Quote Originally Posted by NordicCnc View Post
First I should maybe explain what I intend to use the machine for. I want to be able to mill aluminium very efficiently and also mild steel with good results. I have seen quite a lot of people being able to do that!

I already have the servomotors I intend to use with 1605 ballscrews & 20mm hiwin linear rails. The servomotors are 180W JMC iHSV57-30-18-36, see the link for specs:
https://www.sorotec.de/shop/JMC-Serv...-min-7908.html
Ok do you intend to run a ratio on those screws/motors.? 3000Rpm is too fast for a 16mm diameter screw. Also 180w isn't a lot of power if your planning on a heavy gantry/spindle and wanting to cut steel.!

To be honest, if your wanting to mostly cut Aluminium and steel then I'd consider a different style of machine or build it from different materials. Because to cut steel correctly with a good finish and not have the machine fall apart in a short amount of time then it needs to be built very strong.
Aluminum Profile is great for a gantry on a general-purpose wood router which will occasionally cut aluminum to half-decent finish, but for a machine that's going to mostly cut aluminum and steel and too a Med/high level then you'll need a much stronger gantry built from Thick walled steel tube or plate weldment design.!! . . . You then open up other factors like now your motors really will not have enough power.

Cutting steel correctly to give a good finish with sensible tool life is very different from aluminum or wood and in my experience, it's recipe for disaster on a moving gantry router design unless it's built to handle it from the start and massively over-engineered like Boyan's machine. It must also have the correct spindle. Profile and the spindle you show are both not ideal for cutting steel.!

I've not seen your design for the router but given the spec of materials and parts, I would consider a Fixed gantry design if Cutting steels or aluminum.

Also, don't be fooled by videos you see on Youtube showing router machines cutting steel, yes they may do it for a video or two, but for how long and at what cost in terms of tool life and stress on the machine.? . . They never show or tell you this.!

Quote Originally Posted by NordicCnc View Post
So you believe I could downsize the gantry to a 80x160 profile and not notice any significant difference in cutting performance? If yes, I will definately downsize.
Given the above then for a Wood/Aluminium machine then yes easily.! . . . Steel, forget Aluminium profile of any size.