Welcome to Our Community

Some features disabled for guests. Register Today.

Drag knife question

Discussion in 'CNC Mills/Routers' started by artfuturo, Feb 25, 2018.

  1. artfuturo

    artfuturo New
    Builder

    Joined:
    Jan 24, 2018
    Messages:
    10
    Likes Received:
    8
    Hi guys

    I have a question about drag knives. I am in the process of building a Workbee and among a lot of other things, I will be cutting wood veneer, very thin slate veneer (0.3-0.5mm slate on 0.5mm cotton & glue backing) and leather and probably some vinyl as well. After some research, I realised that the typical vinyl knife won't cut it with thicker materials like leather (up to 3.5mm).

    The only solution I came across consistently that seems to be capable of dealing with my rather diverse requirements was the Donek drag knife. It appears very well established, there is a lot of experience in integrating it into Vectric SW (which I am using) and it has aides to adjust the g-codes to cater for the directional moves that are very specific.

    There is only a little catch - it is very expensive, roughly about £230 if I purchase it from a UK dealer and about $294 if I buy it directly in the US.

    My questions:
    • Has anybody in this forum used a Donek knife? What materials did you cut? What were the experiences?
    • What tools did you use to adjust the g-codes for the directional changes?
    • Are there alternatives with similar capabilities that are cheaper?

    Thanks very much for any feedback.

    Cheers
    Phil
     
  2. Kyo

    Kyo Veteran
    Staff Member Builder Resident Builder

    Joined:
    Feb 27, 2014
    Messages:
    670
    Likes Received:
    677
    Knifeassy.jpg

    Hello Phil, hit up Brain for his Drag Knife files "Here". Cheaper then a good cup of coffee and free to make if you have the right scrap :thumbsup:. It is one of the projects I want to get to this year myself. I mostly want it for cutting leather and custom boxes / packaging. He has a series of videos on how to make it as well.
     
  3. artfuturo

    artfuturo New
    Builder

    Joined:
    Jan 24, 2018
    Messages:
    10
    Likes Received:
    8
    Hi Kyo

    great feedback, thanks. Do you know how you have to adapt the g-codes with this knife? Do you do it in the same way as you would do it with a Donek? Is the geometry the same as a Donek?
     
  4. Gary Caruso

    Gary Caruso OpenBuilds Team
    Staff Member Moderator Builder

    Joined:
    May 19, 2016
    Messages:
    944
    Likes Received:
    411
    Estlcam has build in feature for drag knife, i have not tried it yet, but plan on soon.
     
  5. David the swarfer

    David the swarfer OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

    Joined:
    Aug 6, 2013
    Messages:
    1,983
    Likes Received:
    1,096
  6. stuart wallace

    Builder

    Joined:
    Jul 28, 2019
    Messages:
    55
    Likes Received:
    6
    Do you happen to have a copy of this? The link no longer works. Cheers
     
  7. Giarc

    Giarc OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

    Joined:
    Jan 24, 2015
    Messages:
    2,182
    Likes Received:
    1,183
  8. stuart wallace

    Builder

    Joined:
    Jul 28, 2019
    Messages:
    55
    Likes Received:
    6
  9. David the swarfer

    David the swarfer OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

    Joined:
    Aug 6, 2013
    Messages:
    1,983
    Likes Received:
    1,096
    the bCNC GUI for GRBL can also do it, in the tools section. Note that you can use that tool to add the drag knife corners and save the Gcode, then load that into OpenbuildSCONTROL to run your machine as usual, so no need to completely switch interfaces.
     
  10. Peter Van Der Walt

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

    Joined:
    Mar 1, 2017
    Messages:
    7,601
    Likes Received:
    2,556
    David the swarfer likes this.
  11. stuart wallace

    Builder

    Joined:
    Jul 28, 2019
    Messages:
    55
    Likes Received:
    6
    Thanks y'all. I have a call today with the Donek guy to work this out-- probably first step is to fine tune the blade offset. I appreciate it. Cheers.
     

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