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  1. #11
    Definitely A...my axis (I call it Y axis) is 850mm wide and I use a 1610 ballscrew.
    Neil...

    Build log...here

  2. i will take the steel frame route.
    there is a useful post where i've seen nice frames from Dean and Boyan... i've made a mix :-)


    Click image for larger version. 

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    I've seen a post where Dean suggest 2 fixed ends for the ball screw
    http://www.mycncuk.com/threads/8490-...x750x200/page3
    "To give you an idea I recently built a Slaved axis 4x4 router with 20mm Dia 10mm pitch screws 1700mm length Fixed/Fixed ends with 2 x 3.1Nm steppers"..

    the 2 beams supporting the rails can be slightly not parralels so an adjustment for fixed ends must be adjustable.
    if you have made something like this i'm really interested.. thanks
    Last edited by pierantoine; 07-03-2016 at 11:18 PM.

  3. Thanks to every one after many hours of reading here is what I will make.
    Here is the final version before starting the build and ordering the parts...
    Click image for larger version. 

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    the green frame could be made on a bench before the red / yellow...

    adjustable mounting of the ends...
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    the green plate is 15mm ground plate maybe. i'have found 20mm but is not ground...
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    between collet and frame (without bed)
    218mm Z up an 68 mm Z Down.
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    For the plates 40, 50, 51 supporting the carriage would it be better to have 20mm not ground or 15mm ground ?


    Do you have any comments before I start the build ?
    Many thanks..
    Last edited by pierantoine; 16-05-2016 at 01:28 PM. Reason: Any comments before starting the build ?

  4. #14
    Quote Originally Posted by pierantoine View Post
    For the plates 40, 50, 51 supporting the carriage would it be better to have 20mm not ground or 15mm ground ?


    Do you have any comments before I start the build ?
    Many thanks..
    15 Ground, if you can't machine the mating surfaces.

    Orange plate not needed, punch down from plate 51 to the nut (see pic example).



    Or, if you really want to create a box, punch down from plate 51 to plate XX but make orange plate an X shape, locate nut in the center of the X (less material than current orange plate).



    .Me
    Last edited by Lee Roberts; 17-05-2016 at 09:14 PM.
    .Me

  5. The Following User Says Thank You to Lee Roberts For This Useful Post:


  6. last version with 80x120 aluminium profile.
    Click image for larger version. 

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    I have shorten the long axis to improve acceleration / whipping

    i've read the forum and it seems that for 1500mm rm1610 could be a better choice than 2010 for acceleration reasons. do you agree ?
    Last edited by pierantoine; 08-01-2017 at 02:19 PM.

  7. #16
    Quote Originally Posted by pierantoine View Post
    i've read the forum and it seems that for 1500mm rm1610 could be a better choice than 2010 for acceleration reasons. do you agree ?
    Yes for acceleration reasons but at that length your still high chance of whip with 16mm screw. And why would you need Higher acceleration than 20mm could provide.?
    At this length 20mm is better suited and to improve things more go with 20mm pitch and use 2:1 ratio on the pulleys. Also have Fixed bearings at both ends.
    This gives the advantage of lower screw speed and higher torque. The Fixed bearings make everything that little bit stiffer.

  8. The Following User Says Thank You to JAZZCNC For This Useful Post:


  9. Hello Dean ! thanks for your answer, yes both fixed and 2:1 with htd5 15mm was planned with ali pulleys 2 grubscrews and i've seen that you also advises that using Angular Contact Bearing from Fred worth the price so i'll do like that..
    Last edited by pierantoine; 08-01-2017 at 12:49 PM.

  10. #18
    Quote Originally Posted by pierantoine View Post
    Hello Dean ! thanks for your answer, yes both fixed and 2:1 with htd5 15mm was planned with ali pulleys 2 grubscrews and i've seen that you also advises that using Angular Contact Bearing from Fred worth the price so i'll do like that..
    Would only use 2:1 ratio with 20mm pitch. If done with 10mm pitch the speed will be too low for router.

  11. #19
    Those green bars at front and back are not necessary. Dont worry about them. Its better to be open frame.
    project 1 , 2, Dust Shoe ...

  12. Quote Originally Posted by JAZZCNC View Post
    Would only use 2:1 ratio with 20mm pitch. If done with 10mm pitch the speed will be too low for router.
    for info i have nema 24 4nm steppers from cnc4u,
    This is my first router it will be used for multicut materials (aluminium, wood, polycarbonate, etc...) and i'm looking for the best resolution before speed, but on the other end i understand that for some materials.. a fast feedrate could be need, so maybe an rm2010 could be an intermediate solution...

    1 - we always see Z axis with rm1605, i assume with 1:1 or another ratio ?
    2 - For my long axis to get a 1400mm travel i could use a 1550mm rm2010 with an 1:1 ratio but will it work correctly ? (whipping...)
    if it wont work wich length would you use maximum ?
    3 - If using RM2020 for cutting aluminium do you think i can have a good resolution with a pulley change to something like 4:1

    Many thanks for your help..

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