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  • smc.collins
  • smc.collins
27 Jun 2024 20:32
Replied by smc.collins on topic when an inch isn't

when an inch isn't

Category: Installing LinuxCNC

I only measure in bannanas
  • Cant do this anymore bye all
  • Cant do this anymore bye all's Avatar
27 Jun 2024 20:23
Replied by Cant do this anymore bye all on topic when an inch isn't

when an inch isn't

Category: Installing LinuxCNC

The trouble comes when one assumes km instead of miles or the other way round, ask NASA about that one.
From what I’ve heard congress in the US actually officially adopted the metric system in the mid 70’s, could of been ‘76 which would make sense as to why it was ignored.
To me consistent units of tens makes more sense than 12 inches to a foot, 3 feet to a yard, 22 yards to a chain, this where my knowledge of it stops apart from 1.6km to a mile.
At least a smidge, just a bit and poofteenth (this maybe just a term to my local), “about that much” & “you can drive a truck through it” are easily understood no matter your base unit. There’s a few others but not entirely in line with “the code of conduct” ;)
  • jimwhiting
  • jimwhiting
27 Jun 2024 20:17
Replied by jimwhiting on topic Mitsub_vfd - back to back speed commands causes error

Mitsub_vfd - back to back speed commands causes error

Category: Advanced Configuration

Hi,
I've managed to get it to work on my machine now.

It appears there is a race condition in the run/fwd signal handling. My machine shows run == false, and fwd == true at the top of the code below, but run == true, fwd == true at the end where the transfer to last_fwd and last_run takes place. Moving the assignment to just after the comparison solves the issue.

I've included the butchered code to show what I mean. I'll revert and just test my single change next.
                # SET RUN AND DIRECTION
                # address FA sets the start and direction
                # it expects a 2 character hex representing a 8 bit (b0 - b7) binary number
                # bit 1 sets forward, 4 sets reverse, 0 stop
                # depending on the inverter and options other bits are possible,
                # but these three are consistent
                if not self['last_run%d'%index] == self.h[index]['run'] or not self['last_fwd%d'%index] == self.h[index]['fwd']:
                    print('MITSUB_VFD: Run: ', self.h[index]['run'], ' FWD: ', self.h[index]['fwd'])
                    print('MITSUB_VFD: LastRun: ', self['last_run%d'%index], ' LastFWD: ', self['last_fwd%d'%index])
                    self['last_run%d'%index] = self.h[index]['run']
                    self['last_fwd%d'%index] = self.h[index]['fwd']
                    if self.h[index]['run']:
                        if self.h[index]['fwd']:
                            cmd = "FA";data ="02"
                        else:
                            cmd = "FA";data ="04"
                    else:
                        cmd = "FA";data ="00"
                    word = self.prepare_data(cmd,data)
                    self.ser.write(word)
                    time.sleep(.05)
#                    self['last_run%d'%index] = self.h[index]['run']
#                    self['last_fwd%d'%index] = self.h[index]['fwd']
#                    if self.h[index]['debug']:
                    string,chr_list,chr_hex = self.poll_output()
#                        print('DEBUG: ',chr_list,chr_hex)
 
  • Cant do this anymore bye all
  • Cant do this anymore bye all's Avatar
27 Jun 2024 20:06
Replied by Cant do this anymore bye all on topic LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

Category: Computers and Hardware

Tho I haven’t had a chance to play with one, the 7i90 looks like it would make a great general purpose FPGA learning board. 72 bi directional pins that are 5v tolerant due to the bus switches used, tho buffers would be needed to drive LEDs.
Plus the pins used by the EPP interface and 3.3 only pins on the SPI connector.
Electrically the smart serial interface is RS-422, nothing non standard there.
Actually I wasn’t actually suggesting doing it, was more academic than anything else. Just the rantings of a mad Aussie.
  • rodw
  • rodw's Avatar
27 Jun 2024 19:53
Replied by rodw on topic Linuxcnc 2.8.4 does not show tandem items.

Linuxcnc 2.8.4 does not show tandem items.

Category: General LinuxCNC Questions

looks like it will home Z, then, Y, then X
  • blazini36
  • blazini36
27 Jun 2024 19:34
Replied by blazini36 on topic Universal Control panel build

Universal Control panel build

Category: Show Your Stuff

Did you decide to build a few for sale? If so, have you settled on a price? and if not, would you be willing to sell me a copy of your CAD? This looks great, and I have a machine to finish off.
 

I did not build extras yet but I have material cut for 4 or 5 more that I wanted to make the enclosures for and get them all powdercoated at once. Hold up has just been the fact that I was not satisfied with the software implementation of Arduino-Connector as I had issues with lag on the inputs that's really not acceptable. So I got sidetracked until I get this sorted.

I went back to the drawing board and made an EtherCAT controller for the IO which I prototyped months ago. Hold up on that is I have someone writing the firmaware for it and it's taking longer than I hoped/expected, hopefully it will be done soon.

