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  1. #253
    Community Moderator ger21's Avatar
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    Default Re: Another First Router

    I think a more appropriate question is what would I do to make this machine better.
    The weakest part of this machine is the Z axis. Today, for just a few dollars more than I spent, I'd build a Z axis with these:
    Aliexpress.com : Buy Original HIWIN Linear Rail Guide HGR15 L250mm rail with HGW15CA linear Sledges Carriage from Reliable rail suppliers on BST AUTOMATION | Alibaba Group

    would u still go with the rollerblade bearing and pipe system?
    If I was on a very tight budget, yes. It works very well, IF you can pull the bearings very tightly to the pipe. I'd also consider going with square steel tube, as it would minimize the small amount of wear I get on the round tubes.

    Rigidity is the most important factor in getting a good working machine.

    Keep in mind that I started building this 13 years ago, when DIY CNC was in it's infancy. Today, you have a lot more options.

    Yes, I am building a new machine. I've been designing it since before this one was finished, and have been gathering components and making small parts here and there for a while. The goal is to build the highest performing machine possible, using mostly wood for construction. Total cost will be upwards of $5K. Thread is here:
    http://www.cnczone.com/forums/cnc-wo...0-autocad.html
    The design started here:
    http://www.cnczone.com/forums/diy-cn...ew-design.html

    The design still isn't fully complete. I work on it when I can find time.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  2. #254
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    Default Re: Another First Router

    Hi Gerry,

    I'm curious if you ever did any measurement of this machine wrt to accuracy and repeatability. This could perhaps give some perspective on the capabilities of a wooden machine. I read the entire thread (I think) and don't remember seeing any posts on the topic but perhaps you posted somewhere else?



  3. #255
    Community Moderator ger21's Avatar
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    Default Re: Another First Router

    Imo, a wooden machine can be every bit as accurate and repeatable as a steel or aluminum machine, if built properly. Within reason, though. I wouldn't build a wood machine if I needed to hold .001" tolerances, although it's probably possible to do so.

    After the initial setup 8 or so years ago, I've not really checked it or measured anything. My parts are always the size they're supposed to be.
    All the parts on this page were cut with it, and these are pretty demanding as far as accuracy and repeatability goes.
    JointCAM Gallery

    Accuracy of a machine is mostly dictated by the components you use, whether acme, ballscrews, or rack and pinion.
    And as long as the machine doesn't have so much flex that it can flex out of position, repeatability on any machine will be pretty high. You are using a computer to control movement, and the machine will always return to the same place.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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