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jimmyrig wrote:

Stepper online drivers have a 24v and a 5v logic switch at the top. It needs to be 5v for the mesa
 

It actually was this switch. Now everything works fine.
Thank you all very much for your help!

 

edit: just to share a bit of my progress: I found an old fusion support thread that suggested to use the doosan millturn fusion360 post processor and set "gotyaxis" to false everywhere. When I do that, and generate Gcode, it successfully does not include Y axis movements, however, I believe other changes are needed to align the gcode output to be compatible with linuxcnc and am struggling on where to start.I will attach this modified post processor, and attach a simple off center drilling gcode that I generated using it: 


 

 

Hello everyone, hoping someone in the community can help. I have a lathe that I modified to have the headstock be driven by a positional stepper motor, and have added a spindle on the cross slide WITHOUT a Y axis. Thus, I am looking for help getting a working processor that can generate gcode for 2d milling in this configuration, meaning I can do things like drill holes on the face of my stock off center. 

What is the best way to go about doing this? Has anyone already made or used a working post processor for this? An old thread in fusion360 support said to find a post processor for millturn and remove mention of the Y axis so it only generates gcode without it - is that the right way to go about it?


Lastly, can someone verify if my kinematics are organized correctly in fusion360? My rotational/positional axis is along the Z axis and holds the stock, my spindle is on the cross slide (X axis) and points along the Z axis (attached image)

 

Hi,

For coleair lines and curves with curvature=0 (clothoid, spline that is in fact a line), i fused them to one piece of type line.
This seems to work better.



 

@GeckoWorks & @PCW - Thanks for pointing out the 'alternative' MPG connection situation.  Overview post updated; if my edit is unclear, please suggest some wordsmithing.

Alright so it turns out I can use sinking outputs since all the outputs go to a relais board and I can just give the common on the coils +5V and then switch them by sinking. That means I can use the 7i97t as my "main card" with ethernet connection to the pc and the 7i84D for I/O. The 7i73 in the control cabinet could then be connected using the adaptor talla83 shows in the video, right?

I think with that I am all set.
7i97t: connection to PC, 3 analog axis outputs, encoder feedback with linear scales, spindle output, 3 handwheel mpg inputs(uses 6 inputs), 10 inputs, 6 outputs
7i84D: 32 inputs, 16 outputs

A whole 7i96 is a lot of card, for the potential expansion of a stepgen, maybe in the future. All those FPGA cards have a 25 pin expansion slot which we mostly dont use (P1 on the 7i97).
I am pretty sure you can add a stepgen onto a couple of those pins with a bit of playing around in the MesaFlash utility. It looks like you could also use that to hook in a second SS for the 7i73.

Peter (Talla83) has done some excellent videos on how to edit the bitfile for the mesa cards, such as this one (In german, but Youttube does good tranlations subtitles.


 

Hi,

I am now at the point that we have done :

- Calculate the velmax of each segment given the max curvature of that segment.
- Path Vel Optimizer: perform a forward scurve motion over the path, update vo's, ve's if valid.
- Path Vel Optimizer: perform a reverse scurve motion over the path, update vo's, ve's if valid.
- Plot 2d, 3d velocity profile.

2D velocity profile, the green verticals to z zero, indicates a segment transition.
You see i at the begin of the green curve, i added multiple colinear lines, to test the transition.
 

3D velocity profile,
 

My conclusion so far, if user gives no G64 P.. value. Then P=0. Then no fillet segments are created.
This must be avoided as fillets are ideal to get endvelocity's in line-line corners etc.
So solution is to set a very low P value if P=0 is given.
Then we set P=0.0001, this is valid and creates the fillets, and end velocity's without adding a bunch of extra sourve code.

Then i have seen when max_jerk is set at very low value, the scurve can't keep up and finishes with endvelocity > 0. This
is not ok. So when the Optimizer algo is performed, and the final velocity at the end of the path > 0, then
we must increase the jerk value until a valid output, wich is endvel=0. I have no other solution found for this so far.

I checked the motor cables for continuity with a multimeter, I didn't mix A and B.

tommylight wrote:

Stepper motor wiring is very strict, no mixing of coils, that is something most drives will not survive.
 

How will I know if a drive didn't survive? The green LED lights up continuously.

Update, my rs232 probe works now, it was just a wiring issue :
ibb.co/ZxrJnKZ

But transfer config still don't work, and probe doesn't show anything than on that image above.

Other screens :
ibb.co/jZMLThV
ibb.co/KV0D0tS

I've flashed remora-rt1052-nvem-0.2.1.bin, is that the right bin? 

I should have done the same on my last build.

Thanks ! I used the free program kicad. I have no experience with boards, but the important thing is that everything works

 

 

 

Also, for the outputs i really only need the analog signals for the drives and vfd and digital 5V outputs. Anything that is not 5V has its own little relay in the cabinet.

First of all thanks for the quick reply.

The setup with 7i97t with 7i84 would be ideal, however the 7i84 with sourcing outputs is currently out of stock everywhere I look. The spindle vfd takes a 0-10v signal and can therefore easily be controlled with one of the 6 axis outputs. I actually follow your Schaublin retrofit and that's where I got the idea for the 7i73 in my control cabinet. This can support physical keys in a matrix and also the encoders for Spindle/feed/jog so that's really good. I'm not satisfied with the cards in my electrical panel as well, but selecting from the available components this seems to work. Also, maybe in the future I'm gonna add a 4th axis to this machine and I'm not sure which type of motor I'm gonna use then, but having the 7i96 would leave the possibility of using a stepper or a servo for that.

Nice work. What did you use to design and layout the panel PCB?