On Tue, 18 Dec 2018 at 22:50, Gene Heskett <ghesk...@shentel.net> wrote:
> I've made several passes at learning one pkg or another, but after half > an hour without making any real progress, I'm back to measuring and > defining points and writing gcode by hand. There is a lot to be said for drawing in a CAD package and then letting that calculate the start and end points of the lines and curves. (Or, in the case of a D-sub where the corner radius is likely to be the tool radius, just work out the required tool centre points.) I recorded a quick video of one way to sketch a D-sub (Autodesk Inventor, but would be the same in Fusion 360). Unfortunately the screen recorder doesn't show the on-screen pop-ups where one enters dimensions. https://youtu.be/0hA4EKDA8IY Pick construction geometry Draw a rectangle of a size that matches the D-sub dimensions (noting that it is a mid-point dimension on the angled sides) Draw a vertical line to use to anchor the sketch to the origin point Draw a horizontal line to locate the mounting holes. Switch to part geometry Roughly draw the outline specifically not in the right place to avoid auto-constraints causing trouble. Pin the horizontal lines with a colinear constraint Fillet the corners Dimension the edge angles Constrain the sloping edges to the width dimension centre points with a coincident constraint Then dimension the arc start, end and centre relative to the sketch origin. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1916 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
