My MPCNC from Croatia (Europe)

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This topic contains 8 replies, has 3 voices, and was last updated by  Ryan 6 months, 1 week ago.

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  • #31767

    Walter Rotter
    Participant

    Finally started putting it together!

    Time is the biggest issue for me so it’s taking me forever to finish it.
    Hopefully it will do what I want it to do, mostly aluminium.

    I have quite a slow printer so it took more than 200 hours to print everything but I’ve decided to go for a totem corners and those take much longer to print than the original ones.

    Work in progres, I will be adding pictures as it comes along.

    It wasn’t my intention to make a parrot but I’ve used filaments at hand and it ended in three colours.

    Base is 2 x 15mm plywood screwed together.
    Two strips of same plywood were added for feet to screw on.
    Middle will be a place for wasteboard

    I’m using 25mm SS and M8 threaded rod for the Z
    Went for an extended tool holder

    Putting rollers together I started to appreciate all the effort, knowledge and ingenuity put into this project

    Making the feet square was quite a challenge because printed parts come together cause of a low design and it’s hard to put in screws without taking everything apart
    I’m off by a 0.1mm on the diagonal measures so hopefully I won’t be getting parallelograms instead of squares but there is another issue that I can’t explain.
    Measuring the Y axes tubes from corner to corner, right one is about 1.0mm longer. But diagonal from that corner is 0.1mm shorter so if I shorten the gap between corners on that tube to match the other side I’ll shorten this diagonal even further!
    On the other hand, I’m pretty sure that the fact that X axes tubes are not perfectly parallel but are of by 1.0mm will cause problems later on for the middle gantry to move freely.
    How to decrease the distance between two right corners without shortening that diagonal further?

    Yesterday evening I’ve put the middle gantry together and I was completely blown away by the complexity, ingenuity and knowledge behind this project!

    Hope to get it done in a next few days.
    I’ll post more as I come along

    Any ideas on how to make frame “more” square?

    Thanks!
    Regards!

    1 user thanked author for this post.
    #31775

    Ryan
    Keymaster

    Very nice looking build.

    I would not worry about the 0.1mm, measuring to that accuracy over such a long distance cannot be very reliable anyway.

    Just put it all together give it some test runs, then pre-square the machine and draw the largest square your build permits and take test measurements of that. I can’t imagine a project where anyone wouldn’t be very happy to be within .1mm of the intended dimensions.

    #31816

    Derek P
    Participant

    Looks good, though I see you have used the totem corners. I was planning to use them as well but Ryan suggested they may not have been updated for the 525cnc version. When I checked they appeared to be about 1mm out because the XY gap changed slightly in the new version. Not sure if it will have a big impact but it’s worth checking.

    1 user thanked author for this post.
    #31850

    Walter Rotter
    Participant

    Creator of the totem corners did respond to my question regarding if the corners are updated

    The are not!

    But since the offset difference is only 0.4mm, there shouldn’t be too many problems

    #32284

    Walter Rotter
    Participant

    Mechanics are finally done!

    Had some issues squaring the middle assembly (probably because of not so precise printer) but it is done now

    Movement along the Y is smoother than along the X but these are 92 Oz/in motors on 24V so moving anything shouldn’t be a problem.
    I’ve expected this because Y axis are not perfectly parallel, there is 1.0 mm difference from end to end

    Now to the electronics…

    #33684

    Walter Rotter
    Participant

    Finally got around sorting electronic in the last few days.

    I looks to me like I’ve spent more time soldering everything together than actually building the thing.

    Everything is wired up on the frame also

    Only thing weird to me is how long tool shaft and tool actually are.

    It looks like a quite a big lever to me

    It spins and moves!

    Hope to draw a crown today!

    #33685

    Ryan
    Keymaster

    You can just slide the spindle up higher to where the collet is flush with the tool mount bottom.

    #33698

    Walter Rotter
    Participant
    You can just slide the spindle up higher to where the collet is flush with the tool mount bottom.

    That is what I actually wanted to ask.

    As you can see, all 3 tool holder brackets are between bearings on the Z assembly
    This setup looked stiffest to me.

    If I would slide the spindle up those 3 cm (1″1/4), would that add to rigidity?

    I really can’t imagine all the forces acting upon the gantry so I have no idea how does moving the spindle up or down the tool mount affects everything.

    #33699

    Ryan
    Keymaster

    It doesn’t matter moving it up just gives you more usable range on the z axis.

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