////////////////////////////////////////////////////////////////////// // LibFile: hingesnaps.scad // Modules for creating snap-locking foldable hined parts. Includes the mask to create the hinge and // modules to create the snap-locks. // Includes: // include // include // FileGroup: Parts // FileSummary: Foldable, snap-locking parts. ////////////////////////////////////////////////////////////////////// // Section: Hinges and Snaps // Module: apply_folding_hinges_and_snaps() // Usage: // apply_folding_hinges_and_snaps(thick, [foldangle=], [hinges=], [snaps=], [sockets=], [snaplen=], [snapdiam=], [hingegap=], [layerheight=], [$slop=]) CHILDREN; // Description: // Adds snaplocks and create hinges in children at the given positions. // Arguments: // thick = Thickness in mm of the material to make the hinge in. // foldangle = The interior angle in degrees of the joint to be created with the hinge. Default: 90 // hinges = List of [LENGTH, POSITION, SPIN] for each hinge to difference from the children. // snaps = List of [POSITION, SPIN] for each central snaplock to add to the children. // sockets = List of [POSITION, SPIN] for each outer snaplock sockets to add to the children. // snaplen = Length of locking snaps. // snapdiam = Diameter/width of locking snaps. // hingegap = Size in mm of the gap at the bottom of the hinge, to make room for folding. // layerheight = The expected printing layer height in mm. // --- // $slop = increase hinge gap by twice this amount // Example(Med): // size=100; // apply_folding_hinges_and_snaps( // thick=3, foldangle=54.74, // hinges=[ // for (a=[0,120,240], b=[-size/2,size/4]) each [ // [200, polar_to_xy(b,a), a+90] // ] // ], // snaps=[ // for (a=[0,120,240]) each [ // [rot(a,p=[ size/4, 0 ]), a+90], // [rot(a,p=[-size/2,-size/2.33]), a-90] // ] // ], // sockets=[ // for (a=[0,120,240]) each [ // [rot(a,p=[ size/4, 0 ]), a+90], // [rot(a,p=[-size/2, size/2.33]), a+90] // ] // ] // ) { // $fn=3; // difference() { // cylinder(r=size-1, h=3); // down(0.01) cylinder(r=size/4.5, h=3.1, spin=180); // down(0.01) for (a=[0:120:359.9]) zrot(a) right(size/2) cylinder(r=size/4.5, h=3.1); // } // } module apply_folding_hinges_and_snaps(thick, foldangle=90, hinges=[], snaps=[], sockets=[], snaplen=5, snapdiam=5, hingegap=undef, layerheight=0.2) { hingegap = default(hingegap, layerheight)+2*get_slop(); difference() { children(); for (hinge = hinges) { translate(hinge[1]) { folding_hinge_mask( l=hinge[0], thick=thick, layerheight=layerheight, foldangle=foldangle, hingegap=hingegap, spin=hinge[2] ); } } } for (snap = snaps) { translate(snap[0]) { snap_lock( thick=thick, snaplen=snaplen, snapdiam=snapdiam, layerheight=layerheight, foldangle=foldangle, hingegap=hingegap, spin=snap[1] ); } } for (socket = sockets) { translate(socket[0]) { snap_socket( thick=thick, snaplen=snaplen, snapdiam=snapdiam, layerheight=layerheight, foldangle=foldangle, hingegap=hingegap, spin=socket[1] ); } } } // Module: folding_hinge_mask() // Usage: // folding_hinge_mask(l, thick, [layerheight=], [foldangle=], [hingegap=], [$slop=], [anchor=], [spin=], [orient=]) [ATTACHMENTS]; // Description: // Creates a mask to be differenced away from a plate to create a foldable hinge. // Center the mask at the bottom of the plate you want to make a hinge in. // The mask will leave hinge material two `layerheight`s thick on the bottom of the hinge. // Arguments: // l = Length of the hinge in mm. // thick = Thickness in mm of the material to make the hinge in. // --- // layerheight = The expected printing layer height in mm. // foldangle = The interior angle in degrees of the joint to be created with the hinge. Default: 90 // hingegap = Size in mm of the gap at the bottom of the hinge, to make room for folding. // $slop = Increase size of hinge gap by double this amount // anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor). Default: `CENTER` // spin = Rotate this many degrees around the Z axis. See [spin](attachments.scad#subsection-spin). Default: `0` // orient = Vector to