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  • robh
  • robh
08 Mar 2025 20:48
Replied by robh on topic Joint Error After large rotary move

Joint Error After large rotary move

Category: General LinuxCNC Questions

running version 2.9.2

reason for a high count on C is because its tool path with just continues +C axis moves in it to form a swarf move in a hole,

in the ini for the c axis i have
MIN_LIMIT = -1e99
MAX_LIMIT = 1e99

ENCODER_SCALE = 65536
#1/5 first gear , 1/72 worm 2nd gear
#16384*4= 65536 pp/r
#gears 1/5+1/72=1/360
#65536*360/360=65536
  • jst
  • jst
08 Mar 2025 20:45
Replied by jst on topic Mitsubishi Meldas Control and Motors

Mitsubishi Meldas Control and Motors

Category: Milling Machines

One option would be a stmbl v5: github.com/freakontrol/stmbl
There is also a thread on the forum.
I have it running with smaller Mistubishi Motors, your encoders should be supported. The HA103 Motor is on the upper power limit, but it should be fine. It can run the 200V motors direct from mains voltage without a transformer.
  • meister
  • meister
08 Mar 2025 19:45
Replied by meister on topic How to Control a PWM Gripper

How to Control a PWM Gripper

Category: G&M Codes

i use M68 to control my rc-servo gripper's
so i can control it by gcode and for the gui i use mdi commands and a vcp gui with buttons to set some fixed positions

[HALUI]
MDI_COMMAND = M68 E0 Q-100
MDI_COMMAND = M68 E0 Q-75
MDI_COMMAND = M68 E0 Q0
MDI_COMMAND = M68 E0 Q75
MDI_COMMAND = M68 E0 Q100

www.youtube.com/shorts/Tp3savo-MGs
  • robocidalmaniac
  • robocidalmaniac's Avatar
08 Mar 2025 19:17
Replied by robocidalmaniac on topic How to Control a PWM Gripper

How to Control a PWM Gripper

Category: G&M Codes

Please a few questions.
I have a Scorbot-ER-3 (with original control box) working using LinuxCNC, But cannot activate the gripper using G-Code commands or the Logitech dual action F310 controller pendant. When Andy designed this for LinuxCNC in 2020 the only way to open or close the grippers is through a GUI pop-up box and the mouse.
Thank you for your time.
  • jtrantow
  • jtrantow
08 Mar 2025 18:40 - 08 Mar 2025 18:47
Replied by jtrantow on topic Rigid Tapping - VFD and needed encoder ppm

Rigid Tapping - VFD and needed encoder ppm

Category: Milling Machines

You can make or purchase a quadrature encoder with index that uses three detectors. With quadrature encoding the counter increments each time either the A or B detector transitions so you get 4X the number of teeth or holes. You also get direction and diagnostics if the pulses transition incorrectly. The index signal Z is generated once per rev and can be implemented with a deeper tooth or another hole offset from your main pattern. There is no need for excessive resolution for threading. I have no problems with 65 teeth/260 pulses per rev on my lathe or rigid tapping  using a 100ppr encoder on my mill.

With 55 holes and two detectors (A and B ) you would get 220ppm. To achieve this you'd want to get approx 50% duty on/off from each detector (controlled by size of hole or teeth and how the detector aligns. You may want more or slighty larger holes to get approx 50% duty. You would want the A and B signals offset by approx 25%. You should use halscope to display the signals as you adjust the detectors. The index detector can be adjusted independently as it is normally aligned to a different radius. 

If you have enough holes/teeth (55 should be fine) you can also use "missing tooth" detection to index.

I have implemented and run a homebuilt quad encoder with index on my lathe for several years and through a couple upgrades. I also use an Omron optical encoder to rigid tap on my mill. I suggest paying $20 for an omron 1000ppr encoder and 3d printing GT2 timing pulleys. You can use a GT2 belt or just use a rubber band. 

If you really want to get crazy you can take a old printer apart. Most old printers use plastic optical wheels with an easily accessible encoders all over the place. The problem I ran into was cutting the wheel to fit around the shaft. These will have crazy resolution but the mesa encoder can probably handle that. (check ppr for the rpm you want vs maximum mesa encoder frequency)
  • PCW
  • PCW's Avatar
08 Mar 2025 17:52 - 08 Mar 2025 17:53

7i95t pin and firmware files with Stepgens and Inputs 5Axis BoB

Category: Driver Boards

It depends on how you created your hal initial file, as the signal names may be different,
so a suggestion may not work. Best to create the connection with the configuration program
or read through the hal file to see if there is already a signal used for the desired connection.

