1. #1
    Hello guys,
    I already had build a 3D printer in 2013, I started to get bored with it, so I start to see some CNC videos on internet about CNC routers and I thanked: I can do it!!!

    So I made a little research about homemade CNC's and I find out that I will need:
    -Control system
    -Stepper motors + drivers
    -Transmission (belt's + pulley's)
    -Ballscrews
    -Linear rail/rods
    -Metallic structure
    -Spend little money as possible

    So after that I went to my backyard and I found some 50*50mm steel tubes, perfect for the structure!
    I went to the scrapyard and I found some aluminium tables with 15mm linear rails that looked perfect for X&Y axis and a linear structure with 20mm rod's that was good enough for Z axis.

    I searched on ebay and found Nema 23 with 270oz-in with TB6560 driver + 24V power supply and mach 3 interface for a reasonable price.
    The belt's and pulley's were ordered from www.bepltd.com, very nice guys, aluminium pulleys with 20&40 teeth for 1:2 ratio and HTD 3M belts, perfect for very small or no backlash.

    After some time I found out my computer was not able to connect to Mach 3 interface via LPT1... So was time to search for USB solutions, and i found GRBL.
    After that I ordered a One CNC V3 and an Arduino Uno from Ebay, perfect for the job.

    After lots of welding, drilling, tappering, ect the cnc was running perfectly, almost squared!!!

    At that time I explored the limits of the machine, and i find out that I abused with microsteps. The machine was too precise, too slow and with almost no torque.
    Time to do some research:
    -Calculation torque Vs microsteps & step/mm to achive resolution Excel link:
    https://www.dropbox.com/s/lhz4ht3kh0...ixos.xlsx?dl=0

    With this excel I understand why we should not abuse of microstepping, and why is important to choose a pretended resolution to you CNC machine.
    An important factor is also driver voltage, TB6560 only are able to have a input voltage of 30V, this is a limitation to achieve max torque at higher stepper motor speed.

    Spindle was a a very difficult choose since I don't really know what the machine can handle, so i went for 0.8kW+VFD chinese spindle water cooled from ebay, now I'm a bit regretted due collect 11 isto small(max 7mm mills).

    Material:
    CNC Structure & Parts
    Steel tubes: Backyard
    Aluminium parts: Bought on junkyard
    Fixation: Welded steel tubes & screws

    Linear rails: Came toghether with aluminium plates
    Linear rails X&Y axis: 15mm wide
    Linear rod Z axis: 20mm

    Stepper motors: Nema 23 76mm 270oz-in (1.6N-m)
    Driver: TB6560 + 24Vpower source
    Control: One CNC V3 + arduino Uno + GRBL

    Ballscrews: 1605 (16mm & 5mm/rot)

    Belts & Pulleys:
    Ratio: 1:2 (20x40 teeth)
    Belt: HTD 3M 9mm wide

    Spindle & VFD
    Power: 800W
    RPM: 24000
    Collet: ER11 (max 7mm)
    Water cooled

    Click image for larger version. 

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    So enough of talk and lets see the machine working!!



    Next steps:
    -Add endstops X,Y & Z
    -Mill Aluminium Spindle brackets
    -Protect rails and ballscrews from chips.
    -Make a box for CNC (maybe soundproof)

    I know this is not a perfect CNC, but for the first one I'm proud of it!

    If you have any idea or improvement please share, Thanks.

  2. #2
    Welcome to the form.

    If you have any idea or improvement please share, Thanks.
    Change your drives to AM882's and up the PS to 68V
    ..Clive
    The more you know, The better you know, How little you know

  3. The Following User Says Thank You to Clive S For This Useful Post:


  4. #3
    Quote Originally Posted by Clive S View Post
    Welcome to the form.


    Change your drives to AM882's and up the PS to 68V
    What kind of improvement this will bring? More speed & torque?

    Thank you

    Enviado de meu Redmi Note 4 usando Tapatalk

  5. #4
    Quote Originally Posted by laranjas3 View Post
    What kind of improvement this will bring? More speed & torque?

    Thank you

    Enviado de meu Redmi Note 4 usando Tapatalk
    Yes, and they will be good for your next build
    ..Clive
    The more you know, The better you know, How little you know

  6. #5
    Hello guys,
    So I'm doing 2 Aluminium brackets for my 0.8kw spindle.
    Click image for larger version. 

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    I could do it by milling an aluminum plate, but long time ago I want to make a full video of lost PLA on plaster mold for aluminium casting.

    So how I will document this:
    Part 1:
    -Fusion 360 modeling
    -Slic3r Gcode generating
    -3D printing
    -PLA welding with soldering iron

    Part 2:
    -Make of plaster mold
    -Dry of the mold & melt of PLA
    -Aluminium casting

    Part 3:
    -Fusion 360 CAM
    -Mill the aluminium bracket to the spec


    Here you have the first video (Part 1/3):



    Any idea os suggestion?

    Thank you

  7. The Following User Says Thank You to laranjas3 For This Useful Post:


  8. #6
    Hello guys,
    Today I completed the part 2 of the video, the plaster mold preparation and aluminium casting.

    Click image for larger version. 

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    I hope you enjoy.

    Thank you

  9. The Following User Says Thank You to laranjas3 For This Useful Post:


  10. #7
    Thanks for the comment!

    I tried to mill the parts yesterday with some drawbacks:
    -Too much RPM & worn out tool
    -New tool with 12k rpm milled the aluminium with goos quality
    -M30 at the end of Gcode that broke my carbide tool -_-

    The CNC broke the mill with lots of class!

    Check the video:


    Thank you guys.

  11. The Following User Says Thank You to laranjas3 For This Useful Post:


  12. #8
    Hello guys,
    Finally I used the CNC to mill the spindle brackets, I hope you enjoy:


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