rotate top towards. See [orient](attachments.scad#subsection-orient). Default: `UP` // Example: // folding_hinge_mask(l=100, thick=3, foldangle=60); module folding_hinge_mask(l, thick, layerheight=0.2, foldangle=90, hingegap=undef, anchor=CENTER, spin=0, orient=UP) { hingegap = default(hingegap, layerheight)+2*get_slop(); size = [l, hingegap, 2*thick]; size2 = [l, hingegap+2*thick*tan(foldangle/2)]; attachable(anchor,spin,orient, size=size, size2=size2) { up(layerheight*2) prismoid([l,hingegap], [l, hingegap+2*thick/tan(foldangle/2)], h=thick, anchor=BOT); children(); } } // Module: snap_lock() // Usage: // snap_lock(thick, [snaplen=], [snapdiam=], [layerheight=], [foldangle=], [hingegap=], [$slop=], [anchor=], [spin=], [orient=]) [ATTACHMENTS]; // Description: // Creates the central snaplock part. // Arguments: // thick = Thickness in mm of the material to make the hinge in. // --- // snaplen = Length of locking snaps. // snapdiam = Diameter/width of locking snaps. // layerheight = The expected printing layer height in mm. // foldangle = The interior angle in degrees of the joint to be created with the hinge. Default: 90 // hingegap = Size in mm of the gap at the bottom of the hinge, to make room for folding. // $slop = increase size of hinge gap by double this amount // anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor). Default: `CENTER` // spin = Rotate this many degrees around the Z axis. See [spin](attachments.scad#subsection-spin). Default: `0` // orient = Vector to rotate top towards. See [orient](attachments.scad#subsection-orient). Default: `UP` // Example: // snap_lock(thick=3, foldangle=60); module snap_lock(thick, snaplen=5, snapdiam=5, layerheight=0.2, foldangle=90, hingegap=undef, anchor=CENTER, spin=0, orient=UP) { hingegap = default(hingegap, layerheight)+2*get_slop(); snap_x = (snapdiam/2) / tan(foldangle/2) + (thick-2*layerheight)/tan(foldangle/2) + hingegap/2; size = [snaplen, snapdiam, 2*thick]; attachable(anchor,spin,orient, size=size) { back(snap_x) { cube([snaplen, snapdiam, snapdiam/2+thick], anchor=BOT) { attach(TOP) xcyl(l=snaplen, d=snapdiam, $fn=16); attach(TOP) xcopies(snaplen-snapdiam/4/3) xscale(0.333) sphere(d=snapdiam*0.8, $fn=12); } } children(); } } // Module: snap_socket() // Usage: // snap_socket(thick, [snaplen=], [snapdiam=], [layerheight=], [foldangle=], [hingegap=], [$slop=], [anchor=], [spin=], [orient=]) [ATTACHMENTS]; // Description: // Creates the outside snaplock socketed part. // Arguments: // thick = Thickness in mm of the material to make the hinge in. // --- // snaplen = Length of locking snaps. // snapdiam = Diameter/width of locking snaps. // layerheight = The expected printing layer height in mm. // foldangle = The interior angle in degrees of the joint to be created with the hinge. Default: 90 // hingegap = Size in mm of the gap at the bottom of the hinge, to make room for folding. // $slop = Increase size of hinge gap by double this amount // anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor). Default: `CENTER` // spin = Rotate this many degrees around the Z axis. See [spin](attachments.scad#subsection-spin). Default: `0` // orient = Vector to rotate top towards. See [orient](attachments.scad#subsection-orient). Default: `UP` // Example: // snap_socket(thick=3, foldangle=60); module snap_socket(thick, snaplen=5, snapdiam=5, layerheight=0.2, foldangle=90, hingegap=undef, anchor=CENTER, spin=0, orient=UP) { hingegap = default(hingegap, layerheight)+2*get_slop(); snap_x = (snapdiam/2) / tan(foldangle/2) + (thick-2*layerheight)/tan(foldangle/2) + hingegap/2; size = [snaplen, snapdiam, 2*thick]; attachable(anchor,spin,orient, size=size) { fwd(snap_x) { zrot_copies([0,180], r=snaplen+get_slop()) { diff("divot") cube([snaplen, snapdiam, snapdiam/2+thick], anchor=BOT) { attach(TOP) xcyl(l=snaplen, d=snapdiam, $fn=16); tag("divot") attach(TOP) left((snaplen+snapdiam/4/3)/2) xscale(0.333) sphere(d=snapdiam*0.8, $fn=12); } } } children(); } } // vim: expandtab tabstop=4 shiftwidth=4 softtabstop=4 nowrap