Welcome to Our Community

Some features disabled for guests. Register Today.

Toolpath drive cutter through stock at start of cut

Discussion in 'CAM' started by Pok3, May 17, 2021.

  1. Pok3

    Pok3 New
    Builder

    Joined:
    Sep 14, 2020
    Messages:
    11
    Likes Received:
    3
    This is my first cut.

    I'm using Fusion 360 and OpenBuilds Control and the OpenBuilds Touch Probe.

    When I start my job the tool cuts straight through my stock to the start of where the actual cutting should begin. As can be seen in the picture below.

    upload_2021-5-17_18-27-6.png

    Is there something specific I need to do in the CAM setup for this not to happen?

    If you look at the following screenshots you will see the heights that are defined which all look fine to me.

    upload_2021-5-17_18-29-17.png
    My setup has the Stock Point set as follow:

    upload_2021-5-17_18-33-22.png


    Any ideas?
    Should I be adding GCode manually to lift the cutter?

    Thanks.
     
  2. Peter Van Der Walt

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

    Joined:
    Mar 1, 2017
    Messages:
    9,509
    Likes Received:
    3,035
    Did you remember to Home prior to running the Job? Fusion Post uses G53 (Machine Coordinate) moves that require homing to set Machine Zero
     
  3. Pok3

    Pok3 New
    Builder

    Joined:
    Sep 14, 2020
    Messages:
    11
    Likes Received:
    3
    No Home before I started the job. I will try this tomorrow.

    So the steps would be to
    1. Load the G-Code file in OpenBuilds Control.
    2. Home
    3. Probe
    4. Start Job

    Does this look right?
     
  4. Peter Van Der Walt

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

    Joined:
    Mar 1, 2017
    Messages:
    9,509
    Likes Received:
    3,035
    Yes, Homing sets Machine coordinates.
    Probing sets Stock (Work) coordinates.
    You need both, because all offsets (Work coordinates G54-G59.1, Parking positions G28, G30, etc) are all based off Machine Coordinates - thus Homing being a critical requirement.
     
  5. sharmstr

    sharmstr OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

    Joined:
    Mar 23, 2018
    Messages:
    1,710
    Likes Received:
    1,166

    What Peter said. But know that you dont have to home before every job. Only at startup or after some errors. Typical day on the machine would be

    Start Control
    Connect to Blackbox
    Home Machine

    Load program
    Probe
    Run

    Load new program
    Probe
    Run

    Load new program
    Probe
    Run

    Shutdown machine
    Have a beer :)
     
  6. Pok3

    Pok3 New
    Builder

    Joined:
    Sep 14, 2020
    Messages:
    11
    Likes Received:
    3
    Thanks for the replies.

    I checked the G-Code for the hello world example and it has this line of code
    G0 Z7; move to z-safe height

    On the Hello World example, I can clearly see in the simulation that it lifts the cutter up on this line before moving to the position where it will start cutting.

    When I run the simulation for my job the cutter never lifts up. It just goes straight.
     
  7. Peter Van Der Walt

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

    Joined:
    Mar 1, 2017
    Messages:
    9,509
    Likes Received:
    3,035
    See docs:blackbox:hello-world [OpenBuilds Documentation]
    Is not Fusion, so does not use Machine Coordinates (easing the learning curve, OpenBuilds CAM is less intense than Fusion360). That said we still encourage you to Home, to get in the habit for other CAMs that do use Machine Coordinates

    Simulation does not show Machine Coordinate moves.
     
    sharmstr likes this.
  8. Pok3

    Pok3 New
    Builder

    Joined:
    Sep 14, 2020
    Messages:
    11
    Likes Received:
    3
    Thanks. Got it working with the advice above.
     
    sharmstr and Peter Van Der Walt like 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