Not a MPCNC, but still kinda cool.

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This topic contains 13 replies, has 6 voices, and was last updated by  David Walling 1 month ago.

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  • #63883

    David Walling
    Participant

    A friend of mine bought a CNC machine a few years ago. He’s not electronically inclined (mostly just woodworking and welding) and he’s had problems getting it going.

    We were discussing some projects I’ve done lately with my CNC and he made me an offer I couldn’t refuse.

    My Job: To get his CNC running. It’s a platform CNC and he brought it over in his truck for me to work on at my leisure.

    The trade: He brought me a spare planer he doesn’t use anymore and he’s going to weld me up a new firebox for my smoker.

    He has all the parts (mostly). The x and y axis are moving, but the y axis is binding at the extents. I need to re-install the z axis and then install all the limit switches and get them working in mach3. He also brought a new electronics enclosure that he wants me to move everything over into.

    It’s probably a good week’s worth of work to get everything working for him working on it in the evenings. The only part I’ve found missing so far is a concentric bushing that I had to order for one of the bearings. Looking through the manual, I think everything else is there.

    The machine is a beast… it’s also very heavy.

    I couldn’t really see how I could say no to this offer. I’m getting to play with someone else’s CNC machine and get some new equipment out of the deal.

    Here’s a picture of his machine sitting on the floor of my garage.

    Attachments:
    #63892

    Ryan
    Keymaster

    Smoked meat, loaner tool, and a new tool…DEAL!

    #63895

    Jeffeb3
    Participant

    Your friend gets a fun welding project (and hopefully some smoked meat), gets rid of an unused tool, and gets expert help fixing his robot!

    Win-Win!

    How long are you to work on it before you just print an MPCNC?

    #64101

    Otto
    Participant

    Can you post a close-up of the guide rails? They look like some kind of extruded aluminium…. Would be interested to know what drives the y axis(bearings, belts, etc)

    #64102

    Barry
    Participant

    Can you post a close-up of the guide rails? They look like some kind of extruded aluminium…. Would be interested to know what drives the y axis(bearings, belts, etc)

    Guide rails are steel, bolted to extruded aluminum.

     

    1 user thanked author for this post.
    #64103

    Mitch
    Participant

    If i am not mistaken the two Nema 23 motors on the bottom run lead screws on the lowest cross piece. Unless i am confusing X and Y axis. either way the X on the upright looks like a lead screw as well. Most likely only running one Nema 23 on the X. Also the V wheels run along bent steel sides as the actual guide. At first glance that is what i am seeing.

     

    Edit: Dang, Barry got to it before i could type everything out.

    @Barry What part of Ohio are you in?

    1 user thanked author for this post.
    #64116

    Otto
    Participant

    @Barry What part of Ohio are you in?

    Please don’t say antwerp or fort wayne..
    . I might have to harass you the next time that I’m there if you do….

    #64118

    Barry
    Participant

    @Barry What part of Ohio are you in?

    Please don’t say antwerp or fort wayne..

    . I might have to harass you the next time that I’m there if you do….

    Fort Wayne is in Indiana, I drive through it going to MRRF.

    #64144

    David Walling
    Participant

    I’ve made good progress on his CNC.

    I have the y-axis running smoothly from end to end. It no longer bind at the extents. I started moving the electronics from the machine into a standalone enclosure.

    I ran into one hiccup while re-installing the z-axis. My friend seems to be a bit of a gorilla when it comes to tightening bolts. I had to drill one out on one of the bearing blocks as the hex wrench stripped out the head. Luckily it looks like he provided a few boxes of spare bolts. I’m hoping I can finish getting the Z-axis mounted tomorrow and test drive all 3 axis by the end of the week.

    #64505

    David Walling
    Participant

    More progress over the weekend.

    It was 110 degrees in the garage most of the weekend, which limited the time I spent out there. I still managed to get most of the electronics moved over to the new box.

    I started installing the limit switches and snapped my 2.5mm tap off in the first hole.

    Went back to the drawing board and saw where people have designed limit switch holders to slide into the 8020 extrusion. I think I’ll give that a try instead of what I was doing. I did order a new tap just in case.

    #64926

    David Walling
    Participant

    The work on the CNC machine is complete.

    I ended up 3d printing my own brackets for the limit switches. Those took a few iterations to get right.

    I finished moving all the electronics into the enclosure he brought me. I had to fab a few brackets for some of that as well.

    I got all the limit switches wired up and got everything working last night.

    I will say I fought with it for about a half hour before realizing the E-Stop was reversed in the software and was keeping the machine from resetting. Not sure how I did that.

    Pictures are here:

    https://photos.app.goo.gl/4NnCRqJ3j9uSfFkk7

    And a video of it homing is here:

     

    2 users thanked author for this post.
    #64957

    Ryan
    Keymaster

    I can’t stop looking at it. There are so many questions.

    Are all of the wheel s on eccentric bolts or just some, as in how are the wheels tensioned and aligned?

    #65198

    David Walling
    Participant

    Ask away. I’ll do my best to answer them from the short time I had with it.

    Only half the wheels are on eccentric bolts.

    For instance, the Z axis has the left bolt eccentric and the right concentric. The X axis has the top concentric and the bottom eccentric. The Y is like the X.

    #69157

    David Walling
    Participant

    Got some video of it cutting finally uploaded

     

     

    1 user thanked author for this post.
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