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  1. #1
    Hi everyone!

    I plan to build a CNC router to cut parts for R/C model airplanes which has been my primary hobby for many years. I am looking for advice on the selection of linear bearings and ballscrews. Any advice on the the dimensioning of these items would be greatly appreciated! First some facts about my project.

    Working dimensions
    Cutting area 1000 mm x 300 mm
    Spindle vertical movement 100 mm

    Materials I intend to cut
    Balsa <-4 mm
    Plywood <-4 mm (up to 6 mm would be a nice if possible)
    Carbon fibre sheets <3 mm

    The design will be a box construction from MDF similar to this
    Click image for larger version. 

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    DIY CNC Router for modelers - RC Groups

    Motors and electronics
    I have already ordered these stepper motors and controllers

    Linear bearings and ballscrews
    Linear bearings and ballscrews will probably be ordered from linearmotionbearings
    items in linearmotionbearings store on eBay!


    Supported linear rails SBR20-1200mm (2 supported rails+4 SBR20UU bearing blocks)
    Ballscrews RM2005-1250mm-C7


    Supported linear rails SBR16-400 (2 supported rails+4 SBR16UU bearing blocks)
    Ballscrews RM1605-450 mm


    Supported linear rails SBR16-300 (2 supported rails+4 SBR16UU bearing blocks)
    Ballscrews RM1605-350 mm

    1] Are 1200 mm supported rails for the x-axis to short for a cutting length of 1000 mm? I suppose that this depends on how wide the gantry base needs to be?

    2] Is it correct to order the ballscrews slightly longer than the supported rails as I have seen in many of the sets available on Ebay?

    3] Is the diameter of the rails and ballscrews roughly correct considering the length and the materials I intend to cut?

    Thanks in advance!

    Last edited by CarlNicholasCarlsson; 25-03-2013 at 03:35 PM.

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