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IndustryArena Forum > CAM Software > Uncategorised CAM Discussion > GrblGru: Free CAM and 3D-Simulation for mills and lathes
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  1. #321
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    Re: GrblGru: Free CAM and 3D-Simulation for mills and lathes

    Hi,
    i have just updated you great software to V3.49 and because i just ordered a test probe i have been running the g38.2 probe simulation to get some practice, as shown in your youtube presentation. The problem i am getting is the first row scans as it should but the subsequent rows simply follow the first row. If you are scanning into a wedge the scan ball tip gradually disappears into the wedge and you get a flat scan matrix. I did notice that the pre scan matrix “dot” pattern only shows the first row.
    Any advice would be welcome.

  2. #322
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    Re: GrblGru: Free CAM and 3D-Simulation for mills and lathes

    Sorry for the late answer, but I was on vacation.

    @jeff1000
    Hm, theoretically this would be possible. But so far, all machines are always equipped with only one tool. I think the effort would be huge.

    @Daggersuk
    Unfortunately my probe is not operational at the moment.
    Therefore I could only test the simulation with an STL object. But that worked fine.
    Do you have the problems only during real measurement or already during simulation ?
    Please check again if the 'Lift' value is big enough.
    After a measurement the probe has to lift so far that it doesn't touch the workpiece anymore.

  3. #323
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    Re: GrblGru: Free CAM and 3D-Simulation for mills and lathes

    Thanks for the reply.
    I am only using simulation mode.
    Using fresh 3.49 install and “cobra” machine & “Plane_10”, all works as it should. All scan points & X,Y,Z points correct.
    If i change to machine to “1310” and use the “Plane_10” i only get the first row of scan point displayed. When i look at the displayed coordinates all “X” rows are shown but the “Y” and “Z” are repeated values from the first row. You can watch the probe ball bounce off of the wedge on the first row then on the second and subsequent rows gradually pass through the wedge.
    The lift value makes no difference, set to very high as a test, “100”, made no difference, probe ball still passes through the wedge.
    I would like to use the 1310 model as i have a machine on its way from china.
    Thanks

  4. #324
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    Re: GrblGru: Free CAM and 3D-Simulation for mills and lathes

    @Daggersuk
    Just a short info. You are right.There is a bug in all machines where the workpiece will move.
    It is interesting that a single measurement works. I will contact you as soon as I have found something.

  5. #325
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    Re: GrblGru: Free CAM and 3D-Simulation for mills and lathes

    There is a new beta version V3.49.8 on my website
    With this version the scanning should work again.
    Thanks again for your help

  6. #326
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    Re: GrblGru: Free CAM and 3D-Simulation for mills and lathes

    Thanks for software update.
    Probe working great and coordinates correct.
    All the best from the UK, stay safe.

  7. #327
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    Re: GrblGru: Free CAM and 3D-Simulation for mills and lathes

    Beta notes V3.49.9

    On my website is a new beta version V3.49.9. It contains the first attempt to make measuring on the lathe available again.
    I have made a short video about it. It shows how to measure an STL object virtually. The calculated GCode can also be sent to the controller.
    Unfortunately my probe is not working at the moment. Therefore I could not make any tests in practice.

    Have fun with GrblGru


    https://www.youtube.com/watch?v=vmuK...ature=youtu.be

  8. #328
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    Re: GrblGru: Free CAM and 3D-Simulation for mills and lathes

    GrblGru @Linux ?

    I have been asked many times if GrblGru is also available for Linux. Until now I always had to deny this.
    But now a clever user has found a way to run GrblGru on "Wine" under Linux.
    According to him it is still possible to improve the process.

    Since I have no experience with Linux, I can only pass on the instruction on my website at the moment. (See https://www.grblgru.com/)
    I would be very happy if the Linux gurus of this forum would take a look at it.
    Necessary information and also changes for further improvements I will gladly provide.

    Have fun with GrblGru

  9. #329
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    Re: GrblGru: Free CAM and 3D-Simulation for mills and lathes

    Just a short information. On my website there is a beta version V3.49.14 with the new operation mode "Tangential Blade".

    Have fun with GrblGru

    https://www.youtube.com/watch?v=oNQF...ature=youtu.be

  10. #330
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    Re: GrblGru: Free CAM and 3D-Simulation for mills and lathes

    @JOKaija
    please have a look at the new beta version V3.49.15 on my website.
    I have reworked the lathe operation once again. Thereby g52 Y0 was replaced by G10 L20 p1 y0.
    You can also edit now the calculated GCode if something does not work.

