To use MCAD in our gear.scad file we will use the instruction use. One of these is MCAD, distributed with OpenSCAD, that includes useful parts to make mechanical models we will use a part of that library to make a couple of toothed wheels. Translate() cylinder(r=gears_bore_diameter/2,īesides the ability to create your own “parts library”, OpenSCAD allows to include all the libraries found on internet to our project. The box_clear value is used to add a tolerance (clearance) to the joints, and obviously depends on the characteristics of the printer used.Ĭylinder(r=axis_cylinder_r, h=axis_cylinder_h)
The main box sides, long_side.scad and short side.scad are simply designed as a union of cubes from which other smaller cubes will be removed to form the interlocking. Going further, it will happen that you would create modules reusable in multiple projects: these modules can be collected in a file to be included in other projects, creating a real personal or shared on the Internet “library”.
#Openscad star software
In general, it is a best practice to use “includes” to split big software projects into smaller and easier to be managed parts by creating lib files, you make it easier to reuse code lines everywhere, like sharing global variables in our case. Pay attention to the fact that the include statement should not be used within modules or instruction clusters, since a library inclusion in that point could cause a syntax error. This file will be included in all files using the instruction: include (Listing 2)Įquivalent, logically, to copying and pasting the lib/sizes.scad content where the instruction is put This way we can use the variables defined in lib/sizes. Gears_len = gears_circular_pitch * gears_number_of_teeth_big / 180 + gears_d īox_width = gears_width + axis_cylinder_h - box_wall + 1 Gears_h = gears_circular_pitch * gears_number_of_teeth_big / 180 Gears_d = gears_circular_pitch * (gears_number_of_teeth_big + gears_number_of_teeth_small ) / 360
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