Re: [CAD_CAM_EDM_DRO] Re: 2.5 axis vs. 3 axis

I have followed with enthusiasm, the discussion on the subject of 2.5 axis
vs 3 axis CNC. I have learned a lot from the many posts on the subject.

Amazingly, I have not stopped to ask the question re: my own equipment. I
presently don't need 3 Axis machining ability though I'm sure that it would
be fun to play with once I learn more.

With that Said, I'm curious to know about the three parts of my system and
which are 2.5 axis vs three axis capable:

My Mill is a Sherline
My controller is AhHa running 3.1u or 4.0
My CAD/CAM Software is Dolphin CAD/CAM

If I understand correctly, the ability to run 3 axis is both a function of
the driver equipment being able to generate simultaneous movement on all 3
axis and of my software to generate the 3 axis paths? Correct?

-Eric



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--- In CAD_CAM_EDM_DRO@y..., "Rob" <robv@s...> wrote:
> What's the difference?

Geesh-oh pete! How about a real machine shop answer?

A 2 axis machine is like a Bridgeport type mill and only the table
movement is controlled by the CNC (X and Y). The quill is controlled
manually. Most simple lathes are only 2 axis, X and Z.

A 2 - 1/2 axis machine is when the quill of the mill (or spindle) is
controlled but only for a stationary depth. You can program to move
your tool to a specified depth and it will remain there until you
specify another depth.

A full 3 axis machine is one that can produce a 3D surface the
machine will move all 3 axis (X, Y and Z) all at the same exact time.
The CAM software will produce short little straight line moves that
make your tool follow a contour. Imagine your machine actually
cutting a face out of a block. Your tool motion will contour back and
forth across the face in X and Y and at the same time the quill will
move up and down following the contour of the face.

3D machining is a whole new world to get into. Most full size CNC
machines will do 3D but most low end CAM software will not. The going
price for a GOOD 3D contouring software can set you back $15K to $20K