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3-Axis precision mini CNC machine
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Benta:

--- Quote from: xzswq21 on August 21, 2021, 08:02:38 pm ---I need a high accuracy mini CNC machines.

--- End quote ---

OK, just to give you an idea on offerings based on your wishes.

This is a small machine that will accommodate your needs regarding workpiece size and accuracy (Stepcraft D300):
https://www.stepcraft-systems.com/en/cnc-machines/d-series
Quite honestly, it's a toy. It will work for wood and plastics, but will be at its limit with aluminium. Forget brass and stainless steel. Just look at its weight.

This is somewhat better (CNC-STEP S400T):
https://www.cnc-step.de/cnc-fraese-high-z-s-400t-kugelgewindetrieb-400x300mm/
It will take your workpieces, it will machine aluminium and brass, and with care, also steel and certain stainless alloys.

Here's a machine that will do almost everything you want (Wabeco CC-F1200):
https://www.wabeco-remscheid.de/catalog/category/view/s/cc-f1200/id/341/
It will machine everything, including stainless steel. but it has a big limitation: the Y-axis working range is only 150 mm (~6").
Note that it's a cast iron machine (not aluminium), weighing in at around 105 kg. This feature is a Good Thing!

Now you've seen the price ranges for what are not even production machines, but rather hobby or prototyping. Feel free to have a heart attack.
Of course, copies/clones of these types of machines are available from China at perhaps half price.

The reason I especially mention stainless is, that except for a few alloys, it's hell to work with for a milling machine. It's either "gummy" when cutting, or even worse, it work hardens to glass brittleness, thus needing a very rigid machine with high feed rates.

KaneTW:
Forget about CNC-STEP etc. They're not worth your money even as a hobbyist machine. CNC-STEP in particular vastly overpromises their specs.

First of all, your tolerances in the motion system must be tight enough. This means high-accuracy ball screws etc.
Secondly, open-loop steppers won't work here. You need a closed-loop system with a sufficiently exact encoder.
Thirdly, your machine must be very rigid and low on vibration. Cast iron or granite/etc base is required.

You mention stainless steel. Due to its propensity to work harden, you can't work slowly and you need flood coolant. This pretty much pushes you into big, enclosed machine territory.

For example, for stainless, you also need to keep your workpiece within 15C of reference temperature to achieve 50um/200mm accuracy.

You're looking at Haas Mini Mill (lighter use), DMG Mori M1 (heavier use), etc. at least imo. A Tormach 1100MX *might* be able to cut it, but that's closer to hobby territory.
So 5 digits for sure, the question is just whether it's 50k or 20k base.


Benta:
Let's not go over the top. The OP specified 0.05 mm tolerances, which is not that hard to achieve.

But the aluminium based machines are either jokes or for plastic cutting. Cast iron is the thing.

langwadt:

--- Quote from: Benta on August 22, 2021, 12:25:39 am ---Let's not go over the top. The OP specified 0.05 mm tolerances, which is not that hard to achieve.

But the aluminium based machines are either jokes or for plastic cutting. Cast iron is the thing.

--- End quote ---

nonsense, https://youtu.be/_fPTYjScd_w
AccountRemovedPerUsersRequest:
I have a CNC made of extruded aluminum rods and open-loop steppers. Here is an example of a routed PCB. Pads are 16mils and tracks are 12mils. How is this related to anything? Well, just sharing an example.

A
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