Welcome to Our Community

Some features disabled for guests. Register Today.

Helix toolpath

Discussion in 'General Talk' started by Dale Y, Feb 3, 2019.

  1. Dale Y

    Dale Y New
    Builder

    Joined:
    Jun 20, 2016
    Messages:
    45
    Likes Received:
    6
    Running GRBL 0.9. Trying to run a helix toolpath, but so far it doesn't do what I want. While trying to travel in a circle path, I also want the tool to lower down. What it does is travels the circle path at the same level, then at the end, it drops down. is there a setting I am missing?
     
  2. Kevon Ritter

    Kevon Ritter Journeyman
    Builder

    Joined:
    Apr 30, 2015
    Messages:
    440
    Likes Received:
    178
    Yes, something is missing. Your control software has zero impact on anything. This is all decided in you CAM package. This "helix toolpath" is called is called a helical ramp. First you need a CAM package that can ramp. Second, your CAM has to be able to specify a type of ramp, in this case, a helical ramp.

    SketchUp can ramp, but you can't control the type of ramp. Fusion 360 has 3 or 4 different ramp types, one being helical.
     
  3. David the swarfer

    David the swarfer OpenBuilds Team
    Staff Member Moderator Builder

    Joined:
    Aug 6, 2013
    Messages:
    1,354
    Likes Received:
    690
    Well, GRBL just does what the Gcode tells it to do....
    Here is some example code that will use a 6mm bit to make a 10mm wide hole, 10.5mm deep, try it in some insulation foam so you can see what it does.
    Code:
    %
    (Generated by SketchUcam V1.5-814653b)
    (Bit diameter: 6.0mm)
    (Feed rate: 200.0mm/min)
    (Material Thickness: 10.0mm)
    (Material length: 2500.0mm X width: 1200.0mm)
    (Overhead Gantry: true)
    (RAMPING at 10.0 degrees)
    (Plunge Diam First)
    (Optimization is ON)
    (www.PhlatBoyz.com)
    G90 G21 G49 G17 F200
    G53 G00 Z0
    G00 X0 Y0
    M3 S30000
    (Group: _diam_10.0mm)
    G00 Z5.000
     X12.632 Y14.555
    (plungeboredepth  DEPTH=10.500  DIAM=10.000)
    G00 Z0.500
    G00 X12.6321 Y12.5546
    G01 Z0.020 F200
    G03 X14.6321 Y14.5546 Z-0.5539 I0.0 J2.0
    G03 X12.6321 Y16.5546 Z-1.1079 I-2.0 J0.0
    G03 X10.6321 Y14.5546 Z-1.6618 I0.0 J-2.0
    G03 X12.6321 Y12.5546 Z-2.2158 I2.0 J0.0
    G03 X14.6321 Y14.5546 Z-2.7697 I0.0 J2.0
    G03 X12.6321 Y16.5546 Z-3.3237 I-2.0 J0.0
    G03 X10.6321 Y14.5546 Z-3.8776 I0.0 J-2.0
    G03 X12.6321 Y12.5546 Z-4.4316 I2.0 J0.0
    G03 X14.6321 Y14.5546 Z-4.9855 I0.0 J2.0
    G03 X12.6321 Y16.5546 Z-5.5395 I-2.0 J0.0
    G03 X10.6321 Y14.5546 Z-6.0934 I0.0 J-2.0
    G03 X12.6321 Y12.5546 Z-6.6474 I2.0 J0.0
    G03 X14.6321 Y14.5546 Z-7.2013 I0.0 J2.0
    G03 X12.6321 Y16.5546 Z-7.7553 I-2.0 J0.0
    G03 X10.6321 Y14.5546 Z-8.3092 I0.0 J-2.0
    G03 X12.6321 Y12.5546 Z-8.8632 I2.0 J0.0
    G03 X14.6321 Y14.5546 Z-9.2724 I0.0 J2.0
    G03 X12.6321 Y16.5546 Z-9.6816 I-2.0 J0.0
    G03 X10.6321 Y14.5546 Z-10.0908 I0.0 J-2.0
    G03 X12.6321 Y12.5546 Z-10.5 I2.0 J0.0
    G03 X14.6321 Y14.5546 I0.0 J2.0
    G03 X12.6321 Y16.5546 I-2.0 J0.0
    G03 X10.6321 Y14.5546 I0.0 J-2.0
    G03 X12.6321 Y12.5546 I2.0 J0.0
    G00 Y12.805
    G00 Y14.555 Z0.500
    G00 Z5.000
    (plungebore end)
    (Group complete: _diam_10.0mm)
    G00 X0 Y0 (home)
    G53 G00 Z0
    M05
    M30
    %
    
     
  4. Dale Y

    Dale Y New
    Builder

    Joined:
    Jun 20, 2016
    Messages:
    45
    Likes Received:
    6
    I tried something very similar. It it does is travels the arc first, then drops in z, repeat.
     
