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  • Hawk83
  • Hawk83
24 Jul 2024 21:48
Replied by Hawk83 on topic Carousel Toolchanger

Carousel Toolchanger

Category: Advanced Configuration

Update…

I have been thinking and reading some more and I think that if I can find a way to access the system variables #<_current_tool> and #<_selected_tool> from within a G/O-Code subroutine, I think I can find a way to do this.

If I haven’t overlooked something important, a subroutine to return the current tool from the spindle to its pocket and retrieving the requested tool from its pocket and inserting it into the spindle shouldn’t be too diffucult, since all the tool-carousel moves, except the carousel rotation, are controlled by pneumatic cylinders. All the tools in the carousel have fixed pockets, so it is relatively easy to keep track of their positions.

I might be totally wrong here, but I will give it a go and see if I can make it work.

I will keep you posted.

And if you have any hints, tips, tricks or suggestions regarding this, please let me know. :)

Have a nice day folks. :)
  • tommylight
  • tommylight's Avatar
24 Jul 2024 20:52
Replied by tommylight on topic Mostly 3D Printed CNC Foam cutter

Mostly 3D Printed CNC Foam cutter

Category: CNC Machines

www.amazon.com/HiLetgo-BTS7960-Driver-Ar...urrent/dp/B00WSN98DC
Damn, it got to 10$ in price! I got mine for 5$ each right before the pandemic started.
  • my1987toyota
  • my1987toyota's Avatar
24 Jul 2024 20:40 - 24 Jul 2024 20:40
Replied by my1987toyota on topic Mostly 3D Printed CNC Foam cutter

Mostly 3D Printed CNC Foam cutter

Category: CNC Machines

no need to apologize tommylight. I tried finding that exact board and for some reason I can't find it here in 
the states, instead I got what was pictured earlier. Hopefully it works out. I will be testing the other SSR still to
see if it can be PWM'd to any usable effect or if it is completely unusable for anything other then a switch.
  • shasse
  • shasse
24 Jul 2024 20:36
Replied by shasse on topic Integrating a BCL-AMP capacitive sensor to LinuxCNC

Integrating a BCL-AMP capacitive sensor to LinuxCNC

Category: Plasma & Laser

This is what I am doing (reading the frequency directly) and it works very well.
  • my1987toyota
  • my1987toyota's Avatar
24 Jul 2024 20:24 - 24 Jul 2024 20:27
Replied by my1987toyota on topic Hot wire foam cutter - mapping Z and A axes to U and V

Hot wire foam cutter - mapping Z and A axes to U and V

Category: Basic Configuration

Looks like it could handle full 4' x 8' sheets of foam . Cool. Does your DevFoam program also make code for a 5th axis?
  • Lpkkk
  • Lpkkk
24 Jul 2024 19:47 - 24 Jul 2024 19:48
Replied by Lpkkk on topic Remora - ethernet NVEM / EC300 / EC500 cnc board

Remora - ethernet NVEM / EC300 / EC500 cnc board

Category: Computers and Hardware

Hi all, today I've tried to flash my nvem (v6), unfortunately without luck. I've got timeout error.
I've used this daplink device :
github.com/wuxx/nanoDAP/blob/master/user_manual_en.md

I've connected nvem to my daplink like that(looking at the nvem from the bottom, so my daplink connectors are on bottom-right) :
1-not connected 
2-tms/io
3-tck/ck
4-gnd 


I've connected external 24v to nvem board. 
I'm not sure what I've done wrong. Can someone please help? 

 
  • kmeld
  • kmeld
24 Jul 2024 19:28
Subrouting Path - no effect was created by kmeld

Subrouting Path - no effect

Category: AXIS

Hi,
I have added
SUBROUTINE_PATH  = /home/km/G_Code/SUB/

in to DISPLAY sectoion of INI file, but this has no effect.
I can only call subroutines if their files are in PROGRAM_PREFIX directory.

How to correctly specify subroutine patch for AXIS?

Cris.
  • tommylight
  • tommylight's Avatar
24 Jul 2024 19:04 - 24 Jul 2024 19:05
Replied by tommylight on topic Mostly 3D Printed CNC Foam cutter

Mostly 3D Printed CNC Foam cutter

Category: CNC Machines

Use a BTS7690 or whatever numbers, very cheap, has no slow optocouplers to mess the signal, as there is no need for isalation from the same power supply.
And each can controll 2 heaters independently (well it can do 4 but ... ), can handle over 30A i think on each IC.
Edit:
Oooops, i mentioned this before on this topic, sorry.
  • Hawk83
  • Hawk83
24 Jul 2024 18:44 - 24 Jul 2024 19:47
Replied by Hawk83 on topic Carousel Toolchanger

Carousel Toolchanger

Category: Advanced Configuration

Hi again.

I understand the general concept of motion controlled/interpolated axes and how they work. But I can’t clearly see how all the different components/functions/addons in LinuxCNC work together and share different kinds of parameters, variables, bits, etc.

As the machine is setup now, the tool carousel motor is configured as Joint 3/C-axis and can be commanded manually by jogging, by MDI-commands and also by a G-code program. In other words, a fully functioning axis that can be interpolated with the rest of the axes on the machine.

The servo-drive is controlled by a +/- 10V analog signal and is giving encoder feedback til LinuxCNC.

I have setup the encoder-scaling in the servo-drive so that the servo-drive sends 3600 encoder-pulses per revolution of the carousel back to LinuxCNC.

