Re: [CAD_CAM_EDM_DRO] 2D v 2 1/2D

My comment does not apply to the differences between 2 , 2-1/2 , or 3d in
regards CAD programs.
However, if your question is targeted In line with the thought af a CNC
machine, here is my "Simple" watered down example.

2d may be best described as a machine like a CNC Plasma cutter that does not
vary it's Z axis depth automatically by motor or selenoid control. It simply
has "motion" in X and Y directions with the torch riding at a comfortable
height above the material and then turning on and off to cut "completely"
thru the material.

2-1/2d however would incorporate a moving Z axis either by Motor, Selenoid or
air cylinder. This (Z) axis in the typical Router or Vertical Milling machine
is where your "bit" ot "tool" comes down from a higher position, and
"plunges" into the material to a FIXED depth in Z. A 2-1/2d toolpath would
indicate *where* to plunge into the material and *how* deep. It would NOT
however, allow the Tool to move "up and down" in the material WHILE the X and
Y are in motion.

You might be able to picture the stairs of a staircase...... It is "stepped"
with 2d, not "ramped".

3d, which you did not ask about, is simply the ability to simultaneously run
3 axis of motion. Now you can "cut a Ramp" as in the Staircase example. The
above concepts do carry much more detail to them than I have indicated and
there are various "hybrid" techniques and sometimes sales pitches to "blur"
the possiblilities of any given claim.

But, hey, this gets you close !

Chris L

nweller_30809 wrote:

> Can anyone please explain the differences between 2D and 2 1/2D?
> When would you want 2 1/2D capabilities? A simple mind needs a
> simple answer. Thanks for the help.
>
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