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If i want to make something like this





How many axis do i want???

Hello Mik82,

I would think a 4th Axis. That way you could rotate the part and get all the way around it. I am guessing it is how many different inclusions it has. Those are the really recessed areas(Dark Shadow Areas). The deeper they get, the more multiple axis would help you get into those areas.

Have a good one,
Ivan

Can i use a 3 axis machine to work just the front view and then rotate it by hand so i can make the sides??
But i think that it would be very complicated.

Hello Mik82,

In theory that would work. The issue would be to get the piece zeroed out exactly. When you start your next machining cycle from a different axis you would need to start precisely in the perfect spot. Think of having your printing head on your printer off just slightly. Your eye would notice it instantly.

Now, with a 4th axis, you could have the same problem if you have backlash(Slop) in your indexing head. It could be machining around the part, then the backlash enters the picture. Now your machining is just a little off with each pass of the tool.

How do I know? I have had it happen to me.

Have a good one,
Ivan

I'm just getting creative here. I have no idea if this would work.

If I were trying to do this on a 3 axis, I would put in a spot check on each side that will be milled off later. That way I could check alignment before I milled the whole piece. It would not be so much complicated as a headache.

My first post here. Hi all and thanks for "this place", Ivan.

Mik82,

In using a 3-axis, you could mount a couple strips of scrap wood to your table, at 90 degrees to each other, to align the piece to the 0,0 position on the machine. I believe this would ensure "exact" placement when rotated. I should think you would also want/need three separate G-code files, one for each side to be machined, all starting at the 0,0 position. This is just my own thinking as a hobbyist woodworker. I've been inspired by this, and other CNC sites, to build my own machine, but haven't done so yet, So I cannot speak from experience here, yet.

For the price of pieces like that, I can understand why you would want to make them yourself.

Nice idea bikebuilder!

It could work in theory.You see i am a carpender and i would spend at least 2-3 days trying to make that sculpture by hand.On the other hand with a cnc router and the design downloaded from the computer i would spend 1-2 hours i guess!

Pricing?
I am not sure what is the demand for this kind of sculptures in USA but i can't afford to charge so much here in Greece...

ned wrote:
I'm just getting creative here. I have no idea if this would work.

If I were trying to do this on a 3 axis, I would put in a spot check on each side that will be milled off later. That way I could check alignment before I milled the whole piece. It would not be so much complicated as a headache.

Thanks ned!
I think that your idea is worth trying.
Stick to simplicity!!

Ockham's Razor: The simplest solution is the best one. Besides that, I don't know enough to suggest something real complex ;D.