3D model description
A lot of people have made additions/upgrades/remixes on the original DIY Dremel CNC by Nikodem Bartnik.
https://www.thingiverse.com/thing:3004773
This is my REMIX on his work.
(For a reason that I don't know, I cannot declare my thing as a remix inside the edit form of thingiverse)
I want to give my credits and thanks to this guy (Nikodem) for the work he did , the time he spended, and all the information and inspiration he gave us with his creation.
This is my upgraded version of the dremel (without dremel anymore) CNC. My goal was to make the original cnc better , using mostly printed parts and keeping the cost as low as I can.
After working some days with the original design, I decided to do some changes that will make this cnc better.
So, I redesigned it, with double rods on the Y direction, and all the printed parts were made again (base on the source file that Nikodem gave us for Fusion 360).
I have also change the X dimension of the original size, giving 9cm more. I think this is almost the limit for the X axis dimension on this design. The reason is, that the more bigger the X axis get, the less rigid the whole construction become.
I'm still working on a new upgrade for the X axis motion, but this will be another remix.
I have tested the cnc with wood, plywood, aluminum, copper and brass, and it does a really good job. You just have to "play" with the speeds and feeds for each material.
Nema 17 stepper motors with drivers x 4
arduino uno x1
cnc shield x 1
PBS-110 Normally Closed Push Button x 6 (for limit switches)
Metallic or plastic 20x20 mm corner 90 degree angle trim for the cable chain on X and Y axis
500w spindle motor x 1
12mm stainless steel rods
T8x8 lead screw
anti-backlash lead screw nuts
608zz x 5
LM12UU x 8
LM12LUU x 2
M3 x 10, x15, x20, x25, x30 scews
M3 safety nuts
M6 square nuts for the spindle base x4
M6 threaded hex drive insert fixing wood screw inserts nuts
I will make soon an excel file (based on Nikodem's) with the full BOM
Feel free to contact me for any questions.
..and HAVE FUN!
Manufacturing settings
I have tested my parts with PETG.
I used 25% in all parts, but I had problems with the X-axis carriages as they become a little bit flexy because of their size. So I recommend 50-60% infill for these parts.
And for all other parts use 30% or more for PETG.
I think that the best solution for rigidity is ABS, but it is more difficult to print.
Tips
BE VERY CAREFULL with the dimensions of the rods! The rods MUST have a width of 12mm and not less!!
There are many parameters that will affect the system rigidity.
I have spend many hours trying to find out solutions, on how to make this cnc better.
Use anti-backlash nuts for the leadscrews. Even a small backlash will be translated in big deviation in the cutting, or at a worse scenario you will end up with broken end-mill.
Tolerances on the rods and the lm12uu bearings will also affect your machine's behavior.
Assembly
1) make the frame with the aluminium extrusions. Be careful with the verticality at the corners.
2) put the lm12uu bearings, the 608zz bearings and the leadscew nuts where is necessary.
3) assemble the spindle carriage
4) assemble the X-axis carriages with rods and spindle carriage
5) put the X-axis carriages on the Y-axis rods, and all together to the frame
6) prepare the stepper motors with couplers, and them on each axis. For the Z axis place also the leadscrew before screwing the motor.
7) fit the rest leadscrews on each axis.