40mm finnish birch plywood CNC-router - Page 2


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Thread: 40mm finnish birch plywood CNC-router

  1. #13
    Community Moderator ger21's Avatar
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    Default Re: 40mm finnish birch plywood CNC-router

    How big is the machine?
    The thicker the torsion box, the stiffer it is.
    My gantry torsion box is about 75mm thick, with 12mm skins.
    My table is thicker.

    Gerry

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  2. #14
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    Default Re: 40mm finnish birch plywood CNC-router

    Quote Originally Posted by ger21 View Post
    How big is the machine?
    The thicker the torsion box, the stiffer it is.
    My gantry torsion box is about 75mm thick, with 12mm skins.
    My table is thicker.
    Cutting area is 400mm x 600mm.



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    Registered Biggs427's Avatar
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    Default Re: 40mm finnish birch plywood CNC-router

    Mine have a 75mm gantry with 12mm skins and ribs. (700mm long)
    100mm for base with 18mm skins and ribs. (1200mm long).

    Cutting area of 500mm x 800mm



  4. #16
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    Default Re: 40mm finnish birch plywood CNC-router

    Some progress made. Don't know if this design works or not.

    Attached Thumbnails Attached Thumbnails 40mm finnish birch plywood CNC-router-cnc-jpg   40mm finnish birch plywood CNC-router-cnc-2-png  


  5. #17
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    Default Re: 40mm finnish birch plywood CNC-router

    How will you attach the gantry to the linear trucks?



  6. #18
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    Default Re: 40mm finnish birch plywood CNC-router

    Now I have drawn rest of the machine, not very detailed though.

    cnc 3

    For the attachment I was thinking something like this.
    Untitled



  7. #19
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    Default Re: 40mm finnish birch plywood CNC-router

    A couple of things based on what I see on my cell phone.

    1. I’d seriously consider putting the X axis lead screws on the outside of the frame. This simply to make maintenance and cleaning easier. If I out have the screws where it is easy for swarf to accumulate it can impact screw operation.

    1a. Those screws also look to be small diameter threaded rod. That can be a problem. It f you must use threaded rod it should be of fairly large diameter. Better yet consider ACME or trapzodial threads.

    2. You need to separate the gantry support bearings by more. Remember round rails are not that stiff and generally the bearings fit loosely. Also how those bearings are attached to the gantry supports is very important. At the moment I don’t have a lot of confidence in the bearings I got attachment.

    3. I don’t have a lot of confidence in that gantry beam. If you insist on using 40mm ply, use two layers to thicken and make it wider. Twitter layers would also help with mechanical strength at the gantry supports. Think half lap at the gantry supports. Gantrys are commonly underengineered even with your modest span you will want the stiffest gantry beam possible. I’m not sure what your goal is with respect to the number of sheets used but it is important to allocate enough materials to the gantry.

    That is it for now.



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    Registered Biggs427's Avatar
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    Default Re: 40mm finnish birch plywood CNC-router

    Maintenance will prpbabpy be a pain with the holes. If the holes are bigger to help maintenance, it will make your gantry side less stiff.

    +1 to put the leadscrews outside.



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    Default Re: 40mm finnish birch plywood CNC-router

    Could you move the Y lead screws onto the sides? You'd be preventing them from getting lots of wood dust. That would enlarge the footprint of the machine a little, but would take advantage of the high walls you have supporting the Y trucks.



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    Default Re: 40mm finnish birch plywood CNC-router

    Thanks for critic!

    1. yes that would greatly help with maintenance! Didn't thought that.
    1a. there is no threads showing because I wanted solidworks simulation to be as smooth as possible. those are 8mm trapezoidal threads.
    2. At the moment it's 200mm should I separate them more?
    3. gantry is now 70mm and will be torsion box. Is 70mm too narrow?



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    Default Re: 40mm finnish birch plywood CNC-router

    Quote Originally Posted by Biggs427 View Post
    Maintenance will prpbabpy be a pain with the holes. If the holes are bigger to help maintenance, it will make your gantry side less stiff.

    +1 to put the leadscrews outside.
    How big impact let's say 100mm wide and 40mm tall hole would make?



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    Default Re: 40mm finnish birch plywood CNC-router

    And more questions, I have different microstepping options in my stepmotor drivers and googled, but didn't find straight answer which options are best. Should I disable it completely?
    Also, can the gantry sides be solid plywood?



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