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Suzie Model One - CNC Machine

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  • Suzie Model One - CNC Machine 3 months ago

    Hi,
    I will try to respond to every question or how I’ve solved the problem.

    TOOL MEASURING AND FIXED Z-PROBE
    The Z-Probe works as an “always on” button. The GRBL firmware uses G38.x to probe the position of the tool based on the point it reconnect again.
    This is the code I use to probe:
    - G91 G38.3 F100 Z-30 //In incremental mode, probe button release slowly during 30 mm.
    - G4 P1 // wait 1 second (just because I like to see it happen).
    - G38.5 F4 Z1 // Probe button contact even slower (F is the speed cm/m).
    - G4 P1 // wait 1 second (just because I like to see it happen).
    - G92Z33.50 // Mark current position with probe tool size.
    - G0 Z10 // Raise the tool.

    So, the firmware always reset the Z position at the point where the probe tool is hard with no deformation; the spring inside keep the centerpiece in touch with the screws at the same position.
    The probe tool is not fixed because it’s harder to manually micro compensate the tool length and stock material thickness, because those numbers need to be manually feeded to software and I can’t measure thing like double tape, than just put the tool on top of stock material and measure it by probing. It’s easier and faster like this.
    I Also use scrap material if I have to drill or fully cut to avoid damaging the tray.
    This also solves the problem of “adjust the height of the Z Axis precisely” because it points always to the top of the copper layer.

    CHANGING TOOLS
    Once the machine is working, the stepper motors are always locked and can only move by software command (or really hard manual force). This means that I can send the tray back and the tool to center top (parking position) and change it without loosing the XY position. Because the force applied to unlock the tool is a rotational one it will not force the XY steppers and they will not jump any step. Then it’s only necessary to probe the Z again with the new tool and continue the work. I have already done this several times and works really well. Of course some bad thing could happen like a power failure and in this cases you will lose the XY position. By experience I always write down the Machine coordinates at Zero XY work position before start so I can manually set it to restart from a problem like that.

    DOUBLE SIDE BOARDS
    Never made a double sided board, and I always see on youtube the pin method to synchronize the second side. I guess it is ok if the pins don’t have any gap. Many of those Youtubes show the final work really fast and if you pause the video you can see some misalignment. I will probably use a different technique:
    - Make the drawing Zero at the center of one known hole for both sides.
    - Cut the track on one side.
    - Drill that side
    - Reverse the board and manually put the drill inside reference hole and mark XY zero (this avoid pin gaps because drill is perfect to hole)
    - Change tool and cut second side’s tracks

    DUST
    Yes, you are right. Dust is a problem and not only to the lungs but to the machine also. I can use a mask but Suzie don’t. By my design flaw, the Y axis moving rail is exposed to the dust. If the dust particles are thick enough they can jam the tray and ruin the work. The solution is to have the rail below the tray so no dust can fall on top of the bearings. In the other day I watched a video on youtube (https://youtu.be/d9kfzRycQzE?t=483) from a guy that uses oil to keep the dust away from air. Looks like a good solution but I didn't try it yet.

    OTHER MATERIALS THAN PCB
    Yes, I have already cutted other materials. Not aluminium tho. Once I’ve tried but it didn’t cut because I was using the wrong cutting tool, and because I don’t have any, I never tried again.
    I’ve cutted linoleum, MDF, phenolic board (very hard), PCB core, valchromat, cured painted boards and brass, among others. In my instagram you can see some of those cuttings, if you didn’t see them before (https://www.instagram.com/explore/tags/suziecnc/)

    Thank you for the comment.

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