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  • snowgoer540
  • snowgoer540's Avatar
15 Sep 2024 05:53
Replied by snowgoer540 on topic Showstopper Plasma Cutter retrofit

Showstopper Plasma Cutter retrofit

Category: Show Your Stuff

Yes it is and that is unfortunate as the probing is done twice every time at very low speeds.
I am beating a dead horse, as i have insisted from the very start of PlasmaC that should not be implemented at all, only a single probe.
On a plate with over 200 pierces, probing time is in hours, no matter how fast the Z axis is.


I've seen you say this numerous times on the forum. This has to be a setting/config issue on your part. In an effort to hopefully put the "they didnt listen to me" part of this to bed, I made a video this evening while I was cleaning up the garage. It shows QtPlasmaC (using the PlasmaC component) doing 2,400 probes. Not a single one of them double probed, and it should be noted that all 2,400 probes were completed in ~1 hour.



It should also be noted that I made Cut Height and Pierce Height equal so it didn't look like there was an extra probing move.

I should also note that when the heights/settings are wrong, probing does take longer.

It is probably an incorrect setting, my table only probes once.


X2, I agree.
  • snowgoer540
  • snowgoer540's Avatar
15 Sep 2024 05:49
Replied by snowgoer540 on topic Showstopper Plasma Cutter retrofit

Showstopper Plasma Cutter retrofit

Category: Show Your Stuff

Yes it is usable.
When it let's me use ohmic probing it is working great.
It's a lot faster than the float switch, doesn't put pressure on any adjustments, and it doesn't push the material down. It seems like a much more accurate measure for pierce height.


Deleting the var file was a placebo. When you receive that error, it's because the ohmic probe tripped prior to reaching probe height. Generally speaking, this is due to either the torch being wet, a piece of slag completing the circuit, or in the case of my Powermax 65XP, when I used the THCAD Ohmic sensing the voltage used to accumulate for no apparent reason (though I was told this is impossible (by those without a Hypertherm)). After months of testing, I did away with THCAD ohmic sensing in favor of a few diodes, relays, and a resistor or two which sounds complicated but is much cheaper and easier to implement and has required 0 dickering, I can find a post with the diagram if you're interested. You can decrease the sensitivity of the THCAD ohmic by adding resistor(s), but ultimately I still had the issue of the accumulating voltage. You can plot this and see if it might be your issue using HALSCOPE. After a few cuts my voltage would hover near the trip voltage even when the torch wasn't wet.
  • rebelx
  • rebelx
15 Sep 2024 04:49 - 15 Sep 2024 10:19
Replied by rebelx on topic LMDE6 or Mint 22 ??

LMDE6 or Mint 22 ??

Category: Installing LinuxCNC

Need to do more testing.
  • spumco
  • spumco
15 Sep 2024 02:55
Replied by spumco on topic What do you really get for a $350 desk top engraver ?

What do you really get for a $350 desk top engraver ?

Category: Show Your Stuff

I think if you run the same toolpath at the same RPM but lower feedrate - i.e lower feed per tooth - you'll be able nail down whether the pattern is mechanical or motor/software.

If the pattern is the same - same 'pitch' - then it's probably the belt system that's causing it.  Either from the belt pitch, and you've got mechanical 'noise' from the pulley teeth, or you're seeing peaks/valleys from belt resiliance as it stretches and snaps back in to the cut.

That, plus flexibility in other components, will result in chatter and surface finish issues.
  • phillc54
  • phillc54's Avatar
14 Sep 2024 23:30
Replied by phillc54 on topic Showstopper Plasma Cutter retrofit

Showstopper Plasma Cutter retrofit

Category: Show Your Stuff

Yes it is and that is unfortunate as the probing is done twice every time at very low speeds.
I am beating a dead horse, as i have insisted from the very start of PlasmaC that should not be implemented at all, only a single probe.
On a plate with over 200 pierces, probing time is in hours, no matter how fast the Z axis is.


It is probably an incorrect setting, my table only probes once.
  • CORBETT
  • CORBETT's Avatar
14 Sep 2024 23:28
Replied by CORBETT on topic EtherCAT Communication Issues, Lost Frames, Interruptions in Program Execution

EtherCAT Communication Issues, Lost Frames, Interruptions in Program Execution

Category: EtherCAT

@Rod

Yeah I agree, I hadn't went to the RTAI site in a long time and wasn't sure if by chance it had gone mainstream.  I checked earlier and no, it's still the task of compiling.  So, yeah you are right about the debs.

It really comes down to if he can get PREEMPT working or if he has to go with RTAI.  If RTAI, then it will be a not so fun source build... those kernel modules suck to deal with if they don't install right off.
  • hmnijp
  • hmnijp
14 Sep 2024 22:43
Replied by hmnijp on topic Problems with Lichuan Ethercat servo drive

Problems with Lichuan Ethercat servo drive

Category: EtherCAT

This is my full configuration. Please note this is for a hobby machine and I cannot take responsibility for any present or not present safety features. Use at your own risk.

