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the belts i am using don't have much backlash if any. Planetary gear boxes have some backlash to them and they require some space. i agree you can get some cheap gear boxes out of China even a small harmonic is not too bad in price but require the extra space. if you were needing loads of torque a harmonic drive would be the way to go but i noticed the life on the cheap ones is only 6000 or 7000 hours.

Belts are dirt cheap i would have to price around but you can even get pulley stock with the teeth cut if you don't want to get into doing that part and want to do some custom pulley ideas.

Let me go run auto-tune. And see if it changes much.

Yes, usually for lower voltage you need a more powerful driver.  But it should still work but you won't be able to use it at full power.  Did you follow these settings?

 

tommylight wrote:

rodw wrote:

@tommy (or another mod) could you sticky this thread please? It's a gold mine of info!
Done.

I am not sure this needs to be stickied anymore as ther has been so much work by Scott Laird on the ethercat hal driver which also includes a buildbot that pushes the deb file across to the etherlabmaster guys who have agreeed to host it for us.
Today, you just need to:
Then follow the sticky in this forum section
forum.linuxcnc.org/ethercat/45336-etherc...-how-to-step-by-step

Some people have got tangled up by following this method and then trying to install from repositories.

My feeling is it should be unstickied but what do others think?

Sometimes you need to install the ethercat repositories and don't have the linuxcnc  ISO handy or:
1. ethercat's security key has expired and needs updating
2. You are not running Debian Bookworm installed by  Linuxcnc's ISO on the downloads page.
3. You are running linuxcnc on  hardware that is not directly supported by our ISO

Please proceed as follows.
1.  download the attached script.
2. rename it to be ecat.sh (eg remove .txt)
3. Navigate to the download folder in a terminal console
4. type: sudo ./ecat.sh

Follow the steps outlined in this sticky
forum.linuxcnc.org/ethercat/45336-etherc...-how-to-step-by-step

The script will delete the ethercat apt sources file if it exists (and has the same name as used in our ISO.)
Mods might like to sticky this as some people have needed this recently (Due to point 1)
 

I'm kinda thinking this vfd is just too underrrated for this setup.
Considering the output voltage is max 200V and my vfd is limited to ~11A , it could handle the ~2.2kw max of the motor. but probably has too little juice for low rpm's.

As when it is trying to ramp up the current on the display is like 17.5A which my vfd can do in short burst but not long.

That would leave the following options:
- Fit it with a 7.5 -10kw vfd
- Re-fit the OEM 380 - 200V trafo and get a 3X230v ~4kw vfd
- Replace the motor with a china 380V equivalent

I'm thinking about the last option as that makes life easier. The cost of all of these options are pretty much the same.

machinedude wrote:

i have seen some rotation reductions with ring gears and arc tooth belts that looked interesting. i was looking at size requirements and it is pretty compact and low profile but it's only around a 6 to 1 reduction.

You could consider planetary gearboxes. These are not expensive out of China,
We wanted to use a 5:1 gearbox on a retrofit recently but we had to keep the original mounting geometry to a NEMA23 motor.
WUMA gears did a custom version with an 8mm dia shaft (usually 14mm) and a custoom shaft length. They charged an extra $10 for that but the total was still only USD $77 per gearbox. We bought 3,

i have seen some rotation reductions with ring gears and arc tooth belts that looked interesting. i was looking at size requirements and it is pretty compact and low profile but it's only around a 6 to 1 reduction. my thought would be plus 2 axis configurations or robotic arms having a use for something like this. The problem i see is on the programming side with CAM is the software being so expensive beyond the 3-axis hobby use Cam i use at home.

The commercial 5 axis CAM on average is probably somewhere in the ballpark of 10K per year which is out of reach for most on a hobby level.

