On 2/7/2020 5:31 PM, Andy Pugh wrote:
On 7 Feb 2020, at 23:45, Greg Bernard <marzetti...@gmail.com> wrote:
That is interesting and useful, but I wonder if probing the important
features and simply tracing a scan or a photograph of the profile in CAD
would be quicker and easier for that particular part.
Possibly, but at least this way it is definitely scaled in mm, and furthermore
the same mm as my mill.
I either do a direct scan of the part, or trace on paper then scan, and
bring the bitmap into Inkscape. From there I convert it to svg, and
let Inkscape find the edges, save the profile as a dxf, and bring that
into CAD. It's usually easy to get < .5mm accuracy. With extra care and
some tweaking in Inscape it's not impossible to hit .25 - .30 mm edge to
edge accuracy, especially from a direct scan. If the part is scan-able,
it also works for locating holes and pockets. Large parts can be
scanned in sections and stitched together in the tool. Unfortunately ,
even .25 isn't good enough for some applications.
When I saw the video, I couldn't help but wonder if there isn't a faster
way to probe yet still maintain accuracy. I thought about a hybrid
approach, where you take that profile from Inkscape and feed it to a
routine that probes the actual part, but now from within a 1-2mm
envelope of the provided profile. If the profile has long straight
edges, the routine need only probe the beginning and the end of that
line. "Smart probing"! Just a thought.
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