Advanced Search

Well, that never took off. Purchased a used PC with a parallel port breakout board and set everything up with what looked correct. Used a buck converter to power the board and noticed it wouldn’t change the voltage. Powercycled the steppers and breakout board and PC immediately turned off. Left the PC unplugged and the buck converter came to life at 26 volts, immediately blowing the caps in dramatic fashion. Well now with a fried PC and breakout board, I’d like just a ready made solution to power my lathe. I was going for Linuxcnc as I wanted spindle sync and backlash compensation, so if there are any great budget options that are just a ready made solution so I can stop worrying about wiring and flashing boards, that would be fantastic.

made it,
i bricked the board

because the linux version on it was too old i wanted to update, but that went wrong somehow, now i'm trying to compile a new one and get it running again somehow.

it's no fun and very time consuming

unknown wrote:

BSD isn't forgotten, I've run it for years on a router/firewall.

+1
And used it's desktop versions for over 2 years, probably 20 years back.

BSD isn't forgotten, I've run it for years on a router/firewall.

Probably need the drive manual for that...

If it's like a classic motor drive, there will be three nested PID loops:

1. Torque (current) command/feedback --> torque (current) out
2. Velocity command/feedback --> torque out  
3. Position command/feedback --> velocity out

Is there any tuning program available for the drive?





 

And you can build a Linux system entirely from source, if you are into that kind of shenanigans.
Boot from a tftp server and run the OS entirely from ram. Or boot from a tftp server and mount the rootfs from a third machine.
A lot of home routers/access points/modems run Linux.

Running a Linux desktop is quite boring and mundane when one realises what Linux is capable of, and what a user can do with it once they read & experiment.

That's correct. I'm going to try to adjust the gain settings and see if I can get this tighter. Any suggestions what settings to look for? Many thanks

As had been suggested before, it looks like the drives themselves need tuning.

Not a firmware issue.

I would not expect motion until you enable the drives.

If there is an analog output issue, it typically shows up as a non-zero
output voltage when the 7I77 is powered.
 

Hi tommy, 

The voltage was the same at both drivers. I have dug a bit deeper and used Halscope and probed 

Joint.0.motor-pos-cmd against hm2_7i95.0.encoder.01.position

For both X and Y, I cut a few circles using arcs, and this is my result. Looks like the motor isn't keeping up with the encoder?

I wasnt sure what /k to use, so I have attached two screenshots, one all even /k and some scaled to fita better curve. This is all new to me so apologies in advance. 

I'm using Step/Dir Servos, I have just temporarily fed the endcoder back to LinuxCNC for testing. 
Im using 1kw ac servos by Litchaun 4NM the machine is a Haas mini mill. any thoughts?
   

  It works perfectly, will attach my hal for others to use

weedsmoker wrote:

that things sick, i wish i worked around something that epic and complicated,

And terrifying !!!
You see those big things on both ends of the machine with the rotating parts? Those move at 60m/m when at full tilt so the whole concrete floor shakes so much that the left servo drive errors out with over current!!! No errors when moving one or the other, just both. At 50m/m all is fine.
15cm of concrete is not enough rigid for all that monstrosity, but no one ever told them. I would venture a guess at least 30cm or 50cm just to be on the safe side, but i am no expert.

This is the third time i am reading this and still makes no sense.
If you browse a bit through this forum, you can see i have/use/built over 20 CNC plasma machines, so it is very hard to understand why would you change something that works perfectly for something else that will not work at all, or will work ONLY if you have a perfectly flat table and perfectly flat material.
Makes even less sense if using THC as that takes over control of Z axis, so does not matter what you put in the tool table.
Lack of replies should have alarmed you to something being off as there are plenty of Plasma machine users here willing to help anytime.
Material will warp during cutting, always, some more and some less, so using a plasma with no THC is possible but not enjoyable at all, and causes messed up nozzles and bad cuts.
I am pretty sure QtPlasmaC has a feature to skip probing for a given distance to reduce probing time, but i never use it.
I want to press "run" and go do something else while the machine does it's job.

Pictures of the machine?

Did anyone contact you about this?