I decided I need a small desktop CNC-Mill for PCB prototyping.
So this is what I came up with after 6 hours CAD tinkering on a rainy Sunday afternoon.
Milling area: 174 x 128 52 mm, Footprint: 348 x 354 x 350 mm
nice cad
but why not doing a head for your bot to do that ?
I have a feeling that X carriage could be slimmed-down giving you more milling length for the same exterior dimension.
Perhaps make it a two-sided mechanism with bearings placed behind the spindle motor.
@christophe_malvasio I think the robot will be not accurate enough to mill smd parts, also there is still a long way to go.
@Neil_Darlow You are right, but this would increase the leaver on the axis I don’t know if it would lead to torsion. But I will try this I think it’s a good hint thank you.
look andreas :http://www.motedis.de/shop/
@christophe_malvasio That’s where I’m buying all my aluminium profiles. 
Why don’t you just buy a chinese 3040?
@Daniel_Kruger where is the fun in buy stuff? Also I have a lot of the parts already here and I don’t like the design.
I’ll be interested in seeing what this turns into. I have a cnc mill for pcb’s and it’s invaluable. Mine uses a solenoid for the z axis control, so it floats on the surface of the pcb. That greatly simplifies having to worry about bed leveling/flatness.
@John_Bump Interesting, how does it measure the distance?
Have you looked at: https://github.com/carlosgs/Cyclone-PCB-Factory/wiki
@Andreas_Holldorfer – it doesn’t. It’s a purely two axis machine, with the z axis set up to just drop and be held down with a combination of spring force and the solenoid. Very fine manual z-axis adjustment screw so you can adjust depth of cut for v-shaped cutters. It’ll easily do even very fine pitch smd stuff: snake three traces between the pads of a 1206 resistor, for instance. I love having a pcb mill. I suspect you will not regret building one.
@John_Bump this sounds like an interesting design. Do you maybe have a link to share with more details on it?
@Yiannis_Mandravellos : it’s just an LPKF board plotter I bought off ebay and repaired. It had gotten dropped so I had to fix a ton of broken stuff and as a result I got it cheap. But it’s a fairly standard design for circuit board plotters: there are a bunch of knockoffs.
@John_Bump thank you! Will search around for more info.
small CNC’s are Hard to setup and frustrating to run. also if you make a mistake you have to start over with a new blank. with a CNC 3d printer you can grind up the plastic and remake the filament if you screw up.