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  1. #1
    Hello boys and girls,
    After a long long time of promising myself to build a machine, I'm finally going to do it. I hope to mill/cut plastic, wood, and hopefully some aluminium up to 6mm thick. Accuracy I'm aiming for is around 0.1mm if possible.
    Here is my machine plan. I would love some constructive criticism.

    Specs:
    Y-axis supports are 40x80 extrusion.
    X-axis gantry is 80x120mm heavy duty extrusion.
    Gantry side plates are 10mm aluminium plate.
    machine base is a tooling plate of 10mm aluminium. It has a few holes here and there, which I've modelled in sketchup, so excuse those please.
    Final working area is around 440x280mm, but if I can find a bigger base plate, that would be great.
    Motors: I'm not sure, but probably around Nema 23 size, perhaps 4Nm?
    Rails will be 20mm Hiwin, or Chinese, depending on price.
    Ballscrews will likely be 1605.

    Would someone be so kind as to critique my build please? :) Note that I haven't included the ballscrews for the x and z axes yet. Still working on positioning those. Ideas?

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    Thanks all :)
    Last edited by Nealieboyee; 11-09-2018 at 10:41 PM.

  2. Quote Originally Posted by Nealieboyee View Post
    Hello boys and girls,
    After a long long time of promising myself to build a machine, I'm finally going to do it. I hope to mill/cut plastic, wood, and hopefully some aluminium up to 6mm thick. Accuracy I'm aiming for is around 0.1mm if possible.
    Here is my machine plan. I would love some constructive criticism.

    Specs:
    Y-axis supports are 40x80 extrusion.
    X-axis gantry is 80x120mm heavy duty extrusion.
    Gantry side plates are 10mm aluminium plate.
    machine base is a tooling plate of 10mm aluminium. It has a few holes here and there, which I've modelled in sketchup, so excuse those please.
    Final working area is around 440x280mm, but if I can find a bigger base plate, that would be great.
    Motors: I'm not sure, but probably around Nema 23 size, perhaps 4Nm?
    Rails will be 20mm Hiwin, or Chinese, depending on price.
    Ballscrews will likely be 1605.

    Would someone be so kind as to critique my build please? :) Note that I haven't included the ballscrews for the x and z axes yet. Still working on positioning those. Ideas?

    Click image for larger version. 

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    Thanks all :)
    Hi Nealieboyee,

    Good to see you going for a build.
    Like me i think you will like building a machine your self.

    Things i see that a lot of people do different.

    Move the horizontal rails on gantry to top and bottom of the profile instead of front side.

    The downside is that it will raise the height of the machine some 5cm


    Move the vertical rails to the moving part of the Zaxis.

    These changes will be more rigid and the spindle moves closer to the gantry


    Please take a look at the routercnc mk3 and the Davek build.


    Would end plates connecting the base plate to the Xaxis, to get the Xaxis profiles a little more rigid, be a good idea?





    https://r.tapatalk.com/shareLink?url...2&share_type=t

    Grtz Bert.

    Verstuurd vanaf mijn SM-A320FL met Tapatalk
    Last edited by driftspin; 25-07-2018 at 09:00 AM.

  3. #3
    Quote Originally Posted by driftspin View Post
    Hi Nealieboyee,

    Good to see you going for a build.
    Like me i think you will like building a machine your self.

    Things i see that a lot of people do different.

    Move the horizontal rails on gantry to top and bottom of the profile instead of front side.

    The downside is that it will raise the height of the machine some 5cm


    Move the vertical rails to the moving part of the Zaxis.

    These changes will be more rigid and the spindle moves closer to the gantry


    Please take a look at the routercnc mk3 and the Davek build.


    Would end plates connecting the base plate to the Xaxis, to get the Xaxis profiles a little more rigid, be a good idea?





    https://r.tapatalk.com/shareLink?url...2&share_type=t

    Grtz Bert.

    Verstuurd vanaf mijn SM-A320FL met Tapatalk
    Thank you for your kind words :) I've moved the x axis linear rails to the top of the gantry as suggested. I've also rotated the base plate to give me more usable space in the x direction. If I can find a bigger base plate I may use that, or even welding a steel frame....We'll see soon.
    I've also added bracing from the y axis rails to the base plate. Do you think it would really help on the x axis too? Those braces also serve as the new plates for the bearing supports for the ballscrews.

    As for the z axis, I've moved the linear rails to the moving part of the axis and added side supports to give a bit more strength.
    Anything else that jumps out at you?

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  4. Quote Originally Posted by Nealieboyee View Post
    Thank you for your kind words :) I've moved the x axis linear rails to the top of the gantry as suggested. I've also rotated the base plate to give me more usable space in the x direction. If I can find a bigger base plate I may use that, or even welding a steel frame....We'll see soon.
    I've also added bracing from the y axis rails to the base plate. Do you think it would really help on the x axis too? Those braces also serve as the new plates for the bearing supports for the ballscrews.