If I made a new signal (probe) it would be something like:

net probe motion.probe-input  <= hm2_7i95.0.gpio.054.in
  • cmorley
  • cmorley
08 Mar 2025 17:01
Replied by cmorley on topic Custom Panel

Custom Panel

Category: AXIS

Then start linuxcnc with your selected configuration.
It should see your modified .ui file and use it.

If it does not, change the INI to debug mode (DISPLAY = qtvcp -d qtaxis)
run linuxcnc in a terminal and post the output.
  • prokopcio
  • prokopcio's Avatar
08 Mar 2025 17:01
  • Nathan40
  • Nathan40
08 Mar 2025 16:32 - 08 Mar 2025 16:34

7i95t pin and firmware files with Stepgens and Inputs 5Axis BoB

Category: Driver Boards

Hi 

Thanks for your reply. However, please can you share the required line for inputs in the HAL file for connection eg probe.
  • andypugh
  • andypugh's Avatar
08 Mar 2025 15:36
Replied by andypugh on topic Cheap Amazon touchscreen monitor

Cheap Amazon touchscreen monitor

Category: Computers and Hardware

I tend to seek out Surface Acoustic Wave touch displays for CNC work. Those can't do multi-touch so the one you linked can't be SAW.
SAW offers gloved-finger operation, resistance to triggering by flying swarf, and a glass front surface for easy cleaning and scratch resistance.
  • esmurf
  • esmurf
08 Mar 2025 15:23
Replied by esmurf on topic ethercat driver crashes linux kernel

ethercat driver crashes linux kernel

Category: EtherCAT

Thanks.

With the daisy chain cabling i got it to work, to the point where i can spin the servos from within linuxcnc. (Now i need some more hardware before i can continue...)
  • Murphy
  • Murphy
08 Mar 2025 15:21 - 08 Mar 2025 15:23
Cheap Amazon touchscreen monitor was created by Murphy

Cheap Amazon touchscreen monitor

Category: Computers and Hardware

Anybody here use these cheap Amazon touchscreens ? They are usb input for the touch function.
Dragolftie Touchscreen Computer Monitor 21.5 Inch FHD 1920x1080P, Built-in Speakers, VESA Supports, 10-Points Touch Screen PC Display with Type-B HDMI VGA Port, 75Hz Desktop Touch Display, Black amzn.eu/d/fxjCQLI
 
  • PCW
  • PCW's Avatar
08 Mar 2025 15:19
Replied by PCW on topic 7i96s Watchdog Ethernet

7i96s Watchdog Ethernet

Category: Deutsch

I don't see anything obvious wrong (SSD/DISK errors can cause large latency spikes but I did not see any)

One thing is that you have lots of things in your kernel command line, on similar hardware (intel CPU and MAC) that's
working, I just have (other than the hard disk specific info):

ro quiet splash intel_idle.max_cstate=1 processor.max_cstate=1 idle=poll intel_idle.max_cstate=1 i915.enable_dc=0 isolcpus=3 i915.enable_rc6=0
  • jtrantow
  • jtrantow
08 Mar 2025 15:08
Replied by jtrantow on topic Lathe spindle index only?

Lathe spindle index only?

Category: Basic Configuration

I converted my lathe from parallel port to mesa when I added linear encoders. Prior to that, I had zero problems threading with the parallel port using this 65 tooth, 260 count disk using a quadrature software encoder on an ancient PC. I only used the spindle encoder for threading (<150RPM) so I'm not sure what the limit for this setup was. I still run 4 identical ancient PCs for my LCNC machines but they all have mesa cards now.

3d printed timing pulleys are a great low cost solution for the low load timing application.

The slotted disk (I used thin copper coated pc board I had laying around) is easy if you have a working CNC router or mill. The finicky part for me was aligning the sensors to the teeth. To get quadrature and index signals all three encoders need to be positioned just right.  

I mounted my ballscrew bearing block directly to the apron. (original mount was damaged) This gives me just enough room for a 12 or 13T timing pulley to pass under the X slide. I may have modified the bearing block for clearance. When you remove all the manual clutter, there is room to mount the x stepper directly underneath so you end up with a shortened x axis that doesn't get in your way.

I used a wireless MPG for a while but found the joypad was much better for jogging and feeding at a consistent rate and I use MDI when I need precise movements anyway. As a bonus, it's easy to cut a nice 45 degree chamfer using the analog stick! 
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