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Which ball screws would be good for 1500 x 1500

Discussion in 'CNC Mills/Routers' started by msaeger, Apr 26, 2019.

  1. msaeger

    msaeger New
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    Hi,

    I have been trying to decide which ball screws would be good for machine that is 1500 x 1500. I am finding for diameter I can get 16,20,25 mm in overall length of 1500mm. How big of a diameter is enough for that length? Is 16 ok or should I get 20? Also what pitch is good? I see I can get 5 or 10 mm. I read people using 5 then other people say 5 is too fine and the movement would be too slow.
     
  2. sharmstr

    sharmstr Master
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    I'm not running metric, but I have 1/2-10 5 start (2 turns / inch) lead screws on my workbee 1510. No whip at all or that I can notice anyways.
     
  3. msaeger

    msaeger New
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    Thanks! I guess I don't need to get metric it just seems like what I am finding is all metric. 1/2 inch would be close to the 16mm ones.

    Got any pictures that show the screws installed in there?
     
  4. sharmstr

    sharmstr Master
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  5. WR_Rider

    WR_Rider Journeyman
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    I thought I read up on most of the builds but those 3 builds are impressive!
     
    sharmstr likes this.
  6. Rob Taylor

    Rob Taylor Master
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    There are length/diameter guides out there, but based on what I've seen, 1605s should be ok at 1500mm. It's definitely on the border of where 25mm might make more sense, but that's a lot of mass to be moving around and most people don't seem to have issues.

    I max out my 1204 and 1605s (with dovetail ways) running NEMA34s at 2500mm/min (100IPM) and 6000mm/s/s acceleration, and typically run around 1500mm/min until I can reinforce my frame some more. That's not bad in metals, but if you're looking at soft materials you might need a higher feed to cut proper chips. 1610s or 2510s are always an option, as is going to servos to get useable high-speed torque.

    Lower feeds are just an inherent downside of going to screws over belt/chain/rack and pinion, though.
     
  7. msaeger

    msaeger New
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    What would be the downside of the 1610s or 2510s? is there not enough resolution for anything?
     
  8. Rob Taylor

    Rob Taylor Master
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    Assuming steppers at 8x microstepping, you have 0.00625mm resolution, or about 2.5 tenths/a quarter thou. An order of magnitude more resolution than you need in soft materials, which is perfect, but they do tend to have one downside: cost. If you can find them reasonably priced somewhere, go for it, but since most people get the 1605s, they tend to run a bit higher and be harder to find from reputable sources.
     
  9. msaeger

    msaeger New
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    Thanks for the info! Can you give an opinion on what resolution would be good to achieve?
     
  10. Alex Chambers

    Alex Chambers Openbuilds Team
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    My workbee from Ooznest claims a resolution of 0.1mm. Given the inevitable play & flex in the whole system that's not bad for a machine using aluminum extrusions and "ACME" leadscrews. (my measurements so far indicate it achieves this or better). If you are using ballscrews the limiting factors are going to be the rigidity of your framework.
    Alex.
     
  11. msaeger

    msaeger New
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    Thanks! So if I am figuring right with the 1610's even with no microstepping I would get .05mm. So I think the 1610, 2010,2510 would be the way to go. Gotta see what they cost now.
     
  12. Knut Bøje

    Knut Bøje Well-Known
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    If you use 1/2 inch ball screw, you get whip. 1/2 inch = 12.7 mm. I used 12mm ball screw on my OX. But because of the whip I upgraded mine to 20mm.

    Her is my OX today.
    IMG_20190428_225905.jpg
     
    #12 Knut Bøje, Apr 28, 2019
    Last edited: Apr 28, 2019
  13. msaeger

    msaeger New
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    Did you use 2005 or 2010? I see everyone using the linear rails but I already bought all the v wheels so I don't want to switch now.
     
  14. Knut Bøje

    Knut Bøje Well-Known
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    I'm using 2005.
     
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  15. Giarc

    Giarc Master
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    I use the same (or similar) lead screws as sharmstr on my 1500 mm Y axis and have not seen any noticeable whip even jogging much faster then I would ever cut with it. I bought these McMaster-Carr
     
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