Rauno's CNC router

[Rauno]

If your main goal is to cut aluminum then you need a stronger base and gantry along with a ridged Z-axis.

Recommendations for stronger design are welcome. I made a base frame design, larger rectangular tubes are 80x80x4 and smaller ones 50x50x4.

It would be a mistake to go for RM1605 for a machine this size, I wouldn't even use 1605 on a smaller router, because you still need a certain amount of speed to cut materials like wood and MDF correctly. Using 1605 means your motors are always spinning fast when cutting at higher feeds so torque is low and often very near the stall point.
RM1610 gives you all the speed you require while allowing the motor to spin slower with higher torque while cutting. Careful not to get caught up in the resolution trap either, because you don't actually need high resolution for the type of materials you are looking to cut and a 10mm pitch with micro-stepping drives will give you more than enough resolution for most types of cutting.

I choose RM1610 for the X and Y axis.

Careful with water jet cutting because unless it's cut very slowly you will get a tapered edge.

I am aware of this problem, maybe it's reasonable to mill over the important surfaces. Let's see.

I've built literally 100's of machines now using the 45x90 with my "L" design gantry so I'm probably a little biased, but it just works and pound for pound it's the strongest arrangement I've ever used. Yes, I've built and still do build machines with stronger gantry's but they are much much more expensive and complicated to build and can only be done if you have a CNC machine to start with.

I actually had the 45x90 already made in 3D model, now I can show it. I also added reinforcement plates for the Z axis sides. Yes, I got the idea from your webpage, JazzCNC :)

Yes, don't underestimate the Z-axis, it's THE most important part of the machine, if the Z-axis is weak or underpowered it doesn't matter how good the rest of the machine. Also, if you plan on doing 3D type work or V-carving which has lots of Z-axis movement then you will need plenty of power with a reasonably heavy spindle like a 2.2Kw.

Roger that.

We fit 55Vac transformers on the machines we build using these Lichuan drives and with a 230V - 55Vac transformer on a UK grid which runs around 240Vac the output usually runs around 60Vac so I would expect you'll be ok because I think your grid will be more like 220/230Vac and the Lichuan drives will handle 70Vac and I know from experience because of a transformer sizing error that they will take 72Vac without damage.

Then I'll go with 55Vac transformer, thanks for the info.