My hybrid machine will not make my life easy :)
27 May 2014 03:36 #47368
by sigmounte
My hybrid machine will not make my life easy :) was created by sigmounte
Hi , i'm currently making a laser cutting machine .
For the X and Y axis , i already have the mechanics who use servo ( optical encoder + 12 DC motor )
For now it look simple ....
But .. I got my hand on a system for controling the distance from the laser head to the material , professional , precise etc etc
Badly it use a stepper motor for moving the laser head .
Being a total newby with emc2 ( i can use the stepper conf wizard without any problem ) , i will have to create this hybrid conf manually , so here are my questions :
- PmcConf look to be able to make hybrid ( stepper / servo ) configuration , but i need a anything i/o card , they don't look really cheap , anyone have a good plan for an equivalent / clone ?
- Is there somes samples anywhere of hybrid conf ??
Thanks
For the X and Y axis , i already have the mechanics who use servo ( optical encoder + 12 DC motor )
For now it look simple ....
But .. I got my hand on a system for controling the distance from the laser head to the material , professional , precise etc etc
Badly it use a stepper motor for moving the laser head .
Being a total newby with emc2 ( i can use the stepper conf wizard without any problem ) , i will have to create this hybrid conf manually , so here are my questions :
- PmcConf look to be able to make hybrid ( stepper / servo ) configuration , but i need a anything i/o card , they don't look really cheap , anyone have a good plan for an equivalent / clone ?
- Is there somes samples anywhere of hybrid conf ??
Thanks
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27 May 2014 08:29 #47379
by andypugh
Replied by andypugh on topic My hybrid machine will not make my life easy :)
What are you using to control the servos?
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27 May 2014 12:04 #47381
by sigmounte
Replied by sigmounte on topic My hybrid machine will not make my life easy :)
certainly an Hbridge with pwm.capability . but not specific card in mind
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27 May 2014 16:02 #47385
by andypugh
You might be able to use the parallel port, but that doesn't really do fast-enough PWM to drive an H-bridge directly, and there isn't any guarantee of "dead-time" between different channels, so shoot-through is likely if you try to use 6 of them to drive a three-phase bridge directly.
(perhaps there is a good argument for adding a /out channel to the pwmgen with a programmable dead-time)
The base Mesa cards are not horribly expensive, the 7i43 is one way to get a fast PWMgen and/or stepgen from the parallel port and costs $80 and the 5i25 is a PCI card for $90. Both (with the right firmware) can generate H-bridge drive signals directly.
If your drive only needs an analogue control voltage + direction then the p-port and a lowpass filter might be all you need, though.
Replied by andypugh on topic My hybrid machine will not make my life easy :)
certainly an Hbridge with pwm.capability . but not specific card in mind
You might be able to use the parallel port, but that doesn't really do fast-enough PWM to drive an H-bridge directly, and there isn't any guarantee of "dead-time" between different channels, so shoot-through is likely if you try to use 6 of them to drive a three-phase bridge directly.
(perhaps there is a good argument for adding a /out channel to the pwmgen with a programmable dead-time)
The base Mesa cards are not horribly expensive, the 7i43 is one way to get a fast PWMgen and/or stepgen from the parallel port and costs $80 and the 5i25 is a PCI card for $90. Both (with the right firmware) can generate H-bridge drive signals directly.
If your drive only needs an analogue control voltage + direction then the p-port and a lowpass filter might be all you need, though.
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27 May 2014 17:24 #47387
by sigmounte
Replied by sigmounte on topic My hybrid machine will not make my life easy :)
The 5i25 look lot more abordable than the other card , indeed !
So with this card , i can normally have :
- all my limit switch ( 6 )
- 3 analog axis ( pwm output , dir , enable pins from the 5i25 )
- 1-2 step / dir axis
and i will still maybe have some input available for example to use an external control panel ?
From what i understand , the only things that make the pin dedicated to a task are the daughter board ?
So normaly if i create a daughter board myself , i can under linuxcnc ( and i really hope under pmcconf ) configure each pin to what i want ?
Thanks a lot for your answers !
So with this card , i can normally have :
- all my limit switch ( 6 )
- 3 analog axis ( pwm output , dir , enable pins from the 5i25 )
- 1-2 step / dir axis
and i will still maybe have some input available for example to use an external control panel ?
From what i understand , the only things that make the pin dedicated to a task are the daughter board ?
So normaly if i create a daughter board myself , i can under linuxcnc ( and i really hope under pmcconf ) configure each pin to what i want ?
Thanks a lot for your answers !
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27 May 2014 17:56 #47392
by andypugh
Possibly. The 5i25 has 17 pins on the external header and 17 on the internal one.
With the daughter-cards the stepgen and encoder pins connect straight through to the FPGA on the 5i25, but the general purpose IO is serially-addressed.
The 7i77 config uses serial for the analogue outputs too, rather than PWM. I think you would need to ask Mesa if there are any standard firmwares than provide PWM on header pins.
The 5i23 is more expensive, but does offer many more directly-connected pins. This firmware:
git.linuxcnc.org/gitweb?p=hostmot2-firmw...b36da8b888e5b7ac3850
Has encoders, PWMs and steppers all on the same firmware (unused stepgen pins can be used as GPIO)
Replied by andypugh on topic My hybrid machine will not make my life easy :)
The 5i25 look lot more abordable than the other card , indeed !
So with this card , i can normally have :
- all my limit switch ( 6 )
- 3 analog axis ( pwm output , dir , enable pins from the 5i25 )
- 1-2 step / dir axis
and i will still maybe have some input available for example to use an external control panel ?
Possibly. The 5i25 has 17 pins on the external header and 17 on the internal one.
With the daughter-cards the stepgen and encoder pins connect straight through to the FPGA on the 5i25, but the general purpose IO is serially-addressed.
The 7i77 config uses serial for the analogue outputs too, rather than PWM. I think you would need to ask Mesa if there are any standard firmwares than provide PWM on header pins.
The 5i23 is more expensive, but does offer many more directly-connected pins. This firmware:
git.linuxcnc.org/gitweb?p=hostmot2-firmw...b36da8b888e5b7ac3850
Has encoders, PWMs and steppers all on the same firmware (unused stepgen pins can be used as GPIO)
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27 May 2014 17:59 #47393
by andypugh
Replied by andypugh on topic My hybrid machine will not make my life easy :)
I just noticed the 5i24 is much cheaper than the 5i23, and I _think_ it can use the same firmwares, but you would need to check with Mesa.
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27 May 2014 19:20 #47394
by sigmounte
Replied by sigmounte on topic My hybrid machine will not make my life easy :)
Hi , i've found a L298 breakout board , so i'll have PWM/direction input for two motors . look good
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27 May 2014 23:21 #47409
by PCW
Replied by PCW on topic My hybrid machine will not make my life easy :)
There are some PWM+ encoder configs for the 5I25 but I think they all are made for the 7I85S
daughtercard.
Its not a big deal to make a new FPGA configuration with a specific pinout but this does have to be done at the FPGA source code level, that is its not something you can do in HAL.
If you have a pinout list I can make a new configuration for you
daughtercard.
Its not a big deal to make a new FPGA configuration with a specific pinout but this does have to be done at the FPGA source code level, that is its not something you can do in HAL.
If you have a pinout list I can make a new configuration for you
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28 May 2014 01:16 #47415
by sigmounte
Replied by sigmounte on topic My hybrid machine will not make my life easy :)
wow thanks thanks a lot !!
What kind of information do you need ?
What kind of information do you need ?
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