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  1. #1
    Member
    Join Date
    Sep 2011
    Posts
    34

    New CnC Build. Large Granite CnC

    Good day Guys & Gal's

    I started a new cnc build a few weeks ago. It is going pretty slow as my work only really allows me to work on it during weekends. I've completed the base and busy getting ready to have my 20mm steel plate laser cut for the z-axis, then will send it of to besurfaced.
    I am still deciding on electronics but considering nema 34 closed loop steppers ( 1600oz) and a stand alone controller or mach3 as I still have a license from years ago. Size of the machine is 2m x 900mm. Working envelope is 900mm x 1.7m..320mm z-axis.

    Ballscrew's on all axis's and 25mm linears all around except the gantry has a 100mm + 35mm roller linear (not fitted yet - Waiting on 16mmx40mm flat bar for gantry). Build is slow but the ball keeps moving. current weight is just under 1 ton. linear on base is around 40-60 microns fitted currently but will re-lap & fit asap. I have lapped a smaller piece of granite within 0.008mm and know it is possible. First got to surface the table to closer tolerances as it is a little bowed. then will lap the table and redo sides for better tolerances...BLUDDY a lot of elbow grease but think it will be worth it, as it will be used to make baby granite machine bases. ) of 900mm x 600mm inspired by fox on YouTube (https://www.youtube.com/channel/UCi2...bjwwIMVqoxTeoA)
    as well as Datron (https://www.datron.com/) machines.

    The gantry was stripped of a machine I found and repurposed it. Things' are a bit rusted here and there but got a few linear's and others bit's and pieces I can use if I need to.

    Any input would be appreciated and all Nay Sayers comment's ignored xD It is not my first machine, but don't pretend I know it all.

    Some pictures to follow. Will take more the weekend,

    Welcome to the build!
    If you can Read, You can learn...If you can Learn you can do anything you set your mind to.

  2. #2
    Member
    Join Date
    Sep 2011
    Posts
    34

    Re: New CnC Build. Large Granite CnC

    Used 12mm hardened steel + a decent epoxy to glue and tension the sides. Gantry has been installed already with linears. will take a decent pic tomorrow or the weekend but here is a bad pic of it and some others.
    Attached Thumbnails Attached Thumbnails IMG_20210830_061956.jpg  
    If you can Read, You can learn...If you can Learn you can do anything you set your mind to.

  3. #3
    Member
    Join Date
    Sep 2011
    Posts
    34

    Re: New CnC Build. Large Granite CnC

    Heya guys. here is a better picture
    Click image for larger version. 

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    I've printed these bearing supports and they are more than strong enough for a start, until I can mill them out of aluminum. 2005 ball screw 4 start. Ill be 3d printing the main Z-plate as ell and cast it out of aluminum and rest will be made out of 25mm steel plate.
    Click image for larger version. 

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    Will use 8mm drop in anchors to fasten them to the granite.
    Click image for larger version. 

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    If you can Read, You can learn...If you can Learn you can do anything you set your mind to.

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