- Assignment 02
Know how to model with CADs is essential for the coming weeks, in this I tried some 2D and 3D software.
Solidworks is the most powerful (and expensive) 3D CAD, to test it I designed a parametric box conceived for
laser cutter. It is composed of three pieces repeated 2 times each: Bottom, Front and
The shapes are simple, but I worked a lot on parameterization. I make
dimensions.txt file to
store the 5 parameters:
"thickness"= 3mm'panel thickness "tooth" = 2'tooth length ratio "width" = 100mm'internal width "depth" = 80mm'internal depth "height"= 60mm'internal height
Bottom part is composed by a rectangle with the sides as long as width and depth variables.
After I added the tooth, the length is calculated so that it is as close as possible to `"thickness" *
"tooth"`. Spaces and tooth have equal length.
The complete formula (compatible with any spreadsheet) is:
` "number_of_tooth" = round( "width" / (2 * "thickness" * "tooth") + 1/2) `
` "length_of_tooth" = "width" / (2 * "number_of_tooth" -1) `
At the end I added the corners.
To make Front part I copied Bottom part, removed the corners, replaced depth with height
and used Width sketch to cut a rectangle previously extruded (Ex_Width in figure).
Suspending Mi_Width function I can remove the top tooth to make boxes without cover.
This time I copied Front part, replaced width with depth and repeated previous process with height.
To see if I made everything correctly I assembled the box.download Box 1,30 MB (.zip)
With Fusion 360 I have not drawn anything worthy of note, but I tested an awesome plugin to generate a Kerf (laser cut width) compensated DXF file.
Onshape is an online 3D CAD with same geometric modeling kernel (Parasolid) of Solidworks, indeed it is very similar to it. Free subscription only allows public data, but don't have other restriction. It is more intuitive than the other two and the main functions are more accessible.
To test it I design a stamp.
Rhinoceros is useful to view DXF file generated with other programs and is also convenient for manual nesting. It is also useful to make the kerf with Offset command.download nesting 250 kB (.dxf)
Inkscape is an Open Source vector graphics editor, with capabilities similar to Illustrator and CorelDraw.
I have tested it to trace bitmaps. I imported a .jpg by drag-n-drop and I opened the Trace Bitmap window available in Path and I increased the Threshold up to 0,6 to view the image correctly.
After clicking on OK I closed the window. To see difference between bitmap and vector I changed view by means of View -> Display mode -> Outline
GIMP is a free program for such photo retouching, image composition and image authoring.
I used it to crop all images in my site by means of Crop tool command.
I also designed a final project sketch with Solidworks.download Assembly 104 kB (.stl)