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Hi everyone. I know this topic has been covered before, but I would like a bit of advice specific to my machine as I'm not that well versed in LinuxCNC.

I've built a 5 axis rotating nutating (head-head) type CNC and it's been running well for the past 1.5-2 years. However, I'm getting quite slow feedrates on certain multi axis operations and it's becoming increasingly frustrating.

As an example, this image shows a test file where the X and Y axes barely move, the Z and A axes don't move, and it basically just rotates the C axis. At a specified feedrate of 4000mm/min, it's only cutting at about 600mm/min. My max velocity for linear axes is 25,000mm/min, and angular is 4500deg/min. Acceleration is relatively high, and 4000mm/min should be achievable.

 

I'm using Fusion for the CAM, and the above test file is using swarf machining. This can only be output as a bunch of small lines, so I've gone as coarse as possible with the tolerance and that's set at 0.1mm, and I'm using P0.1 Q0.1 for smoothing. And I'm using TCP.

Correct me if I'm wrong, but is the slowdown in the feedrate due to the 1 line lookahead in multi axis?

I have a separate LinuxCNC config setup to run my machine as a simulation, and it uses a different ini file to my machines so I can test files prior to running them. With this ini file I've bumped up the max velocity a bit, and really bumped up the acceleration, and I've been able to get the required 4000mm/min. However, these velocity and acceleration speeds are very unrealistic for my physical machine.

So my question is, is this just how LinuxCNC is? Or am I doing something wrong? Or is there a workaround for this issue? I've also tried using inverse time, but it gives me the same outcome as programmed feedrate. Let me know if there are any files I should post (ini, etc). Thanks.

Here's a couple of photos of my machine.

 

 

HP Z600 WorkStation
forum.linuxcnc.org/18-computer/57073-hp-...or-use-with-linuxcnc

OK more tests done, and frankly way to much for a day and a half, but sparing you of the long whinny road so here is a lowdown in no particular order:
-uses about 80W of power at idle with Linux Mint 22.1 running the 6.13 RT kernel, should use less with the normal kernel
-uses 350W of power while running FurMark and Blender Benchmark at the same time with GTX1060/6GB graphic card, so fully loaded
-plays 4K@60FPS youtube videos at 1.5X speed without dropping frames, BUT, hardware acceleration must be turned OFF in FireFox. This is also something i do on every new install as FireFox has dropped the ball badly there.
-6.13 RT kernel works with the included Nvidia cards with NO proprietary drivers installed, fails with black screen when drivers installed.
-6.13 RT kernel will not work (well it will, once, then black screen) with AMD RX580/8GB graphic card, normal kernel works perfectly. Not tested with proprietary ADM drivers, just the included Mesa drivers (not our Mesa/PCW )
-6.13 RT kernel works nicely with PCI to parallel port adapter, LinuxCNC finds the port and works perfectly, 50000 base period might cause latency warnings, did not test tuning of any kind.
-PC has only USB2.0, so an addon USB3.0 card should be the first thing to get
-PC has 2 of full X16 PCI-E slots, so perfect for "Home Lab" cramming in two graphic cards for media server, or NAS with a fast SAS controller although not much space for 3.5" HDD drives it might be possible to cram 16 of 2.5" SSD just in the DVD-ROM space
-has enough power supply to run all of the above at the same time
-does about 54 points in Blender Benchmark (pitiful as my R7 7700 does 322 points with temperature limited to 75 degrees C in BIOS !!!)
-Replacing CPU's might just be a good idea as they should be pretty cheap, like 10-20$ probably even less on aliexpress, have not checked, Xeon 5570 are 3.3GHz parts while the included Xeon 5530 are 2.4GHz parts, that is nearly 8 GHZ of difference in total, worth the money if i could find them here for one or two of them, so 2 or 4 CPU's ...
- ... i am out, it is 2:53AM here, need sleep...

Why are there 2 topics for the same machine by two different users located in the same country?
Are you two competing who fixes the machine first?

Why are there 2 topics for the same machine by two different users located in the same country?
Are you two competing who fixes the machine first?

So sorry to be a pain, but I got everything downloaded and got the sim to run, but for the life of me I can't get it to come out of estop. I did have to change the permissions on the python files to mark them as executable to get it to run, so maybe there's something I did there. Is there any change in the estop behavior of the master version compared to 2.9.4?

EDIT:  Disregard this.  I gave up and just updated my install to the master and except for a couple errors for missing iocontrol.lube stuff it started right up. 

melfa like

www.youtube.com/shorts/UV3KBl6E2hw

www.youtube.com/shorts/YMXGiFoIyRk

The IP address for the WIFI should be assigned automatically via DHCP
not something you normally need to change.

Do make sure that you are not using wicd for network setup
it broken and does not allow a DHCP WIFI connection to coexist
with a static Ethernet connection.
 

trying to do this, I realize the computer I use seems to have some broader networking issue, I usually use it offline, I connected it to wifi but I have no acces to the internet, any leads to where this might come from? wrong ip adress setup on my pc?

It's funny my Lenovo ThinkCentre is a better performing than the ThinkStation from the same era.
Looking to get a quad core i7 for the T530 and see how that goes

But good find old mate

My RPi5 is working great on the mill, no performance issues, but not the best bang for buck performance wise

Strange issue...

You might try updating mesaflash to the current version:

github.com/LinuxCNC/mesaflash

(scroll down to bottom for build instructions)

Yes, I've been using the machine since 2022 with no issue using the stock firmware, i'm only trying to use mesaflash now to use a fifth stepgen. is there something with my linux install that could have gone wrong?

Imaginative idea.

See the config
sim/axis/vismach/puma
for an example config including a graphical representation of the simulated robot.

Note that getting the Denavit-Hartenberg parameters exactly right is not a trivial task if they are not provided. (and there are two different conventions for them)

There are a few examples out there. Look on YouTube.
For example: