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Piranha CNC - Strong C-Beam machine with Linear Guides

Discussion in 'CNC Mills/Routers' started by Martin.Barfoed, Jan 19, 2021.

  1. Martin.Barfoed

    Martin.Barfoed Journeyman
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    Martin.Barfoed published a new build:

    Read more about this build...
     
  2. ljvb

    ljvb Well-Known
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    Interested and watching.. Make sure as you go through the build process, you include an upgrade path from those who already have a lead machine. I would also suggest you take into account those who have the 1010.

    Side note.. I purchased my 43mm spindle mount from makersupplies.dk and am very happy with it.
     
  3. Martin.Barfoed

    Martin.Barfoed Journeyman
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    Thanks for your suggestions. Apart from the gantry plates and wheels I think all the rest of the LEAD machine will be reusable for a Piranha. We do plan to use Tensioning Nuts and Thrust Bearings but that will still be fully compatible with the LEAD. So point taken and we will compile an upgrade from "LEAD_to_Piranha" BoM as part of the project.

    Happy to hear that you have good use of the spindle mount. Thanks for your feed back.
     
  4. Mark Carew

    Mark Carew OpenBuilds Team
    Staff Member Moderator Project Maker Builder Resident Builder

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    Really nice job on this build Martin and team! I think your onto what will be a nice sturdy machine.
    I have on suggestion on the acme nuts that may help. You may want to make at least one of the mounting holes oblong to allow for some adjustment along the lead screw pitch this will help ensure that the nut blocks are in sync and not binding.
    Keep up the great work guys :thumbsup:
    nutblock adjustment.PNG
     
  5. ljvb

    ljvb Well-Known
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    Whats the ETA on design documents.
     
  6. Martin.Barfoed

    Martin.Barfoed Journeyman
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    Hi Mark, Thanks for the encouragement. We have added oblong holes for the ACME Nut holes to allow adjustment to be in sync with the lead screw thread. We have had some challenges in making the spacer but I hope we have arrived at a good design. First version of the files will be uploaded soon. Cheers, Martin
     
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  7. Martin.Barfoed

    Martin.Barfoed Journeyman
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    I hope to have them ready within a week.
     
  8. ljvb

    ljvb Well-Known
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    tap tap tap....... :) just kidding.. mostly.. maybe.. any updates...
     
  9. Martin.Barfoed

    Martin.Barfoed Journeyman
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    Did you check the file section :) I uploaded several digital files over the weekend.
     
  10. ljvb

    ljvb Well-Known
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    I did not.. I will go stand in the corner and wear my hat of shame...
     
  11. ljvb

    ljvb Well-Known
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    Do you have the entire assembled machine in step of fusion/freecad format.. getting 6mm plate here in the US seems pricey or a problem, 1/4 which is slightly thicker than 6mm plate is readily available, so I'll need to adjust everything to account for the change.
     
  12. Martin.Barfoed

    Martin.Barfoed Journeyman
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    We have now made the full assembly file. You can find it in the File scetion
     
  13. ljvb

    ljvb Well-Known
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    Thank you.. I had a half finished cad file of my own design.. but it's not as elegant as this, and why do the work when someone else can do it :) so thank you.


     
  14. ljvb

    ljvb Well-Known
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    Quick note and question..
    Note: When you make updates in the build section, can you preface the update with the date, makes it easier to see which updates occurred and when, since we don't get notifications that a change has been made in that section..

    And for the question, which you do not have to answer.. What has been the approx cost for the upgrades (material and parts, don't need the cost of manpower). I'm either really bad at finding good quality cheap parts..as the cost is approaching some of the other prebuilt machine upgrades. Right now.. for linear rails, aluminum plate (and the cost of having the plates milled using a service like sendcutsend.com since I do not trust the accuracy of my machine currently), I'm already approaching $800, coming close to the upgrade kit sold by another vender, cnc4newbies (mods, feel free to remove the reference or let me know to remove it if referencing them is a no no).

    I like this design and think it is fantastic, but once the upgrade cost reaches the cost of purchasing something already prebuilt and does not require major assembly, the benefits of modifying to purchasing changes...
     
