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Thanks for sharing!

Maybe you could post your gcode so we have something to go on.

I currently am building out my machine and have somewhat of a stupid question that is racking my brain. I have a tiny homebuilt lathe that has XZC kinematics plus a stepgen servo spindle.

My plan is to add a dual motor Y axis (in my case it is a vertical axis) onto the lathe cross slide to give Y axis capabilities. Now my actual question is much more simple but I am struggling how to think it through and want to make sure I am capable of taking on this extra axis project.

Here is my issue:

In my case, i will have a rigid steel coupler between both sides of the Y axis to attach a spindle and gang tooling / etc. How can I ensure that the position of the coupler on each side ALWAYS stays at the exact same height, as there is no room for misalignment. My thoughts are:

1. Ensure the home switches are EXACTLY at the same height, but i cant imagine i could do it perfectly
2. Add some sort of adjustment mechanism to the coupler such as oversized bolt holes, allow it to home on both of the home switches, and then tap the coupler level and bolt it down which would account for any home switch misalignment
3. perhaps linuxcnc has some sort of axis offset you can add to account for something like home switch height difference? I.e you calculate the axis offset by jogging it until the coupler is perfectly parallel to the cross slide and then set a difference in height between the two axis?


Its clearly an easily solved issue given how common things like dual Y axis routers are - but I am a bit confused this and was hoping someone could chime in who has already done a dual motor axis?

I want to run my first drilling, countersinking, and threading program on my GSK 980 mdi milling machine. Upon starting it, tool 1 crashed 3 times.

The job I want to do is a steel bar measuring 1 inch wide (y-axis), 0.5 inches high (z-axis), and 90 cm long (x-axis). It has drilled holes, followed by countersinking, and ends with a thread for an M10 x 1.5 screw.

If anyone has an example that could help me correct what I've done, that would be a great help.

Another optimization is to pin the Ethernet IRQ to the last processor
(the one LinuxCNC uses for real time)

Here is a test script to run to temporarily set this:

 

Download the script

chmod +x pinirq.txt

then

sudo ./pinirq.txt  ethernet_device_name

where ethernet device name is something like eth0 or eno1
( ip a to find the device name )



 

You can use say 7i96s_5abobd.bin. 

This gives you 10 stepgens total and expects a common "Mach 5Axis BOB"
(shown below) parallel port breakout connected to P1.

You can run step drives directly from the P1 outputs (step drive STEP+,DIR+ to +5V
STEP-,DIR- to P1 outputs) BUT a wiring mistake will be costly...

loadrt carousel pockets=4 encoding=counts dir=1 num_sense=1

I know nothing about the carousel component but should that be dir=2 ?

unfortunately I don't have video outputs on the motherboard, I'm looking for a motherboard to be able to do this, are there any pcie video cards that don't create problems? No to video cards with additional power please!

small OT, I inserted these strings in hal and ini but I continue to have the same movements on the stepper, where should I ask for this problem?
remora-docs.readthedocs.io/en/latest/software/hal-examples.html

Thanks to everyone for the intervention in this post that helped me to improve the management of the IRQs in the system!
 

I am building out an XZC+Stepgen spindle lathe and want to add a dual motor Y axis to this lathe. Right now i am using 4 of the 5 stepgens for XZC+Spindle but i am hoping there is something easy I can do to add one more stepgen.


Is there a firmware that would unlock another stepgen for my 7i96s? Should I forgo that and look for an addon card? My goal is to mess with as little stuff as possible so as to not break what is already working.

I heard there might be a firmware that would allow this without a daughter card but I am looking through the support software and it seems there isnt a currently built one?

Any ideas?

OK, so no one actually knows exactly how to make this work for the current state of the software, or if they do, it must be way to difficult to explain the current process in a single post. Tragic, but I will have to accept it. I think I will cut my losses at this point and purchase a MESA 7I96 or some such. They seem to be only a few $$ these days anyway and they are in country, (less expensive than some of those DAP units on Amazon).

Thank you for your attempt to help, it has been appreciated. It all looked to be so straight forward at first glance and it probably was at one point.

It just seems hard to comprehend how the current process of converting an ST-link to a DAP-link has become so complex that it can not be explained in a single post, but here we are.

OK, i forgot what this was about, so yes, do continue testing and poking around.
Youtube will use graphic subsystem and that must use interrupts and other resources, causing spikes. Use integrated graphic, usually that works OK.

I wanted to see the stepper turn correctly, also to understand how ini and hal work if they are connected to each other. Honestly I would have liked to see the system turn with youtube active without errors.

I have a few observations:

no pulses are generated for reverse movement when the magazine turns in one direction the stepgen.2.position-cmd value changes by 400 then stepgen.2.position-fb and carousel.0.counts tend to this value. when the moment comes for reverse movement nothing changes in the three above parameters. despite the fact that the Dir pin changes there are no pulses - so for some reason the carousel component does not add pulses resulting from the set carousel reversing time. N .rev-pulse .
I do not know how the mechanism should work the instruction says carousel.N.rev-pulse float in
The duration in seconds for which a ratchet changer (Boxford, Emco) should pulse the reverse pin to lock the holder.
on logic so pulses in an indefinite number for a specified time possibly some mathematics could calculate that if someone wants the reversing to last 5 sec. and the pulse frequency is known, stepgen.2.position-cmd should be increased by the result of these calculations and the pulsation command should be issued.

sorry I was no clear What yo mention is the actual process What I stated is the future state if the process can be modified we trying to avoid using 2 materials or 2 gCode files or edit the Gcode file to change PD to 0

1. make piercing using another material config, for piercing only
2. ok
3. ok
4. start cutting with config for the material you are cutting.