Ecocast equivalent outside UK

[JAZZCNC]

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.!

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.

[NordicCnc]

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.!

Good point. I think 1610 with a 2:1 ratio would be better. That would give me 15000mm/min feedrate and keep the RPM of the ballscrew at 1500. 2010 is probably overkill.

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.!

The machine will have to be made with moving gantry because I require a work area of minimun 1000x800mm for woodworking. The steel machining I am talking about would be machining parts for a new machine in steel in the far future, that would be designed for cutting steel only. This one would then be with fixed Z-axis. Also for the video, here is some german guy running 1605 with those same servomotor, cutting aluminium: https://m.youtube.com/watch?v=xyVr35pgx7s
[/QUOTE]

Given the above then for a Wood/Aluminium machine then yes easily.! . . . Steel, forget Aluminium profile of any size.

I will consider 80x160 since the steel machining would be limited to a minimum (see my comment above). Thanks for your detailed answer!



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[JAZZCNC]

Good point. I think 1610 with a 2:1 ratio would be better. That would give me 15000mm/min feedrate and keep the RPM of the ballscrew at 1500. 2010 is probably overkill.

Yes 2010 would be over kill and would actually lower performance or should say stress the motors more because your having to deal with the extra inertia of larger screw and ballnut.

The machine will have to be made with moving gantry because I require a work area of minimun 1000x800mm for woodworking. The steel machining I am talking about would be machining parts for a new machine in steel in the far future, that would be designed for cutting steel only. This one would then be with fixed Z-axis. Also for the video, here is some german guy running 1605 with those same servomotor, cutting aluminium:

Cutting aluminium isn't a problem with 1605 or 180W servos, esp using adaptive tool paths like they are using as the feed rates are much lower and forces are not too high. However Steel is a different mattter and the forces are much higher.
My comment about the motor power being on the low side and the speed is mainly aimed at higher feed rates when cutting soft materials which require high feed rates, also at rapid speeds when bringing a heavy gantry to a stop or fast directional changes. This is where low power motors struggle, with steppers you'd lose steps but with a servo you'll get high following errors and potential fault trips.

I will consider 80x160 since the steel machining would be limited to a minimum (see my comment above). Thanks for your detailed answer!

Experience as shown me that building a moving Gantry machine that can cut everything including steels and cut them correctly without destroying itself is very difficult to do and profile section isn't strong enough for a machine like this. You need much stronger materials like steel or Epoxy granite and ideally a fixed gantry.
In your case it will serve your needs for very occasional steel work but don't expect to take heavy cuts or have great finish.