Slave 0 is the Cat IO board which can be found on Aliexpress.
Slave 1 is a DVS 1.8 kW servo motor with 23 bit absolute encoder, which I am using as spindle. I have set the encoder to 17 bit incremental at the moment. The same XML configuration as for the Lichuan servos works for this one as well.
Slaves 2-4 are the Lichuan servos for my three axes.

I was having issues using the Lichuans in csp mode, due to quite a substantial following error. For this reason I have set them to csv mode. This way I was able to do some PID tuning and clamping down the error to a few microns. I was also playing arround with the parameters on the servo drives directly to improve on the following error further. Most parameters did not do a lot in my case. However, P08.15 "Load inertia ratio" helped a lot. For the axes X and Y I have currently set it to about 12 and for Z-axis to about 7.
 


i looked at your config and saw some errors: addf for all functions must be configured in the correct
сomponent execution order.(read, calculation functions, write). but in your config addf pid functions are executed after new data is already sent to ethercat (addf write...) thus you create a delay of several servo cycles...
the same applies to the rest of the addf. (motion, estope.. etc)
addf lcec.read-all servo-thread
addf cia402.0.read-all servo-thread
....
addf motion-command-handler servo-thread
addf motion-controller servo-thread
....
addf pid.x.do-pid-calcs       servo-thread
....
addf cia402.0.write-all servo-thread
addf lcec.write-all servo-thread
  • machinedude
  • machinedude's Avatar
14 Sep 2024 22:00
Replied by machinedude on topic What do you really get for a $350 desk top engraver ?

What do you really get for a $350 desk top engraver ?

Category: Show Your Stuff

just a quick test. things look a lot more consistent. i just wanted something that would cut the same under different conditions. the cutting was 1/4 deep with a .020 step over at 50 IPM with the final pass @ 40 IPM the starting stock was 1 inch x 1 inch x 1/2 the hex is ,924 and took about a minute flat to cut. I'm' sure I can rough a little bit more aggressive and i light finish pass should help with a better finish. 

a step in the right direction for sure, i would think a belt drive machine is going to hit the wall at some point on surface finish.

 
  • tommylight
  • tommylight's Avatar
14 Sep 2024 21:54
Replied by tommylight on topic PWM/frequency signal as input to Mesa card

PWM/frequency signal as input to Mesa card

Category: Driver Boards

Funny aside: We had to change the name of the THCAD on a invoice for a
shipment to Brazil as anything with the letters THC gets held up in customs...

I wonder why, they should check for stuff containing THC LEAVING the country! :)
  • tommylight
  • tommylight's Avatar
14 Sep 2024 21:50
Replied by tommylight on topic 7i96s Extra I/O Daughter Board Selection

7i96s Extra I/O Daughter Board Selection

Category: Driver Boards

FYI, i have used a Mesa 7i84 for the control panel on my Mazak, although i have a Mesa 7i73, would have needed a lot of level changes, especially since it uses an old +-12V MPG encoder.
Versatility is a very strong feature of Mesa cards, and i like that, a lot! :)
  • rodw
  • rodw's Avatar
14 Sep 2024 21:50
Replied by rodw on topic Ethercath 1.6 workable or not?

Ethercath 1.6 workable or not?

Category: EtherCAT

the reinstall might overwrite your ethercat conf file.
I don't think the linuxcnc hal driver will be affected.
  • rodw
  • rodw's Avatar
14 Sep 2024 21:36
Replied by rodw on topic Linux beginner RPI 5, GPIO + ethercat 4 axis adventure

Linux beginner RPI 5, GPIO + ethercat 4 axis adventure

Category: Basic Configuration

Unfortunately the ethercat code has nothing to do with linuxcnc so we have no control over the features it offers.
(Other than to wite instructions which you ignore at your own peril ) 
File Attachment:
  • rodw
  • rodw's Avatar
14 Sep 2024 21:27
Replied by rodw on topic EtherCAT Communication Issues, Lost Frames, Interruptions in Program Execution

EtherCAT Communication Issues, Lost Frames, Interruptions in Program Execution

Category: EtherCAT

I am pretty sure that RTAI is not supported  by ethercat debs. For starters, the debs use DKMS  so the kernel modules are compiled on yur computer so I suspect that requires a mainstream kernel to fetch the linux-headers source code.
  • rodw
  • rodw's Avatar
14 Sep 2024 21:11
Replied by rodw on topic Ethercat build from source - full instructions

Ethercat build from source - full instructions

Category: EtherCAT

Rod, I was proud of that sticky... but you were the one that got it up there to start with.

Sorry, I noticed several people were trying to mix this and the repositories together and needlessly getting into trouble because of that.
Plus the ethercat driver source should be coming from this repository because its maintainrd and has had a lot of changes
github.com/linuxcnc-ethercat
It has a buildbot that publishes itself on the ethercat repos.
  • JackRay
  • JackRay
14 Sep 2024 20:20
Replied by JackRay on topic Comparison between Raspian 12 Bookworm on Raspberry Pi 4 and Raspberry Pi 5

Comparison between Raspian 12 Bookworm on Raspberry Pi 4 and Raspberry Pi 5

Category: Installing LinuxCNC

Thank you very much for this work. I have tried X times to compile kernels without ever succeeding.

thanks again for your work
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