  15. Martin.Barfoed

    Martin.Barfoed Journeyman
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    Yes, it might be a good idea to add a change log. Today i added another Render we made. We are waiting for the plates to be produced so time was spend making that :)

    Cost may very well be similar to other builds you can find. If they use similar parts they will (fairly prices) cost the same. So in that context I would consider this build as our take on how it should be done. If you go through OB forum you will also find several builds over the same theme.
     
  16. Etkini

    Etkini New
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    I just completed my build today, and it was less than $500. Those internet based services are very expensive - if you really want to get them done, contact a local machine shop and I think you'll be surprised with the price difference.

    As for the plates, I used my stock LEAD1010 to outline all the cuts and holes at a depth of .125", except for the 16mm holes and the oblong holes for the nut blocks which were full depth. It took a few hours since I couldn't go very fast or deep, but I enjoy watching the machine so it wasn't a huge deal. Just make sure your machine is square and you'll be fine. I chose to do this in 3/8" aluminum for added stiffness. I cut out the plates using a combination of my plasma cutter, metal cutting bandsaw, and miter saw. As for the holes, I finished them on my drill press.

    1/8" aluminum cutting router bits purchased from KodiakCuttingTools - $46 shipped
    Timberline 12096 12" carbide blade for my miter saw from ToolsToday - $35 shipped

    3/8" 6061 aluminum plate 12"x30" - $45 purchased locally
    Linear rails HGR15 - purchased off AliExpress from CNCCanen - $225 shipped
    Random parts from OpenBuilds (I bought way more than I needed because I can't find much locally) - $100 shipped

    I also changed the Z axis a bit, turning it around to be like the Sphinx and creating a plate to mount the router to. I needed to do that for the extra height, as I work with 2"+ thick material often. As it sits I have just over 3" of clearance, but I can slide the Z's C-beam higher and get over 4" if I need to. The video below is it running a 1" surfacing bit 3mm deep at 2500mm/min (.1" @ 100IPM). I know I could go quite a bit faster, but I need to up the limits because that's all the Control software would let me do.

    I also intend on designing an all aluminum Z axis eventually so it doesn't sit so far away from the X axis, but for now this works just fine. I used to be able to move the router with a finger as it cut, now it takes a decent amount of force.
     

    Attached Files:

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  17. ljvb

    ljvb Well-Known
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    Thank you, that is more reasonable, I was at almost $1000 in parts and service costs (if I chose to use cutting services online, I have not really checked machine shops in the DC area).. but I avoided all foreign parts because shipping was insane.. I'll check the vendors you listed.
     
  18. ljvb

    ljvb Well-Known
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    Have you thought about increasing the screw size.. I have some pretty beefy steppers, as I crank up the speed, whip is pretty bad, I am considering ballscrews, or at least bumping up to 12mm or 16mm leadscrews
     
  19. Etkini

    Etkini New
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    I use the OpenBuilds High Torque steppers, which seem to be mid-high end of the line on torque for Nema 23s. I priced 12mm lead screws and 1610 ballscrews out many times, and went back and forth on using them. I decided not to yet because at that point I would also want to go to a 48v PSU, which means I'd need a new controller - and then I'd not be happy with the rigidity vs power and I'd want to upgrade to a spindle, and then use steel for the beams and at that point it would be a never-ending battle with my bank account being the biggest loser.

    My complaints with the LEAD1010 were never speed honestly, I always felt it did a good enough job for what I needed it to do. I hated the V-wheels and thought the rigidity could use a little boost.

    One last thing I forgot to mention, the intention of the guys that developed this machine were to sell the plates or a kit eventually. When I asked them a week ago, they said they were 6-8 weeks out from being able to ship them. Just something to keep in mind if your local shops are outrageous, and with your location you might be better off branching out a little further.
     
  20. ljvb

    ljvb Well-Known
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    I actually ordered my spindle mount from them. Best option for the AMB spindle I have. I might actually wait for them to make the plates. Or at least give it a shot at milling a set one time. I can get 3 pieces of 1/4 or 3/8 12"x24" for about $80.



     
  21. Martin.Barfoed

    Martin.Barfoed Journeyman
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    Thanks for sharing the video. Fun to see others building and adding modifications to the machine.
     
  22. machinethat

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    $500 doesn't include any of the electronics right?
     
  23. Etkini

    Etkini New
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    What electronics? This is for an upgrade from a Workbee or LEAD.
     

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