  5. David the swarfer

    David the swarfer OpenBuilds Team
    Staff Member Moderator Builder

    Joined:
    Aug 6, 2013
    Messages:
    1,354
    Likes Received:
    690
    So in your code you have lines like this
    G03 X10.6321 Y14.5546 Z-1.6618 I0.0 J-2.0
    G03 X12.6321 Y12.5546 Z-2.2158 I2.0 J0.0
    G03 X14.6321 Y14.5546 Z-2.7697 I0.0 J2.0
    G03 X12.6321 Y16.5546 Z-3.3237 I-2.0 J0.0
    where Z changes down at the same time an arc is performed yet the controller is doing the arc and then the Z change.
    If this is the case then I don't think you have GRBL (-: I have seen an RZNC501 controller do exactly this where a spiral is commanded but an arc with a step is performed.
     
  6. Dale Y

    Dale Y New
    Builder

    Joined:
    Jun 20, 2016
    Messages:
    45
    Likes Received:
    6
    The controller I am using is the CNC Pro I bought off Open Builds.
     
  7. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
    Staff Member Moderator Resident Builder Project Maker Builder

    Joined:
    Mar 1, 2017
    Messages:
    2,302
    Likes Received:
    1,130
    Have you tried Grbl 1.1f ? gnea/grbl (out since 2017-08-01, 0.9 is quite old, 2016-03-17)
     
    David the swarfer likes this.
  8. ljvb

    ljvb Well-Known
    Builder

    Joined:
    Feb 14, 2019
    Messages:
    65
    Likes Received:
    25
    Off topic.. just noticed you are in SA.. I grew up in PE... Saw the website in your signature.. it's a little dated :)

     
    Peter Van Der Walt likes this.
  9. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
    Staff Member Moderator Resident Builder Project Maker Builder

    Joined:
    Mar 1, 2017
    Messages:
    2,302
    Likes Received:
    1,130
    Lekker man!

    Yeah born in the Karoo, spent my years working GP, KZN, and moved back home two years ago (Beaufort West - peaceful!)

    David's a little closer to PE (;
     
    ljvb likes this.
  10. ljvb

    ljvb Well-Known
    Builder

    Joined:
    Feb 14, 2019
    Messages:
    65
    Likes Received:
    25
    I spent most of my years in PE, some in Uitenhage (Muir College) and Somerset East (Gill College).. well a year each.. I hated boarding school.. I live in the US though, Washington DC area.
     
    Peter Van Der Walt likes this.
  11. David the swarfer

    David the swarfer OpenBuilds Team
    Staff Member Moderator Builder

    Joined:
    Aug 6, 2013
    Messages:
    1,354
    Likes Received:
    690
    Well life moves on, I used to spend a lot of time in the workshop and updating my website and then I got interested in Cnc and now I spend that time here on the forums instead (-: I do have a new video series planned...

    I am in Grahamstown, my father and wife grew up in PE.
     
  12. GrayUK

    GrayUK Openbuilds Team Elder
    Staff Member Moderator Builder

    Joined:
    May 5, 2014
    Messages:
    1,669
    Likes Received:
    617
    Hope you don't think I'm being nosey but; what is The Karoo - PE - KZN - GP? Is it code or something? :rolleyes: :)
     
  13. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
    Staff Member Moderator Resident Builder Project Maker Builder

    Joined:
    Mar 1, 2017
    Messages:
    2,302
    Likes Received:
    1,130
    Not at all man :)

    Karoo: Karoo - Wikipedia (PS we have a LION on the loose near town (; Fresh spoor 60km from Karoo National Park brings new hope of finding lion lost for 2 weeks )
    PE = Port Elizabeth - Wikipedia
    KZN = KwaZulu-Natal - Wikipedia
    GP = Gauteng - Wikipedia

    Just different regions of South Africa - kinda each with its own culture differences. All over though, we are all into BRAAI though: Regional variations of barbecue - Wikipedia
     
    David the swarfer and GrayUK like this.
  14. ljvb

    ljvb Well-Known
    Builder

    Joined:
    Feb 14, 2019
    Messages:
    65
    Likes Received:
    25
    And Biltong.. don't forget Biltong.. US Beef Jerky is garbage.. Fortunately being in the DC area with people from all over the world running shops... I can at least get Beef biltong, sausage rolls and steak and kidney pies. Sadly the Cadbury's they sell are UK and Canadian..
     
    Peter Van Der Walt likes this.
  15. Dale Y

    Dale Y New
    Builder

    Joined:
    Jun 20, 2016
    Messages:
    45
    Likes Received:
    6
    Been a little busy, but finally got back to my project. With little more research, I looked back and found my issue. I was trying to give the command as a full circle, rather then only 90 degrees at a time. Found out you can only go 90° max on each command. It works now.
     
    Peter Van Der Walt likes this.

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice