Welcome to Our Community

Some features disabled for guests. Register Today.

Adjsutable Z height mounted to wood base, will it work?

Discussion in 'Concepts and Ideas' started by pajamers, Dec 29, 2016.

  1. pajamers

    pajamers New
    Builder

    Joined:
    Dec 29, 2016
    Messages:
    1
    Likes Received:
    0
    Hi, Looking to build my first cnc, Just wanted to get your opinions on the machine design,

    The goal is to make pinewood cnc furniture as well as large foam models. So i have tried to make a machine that has a Adjustable Z, so it can be lowered for wood, then raised for foam.

    I have also mounted it on a wood base with cutouts to allow the x supports to move. I chose the wood base because it is cheap! and should give good rigidity to the y axis's

    Do you think this is a sound design that will meet my goals? Your opinion is appreciated.
    custom21.jpg custom22.jpg custom23.jpg custom24.jpg custom25.jpg custom26.jpg custom27.jpg custom28.jpg custom21.jpg custom22.jpg custom23.jpg custom24.jpg custom25.jpg custom26.jpg custom27.jpg custom28.jpg custom21.jpg custom22.jpg custom23.jpg custom24.jpg custom25.jpg custom26.jpg custom27.jpg custom28.jpg
    Cheers,

    Blake
     

    Attached Files:

  2. Anthony Bolgar

    Anthony Bolgar Journeyman
    Builder

    Joined:
    Jan 14, 2016
    Messages:
    354
    Likes Received:
    198
    The taller your Z axis, the wider your Y plates should be. The way you have designed it will be prone to a lot of flexing and bowing of the Z axis, you have a very long lever there.
     
  3. Rick 2.0

    Rick 2.0 OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

    Joined:
    Dec 20, 2013
    Messages:
    2,854
    Likes Received:
    1,525
    A couple more issues you need to consider. First is the amount of weight you will have swinging around way up in the air as the gantries move about. The inertial forces from that motor will impart significant prying forces on the wheel axles and over time cause looseness in the system. But this becomes a non-issue when you consider the second issue here. The Z-axis movement need not be any longer than the longest bit you have to work with. In other words, you can't cut to the bottom of a 10" block with a 5" bit. You get the 4" available into it and the collet begins to hit the block.
     
  4. Mark Carew

    Mark Carew OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

    Joined:
    Jun 28, 2013
    Messages:
    2,742
    Likes Received:
    2,407
    First thing I would say (throw in my 2 cents ;) ) is great looking Build @pajamers you have going on here and I believe it can serve your needs perfectly cutting large foam blocks and lowering down to cut the pine sheets. I do however think your Z actuator is unnecessarily too long even with the X at the top of the column height so I would revisit this. Also like Rick stated your bit length will play a main role in how you think about the dept of cut for this machine. You can feed large material in but your limited by your cutting depth. Again a lot of factors play into this such as sourcing longer bits or 3D carving and or material flipping that can make this work. It really depends on the details of the application that you are after but I doe feel your on the right track. Keep up the good work. :thumbsup:
     
    Anthony Bolgar 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