Reset the vfd, did startup wizard, only changed these parameters (bold = default):
P00-10 control method velocity mode
P00-11 velocity mode vf open ctrl
P00-16 load select heavy duty
P00-17 carrier freq 4khz
P1-00 max out freq 250hz
P1-01 motor f base 50hz
P1-02 max out volt 1 200v
P1-10 mid out freq 1-1 3hz
P1-04 mid out volt 1-1 22v
p1-05 mid out freq 1-2 1.5hz
p1-06 mid out volt 1-2 10v
P1-07 mid-put- freq 1 1.5hz
​​​p1-08 min out-volt 1 32v
P1-10 upper bound freq 250hz
p1-12 1st accel time 10s

vid: youtube.com/shorts/VwO0N8tdShA?si=rAUIbYFLjQx5ai4V

The VFD is programmed to output 200V max. It is indeed a SIN-COS encoder and that works with the PG01-H encoder card that i use.
But when running in v/f mode this is not used anyway.

"The VFD 'wizard' should have an option to enter the basic nameplate data (FL amps, poles, ect.).  Try using that in V/F mode."
I did this, it just runs very rough, not how it used to run before at all.

My VFD can run all kind of setups including PM ones. One thing that makes me think it is PM after all is that the torque curve is basically max torque from 0rpm and goes down from there + It runs like shit in V/F mode as an induction motor.

I'm kinda tempted to just throw in in PM mode and see if it changes. Cause this does not seem to be it at all.

In a video on yt regarding a brother update they also set it to PM mode. The motor looks to be the same frame style as mine:

Sakhalin_Cat wrote:

I think it is necessary to correct this misunderstanding and change the source codes so that the files in both installation options are in the same location. It took me a lot of effort to understand that the system contains remnants from the previous installation. And judging by the questions, I am not the only one who has encountered such a problem.

I don't think that is possible and in any case we don't have control of the ethercat master. Building from source is well and truly obsolete now.

In that case use PncConf or MesaCT to create an XYZA config (IIRC that is the maximum number of axes supported in the configurator) and get that working in trivial kinematics (ie motors move correctly). Once that works copy/modify the A axis/joint entries in the hal and ini files to create the other axes you need and get them working as well.
Only move on to genserkins and switchable kinematics once everything works in trivial kinematics. The halfile and postgui_halfile in the sim config can help you with this step (ie connections to setup switchkins and genserkins DH parameters) but '_cmds.hal' is auto-generated for the simulation and will only cause you confusion.

I think it is necessary to correct this misunderstanding and change the source codes so that the files in both installation options are in the same location. It took me a lot of effort to understand that the system contains remnants from the previous installation. And judging by the questions, I am not the only one who has encountered such a problem.

Hello,

The only problem left with my retrofit is the lack of a second smart serial port on my 7i97t. I need one to connect a 7i84 that does al the I/O and the other one would be for a 7i73 in my control cabinet.
I tried getting the convertor board by talla83 to work and I'm done because it won't run. I`m now willing to buy my way out of the problem and just install a 7i85 to the expansion port. I have already flashed the bitfile for that as per your instructions . So I just need a 7i85 and a proper expansion cable.

Then I can connect the 7i73 with a butchered ethernet cable and also have connections for more encoders (spindle maybe and 4th axis) so I can justify saving my nerves by spending that extra money.

i would buy this combination:
eusurplus.com/index.php?route=product/pr...t_id=105&search=7i85
www.welectron.com/Mesa-Electronics-DB25M...O-Erweiterungskarten
 
Would that work with my 7i97t using my current bitfile 7i97t_7i85d.bin?
 

Thanks for the info.
I already have Inkscape on my computer..
Did not know it works for generating code for plasma.
I have tried it without success .
After some searches on the internet I found some tutorials to create Gcode for routers.

Where can I find some tutorial for generating Gcode for plasma?

So now I have another question.
I still have to make a water table.
The machines Frame is 1.8 x is 3.3 meters.

I am planning to put a rotational axle for round pipes. Max diameter for pipes about 250mm

Maximum sheet size I am planning is 1250 mm x 2450 mm.

How big would you make the water table.
Is there a benifit of making it larger than the Methal you cut? I am thinking about splashing etc.

What material thickness do you guys use for the water tray? What thickness for the slats?