1. #1
    Hi everyone, I'm building my first machine and would appreciate some feedback on the following gantry design and whether you think it would work well as a design for cutting aluminium on a high sided cnc router.

    Click image for larger version. 

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    The gantry will be about 1000mm wide, 200mm high with a 200mm base. I would use either 10 or 5mm T6 aluminium for the triangular section.

    The reason I think it would be very stiff and resist twisting very well is because forces applied to the top edge would be transmitted down the angled panel to the linear carriages attached to the base. This would make back and forth and up and down movements of the top edge very difficult. The bottom panel would resist bending in the horizontal direction due to its depth and the vertical panel would resist bending in the vertical direction due to it's height. This combination would I think be very strong and also quite light as it only has three sides as opposed to the usual four, but I'd be interested in some opinions from experienced builders because I don't want to do something silly.

    Also, would 5mm plate be thick enough or is 10 better

    Thanks in advance
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by andrew 2000; 21-12-2015 at 02:57 PM.

  2. #2
    fifa's Avatar
    Lives in bristol, United Kingdom. Last Activity: 26-11-2017 Has been a member for 0-1 years. Has a total post count of 31. Received thanks 2 times, giving thanks to others 0 times.
    The root cause of main deflection on gantry machine is twist of gantry itself. It must be very stiff... This is the reason why it is not usual design for metalworking machines.

    Think about mineral cast instead of beams. Weight-wise approx same, cost-wise probably same..., stiffness-wise much better, (also for Z beam)...


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