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g.grimmjow81

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Handyman by passion, engineer by profession

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10K+ Views Earned a bronze medal
CNC Contest
Contest Winner Grand Prize in the CNC Contest
  • G300 - 3D Printed CNC Machine

    Thanks, I am very pleased that you enjoyed my work. I believe that for workspaces as large as the ones you want the G300 needs some tweaking. For a net area of 1200x1200 you need profiles about 1500mm long and the 2040s for the Y tracks are too deformable, better to use the 2060s; for the X track keep 2040 but add at least another two to three central reinforcements. As already mentioned in another message, the supports of the Y tracks must be modified to accommodate the larger profiles while for the two Y carriages it is sufficient to use threaded bars longer than 2cm compared to what is indicated in the BOM.I recorded the entire assembly phase with the intention of publishing it on youtube but I didn't have time to do the video editing.To make up for this lack in the next few days I wil…

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    Thanks, I am very pleased that you enjoyed my work. I believe that for workspaces as large as the ones you want the G300 needs some tweaking. For a net area of 1200x1200 you need profiles about 1500mm long and the 2040s for the Y tracks are too deformable, better to use the 2060s; for the X track keep 2040 but add at least another two to three central reinforcements. As already mentioned in another message, the supports of the Y tracks must be modified to accommodate the larger profiles while for the two Y carriages it is sufficient to use threaded bars longer than 2cm compared to what is indicated in the BOM.I recorded the entire assembly phase with the intention of publishing it on youtube but I didn't have time to do the video editing.To make up for this lack in the next few days I will publish the Fusion360 source file in order to allow everyone to view the components and facilitate any remixes. After all, having won the CNC contest and a cash prize, it seems fair to me to release the .f3d fileWith the Fusion design, the separate BOM per component and the written description of the various steps it should not be complicated to finish the assembly. If you have any doubts, feel free to contact me even in private.

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  • G300 - 3D Printed CNC Machine

    The weight is essential to reduce the vibrations caused by the resistance of the material to be milled.Flex shafts are not suitable for CNCs: they are too light, generate a lot of friction (therefore they overheat) and do not allow the motor torque to be optimally transferred.They are only suitable for a dremel, where torque is limited, and for very short jobs.

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  • g.grimmjow81's entry G300 - 3D Printed CNC Machine is a winner in the CNC Contest contest
  • g.grimmjow81's entry G300 - 3D Printed CNC Machine is a finalist in the CNC Contest contest
    • G300 - 3D Printed CNC Machine
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  • G300 - 3D Printed CNC Machine

    the tip I used was not suitable for the job (V90 ° and flattened tip) but I am satisfied with the result and I will buy specific 45 ° and 60 ° cutters for the V Carve.feedrate xy: 500mm / s, z: 250mm / s, 2 passes. F-engrave software

    I still have track of all material orders, mostly bought on aliexpress:4x Nema23+4x TB6600 + Arduino + endstop 68.56€ (Banggood)4x 2040 VSlot (2 600mm, 2 750mm) 34.12€4 LM8UU+2x 8mm rod 6.91€30x 625zz Wheel POM 37€GT2 10mm belt+ pulleys 8.45€100x T-nut 3.86€Nuts, bolts washer about 20€ (local store)Katsu router 53.89€ (Amazon)24V 10A power supply 21.99€ (Amazon)Plywood base 15€ (local store)PLA 1.8kg 40€TOTAL 309.78€;D

    Combining two codes is complicated and you can create bugs without realizing it, especially generating unwanted delays. By keeping them separate you know the GRBL will do its job without interference.With two separate Arduinos you can update GRBL without having to rewrite and check the second code, every time.For these reasons they are deliberately kept separate, the second arduino will be able to intervene on the one destined for GRBL only by sending a stop signal in case there are errors / damages.

    but don't call it V2! will be the G300S :Dgatting serious againI am also a (structural) engineer and I know the properties of materials, PLA has a Young's modulus of 3-3.5GPa and it certainly has its limitations. However, it is not correct to make comparisons between materials based only on Young's modulus; eg Shapeoko steel plate is 3.42mm thick, other machines have 5mm aluminum plates, my little one has 10mm PLA plates.In terms of flexural stiffness (E * J), which for the uninitiated is directly proportional to the cube of the thickness, we have these results:Aluminum (68GPa) 8500, Steel (210GPa) 8400, PLA (3.5GPa) 3500.Certainly my CNC has a weaker structure but it's not that bad.

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  • G300 - 3D Printed CNC Machine

    It is nice to exchange opinions and advice with you. :DI also noticed that some projects have undergone numerous revisions but I think it is an integral part of this hobby. If there is something wrong, you improve and learn something new. I almost appreciate the learning phase more than the actual realization of the objects ...If you look at the 3D printed parts, almost all of them are simply plates with holes, I have already used a very essential geometry, if you want you can already make them in steel. However, some pieces are easier to print than to work them in steel: the Z carriage, the reinforcements between 2040 and the 4 Y supports in the corners. I didn't want to put together too many heterogeneous elements and so I chose to do everything in PLA.

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  • G300 - 3D Printed CNC Machine

    Thank you

    As for the X carriage you can put 2 central reinforcements.For the two Y rails, if they are very long, you can use a 2060 profile; the rectangular holes in the supports at the ends must be raised (or lowered) to insert in 2060 and, as regards the two carriages, just use threaded rods 2cm longer.

    fixed, BOM is available now

    Thank you!

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