Can someone give me a clue in complexity of building a cnc?
There are lots of complexity’s depending on what you want. Mill, lathe, 3D printer.
Check out Reprap and Shapeoko, see what you think.
Was thinking a dremel that can move across xy plane, and then add z axis later but eventually will need a lathe
complexity? or cost?
My first build, would like it simple, and somewhat cheap. I can always build a new better model after I learn to operate it well first
I think the simple and cheap on the hardware side I’d go with a shapeoko2 you can mount a dremel on it and easily expand the cutting surface later just by getting longer extrusions. A dremel would work with it but I’d reccomend at least a trim router. You can build it from a kit in a couple hours. The electronics side is a whole other matter… You have all kinds of choices. The cheapest may be an arduino step driver combo. But kind of limits you on software. But it will get you moving learning gcode etc. If you plan on using mach3 or emc2/linuxcnc then look into a break out board and separate drivers.
I built mine over 3 or 4 weekends in a fully equipped machine shop. I bought geckodrives and used an old pc with linuxcnc to run it. I have used countless hours reading and learning. But I highly recommend it. It has been one of my most rewarding projects.
I want relatively small, to carve wax ring patters to cast
Check out a openbuilds ox has build videos with lot of detail can go 4 x 2 foot
I’m doing my with tinyg and a contractor grade router