Idler tensioner: Number of vertices, edges and facets of the meshes and time to generate them. Motor bracket: Number of vertices, edges and facets of the meshes and time to generate them.įilter holder: Number of vertices, edges and facets of the meshes and time to generate them. Selected parameter values to get different mesh resolutions. (B) FreeCAD can export to both polygonal mesh models and standard parametric models. (A) OpenSCAD can export to polygonal mesh models, but not export to parametric models. (B) Dictionaries can be multidimensional and can have strings as keys.
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Line 6 shows how to obtain the height (0.5) of a DIN125 M2.5 washer from the dictionary. Keys can be a float number, as in line 2. (A) Dictionary DIN125_H defines the height (thickness) of some DIN 125 washers. Sample codes of dictionaries for defining component dimensions in Python. Parametric design and variable scope in OpenSCAD.Ĭode (A) will not work because h has not been defined outside the if statement.
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(B) This code produces the same result as in (A) even that the variable assignments are placed after the sphere function calls that use those variables. (A) Assignment in line 4 has no effect outside the if statement therefore the sphere in line 7 will have a radius of 1. Sample codes to show the variable scope in OpenSCAD. (B) The code shows an invalid assignment since variables cannot change their values. (A) Assignment in line 1 has no effect since variables keep a constant value during their entire lifetime. OpenSCAD sample codes to show the effect of its functional programming paradigm. Code (D) is modeled using a Python script for FreeCAD CadQuery workbench. Codes (B) and (C) are modeled using FreeCAD Python scripts. Sample codes to model a rectangular cuboid.Ĭode (A) is modeled in OpenSCAD. (B) Belt tensioners with different belt heights.īelt tensioners with different base width. Tensioner holder dimensions depending on idler tensioner sizes. Idler tensioners with different leadscrew diameters. Idler tensioners with different wall thickness. Idler tensioners with different stroke lengths. For example, the space for the pulley or the tensioner width are smaller for case A than case B, as the figure shows that sep_m3 < sep_m4 and tens_w_m3 < tens_w_m4. The size of the idler tensioner is smaller when it contains an idler pulley using a M3 bolt (A), than when using a M4 bolt (B). Two filter holders for different filter sizes and linear guides.Įxample of an idler pulley made out of a bearing and some washers.Ĭomparing two idler tensioners made out of different components. Two brackets for different stepper motor sizes. (B) Side view of the extended belt tensioner.ģD printing orientation of the four printable models to avoid supports. (A) Side view of the retracted belt tensioner. The leadscrew tightens or loosens the idler tensioner (orange). The two printable parts are drawn in colors: tensioner holder (blue) and idler tensioner (orange). (B) Exploded view of the filter holder assembly to a linear guide. (A) Drawing showing the filter holder parts.
The bracket and the stepper motor are partially transparent to show the internal parts. Printable parts are highlighted with colors: motor bracket (green), filter holder (yellow), belt tensioner (blue and orange). FOSS CAD tools with scripting capabilities.Īrrangement example of the configurable filter stage.
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