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  1. #13
    Member teamloks1's Avatar
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    Default Re: First Cnc Build With extrusion

    Quote Originally Posted by davida1234 View Post
    I think one point of concern could be the side-to-side
    movement of the gantry held in place. Even though
    it has 10 bolts per side at the gantry, the bottom is
    (structurally speaking) not a 'fixed end'. It relies on
    the rigidity of the side plates and becomes a cantilever.

    Moving the linear rail to the top slot would shorten
    that cantilever. (Suggestion 1)

    Adding another rail to the bottom slot would make
    it a (vertical) beam with two somewhat fixed ends.
    (Suggestion 2)

    Attachment 414122
    thanks for suggestion,and yes the second suggestion is my original design but i saw somewhere said i dont need double rail for y axis so i go for single rail since i already order some item maybe i opt for suggestion 1

    Quote Originally Posted by HuguesP View Post
    75mm x 150mm x 600mm extrusion is 100$cad = 75$ usd here in canada,
    yeah got just got quote from my reseller that around 28$ for 1 meter length



  2. #14
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    Default Re: First Cnc Build With extrusion

    some of part already arrive its TBI motion 2005 ball screw









  3. #15
    Member teamloks1's Avatar
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    Default Re: First Cnc Build With extrusion

    just some side view





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    Default Re: First Cnc Build With extrusion

    Quote Originally Posted by teamloks1 View Post
    just some side view

    Whats with all the extra bearings on the X? IF I'm looking at it right you have two rails and four sets of bearing blocks on one side of the machine. I'm assuming the same on the opposite side. This is not a good idea. It is very difficult to get the linear rails in plane and adequately parallel with each other mounted directly to extrusions. If you don't think the rails or bearing blocks are suitable for the loads applied as a single rail you would be far better off addressing that either by larger blocks or up sizing both the bearing blocks and linear rails. You can find threads on here where guys have tired to do so with much heartache, extrusions are simply not that precise to allow closely mounted rails like you have here.

    I'm not a big fan of the Y axis arrangement either as it simply wastes hieght in the Z. You will likely loose close to two inches in Z with the wrap around gantry (Y) saddle. I'm als not a big fan of added complexity that offers little in return.



  5. #17
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    Default Re: First Cnc Build With extrusion

    Quote Originally Posted by wizard View Post
    Whats with all the extra bearings on the X? IF I'm looking at it right you have two rails and four sets of bearing blocks on one side of the machine. I'm assuming the same on the opposite side. This is not a good idea. It is very difficult to get the linear rails in plane and adequately parallel with each other mounted directly to extrusions. If you don't think the rails or bearing blocks are suitable for the loads applied as a single rail you would be far better off addressing that either by larger blocks or up sizing both the bearing blocks and linear rails. You can find threads on here where guys have tired to do so with much heartache, extrusions are simply not that precise to allow closely mounted rails like you have here.

    I'm not a big fan of the Y axis arrangement either as it simply wastes hieght in the Z. You will likely loose close to two inches in Z with the wrap around gantry (Y) saddle. I'm als not a big fan of added complexity that offers little in return.
    thanks sir for suggestion i will try to improve it back still got 2 weeks before all item arrive



  6. #18
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    Default Re: First Cnc Build With extrusion

    i think will go with this design since i can tuck the servo

    Attached Thumbnails Attached Thumbnails First Cnc Build With extrusion-side-left-jpg   First Cnc Build With extrusion-rightr-1-jpg   First Cnc Build With extrusion-front5-jpg   First Cnc Build With extrusion-front-jpg  

    First Cnc Build With extrusion-back1-jpg   First Cnc Build With extrusion-back-jpg  


  7. #19
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    Default Re: First Cnc Build With extrusion

    I like that latest design. Hope to see it running soon.

    Do remember you need to keep in mind drag chains and other bolt on components. Often these are left as after thought and it often shows.



  8. #20
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    Default

    Quote Originally Posted by wizard View Post
    I like that latest design. Hope to see it running soon.

    Do remember you need to keep in mind drag chains and other bolt on components. Often these are left as after thought and it often shows.
    haha yeah thanks just lazy to draw chain and bolt but i got it in my mind currently thinking to use 4kw atc bt30 or iso20 2.2kw



  9. #21
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    Default Re: First Cnc Build With extrusion

    some parts already arrive need to recheck everything first before cut all the plate,and checking alu extrusion, looks like they cut the size really perfect within 0.1mm.
    and i got vacuum table for size 300*400 around 400usd that i can use air compressor with it no need vacuum

    Attached Thumbnails Attached Thumbnails First Cnc Build With extrusion-photo_2019-04-08_08-39-41-3-jpg   First Cnc Build With extrusion-photo_2019-04-08_12-28-14-2-jpg   First Cnc Build With extrusion-photo_2019-04-09_20-24-15-jpg   First Cnc Build With extrusion-photo_2019-04-09_20-24-15-2-jpg  



  10. #22
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    Default Re: First Cnc Build With extrusion

    got this server case with high flow fan for 10 dollar to fit my controller

    Attached Thumbnails Attached Thumbnails First Cnc Build With extrusion-photo_2019-04-11_16-49-28-jpg  


  11. #23
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    Default Re: First Cnc Build With extrusion

    today assembling Y axis rail and allign it together to 0.0001'' and i put some sand in static part(base) still thinking should iput something in moving gantry such as expanding foam to reduce the vibration

    Attached Thumbnails Attached Thumbnails First Cnc Build With extrusion-photo_2019-04-16_18-44-25-jpg   First Cnc Build With extrusion-photo_2019-04-16_18-44-26-jpg   First Cnc Build With extrusion-photo_2019-04-16_18-44-23-jpg  


  12. #24
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    Default Re: First Cnc Build With extrusion

    Hi Team - Why solve a perceived problem before its a problem? There's lots of routers built out of extrusions and they have no vibration issues so only solve problems that exist.

    Plus why have your columns dog legged? The loadpath is from the top to the bearings so this is where material should be. To reduce weight put a hole in it but its best leave edges straight? Peter

    Attached Thumbnails Attached Thumbnails First Cnc Build With extrusion-capture-jpg  


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