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  1. 29-12-2011 #15
    MikeyC38's Avatar
    Lives in Bedfordshire, UK, United Kingdom.
    MikeyC38
    Last Activity: 04-03-2024 Has been a member for 9-10 years. Has a total post count of 146. Received thanks 13 times, giving thanks to others 72 times. Referred 1 members to the community.
    Quote Originally Posted by JAZZCNC View Post
    Mikey now Knowing a bit more about your plans to use a single screw and looking at your design again then I think you may want to reconsider the width of the gantry and make the bearing spacing wider.! . . .That looks awfull narrow for a single ballscrew design making racking a big possibilty.? . . .How wide is it.?
    It is currently 125mm. I have updated the Z Axis design as you and Jonathan suggested and I was coming to the same conclusion as well. So the gantry sides are up for redesign. Perhaps 175 - 200mm width and up the material thickness to 20mm should do the trick. Eliminating the 'S' shape to make manufacture easier. My thoughts are that the router tool bit should ideally lie between the gantry bearings to reduce racking. Is this true? In the current design it does not (see side shot).

    Thanks for the tip on using the toolplate in the accuracy-critical areas - should save costs

    RegardsMike
    Attached Thumbnails Attached Thumbnails Click image for larger version.  Name: My_CNC_4l_hidden_lines_side.jpg  Views: 413  Size: 46.0 KB  ID: 5119   Click image for larger version.  Name: MRC Z Axis 4.jpg  Views: 2089  Size: 70.6 KB  ID: 5120  
    Last edited by MikeyC38; 29-12-2011 at 03:19 PM. Reason: added revised drawings
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