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  1. #1
    Looking good. You are going down a tried and trusted route with this design so far so should be ok.

    p.s. As I write this it is a cold, dark, rainy morning - jealous of your views and weather!
    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

  2. #2
    Looking good. You are going down a tried and trusted route with this design so far so should be ok.

    p.s. As I write this it is a cold, dark, rainy morning - jealous of your views and weather!
    Thanks mate, I spent 12 months in England many years ago. The people were heaps of fun but I don't miss the constant drizzle and gloom.

    I have 2 different ideas in mind. Can people please comment on which they think is better or if I have completely dropped the ball suggest a better design altogether.

    Gantry Frame Design 1
    Click image for larger version. 

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    Pros
    Seems to be a more conventional design. Maybe better Braced then alternative
    Cons
    Heavier 23kg
    • Spindle will be slightly in front of leading edge of front gantry y axis linear rail block. Could lengthen gantry from 250mm to 300mm to fix this or could reduce box section from 200x100x4 to 200x50x4 don't really like either option.
    • More chance of warp due to more welding
    • More complex to work with, holes and relief cuts needed to fit necessary components in back of gantry.


    Gantry Frame Design 2
    Click image for larger version. 

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    Pros

    • simpler to build
    • Spindle is within leading edge of linear guide maybe more stable (spindle not drawn just calculated)
    • lighter (20kg) just frame as shown
    • Easier to add componentry to back of gantry

    Cons

    • ? Maybe less rigid due to having no back bracing on the gantry.
    • Fixing the 2 y axis linear guides to the back of the gantry will be more difficult


    So which broad design do you think is better and why? Also is weight going to be a problem? Maybe another 30 ish kg to add to gantry with steppers, guides, z axis etc. Will 425oz steppers be too weak?
    Thanks for any advice given!

  3. #3
    Hi, nice design, I think you are off to a great start. Will be following your progress :)


    I would go with option 2, because it will be a little easier, but equal in strength. The center of gravity on the blocks will also be better.

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