Added screw_polysink().
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@ -2933,6 +2933,7 @@ Machine screws and wood screws with various head styles.
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| ```screw_head_depth(type, d = 0)``` | How far a counter sink head will go into a straight hole diameter d |
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| ```screw_longer_than(x)``` | Returns shortest screw length longer or equal to x |
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| ```screw_nut_radius(type)``` | Radius of matching nut |
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| ```screw_polysink_r(type, z)``` | Countersink hole profile corrected for rounded staircase extrusions. |
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| ```screw_shorter_than(x)``` | Returns longest screw length shorter than or equal to x |
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### Modules
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@ -2941,6 +2942,7 @@ Machine screws and wood screws with various head styles.
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| ```screw(type, length, hob_point = 0, nylon = false)``` | Draw specified screw, optionally hobbed or nylon |
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| ```screw_and_washer(type, length, star = false, penny = false)``` | Screw with a washer which can be standard or penny and an optional star washer on top |
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| ```screw_countersink(type, drilled = true)``` | Countersink shape |
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| ```screw_polysink(type)``` | A countersink hole made from stacked polyholes for printed parts |
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![screws](tests/png/screws.png)
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@ -258,7 +258,7 @@ module screw_countersink(type, drilled = true) { //! Countersink shape
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if(head_type == hs_cs || head_type == hs_cs_cap)
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translate_z(-head_height)
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if(drilled)
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cylinder(h = head_height, r1 = 0, r2 = head_rad + head_t);
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cylinder(h = head_height + eps, r1 = 0, r2 = head_rad + head_t);
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else
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intersection() {
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cylinder(h = head_height + eps, r1 = 0, r2 = head_rad + head_t);
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@ -267,6 +267,24 @@ module screw_countersink(type, drilled = true) { //! Countersink shape
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}
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}
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function screw_polysink_r(type, z) = //! Countersink hole profile corrected for rounded staircase extrusions.
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let(rad = screw_radius(type),
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head_t = rad / 5,
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head_rad = screw_head_radius(type)
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)
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limit(head_rad + head_t - z + (sqrt(2) - 1) * layer_height / 2, screw_clearance_radius(type), head_rad);
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module screw_polysink(type) { //! A countersink hole made from stacked polyholes for printed parts
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head_depth = screw_head_depth(type);
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assert(head_depth, "Not a countersunk screw");
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layers = ceil(head_depth / layer_height);
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for(i = [0 : layers - 1], side = [-1, 1])
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translate_z(side * (i + 0.5) * layer_height)
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poly_cylinder(r = screw_polysink_r(type, i * layer_height + layer_height / 2), h = layer_height + 2 * eps, center = true);
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poly_cylinder(r = screw_clearance_radius(type), h = 100, center = true);
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}
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module screw_and_washer(type, length, star = false, penny = false) { //! Screw with a washer which can be standard or penny and an optional star washer on top
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washer = screw_washer(type);
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head_type = screw_head_type(type);
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