Posted by Confused_old_codger on Dec 25, 2017; 7:55am
URL: https://forum.librecad.org/Can-LibreCAD-do-what-I-want-tp5715625.html

Good day all

I am a 75 year old retiree living in a remote rural area who has one very bad experience with CAD but would really like to try it again.  First I need to determine which freeware CAD program is easiest to learn and if it can create the files I need without excessive learning and processing work be me

My hobby is pre WWII aircraft and I have a number of aircraft technical drawings as paper, PDFs and JPGs that I would love to convert to CAD drawings by scanning, converting to vector graphics and then "correcting" in CAD software.  The desired end result would be to produce scaled model parts on a 3D printer,  I have never seen one but I have seen parts made by them and there is a local school student who advertises he will 3D print parts at what appears to be a very reasonable cost if the customer supplies the DWG or SVG file.

I know that there is software that will convert the PDFs and JPGs to SVG format and the few drawings I have converted this morning and then printed to PDF look usable (though some of the dimensions will need retyping and some lines have gaps).

In the preCAD times this would have been done by using a single layer drawing containing all the data, printing to thin paper, gluing the pieces of drawing to wood then cutting out on a scroll saw.  

As far as I can tell in CAD this involves separating the centre-lines, dimension lines, etc, from the scanned drawing.  A process which I would hope to be fairly straightforward, and making any corrections.

My questions are
1 - Can LibreCAD accomplish this?
2 - Can older users advise how steep the learning curve is for us old codgers?
3 - Can a line be highlighted and moved from the drawing layer to another (say dimension layer) or must it be redrawn?
4 - Are there tutorials on ALL the steps involved, if yes, which do you recommend and in what order
5 - Where the original scan is "dirty" with fold lines, speckles and shadows etc would you recommend any particular freeware for "pre-processing". I can easily remove fold lines and some other damage in Irfanview but getting rid of the speckles and variable density grey backgrounds is another matter