Closing the loop with Linuxcnc, adding encoders to Mesa FPGA?

[Kitwn]

Still the Beta v2.8 for auto-squaring. They're still developing v2.7 as the main thread even though the beta version is actually quite stable, though fundamentally different under the bonnet. Might be worth checking out both versions for the features you want since v2.8 seems to have been all about making radical changes to the core software in order to do new things v2.7 simply isn't able to.
Just remember to CLONE YOUR HARD DRIVE before you make any changes.

[Desertboy]

Still the Beta v2.8 for auto-squaring. They're still developing v2.7 as the main thread even though the beta version is actually quite stable, though fundamentally different under the bonnet. Might be worth checking out both versions for the features you want since v2.8 seems to have been all about making radical changes to the core software in order to do new things v2.7 simply isn't able to.
Just remember to CLONE YOUR HARD DRIVE before you make any changes.

If I'm going to linuxcnc route with encoders I really want dual homing, it just "completes" the picture nicely.

I can cut at 10m/min with great success but for some reason my sizes are out, my 3d carvings are coming out good.

I did some simple tests moving X 10mm then back to 0 1000 times same with Y not seeing as lost steps.

It also cuts the same size at 1m/min and 10m/min.

I only cut wood it's my thing, I don't even touch ply just real wood.

If I can close the loop using my AM882's with a breakout board for the Mesa step generator card I own and changing some motors I'll do it just for piece of mind.

[Clive S]

If I'm going to linuxcnc route with encoders I really want dual homing, it just "completes" the picture nicely.
I can cut at 10m/min with great success but for some reason my sizes are out, my 3d carvings are coming out good.
I did some simple tests moving X 10mm then back to 0 1000 times same with Y not seeing as lost steps.
It also cuts the same size at 1m/min and 10m/min.
I only cut wood it's my thing, I don't even touch ply just real wood.
If I can close the loop using my AM882's with a breakout board for the Mesa step generator card I own and changing some motors I'll do it just for piece of mind.

I know you have said all this before but before you go down this route the machine should be made to cut accurately.

You are say it is out by about 1mm at 1M/min or 10M/min. That sounds like backlash or acceleration to high. I don't think changing the motors will help.

I would not attempt to close the loop until you get the gantry squaring sorted. Also closing the loop for a wood router in my opinion is a waste of time and money.

If you want to go with Linuxcnc I have a test ini file I could post that I know that works on a PP with V2.8 or 2.9 just for the that gantry squaring.

I have built a test rig for this from an old A frame type Prusa 3D printer with a motor on each side on Z running off a PP

[Desertboy]

I know you have said all this before but before you go down this route the machine should be made to cut accurately.

You are say it is out by about 1mm at 1M/min or 10M/min. That sounds like backlash or acceleration to high. I don't think changing the motors will help.

I would not attempt to close the loop until you get the gantry squaring sorted. Also closing the loop for a wood router in my opinion is a waste of time and money.

If you want to go with Linuxcnc I have a test ini file I could post that I know that works on a PP with V2.8 or 2.9 just for the that gantry squaring.

I have built a test rig for this from an old A frame type Prusa 3D printer with a motor on each side on Z running off a PP

It's a weird one Clive S, I cut a square indent it's 1mm undersized no matter what size the indent is but I move the machine 1000mm and it's spot on. I direct drive with couplings and everything is tight it's not slipping, I replaced all my couplings trying to solve this. My PSU is a Tolordial build, ~70v 1kva and 4 AM882's I'd be surprised if they're the issue here.

I've had the machine working for 2 hours doing a 30cm*40cm 3d carving with a R1 ball nose mill with 4% stepover this was spot on but the size was off.

When I cut 10 indents with a gap between them the indents were 1mm too small and the gap 1mm too large, tried with multiple tools of different sizes to be sure. I'm sure it has to be tool related but I had people check my gcode and it's good and I've had someone cut code I generated and there sizes were spot on.

I've also tried generating my code in Vcarve and Fusion to see if there was a difference, it's off, but it's repeatably off.

I definitely want the config file ;)

Not hooked it up to Linuxcnc yet, it's raining hard here today and I have the machine in a van so I need the weather to calm down a bit first.

[Clive S]

Still the Beta v2.8 for auto-squaring. They're still developing v2.7 as the main thread even though the beta version is actually quite stable, though fundamentally different under the bonnet. Might be worth checking out both versions for the features you want since v2.8 seems to have been all about making radical changes to the core software in order to do new things v2.7 simply isn't able to.
Just remember to CLONE YOUR HARD DRIVE before you make any changes.

2.8 IS stable 2.7 is no longer updated also it will not do auto squaring.

[Kitwn]

2.8 IS stable 2.7 is no longer updated also it will not do auto squaring.

True that it will never do auto-squaring but it's still where you have to start in order to then upgrade to 2.8. My recommendation is to do a clean install of LinuxCNC and use the configuration wizards to get the machine largely set up. That will populate most of the configuration files you need. Then upgrade to 2.8. Unfortunately the wizards have not been updated to fully incorporate all the new features so this is where you need to manually make changes to the config files as described in the thread referenced earlier. It's very important that from then on you NEVER use the wizards to change anything.

I'd also suggest a separate hard drive for this process, leaving the existing one completely unmolested and the machine able to revert to it's current state at the swop of a plug.

[Clive S]

Or you could go down this route https://forum.linuxcnc.org/9-install...start=0#164287
.
There are now quite a few iso's floating around with Linux mint that some members have made with 2.8 and 2.9 that work straight out of the box

[Desertboy]

Or you could go down this route https://forum.linuxcnc.org/9-install...start=0#164287
.
There are now quite a few iso's floating around with Linux mint that some members have made with 2.8 and 2.9 that work straight out of the box

2.8 has dual homing right? And I think a config for the Mesa card.

[Clive S]

2.8 has dual homing right? And I think a config for the Mesa card.

Yes 2.8 and 2.9 has it. It is a bit different than 2.7 But that now is a dead duck