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fan grill with hexagon cut pattern
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| if "show_object" not in locals(): | |
| from cq_server.ui import ui, show_object | |
| from fnmatch import translate | |
| from os import link | |
| import cadquery as cq | |
| from math import cos, sin, tan, radians as rad, floor, ceil | |
| from collections import namedtuple | |
| DimsCube = namedtuple('DimsCube', ['l', 'w', 't']) | |
| DimsCirc = namedtuple('DimsCirc', ['d', 't']) | |
| DimsScrew = namedtuple('DimsScrew',['d','l','h_d','h_l']) | |
| overall_size = 60 | |
| d_hole_spacing = 50 | |
| d_padding = (overall_size-d_hole_spacing)/2 | |
| d_screw = DimsScrew(3.5,30,7,10) | |
| d_box = DimsCube(d_hole_spacing+d_screw.d+2*d_padding,d_hole_spacing+d_screw.d+2*d_padding,2) | |
| d_hex = 2.4 | |
| d_hex_pad = 1.2 | |
| # http://blog.ruslans.com/2011/02/hexagonal-grid-math.html | |
| _hex_s = (3/2) * (d_hex+d_hex_pad)/2 | |
| _hex_h = (d_hex+d_hex_pad)/2 * (3**0.5) | |
| hex_pos = lambda r,c: (c*_hex_s, r*_hex_h if c%2==0 else r*_hex_h+_hex_h/2) | |
| num_mesh_holes = 0.5*d_hole_spacing/d_hex | |
| mesh = ( | |
| cq | |
| .Workplane("top") | |
| .box(d_box.l,d_box.w,d_box.t,centered=(True,True,False)) | |
| .pushPoints([ | |
| (x*d_hole_spacing/2,y*d_hole_spacing/2) | |
| for x,y in [(1,1),(-1,1),(1,-1),(-1,-1)] | |
| ]) | |
| .circle(d_screw.d/2) | |
| .cutThruAll() | |
| .edges('|Y') | |
| .fillet(d_screw.h_d) | |
| ) | |
| hex_grid = ( | |
| cq | |
| .Workplane("top") | |
| .box(100,100,3,centered=(True,True,False)) | |
| .pushPoints([ | |
| hex_pos(r,c) | |
| for r in range(-floor(num_mesh_holes),ceil(num_mesh_holes)) | |
| for c in range(-floor(num_mesh_holes),ceil(num_mesh_holes)) | |
| ]) | |
| .polygon(6,d_hex) | |
| .cutThruAll() | |
| # .cutThruAll() | |
| ) | |
| hex_grid = ( | |
| cq | |
| .Workplane("top") | |
| .box(d_hole_spacing-d_padding,d_hole_spacing-d_padding,d_box.t, centered=(True,True,False)) | |
| .edges('|Y') | |
| .fillet(d_screw.d) | |
| .cut(hex_grid) | |
| ) | |
| mesh = ( | |
| mesh | |
| .cut(hex_grid) | |
| .edges('(>Y) or (<Y)') | |
| .chamfer(0.3) | |
| ) | |
| show_object(mesh) | |
| cq.exporters.export( | |
| mesh, | |
| f"fan_grill_{overall_size}mm.stl" | |
| ) |
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