My tool-carousel can hold 8 tools, so the 3600 pulses per revolution is easily divided by 8 to get 450 pulses per tool-pocket advancement.

Now… I know this setup is completely overkill for driving a tool-carousel, both in terms of accuracy and motion controllability, but as this is how the machine is setup, I was hoping I could use the tool-carousel as is.

So to adjust my questions:

-Can the tool-carousel be controlled (relatively easily) from carousel.comp with this setup? i.e. with +/- 10V analog signal and encoder feedback?
-If not, what would be an easy way of rearranging the setup so that I can get this to work? Do I need to rewire and reconfigure the servo-drive so that I can move/jog it at a constant speed by HAL-pins?

Hope this clarified my project a bit. :)

Thanks for all the replies folks. I really appreciate it. :)
  • Ritterchen
  • Ritterchen
24 Jul 2024 17:46
Replied by Ritterchen on topic Duplicate settings in Pref File

Duplicate settings in Pref File

Category: Gmoccapy

I can confirm that these errors appear only after a toolchange has been done after LinuxCNC started.
  • garthnoakes
  • garthnoakes
24 Jul 2024 17:28
Replied by garthnoakes on topic Hot wire foam cutter - mapping Z and A axes to U and V

Hot wire foam cutter - mapping Z and A axes to U and V

Category: Basic Configuration

No bow - I built a machine that's about 9' total wire space, 4' wide and 4' high. I used a spring on one side and a tube filled with lead weights on the other side, The wire goes to that through a pulley, so I can cut tapers.

Its really a simple machine but I had lots of problems - parallel port issue, blown power supply etc. But now it is working pretty well
  • my1987toyota
  • my1987toyota's Avatar
24 Jul 2024 16:20
Replied by my1987toyota on topic Mostly 3D Printed CNC Foam cutter

Mostly 3D Printed CNC Foam cutter

Category: CNC Machines

The SSR I was using was a DC to DC solid state relay.And I agree the problem I had was probably due to the pwm switching frequency
being too high as it went from nothing to holy crap my wire is glowing with the control only commanding a change between
5 to 10 percent. On my stand alone Hot wire power supply which uses a PWM brushed motor controller and gives me plenty
of linearity. Both are using 24VDC power. The mosfet I ordered is set from the start to drive and control a heater. Bed, Hot
wire, doesn't matter. They're both resistance heaters. Right now the control on the foam cutter is using GRBL. I am still
struggling to get a working PWM signal coming out of my 7196 to drive a circuit to control the hot wire. And since I need
my foam cutter operational for a demonstration for some people I know at the flying club I needed something with a
high probability of success to work. For now the SSR isn't it. Fortunately I still have my stand alone power supply and 
if I must I will use that for the demonstration. I just don't have a whole lot of faith in the free standing mosfet on the RAMPS
1.4 board D8 position. I could be wrong , but having a mosfet burn up mid way through a demonstration don't look good.
LOL.
  • anli
  • anli's Avatar
24 Jul 2024 15:49 - 24 Jul 2024 15:51
Error in log was created by anli

Error in log

Category: Basic Configuration

Hello,
I get the following error in log:
Loading Real Time OS, RTAPI, and HAL_LIB modules
Starting LinuxCNC IO program: io
libnml/buffer/shmem.cc 320: Shared memory buffers toolCmd and toolCmd may conflict. (key=1004(0x3EC))
libnml/buffer/shmem.cc 320: Shared memory buffers toolSts and toolSts may conflict. (key=1005(0x3ED))
libnml/buffer/shmem.cc 320: Shared memory buffers emcError and emcError may conflict. (key=1003(0x3EB))
Starting HAL User Interface program: halui

The full log for reference is (I solved the error with io.hal but wonder about the above three lines):
Warning: Spoiler!


How can I solve this? I'm using LinuxCNC 2.9.3 from recommended installation with Debian 12 (as downloadable on download site).

Thanks a lot for your help!
Best, André
  • manfrel
  • manfrel
24 Jul 2024 15:46
Replied by manfrel on topic Mesa 7i96s + DM556T -> Motors not moving

Mesa 7i96s + DM556T -> Motors not moving

Category: Driver Boards

Where do I find this pin?
  • tommylight
  • tommylight's Avatar
24 Jul 2024 15:11
Replied by tommylight on topic Mostly 3D Printed CNC Foam cutter

Mostly 3D Printed CNC Foam cutter

Category: CNC Machines

Two types of SSR:
1. AC type, turns on normally, does not turn off at all UNTIL the outputs voltage drops to 0, can do PWM at very low rates, usually limited by the mains frequency, uses TRIAK's or THyristors
2. DC type, can be switched on and off normally, uses MOS-FET's, can do pretty high frequency PWM.
As for the linked SSR by Toyota, simple MOSFET's that may or may not have issues with proper gate driving, does not state what exact MOSFET they use (they call it tube) so no way of knowing if the used type is TTL level ones.
MOSFET - can be only on or off, except when actually required to heat like when used in DC load testers, TTL level ones require ~4V on the gate to open fully, all others ~15V, have capacitance on the gate so will not turn off without a resistor tied to gate and source pins, or other means of getting rid of the capacitance, best driven by push-pull drives, very low resistance when fully on
TRANSISTORS - can be controlled linearly (depends) and will proportionally allow current to flow between Emitter and Collector depending on the Base current/voltage, always heat at higher currents as they always have some drop in voltage.
Not easy to shrink all the info, sorry.
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