On Tue, Jan 4, 2011 at 1:49 PM, andy pugh <[email protected]> wrote:
> On 4 January 2011 18:34, EBo <[email protected]> wrote:
>
> > I think that depends on the algorithm you use to do the sweeps. If you
> > take a 3D model of the tool, and then sweep the tool path between the
> > tangent of the tool at its start and stop location, you would end up
> > with something that works for any circularly swept tools (ie ones that
> > spin).
>
> I was assuming (from a position of ignorance) that there was something
> built in to OpenCascade that dod sweeps. My experience is purely in 3D
> CAD, and in those packages you can only sweep a 2D sketch along a 3D
> path.
>
> OCC won't sweep using a solid. If it did, this would be much easier.
If I can get the silhouette code to work, it should produce a correct sweep
shape for all motion except arcs (and helices) in XZ and YZ plane. In those
cases, the angle of attack wrt Z changes during the motion. The silhouette
is computed using that angle, so it wouldn't be constant over the motion.
I am having some difficulty visualising if a ball-end cutter is easier
> or harder.
This stuff certainly is difficult to visualize or put into words! I'm pretty
sure that a ballnose tool will always create a shape that involves a circle
or circular arc - never an ellipse. So it's easier.
I need to find a tool that allows sketching of geometric shapes in 3d, to
use for visualizing this stuff. 2d just doesn't cut it!
Mark
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