absolutely free CAD type programs

[KellisRJ]

Thanks for the response. My question was posed not so much for my own shop use but I have a few magneto designs I'd like to share but my shop drawings are really rough-not worth of sharing.

Try LibreDraw in the LibreOffice suite. You can layer drawings, click to lock the layer, and easily put dimensions on lines. The first layer is set up to be the dimensions. If you have played with lines in PowerPoint, you will find it's pretty easy to use. The user interface is old school pre-Office 2007 so that is a plus. It will also open pdf files and if the lines were drawn in an Adobe program you will be able to manipulate them.

 

[awake]

The process that GreenTwin has described - how to decide which plane to sketch on, etc. - is exactly what MangoJelly has been working through in his series Introduction to FreeCAD 1.0. Even though the videos are specific to that software, the procedures he describes would be universal for nearly any 3d CAD program. For example, he goes through a series of steps; one of them is to note if the object to be modeled forms a rectangle when viewed on any given side. If so, it is a candidate for drawing a sketch and extruding it. If not, then you need to think about other options, such as a rotation. Honestly, I have only skimmed this series, as much of it is more beginner than I am (not that I am any sort of expert whatsoever), but seeing GreenTwin's description of the process called this series to mind. I must stress - no affiliation other than someone who finds many of his videos helpful (especially the ones on more advanced topics).

 

[GreenTwin]

I had to grow a lot of new brain synapes in order to learn how to use a 3D program.
One of the more frustrating things I have ever learned.
My brother saw my 3D program on my computer, and noted "That looks really complicated".
I told him "No not really, I basically use a handful of commands over again, such sketch, cut, extrude, rotate, shell. Mostly the same thing over and over again".

I started conceptualizing what I was trying to do by looking at a Play Doh extruder.
You basically sketch out the shape you want, in the position you want, and then like the Play Doh extruder, you extrude that shape, then rinse and repeat.
You can also extrude a cut.

Once you figure out the extrusion thing, it starts to make more sense.
It is not like 2D at all, and you have to forget everything you know about 2D (other than perhaps how to make a 2D sketch).

The die (sketch shape) determines what shape comes out of the extruder.
You can also rotate the die around an axis for spherical shapes.
One tricky thing was figuring out exactly where and how to position the die before you start extruding.
Took me a year to get a good feel for the 3D concept.
I gave up many times, but kept coming back for punishment, because more and more people were doing fantastic stuff with 3D.
The 3D boat was setting sail into the 21st Century, and I wanted to be on that boat.

(not my photo)
.

 

[Gordon]

I also migrated from 2D which I had used for 30 years to 3D and at first nothing made sense. My biggest problem was that when I wanted to place something I had always entered the X & Y dimensions and with 3D basically you place it in the approximate position and then refine the position. Basically 3D drawing is like they say about making a statue. You start out with a block of marble and carve away everything that does not look like a horse. 3D is like starting out with a block of steel and cutting away everything that does not look like an engine part.

 

[Richard Hed]

I also migrated from 2D which I had used for 30 years to 3D and at first nothing made sense. My biggest problem was that when I wanted to place something I had always entered the X & Y dimensions and with 3D basically you place it in the approximate position and then refine the position. Basically 3D drawing is like they say about making a statue. You start out with a block of marble and carve away everything that does not look like a horse. 3D is like starting out with a block of steel and cutting away everything that does not look like an engine part.

Yes, I struggled with Alibre and I already knew AutoCAD 3D. I remember you struggling with Alibre. When yhou kikt the computer, did it kik back?

 

[GreenTwin]

Granted, I am not the sharpest person, and I am well known as a "slow learner", but I really did not think I was ever going to be able to use a 3D modeling program.
I would watch ytube videos, but I could not find any "Here is how to design a model engine using 3D modeling".
They would draw a shape or something, but no real guidance about an overall strategy for model engine design in 3D.

I finally figured it out, but I pulled out a lot of hair in the process.

.

 

[Gordon]

I finally have gotten marginally proficient with Alibre. I had used Visual CADD for years and I still wish that a lot of the features of Visual CADD were available in Alibre. I miss being able to enter coordinates manually and being able to enter a command using a two letter command. I still find my self trying to use the two letter command for things. Once you learn the commands it is much faster than searching for the correct drop down menu etc. To be fair I used the 2D about 15-20 hours per week for 30 years and now I make a 3D drawing maybe once every couple of months.

 

[petertha]

You start out with a block of marble and carve away everything that does not look like a horse. 3D is like starting out with a block of steel and cutting away everything that does not look like an engine part.

I hear 3D CAD comments along these same lines quite often. I think well intentioned; trying to provide context or visualization to an outsider with no other point of reference. But analogy's can also complicate or impede understanding if they don't fully apply. Or you need another analogy to footnote the first analogy. This is such a case. No way would you start with a rectangular block & carve out an engine.

What you are describing is 'subtractive' modelling. Draw a sketch on an existing solid & 'remove' material. A circle becomes a hole, that kind of thing. But it is by no means the only way. Another way is 'additive' modelling. I can draw a circle on a solid, the same circle for arguments sake, extrude it & it becomes a cylindrical solid feature (aka a boss). The circle is just a simple example, it can be any kind of sketch. I can draw a 2D shape & rotate it about an axis and it becomes a solid. I can make a 3D sketch & extrude it along a path; more 'additive' methods. My point is there is no 'one way' in CAD. There is flexibility to use a multitude of different methods to develop the part step by step in whatever makes the most sense.

There are some good video resources out there. Yes, unfortunately more internet grazing when we should be making things. But it wouldn't take many to kind of get an overview feel. Most modelers are similar in their purpose even though the icons & commands are different