It would be done in AlibreCAD in much the same way. I agree with Andy. And to add one other comment. When learning CAD it does take at times a different way of thinking about solving a problem. Adding reference lines and drawing relative to the reference line and then often removing that line is a common operation. But not intuitively obvious.
Very similar to creating an arched bridge over a stream. Until the keystone is in place the rest of the blocks fall. So the technique is to build a curved support structure under the arch so all the blocks are put in place including the keystone. Then the supporting blocks are removed and perhaps used for other parts of the bridge infrastructure. If you never see the support blocks you never know that they were needed to place that keystone. Computer CAD is something like that. So it’s not picked up in 30 minutes and the worst thing to do is to immediately start on a project with the goal of learning CAD along the way. At the beginning you don't know what you don't know so you don't know what to learn. That's what tutorials or lessons are for. They take you through the step by step process. And often even after using the CAD for a while it pays to repeat the tutorial or a new introductory one because you don't always pick up the details the first time through. And as we get older it's even harder to remember some of those pesky handy little details. Nicely done Andy. It was a really good demo. John Dammeyer > -----Original Message----- > From: andy pugh [mailto:bodge...@gmail.com] > Sent: December-19-18 10:46 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Done with that panel code, with one exception > > On Wed, 19 Dec 2018 at 17:44, Roland Jollivet <roland.jolli...@gmail.com> > wrote: > > > I watched that. It did look a long winded. Near the end you seem to be > > repeatedly trying to dimension values that are already defined? > > I was deliberately creating driven dimensions. > Those dimensions were not required to define the shape. What they > would be useful for would be hand-coding G-code, which is what I was > trying to demonstrate for Gene. > He was complaining that the maths was hard, and actually it isn't > trivial. I was showing how the computer can do it for you. > > As for long-winded, possibly. I was trying to keep the sketch well > tied-down in space, and at the same time be easy to modify while > remaining stable. > By changing the two widths and the hole spacing that sketch will > automatically re-size to calculate the arc beginning, end and centre > for any size of D-sub. > > -- > 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 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
