Re: [CAD_CAM_EDM_DRO] Interplotation?

John,

An Interpolated move is a move of other then 90 or 0 degrees. A simple
45 degree angle, say from 0,0 to X = 1, Y = 1 is not hard to see or do.
Now make it 60 deg. Now we go to X = 1, Y = .866, not as simple! So
we simultaneously move one axis 1", and the other .866", and we need to
get to the endpoint (1, .866) at exactly the same time for both axis.
Next, take an arc. Not only do we move the axis at a different rate,
but the rate varies as we progress around the arc. Draw an entire
circle? We find that in addition to changing speeds as we go 'round,
but we must change directions every 90 degrees! Think of it as
rectangular to polar conversion, for ALL the points on the arc! FUN

Hope this gives you a glimpse of what's going on "under the hood".

Alan KM6VV
P.S. Interpolate means to "supply a point" between two other known
points. So I guess we're supplying lottsa "points" between two known
points. Sometimes in a straight line, other times along an arc.
Probably other ways too, like complex curves. These are probably done
by the CAD/CAM program, and sent to the controller as a set of very
small lines.


e.heritage@... wrote:

>
> > Perhaps a very simple question to many of you but I'm still a simpleton
> when
> > it comes to milling. I know that monitors interplotate the lines on the
> > screen with a 2" or so gap between them, displaying two at once split
> apart.
> > And you see the lines on TV with the refresh rates being so different. But
> > what exactly does it mean in milling? That the software / mill can put all
> > the axes' together into a set of 3D dimensions? Or is it something to do
> > with how it controls each axis relative to the others?
> >
> > Thanks,
> > John