  11. #331
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    Re: GrblGru: Free CAM and 3D-Simulation for mills and lathes

    Quote Originally Posted by GrblGru View Post
    Using O-Codes needs a special command at the beginning of the Gcode.
    This command is 'g#2g'. This activates the great library g#2g, which is a subset of LinuxCNC.
    For details please see: https://github.com/nrsoft/gsharp

    For example this should works:

    g#2g ; Important to activate the lib !!!

    #1 = 20
    #2 = 2
    g91 g1 f500

    o100 repeat [3]
    x#1
    y#2
    x-#1
    y#2
    o100 endrepeat

    I have to admit that the special command 'g#2g' came into the program later, and it's nowhere described.
    Sorry for that.

    Let me point you to the possibility to use the GrblGru macros (toolbar on the right side) for quick checking the O-Code syntax.
    For using the macro and the O-codes see link below.



    https://youtu.be/5UIVro7R7AU
    Hi. i am new here with CNC machine. i downloaded your software that command you mentioned g#2g is not working. will you help me how i use this in your software with GRBL

  12. #332
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    Re: GrblGru: Free CAM and 3D-Simulation for mills and lathes

    Hello GrblGru
    Whenever I appear it is to report a Bug.
    When importing or exporting the DXF file, an element called “bulge” with code 42 is missing.
    Attached DXF reference file.

    The math expression is:
    bulge = tan (sweep angle / 4)
    bulge = heigth / (length / 2)
    See screenshot of CamBam.
    See screenshot of Visual Studio 2019.

    Armando
    Attached Thumbnails Attached Thumbnails bulge.jpg   bulge2.jpg  
    Attached Files Attached Files

  13. #333
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    Re: GrblGru: Free CAM and 3D-Simulation for mills and lathes

    @ahmed832
    The video is unfortunately already very old. In the meantime I have continued to work on the macros.
    So I replaced the original library of Linux CNC with my own functions. The reason was that the library did not run under WinXP.
    Therefore the command 'g#2g' is no longer needed

    Please have a look at the current video about macros.
    https://www.youtube.com/watch?v=Awdb...ature=youtu.be

    Let me know if you have any questions afterwards.



    @Armando
    thanks for your feedback.

    But I have not yet understood the problem.
    The screenshots are very indistinct. Unfortunately I cannot see anything on them.

    Could you please describe in detail what is not working ?
    In which program does the error occur ? Do you import a file to GrblGru or export a file to CamBam? Is there an error message ?
    Can you provide me with a DXF file that does not work ?

  14. #334
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    Re: GrblGru: Free CAM and 3D-Simulation for mills and lathes

    Hi GrblGru
    Thanks for the quick reply, see attached the DXF file as an example.
    In the internal structure of the DXF files there are polylines with bulge code 42.
    A circle can be converted to a polyline with bulges.
    Applying programming mathematics is
    bulge = Math.Tan (Sweep / 180.0 * Math.PI / 4.0);
    See image below.

  15. #335
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    Re: GrblGru: Free CAM and 3D-Simulation for mills and lathes

    Ah, now I understand you.

    But I have to tell you that I cannot interpret the complete DXF command set. I do not use a library but programmed everything by hand.
    You can see from the amount of the manuals that there are countless commands, some of which are only available for historical reasons. There are also some commands with mathematically very sophisticated functions, whose realization would require a lot of work and time.

    The DXF import is only a small subitem in my program and I hope you understand that I want to concentrate on the most important things first. But I will put this item on my todo list.

    Thanks for your help

  16. #336
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    Re: GrblGru: Free CAM and 3D-Simulation for mills and lathes

    Dear friend GrblGru,
    It doesn't matter which version of DXF.
    In the file “autocad_2012_pdf_dxf-reference_enu.pdf”, attached, look for the word “bulge”.
    See attached a part of the source code.
    See some references:

    https://cambamcnc.com/forum/index.ph...49830#msg49830

    https://cambamcnc.com/forum/index.ph...64299#msg64299

  17. #337
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    Re: GrblGru: Free CAM and 3D-Simulation for mills and lathes

    I was wondering if it was possible to do an internal boring operation? (for lathe turning)

    Many thanks, great program (I've only dabbled with it from time to time).

  18. #338
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    Re: GrblGru: Free CAM and 3D-Simulation for mills and lathes

    @Armando
    I heard you. But as I said before, I have it on the list, but there are more important issues at the moment.


    @robertspark
    Yes, there's a trick to it. You just have to clamp your lathe tool turned 180° around its lengthwise axis.
    Then you work on the rear edge of the workpiece and you can use the normal automatic program.

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