2020 CNC 10mm Linear

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Having built a Mostly Printed CNC which is a fantastic design and machine, I'm completely hooked. Between software compilation and testing, I have the time to work on designing my own CNC from scratch in Tinkercad, pictured here. Inspired by MP_CNC, this design will allow me to easily switch between CNC, 3D Print, and Laser Cutting/Engraving heads. My goal is to build a solid machine with doubled-up linear supports for added strength and rigidity, perfect for larger builds. Using 10mm Linear shafts/bearings will keep accuracy high, while additional support bearings running on top of 2020 or similar extrusions will prevent sagging and aid in precision. I'm designing and building the machine from the inside out, one axis at a time - Z then Y then X. Cost-wise, this build may be slightly more expensive than Mostly Printed CNC to construct, but with good suppliers of 2020 extrusion etc., it should not be excessive. Replacing 2020 with 20x20 steel box section or even 20x20 Hardwood is a viable option if these materials are readily available. I've already spaced 2020 as a T Slot base for my MP_CNC, which has been successful so far. Initially, I plan to use the same bed for this build. My goal is to release each axis after it's assembled and tested, both STL and Tinkercad files included. The first printed part was a failure in terms of strength test - I forgot an important rule: "design for printing, not just for function". The direction the plastic is laid down is as crucial as where it is laid down. Third time lucky, I hope! ZY_Carrier(1).stl ZY_Carrier(2).stl ZY_Carrier(3).stl Main Z axis carrier combined with Y axis Bearings. Print with 4x top/bottom/Shell 0.25mm @ 60% fill. Supports are advised. Description: Mounts the Z axis assembly sides onto the Y axis Linear Rods and Extrusions. Additional hardware used: 4x LM10 Linear Bearings 4x 608z Bearings 4x M8x35mm with NyLock Nuts (608z retention) 18x M4x8mm with T_nuts (2020 extrusion attachment) 8x M3x35mm with Nuts (LM10 retention) 2x 14mm 2020 aluminum profile (Horizontal frame) 2x 180mm 2020 aluminum profile (Vertical Frame) 2x 500mm Linear shaft (Y Axis Shafts) 2x 500mm 2020 (Y Axis 2nd carrier strength/support) 7 Jan 2016 Back from travels, rested and ready for work and play. I started printing and testing the Z Carriage today - rough up picture loaded. Assembled and uploaded the first part of the Z axis carriage: Top, Bottom, and Spacer. You'll notice my Z axis is short - I have other machines for depth on the Z axis. Adjusting the length of your Linear Shafts and Lead Screw will give you extra height on the Z axis legs, which will also need adjusting accordingly later in the build. 8 Jan 2016 Time's tight today, so I designed and started printing X axis carriages - when two parts are printed, I'll see if my sums add up or if 2+2 equals 5! 9 Jan 2016 Not a lot of time today, but I designed the back plate for the Z-axis. Other hardware should arrive this week to assemble properly using some long bolts to dry fit at the moment. 11 Jan 2016 Another busy day, but I had a thought and knocked together a part also useful for MostlyPrintedCNC: a bed leveling leg using a pair of M8 nuts and bolts. A bed can be leveled by adjusting the 4 corners rather than the legs. 17 Jan 2016 A dose of the FLU has had me laid up for a few days, so I haven't been documenting all changes for a few days. However, I've done some complete reworks on several parts and now have a mostly free-standing unit ready for mounting drives and motors. Progress is well ahead of schedule - I'll update documentation this week as hardware needed to complete assembly arrives. One or two cable ties were utilised while waiting. Experimenting using 10mm of 22mm heatshrink tubing to tyre the 608z bearings appears to be good, but I need to test durability when testing. Amended the X_axis Carriers now printed as one piece and V slotted on bottom of print to prevent anyone else from cracking a glass when removing from bed. 18/01/16 Z Axis reworked minor changes.