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Your machine table should be at the floor level. This is in my opinion the simplest frame you can build. But i don't think you will get enough precision with this type of frame. For z=1500 you will get significan vibrations.
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Hi,
I want to build a larger CNC for foam milling or other low density material ( wax, milling compound). The precision required is not so strict, 0.5 mm should be fine.
Dimensions are 1500 mm on Z axis, 2000 mm on Y and 1500 on X. Of course, variations are acceptable as long as they do not differ radically.
The parts I want to produce are negatives for large fiberglass parts, milled as blocks, assembled together later and surface finished to an acceptable quality so I can cast a mould onto it. Therefore you understand the precision is not an issue here.
So, if any of you has a clue on how to start this project, and can indicate me a place to download plans, suggest components and can share an advice I will be greatly appreciative and ready to learn.
Many thanks to all of you !
Adrian
Your machine table should be at the floor level. This is in my opinion the simplest frame you can build. But i don't think you will get enough precision with this type of frame. For z=1500 you will get significan vibrations.
CNC Styropor Schneidemaschinen und CNC Fraesmaschinen | cnc-multitool GmbH is the site where i found the machine i posted.
As i can see in the picture there are two servos driving x axis, one servo for y axis and two servos for z axis. The guiding system seems to be round + ball screw.
this is an example of screw guiding
I see, the machine looks simple enough, but I imagine that for carving a shape similat to a bath tube for example, it needs to have a very long milling head, or an additional screw that can lower the milling motor so that the carving head is approximative 1000 mm below the frame that connects the two pillars. Otherwise, the travel of 1000 mm on the z axis is useless...
Good observation! This aspect eluded me.
i think it should be something like this:
Just machine table must be at floor level and a much higher gantry.
Last edited by nokturn; 09-05-2011 at 08:59 AM. Reason: url instead of image
For this project you must use linear guides.
In this case yo will need two servos for driving X axis(moving the gantry), one for Y axis and one for Z axis.
A good place to start is Hi-end magazin, Hobby CNC, kituri si materiale
You will find stepper motors, servo motors, drivers, linear guide rails, inverters and so on.
It won't be enough to make a fully functional machine but it can get you started.
First you need to design the mechanical part of the cnc machine but you must also consider the software you will use to generate G-code and what kind of controlers you want to use.
Some popular controlers are Wincnc and Mach3(cheaper).
And there is necessary to have the milling head able to swing along the X axix because the milling motor does not interfere with the milling surface if we have to mill a vertical wall for example XZ plane. And around the Z axis for the vertical wall in the YZ plane. Huh, this does not seems to be an easy task...
Maybe you projects require 4 axis(c axis) 360 degrees rotation agregate with manual adjusting milling angle or 5 axis( like the Hendrick machine in my earlier post).
I belive you want to build something like this CNCMotion machine:
Last edited by nokturn; 09-05-2011 at 10:56 AM. Reason: completion
5 axis definitely... I wonder how are the german machines milling a near vertical wall, the ones in the first example you gave me... I'll send them an enquiry...
I plan to do the same, but with lower Z-travel.
http://www.cnczone.com/forums/open_s..._cost_cnc.html
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