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  1. #85
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    Mar 2017
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    766

    Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Quote Originally Posted by ger21 View Post
    That claims .015% per 1% of moisture content change for baltic birch (finnish birch).
    MDF is .05%, which means it shrinks and grows 3x more than baltic birch.

    Any wood construction should be sealed as well as possible, which will greatly reduce movement.
    i use a sealant on wood but the issues for me usually arise from the moisture that is already in there. The walnut stock blanks I buy can be considered dry enough to use when moisture gets down to 6%. I have never seen any with 0%.

    It's not really an issue on a deer rifle. It's a big deal for me though because I use the stocks as master plugs when making rigid molds (for carbon fiber). If the wood expands, even a little, it either gets stuck in the mold or the mold cracks. Or, I have indexing issues when I make the second mold half.

    I have gotten around thus issue by making resin castings in silicone before making the rigid molds. Now that my cnc machine is up and running though, it would be nice to be able to use wood directly. I am going to order some Baltic Birch this week to try.

  2. #86
    Registered
    Join Date
    Nov 2010
    Posts
    1

    Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Attachment 422760
    I built this machine to cut wood, aluminum and mild steel.
    The frame and gantry are steel, the Z axis is mostly MIC6 aluminum.
    The X and Y axis are chain drive and the Z axis is ball screw.
    I use linear ball bearings everywhere.
    I can cut up to 22" x 14" and I hold repeatable tolerances of 0.002"
    This is all custom made and the final tally was just under $4,000.
    All the parts are purchased from eBay, amazon and automation direct.
    I can change the spindle from the mill head (pictured) to a router head.
    My free travel speed is 300 in/min (I've had it up to 600)

  3. #87
    Registered
    Join Date
    Oct 2004
    Posts
    65
    Quote Originally Posted by atomictow View Post
    Attachment 422704
    I built this machine to cut wood, aluminum and mild steel.
    The frame and gantry are steel, the Z axis is mostly MIC6 aluminum.
    The X and Y axis are chain drive and the Z axis is ball screw.
    I use linear ball bearings everywhere.
    I can cut up to 22" x 14" and I hold repeatable tolerances of 0.002"
    This is all custom made and the final tally was just under $4,000.
    All the parts are purchased from eBay, amazon and automation direct.
    I can change the spindle from the mill head (pictured) to a router head.
    My free travel speed is 300 in/min (I've had it up to 600)
    Can't see the attachment.

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