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HomeMini CNC MachineBuilding a Mini CNC Milling Machine from Scratch

Building a Mini CNC Milling Machine from Scratch


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DIY/ Homemade Servo driven CNC Milling Machine with Automatic Tool Changer. It’s capable of machining various metals like aluminium, steel, titanium.
The overall build took about 2 year to this point – along work and university.
Every part of this build (development/design and manufacturing) was done by myself with the help of basic tools (angle grinder, Drill press …) and a bench top lathe.
Besides the servo drive and spindle motor, it was a build on a budget. Most of the components are from industry sales. The spindle motor was sponsored by one of the companies I was working for during my bachelor studies (innospiring).

The overall plan of building a CNC Mill evolved during the process. The further I got and the more I learned, the more I wanted to achieve with this. Now it is usable and capable for building small complex prototypes of “high“ precision.

The Automatic Tool Changer was build with a friend of mine, as part of a semester project in university. A 4th and 5th Axis were also developed in the following semester (unfortunately not build yet..).

Some Specs of the Machine:
– X Travel: 240 mm
– Y Travel: 170 mm
– Z Travel: 210 mm

– max. G0 (X,Y): 14 m/min
– max. G0 (Z): 7 m/min
– Servo Power: 170 W (max.)
– Spindle Power: 2,2 kW (i = 2.5)
– Tool Holders: SK20 (max. D12 mm)

– total weight: about 80 kg
– outer dimensions: 500x500x700 mm

If you have any questions: leave a comment or feel free to contact me:
E-Mail: info@EngineeringSpareTime.de
Insta: @engineeringsparetime



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  1. This is an exceptionally engineered mill all round. Few would even consider building their own spindles.
    Seems extremely rigid for an 80kg machine too; that concrete must be ultra-high performance indeed.

  2. It was great pleasure for me, to watch this video clip. I have read almost the whole discussions with your answers. It was very nice, to read your professional opinions, written with a lot of patience sometimes. I wish you many health primarily, many successes in your professional career, and private life also.

  3. I assume you now have your degree by now. I am a CNC / Manual machinist for 45 yrs, worked in 17 shops, operated over 50 different cnc mills. From my experience with the engineers, the best ones have machining experience. You are off to a very successful career. That mill is sweet and you learned a lot. Try to incorporate manufacturing into your designs and make sure your boss knows how much $$ you saved them. Don't be bashful, toot your horn some.

  4. Awesome work, looks like it cost a fortune, until you got to the point where you could mill your own, you must have had access to a cnc to fab the parts, otherwise it's going to get into at least 20k to do just the mill work for those parts, not counting the countless ours you spent designing all of the parts, and the redo's, I think everyone has redo's….Love it, wish I could do it…..I came here with the word "mini" but should have been looking for "tiny"…..

  5. That was one hell of an impressive desk CNC mill, very well thought out, compact, and yet still super accurate from the looks of those measurements you took of your test cuts! If I may ask, about how many € did you spend on it without that toolchanger? Was the frame made out of steel, or aluminium? And what material were those black side panels made from?

  6. Amazing work! Maybe you can explain a bit more about base. There is metal (I think aluminum) plates cast in concrete? Or by UHPC you mean something else? How did you machined these parts at home wit such great precision? I'm just hawing problems with smaller parts…

  7. Just wondering, do you have any drawings of the ATC spindle? i got all the tooling to make one of my own, been trying to design one myself but i keep getting stuck and confused. even more pics of the spindle would help!

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