MPCNC Plasma

This topic contains 22 replies, has 8 voices, and was last updated by  Damien 2 months ago.

Viewing 23 posts - 1 through 23 (of 23 total)
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    Posts
  • #69861

    Damien
    Participant

    I love this machine 🙂

    https://youtu.be/zxdziLFo3-w

    Just need to dial in settings now

    #69874

    Ryan
    Keymaster

    Oh man I need to get a plasma!

    #69886

    Damien
    Participant

    My brain is going wild with ideas of what to make now :).

    I’m totally new to plasma cutting, and would love if someone could give me a bit of advice on feed rates and amps for different materials and thicknesses.

    I noticed that the two small circles were a bit oblong.  I’m wondering if I was going too fast.  I was using 15mm/s feed at 40 amps on 3mm steel.  I was getting a cut width of about 1mm, so in the tools of estlcam I made a 1mm bit profile.  Is this the correct thing to do?

     

    I had this in the start cut section of estlcam:

    G01 z0 f200
    M106
    g4 s0.7

    But it doesn’t seem to have paused after starting torch.  Is that not what g4 s0.7 does?

    Cheers.

    #69999

    Ryan
    Keymaster

    I haven’t had any experience with a plasma on a cnc, only free hand. I would set the tool path to the thickness of your kerf.

    g4, yup that is 0.7 seconds. Did you place it in the plasma section?

    About the oval. First thing I would say is check your pulleys, and make sure you start your machine square by measuring from the rollers to the corners and matching the pairs.

    #70019

    Damien
    Participant

    lol, I had to lookup the meaning of kerf 🙂

    Yeah I put the g4 in the plasma section.  Might extend it a bit.

    I think you might be rite.  I don’t think I started the machine square for that cut.  There is a good bit of flex with it.  Might try the dual endstops.

    Is there a way of zeroing the origin point through the lcd, or can it only be done through computer?

    Thanks.

    #70020

    BT
    Participant

    There are a couple of options.  The simplest is to just reset the controller (or cycle power to it).  A more complex route is to change the menu in the firmware to replace one of the custom menu items with the “G92 Z0 X0 Y0” command – search for CUSTOM_USER_MENUS in Configuration_adv.h.

    #70025

    Damien
    Participant

    There are a couple of options. The simplest is to just reset the controller (or cycle power to it). A more complex route is to change the menu in the firmware to replace one of the custom menu items with the “G92 Z0 X0 Y0” command – search for CUSTOM_USER_MENUS in Configuration_adv.h.

    Thanks I’ll have a look at the firmware option.  I don’t like resetting the controller because there can be a bit of movement when the axis relax on a reset.

     

    #70032

    Johannes
    Participant

    Thats awesome!

    #70033

    Johannes
    Participant

    would you mind sharing the stl for your toolmount for the torch? I have the exact same, so it would be awesome not having to scetch it out my self

    #70057

    Damien
    Participant

    The forum wont allow me to upload .stl’s

    #70084

    Ryan
    Keymaster

    Zip it first, but it is better to add it to thingiverse instead.

    #70204

    Damien
    Participant

    Here you go.  The one with T is upper most piece.

    #70205

    Damien
    Participant
    #70206

    Damien
    Participant

    Think I got it 🙂

    https://www.thingiverse.com/thing:3117888

    1 user thanked author for this post.
    #70207

    Johannes
    Participant

    Great! Thanks a lot!

    #70404

    Damien
    Participant

    Does anyone know how to change direction of tool paths in estlcam?

    When using lead in, a hole path is clockwise, and a part path is anti-clockwise.  It needs to be the opposite way around for better plasma cutting.  I read somewhere that this can cause oblong holes.

     

    Cheers.

    #70412

    Ryan
    Keymaster

    Not sure why it would matter with a plasma but to switch directions switch between climb/conventional milling in the settings.

    #70677

    Melvin
    Participant

    This is my end goal with my new MPCNC I am currently building. Good Job.

    #70679

    Matthew Basaraba
    Participant

    Not sure about the CAM you are using but in Omax and FlowCAM softwares the direction is based on the side of the cut when you select the feature, I cant remember if PlasmaCAM did the same or not. (This shows up in Solidworks/HSMWorks CAM also when doing 2D Profiles)

    Although it shouldnt effect the quality of a cut which direction it travels you want to make sure that it is cutting the correct side. When cutting a circle out on the inside of a part, the cut should be offset in ward. This compensates for the cut curf (spelling?) the width of your cut so the circle will be the correct size. If it is cutting on the outside of that same circle it will be too big by half your curf (from the offset) plus the width of the cut.

    #70868

    Damien
    Participant

    Apparently it has to do with the way the plasma spins.  It makes the right side of the cut better.

     

    I’m making a floating z mount at the min, and modding my plasma cutter to work with pilot arc.

    I’ll keep you updated.

     

     

    #71537

    beetlejuice0331
    Participant

    Your MPCNC setup looks larger than 30″x30″ and it also looks like your using the electrical conduit.  Are there issues with flexing?  What plasma cutter are you using?

    #71538

    Mike
    Participant

    Check your plasma cutter’s operator manual, it should have info on feed rate, kerf width compensation, torch heigh, etc..

    Here is a hypertherm one for reference

    https://drive.google.com/file/d/0B2HcxobKqAQHU2RhZ21BcW9YTjg/view

    #71561

    Damien
    Participant
    1. Your MPCNC setup looks larger than 30″x30″ and it also looks like your using the electrical conduit. Are there issues with flexing? What plasma cutter are you using?

    My cutting area is 1 meter by 1 meter. Yes I am using 20mm conduit. I don’t see any issue with flex because the torch is not touching the piece.

     

    Check your plasma cutter’s operator manual, it should have info on feed rate, kerf width compensation, torch heigh, etc..

    Here is a hypertherm one for reference

    https://drive.google.com/file/d/0B2HcxobKqAQHU2RhZ21BcW9YTjg/view

    My plasma cutter is a cheap Chinese cut50 nock off. Not much instructions, and nothing about cutting heights and feed rates. I gets best cuts at around 1mm height.

     

    I have made a floating z mount which zeros before every cut, but I think I need a torch height controller. Does anyone know how to integrate one with the mpcnc setup?  Or know how to diy one?

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