    As for the z axis, I've moved the linear rails to the moving part of the axis and added side supports to give a bit more strength.
    Anything else that jumps out at you?

    Click image for larger version. 

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    Hi Nealieboyee,

    Yes like that. maybe make a full box around the gantry... just make sure no play can occure... i think you have draw side plates for that.

    So what size materials would you like to machine? Z is kinda low..
    Clamping solution and spoilerboard accounted for?


    So is there a butget reason to go stepper direct mount on the bascrews?


    If not, 1610 with belt pully reduction 2:1 is popular for several reasons.
    15 teeth on stepper, 30 on ballscrew.


    BTW what are the cutouts for in the base plate? now they reduce rigidity and make the endplates redundant.

    So is the size set or still looking for the right parts to come by?


    The best advice ever offered by this forum:

    Dont buy any electronics kit / balscrews / rails , before plan is completely done and everything fits in cad.

    More experienced forum memeber can help you pick steppers psu and so on.


    I only bought stuff when i ran out of work on every step.
    This saved a lot of money for me.


    Grtz Bert.

    Verstuurd vanaf mijn SM-A320FL met Tapatalk
    Last edited by driftspin; 25-07-2018 at 11:15 PM.

  5. #5
    Quote Originally Posted by driftspin View Post
    Hi Nealieboyee,

    Yes like that. maybe make a full box around the gantry... just make sure no play can occure... i think you have draw side plates for that.
    Done and done :)

    So what size materials would you like to machine? Z is kinda low..
    Clamping solution and spoilerboard accounted for?
    I'm not too fussy on size of material. Obviously the larger the better, but space will become an issue. I've resized the machine, as shown in the images. Final footprint is now 1000x700mm..ish. Thats about as big as I can go. The spoilboard...I was thinking of 25mm MDF? Maybe incorporate that tooling plate full of holes into there somewhere. If, IF I can get my hands on enough free 40x40mm extrusion for a surface, then I may make bolt-through hold downs using inserts.

    So is there a butget reason to go stepper direct mount on the bascrews?
    Not really. I didn't even think of using belt reduction. What would be the reason to go for that over direct coupling? Resolution? As for budget, I'm putting most of it into decent linear rails and bearings, as well as the electronics. I'm trying to build the frame and mechanical side of the machine as cheaply as possible, using mostly offcut 10mm and 12mm aluminium plate.

    BTW what are the cutouts for in the base plate? now they reduce rigidity and make the endplates redundant.
    Yeah I've gotten rid of the base plate now. It was just a bit too small to give me enough cutting area for the size of the machine.

    So is the size set or still looking for the right parts to come by?
    As of now, the size is set at 1000x700. I'll be using 80x40mm extrusion that I may be able to get my hands on for free. If not, I'll weld the frame from 50x50x3 steel box section.

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  6. #6
    I'll be using 80x40mm extrusion that I may be able to get my hands on for free. If not, I'll weld the frame from 50x50x3 steel box section.
    If you can get 90x45 extrusion you will find that the spacing holes on the BK12 and BF12 bearing blocks will line up with the slots in the extrusion
    ..Clive
    The more you know, The better you know, How little you know

  7. #7
    Even if you use 1-1 belt drive, it can let you tuck the motors almost entirely within the machine envelope - reduce space and remove vulnerable sticky-out bits. There is also a feeling that it can reduce resonance effects although I have no experience of this myself. I went belt drive for space reduction, plus thought that it would allow me to change stepper-ballscrew ratio if needed. I found that this was one design decision I did get right, though, and I have stayed with 1-1. Works well for me (similar size machine).

  8. Hi Guys,

    When i was asking for advice for my build on 1605 vs 1610 with belt reduction the motorcalc.xls helped me a lot to understand.

    If i remembered correctly, it was about max needed speed vs max ballscrew rotation speed.
    1605 direct drive vs 1610 and belt reduction 2:1 opens up possibilities for higher speeds and no loss in resolution.


    I found the motorcal.xls helpfull to play with the numbers and start understanding the physics.


    https://r.tapatalk.com/shareLink?url...2&share_type=t


    PS i did alter the xls for belt reduction.

    Hope this helps,


    Grtz Bert.

    Verstuurd vanaf mijn SM-A320FL met Tapatalk

  9. #9
    Don't make the Z clearance and maximum Z movement too small because you are going to regret that. Anything less than 15cm is too small in my opinion.

  10. #10
    Hello all,
    Been a while, but this is still being built. My linear rail, bearings, ballscrews, supports etc from Fred at BST should be here in a few days. Can't wait. I've changed my design a little bit. It will now be bench mounted, so the base is a lot shorter. See below. I've also swapped out the aluminium extrusion in favour of 50x50mm steel box section. Space isn't a major problem, so I don't have any problem with the motors sticking outside the envelope of the machine. Other than that, is there any other reason I should go with belt driven ballscrews?

    Any thoughts?

    Click image for larger version. 

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