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  1. #25
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    Default Re: Optimum MH25V

    The parts are ordered and will arrive under warranty. So all will be sorted out, I just have to be patient.

    When I will make the conversion I will be using Delta 750 W AC servos. X and Y direct drive and the Z with 1:2 reduction. I still have to decide if the reduction is enough to prevent the head from lowering while not powered, or I need a brake.

    For the controller I plan to use 5 axis SZGH controller: SZGH-CNC1000MDcb-5 5 Axis CNC Controller For Milling Machining Center

    It is actually a 3+2 and I like the option to add a 4th or even a 5th axis in the future (if needed or even possible for this machine). Also it is not clear to me if using the ATC function all 5 axes are available for machining or 1 axis is repurposed for ATC. Therefore considering the price delta between 3 axis and 5 axis versions is not that dramatic I will get the 5 axis one.

    BTW: I checked the spindle inside taper concentricity with a dial indicator and is spot on. Could not get the dial needle to move while rotating the spindle by hand. Checked it in 2 places. Could not be happier.

    Sent from my SM-A520F using Tapatalk



  2. #26
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    Default Re: Optimum MH25V

    Quote Originally Posted by DLF View Post
    ...
    Also it is not clear to me if using the ATC function all 5 axes are available for machining or 1 axis is repurposed for ATC. Therefore considering the price delta between 3 axis and 5 axis versions is not that dramatic I will get the 5 axis one.....
    It would depend on how your tool change works. If it requires Step/Direction signals then I think it would use up an axis. If it just needs signals to rotate via relays (for direction) and other standard digital I/O then you would not need to use an axis.

    I have a 2 axis lathe controller which I hope to fit soon and although my lathes turret utilises a servo motor for rotation it does not require step/dir signals as I have an indexing servo drive. That means I only need digital I/O to position the turret and thus do not require a 3 axis control.



  3. #27
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    Default Re: Optimum MH25V

    Quote Originally Posted by Hood View Post
    It would depend on how your tool change works. If it requires Step/Direction signals then I think it would use up an axis. If it just needs signals to rotate via relays (for direction) and other standard digital I/O then you would not need to use an axis.

    I have a 2 axis lathe controller which I hope to fit soon and although my lathes turret utilises a servo motor for rotation it does not require step/dir signals as I have an indexing servo drive. That means I only need digital I/O to position the turret and thus do not require a 3 axis control.
    Not really sure what signals are needed for the tool changer. The manual is available for download and contains a wealth of information but is written in chinglish and not all chapters are very clear. Therefore the 5 axis version seems to be the safe bet.

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  4. #28
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    Default Re: Optimum MH25V

    Well... warranty is gone

    But central lubrication system mods are progressing just fine. Started today with the Z oil channels. Guideway channels are done. Tomorrow dovetail channel will be milled.

    Milling ongoing on a BP clone:
    Oil channels
    Side oil port

    On the other side one of the gib locking holes will be used.

    Question: how do I deburr the channel sides without also scoring the guideway surface?

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  5. #29
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    Default Re: Optimum MH25V

    More milling done today. Added additional channels in the middle of Z guideway oil channels.

    And milled the Z gib. After all gibs will be done, I will have them reground.

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  6. #30
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    Default Re: Optimum MH25V

    A little progress today.

    Milled the X axis oil channels. The rear facing dovetail needed a bit more love than usual because 2 horizontal oil channels had to be drilled + 1 vertical. The horizontal ones needed M5 threads to be tapped, especially the bottom one which had to be tapped for the whole length.

    M5 grub screws were installed to block the oil pasaages and guide the oil towards the dovetail.

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  7. #31
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    Default Re: Optimum MH25V

    Nice looking work Mr...we did just about the same thing on the Grizz.

    Much later I happened on a thread on another forum that noted when you machine little slots for oil in the mating surfaces that they should be on a angle to the movement of the slide. The theory is if they're straight, the oil stay in the little trough and merely floats back and forth with the movement of the slide. If they are on an angle, the movement of the slide puts the oil troughs in a shear situation which forces the oil out into the clearance between the parts. I thought that sounded reasonable.

    Stuart

    "THE GRIZZ" photo album - https://goo.gl/photos/yLLp61jooprtYzFK7
    Youtube - https://www.youtube.com/channel/UCT2lq9obzEnlEu-M56ZzT_A


  8. #32
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    Default Re: Optimum MH25V

    Quote Originally Posted by atomarc View Post
    Nice looking work Mr...we did just about the same thing on the Grizz.

    Much later I happened on a thread on another forum that noted when you machine little slots for oil in the mating surfaces that they should be on a angle to the movement of the slide. The theory is if they're straight, the oil stay in the little trough and merely floats back and forth with the movement of the slide. If they are on an angle, the movement of the slide puts the oil troughs in a shear situation which forces the oil out into the clearance between the parts. I thought that sounded reasonable.

    Stuart
    Hi Stuart,

    I also thought that diagonal channels would force oil better between the sliding surfaces. This is the reason why I have milled the little cross channels.

    That being said, the milling is done on a BP clone manual mill located in a small-ish production environment. Therefore the available machine time is limited and milling diagonal channels required a more elaborate set-up which was time consuming (removing vise, clamping in different positions + re-installing and squaring the vise at the end of session). Instead a big vise was already installed and clamping in the vise and milling orthogonality made more sense.

    So, no crying over spilled milk. The oil channels are almost done at this point, so no going back possible anymore. How does the oiling worked out for your machine? Are you happy with the solution?

    On another thread someone stated his oil pump had enough pressure to lift the table a bit, enough to show on the surface finish when oiling was active during milling. If this is actually true then there would be no problem with oil distribution because oil will be squeezed between the sliding surfaces by the pressure alone. We shall see.



  9. #33
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    Default Re: Optimum MH25V

    The only piece oiled on the Grizz is the 'Y' saddle and the oiling system seems to works fine...it's too late for me as well, it's done and it works so no spilled milk here. I just thought it was an interesting concept on the part of the person that posted the theory of the angled oil slots.

    Stuart

    "THE GRIZZ" photo album - https://goo.gl/photos/yLLp61jooprtYzFK7
    Youtube - https://www.youtube.com/channel/UCT2lq9obzEnlEu-M56ZzT_A


  10. #34
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    Default Re: Optimum MH25V

    Oil pump arrived the other day. I just unpacked it and is big. Added a ruller for reference.

    4 liter oil reservoir, 140-200 ml/min @17-20bar pressure.

    No integrated timer. Just the motor connections, priming button and low level sensor. Control functions will be implemented in the controller.



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  11. #35
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    Default Re: Optimum MH25V

    Motor housing with the electrical connection block.

    I am very pleased with the build quality.



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  12. #36
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    Default Re: Optimum MH25V

    Made some progress with the oil grooves. Did one side of the Y.



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