It could of course just use something like a Mesa 7i90HD like any other control panel somebody might build.
  • COFHAL
  • COFHAL
27 Jun 2024 19:32
Replied by COFHAL on topic G54 ON START UP

G54 ON START UP

Category: AXIS

I already found the problem after two days, it was in the .HAL file in the various signal section, they had included the instruction halui.abort, but the truth is I don't know why this instruction changes from G54 to G53.
  • salvagedcircuitry
  • salvagedcircuitry's Avatar
27 Jun 2024 19:27
Replied by salvagedcircuitry on topic 1990s Millport CNC Vertical Mill Revival

1990s Millport CNC Vertical Mill Revival

Category: Show Your Stuff

Thanks for the kind words! Some thorough troubleshooting and a bit of luck truly paid dividends here. I'm still amazed that a 1MB ISA flash card, DOS and a floppy is all you need to parse some G-code and make some servos move. Nuts!
  • greg23_78
  • greg23_78
27 Jun 2024 19:09
Replied by greg23_78 on topic lube.py "No such file or directory"

lube.py "No such file or directory"

Category: HAL

 

 

 

 

 
  • cncbeagle
  • cncbeagle
27 Jun 2024 18:51
Replied by cncbeagle on topic Resume not working after M0

Resume not working after M0

Category: General LinuxCNC Questions

Just tried your suggestion of removing S20000 from the preamble. It appears to have worked. The reason I say "appears" is because it was not a straight forward test as I had already probed the board with the VFD off. Then I needed to warm up the VFD/spindle after which I ran the file from beginning to end. The probe section worked as expected as did the actual milling.

Thanks again for the suggestions.

I have been using Linuxcnc for a few years and I have learned enough to understand how little I really know about its inner workings. I started with a parallel port eventually moving to a mesa 7i76E. The machine started with 3/8-16 screws and skate bearings and now has ballscrews and linear rails. I enjoy modifying the machine as much as using it.
  • PCW
  • PCW's Avatar
27 Jun 2024 18:24
Replied by PCW on topic 7i96S - NPN-NC Proximity Sensors and NPN-NO 3D Probe

7i96S - NPN-NC Proximity Sensors and NPN-NO 3D Probe

Category: Driver Boards

The main NO/NC difference is just that you typically need to invert
the inputs of NC sensors in the setup, so no additional hardware is
needed.

You may be thinking of NPN vs PNP.

The 7I96S only has one input common terminal so cannot
accommodate a mix of NPN and PNP sensors without adding
external resistors.
 
  • aparecido
  • aparecido
27 Jun 2024 18:12
Replied by aparecido on topic Linuxcnc 2.8.4 does not show tandem items.

Linuxcnc 2.8.4 does not show tandem items.

Category: General LinuxCNC Questions

Have a look at the homing veocities
linuxcnc.org/docs/stable/html/config/ini...tml#_home_search_vel
As the docs say there is trade off between homing speed and overrun.
From memory I use search_vel 12 m/min and placed the home switch far enough away from the limit switch so the axis could coast to a stop
Then a much slower latch velocity to find the home switch edge
Finally a home_offset (of about 40mm) to move close to the limit switch to maximize the machine envelope

Whilst you can use a shared home/limit switch, and this works fine where there is some weight being moved (eg milling machine table) so the axis stops quickly, a lightweight gantry might be better off with seperate switches so you can home at speed.
 

 Ah ok, I'll test it at other speeds to see how it behaves.
 One more question, when I give the home all command, does it homing to Y and homing to the Z axis and then to Y and finally to X1+X2?
 The initial sequence is configured like this:
Z axis = 0
Y axis = 1
X1 axis = -1
X2 axis = -1
  • Rexus
  • Rexus
27 Jun 2024 18:09
7i96S - NPN-NC Proximity Sensors and NPN-NO 3D Probe was created by Rexus

7i96S - NPN-NC Proximity Sensors and NPN-NO 3D Probe

Category: Driver Boards

Hey All,
I am in the midst of rewiring my PrintNC to use a Mesa 7i96S card to add some functionality that the BoB can't provide.

I have NPN-NC proximity sensors for homing and would like to integrate a NPN-NO 3d probe that I have lying around. I suspect this may be more trouble than purchasing a NC probe but thought I'd ask.

Is there any way to wire in the NO probe into the Mesa inputs? I've read about using a relay to convert the NO to NC but was wondering if I'm missing something easier. 

Would it be easier to run NPN-NO proximity sensors to match the probe? I'm open to making changes at this point and even have an extra set of NO sensors for homing but wanted to ask prior to making changes.

3d probe is here .
Proximity Sensors are here

Any help would be appreciated.
Thanks,
Rexus
  • greg23_78
  • greg23_78
27 Jun 2024 18:07
Replied by greg23_78 on topic lube.py "No such file or directory"

lube.py "No such file or directory"

Category: HAL

i have try in my config folder but still the same problem
  • greg23_78
  • greg23_78
27 Jun 2024 18:05 - 27 Jun 2024 18:05
Replied by greg23_78 on topic lube.py "No such file or directory"

lube.py "No such file or directory"

Category: HAL

yes, i have my lube.py in /bin folder and is set in executable
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