interested in seeing your timer implementation. No rush, it will be a while before I can get this done.
ArcEye: Thanks a lot for that. I'll have a look through and try it with a dummy setup at least.
The other possible way that occurred to me is to run the pump very slowly but constantly while motion is occurring. This would be very easy to implement from a software point of view. Then a button or script for priming / initial oiling - preferably prime on startup if hasn't Ben primed for x hours.
ArcEye: Thanks a lot for that. I'll have a look through and try it with a dummy setup at least.
The other possible way that occurred to me is to run the pump very slowly but constantly while motion is occurring. This would be very easy to implement from a software point of view. Then a button or script for priming / initial oiling - preferably prime on startup if hasn't Ben primed for x hours.
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13 Oct 2014 19:37 - 13 Oct 2014 19:42 #52019
by jtc
Replied by jtc on topic Trigger output per distance moved (Auto Oiler)
By emcPT request there is the component(s) that we use:
in the hal file:
and at last in the ini file:
João
/**********************************************************************************************************************
***********************************************************************************************************************/
component spwm "slow pwm";
pin in u32 OnDuty;
pin in u32 OffDuty;
pin in u32 Seconds;
pin out bit Out;
//pin out u32 acc;
variable int time = 0;
variable int acc = 0;
option singleton yes;
function _;
author "jtc";
license "GPL";
;;
#include <rtapi_math.h>
FUNCTION(_)
{
if(Seconds!=time){
time=Seconds;
acc++;
}
if(acc<=OnDuty){
Out=true;
}else{
Out=false;
}
if(acc==(OnDuty+OffDuty)){
acc=0;
}
}
in the hal file:
### Software pwm for lub pump
loadrt spwm
addf spwm servo-thread
### Time component to lub pump
loadrt time count=1
addf time.0 servo-thread
setp time.0.start true
################################### Lub pump #########################
net sec time.0.seconds => spwm.Seconds
setp spwm.OnDuty [lube]OnDuty
setp spwm.OffDuty [lube]OffDuty
setp hm2_5i20.0.gpio.043.is_output true
setp hm2_5i20.0.gpio.043.invert_output true
net LubPump spwm.Out => hm2_5i20.0.gpio.043.out
#########################################################################and at last in the ini file:
[lube]
OnDuty = 2
OffDuty = 1200João
Last edit: 13 Oct 2014 19:42 by jtc.
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