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Merge branch 'martinbudden-polyholes'

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Chris Palmer 2021-02-11 09:41:27 +00:00
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12
readme.md
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@ -6173,18 +6173,18 @@ leaving a scar on either surface.
### Functions ### Functions
| Function | Description | | Function | Description |
|:--- |:--- | |:--- |:--- |
| `corrected_diameter(d, n = 0)` | Adjusted diameter to make flats lie on the circle | | `corrected_diameter(d, n = undef)` | Adjusted diameter to make flats lie on the circle |
| `corrected_radius(r, n = 0)` | Adjusted radius to make flats lie on the circle | | `corrected_radius(r, n = undef)` | Adjusted radius to make flats lie on the circle |
| `sides(r)` | Optimium number of sides for specified radius | | `sides(r, n = undef)` | Optimium number of sides for specified radius |
### Modules ### Modules
| Module | Description | | Module | Description |
|:--- |:--- | |:--- |:--- |
| `drill(r, h = 100, center = true)` | Make a cylinder for drilling holes suitable for CNC routing, set h = 0 for circle | | `drill(r, h = 100, center = true)` | Make a cylinder for drilling holes suitable for CNC routing, set h = 0 for circle |
| `poly_circle(r, sides = 0)` | Make a circle adjusted to print the correct size | | `poly_circle(r, sides = undef)` | Make a circle adjusted to print the correct size |
| `poly_cylinder(r, h, center = false, sides = 0, chamfer = false, twist = 0)` | Make a cylinder adjusted to print the correct size | | `poly_cylinder(r, h, center = false, sides = undef, chamfer = false, twist = 0)` | Make a cylinder adjusted to print the correct size |
| `poly_drill(r, h = 100, center = true)` | Make a cylinder for drilling holes suitable for CNC routing if cnc_bit_r is non zero, otherwise a poly_cylinder. | | `poly_drill(r, h = 100, center = true)` | Make a cylinder for drilling holes suitable for CNC routing if cnc_bit_r is non zero, otherwise a poly_cylinder. |
| `poly_ring(or, ir, sides = 0)` | Make a 2D ring adjusted to have the correct internal radius | | `poly_ring(or, ir, sides = undef)` | Make a 2D ring adjusted to have the correct internal radius |
| `poly_tube(or, ir, h, center = false)` | Make a tube adjusted to have the correct internal radius | | `poly_tube(or, ir, h, center = false)` | Make a tube adjusted to have the correct internal radius |
| `slot(r, l, h = 100)` | Make a horizontal slot suitable for CNC routing, set h = 0 for 2D version | | `slot(r, l, h = 100)` | Make a horizontal slot suitable for CNC routing, set h = 0 for 2D version |

20
utils/core/polyholes.scad
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@ -33,20 +33,20 @@
//! When `twist` is set the resulting cylinder is extended by `eps` at each end so that the exact length of the hole can be used without //! When `twist` is set the resulting cylinder is extended by `eps` at each end so that the exact length of the hole can be used without
//! leaving a scar on either surface. //! leaving a scar on either surface.
// //
function sides(r) = max(round(4 * r), 3); //! Optimium number of sides for specified radius function sides(r, n = undef) = is_undef(n) ? max(round(4 * r), 3) : n ? max(n, 3) : r2sides(r); //! Optimium number of sides for specified radius
function corrected_radius(r, n = 0) = r / cos(180 / (n ? n : sides(r))); //! Adjusted radius to make flats lie on the circle function corrected_radius(r, n = undef) = r / cos(180 / sides(r, n)); //! Adjusted radius to make flats lie on the circle
function corrected_diameter(d, n = 0) = d / cos(180 / (n ? n : sides(d / 2))); //! Adjusted diameter to make flats lie on the circle function corrected_diameter(d, n = undef) = 2 * corrected_radius(d / 2 , n); //! Adjusted diameter to make flats lie on the circle
module poly_circle(r, sides = 0) { //! Make a circle adjusted to print the correct size module poly_circle(r, sides = undef) { //! Make a circle adjusted to print the correct size
n = sides ? sides : sides(r); n = sides(r, sides);
circle(r = corrected_radius(r,n), $fn = n); circle(r = corrected_radius(r, n), $fn = n);
} }
module poly_cylinder(r, h, center = false, sides = 0, chamfer = false, twist = 0) {//! Make a cylinder adjusted to print the correct size module poly_cylinder(r, h, center = false, sides = undef, chamfer = false, twist = 0) {//! Make a cylinder adjusted to print the correct size
if(twist) { if(twist) {
slices = ceil(h / layer_height); slices = ceil(h / layer_height);
twists = min(twist + 1, slices); twists = min(twist + 1, slices);
sides = sides ? sides : sides(r); sides = sides(r, sides);
rot = 360 / sides / twists * (twists < slices ? (1 + 1 / slices) : 1); rot = 360 / sides / twists * (twists < slices ? (1 + 1 / slices) : 1);
if(center) if(center)
for(side = [0, 1]) for(side = [0, 1])
@ -64,10 +64,10 @@ module poly_cylinder(r, h, center = false, sides = 0, chamfer = false, twist = 0
poly_circle(r, sides); poly_circle(r, sides);
if(h && chamfer) if(h && chamfer)
poly_cylinder(r + layer_height, center ? layer_height * 2 : layer_height, center, sides = sides ? sides : sides(r)); poly_cylinder(r + layer_height, center ? layer_height * 2 : layer_height, center, sides = sides(r, sides));
} }
module poly_ring(or, ir, sides = 0) { //! Make a 2D ring adjusted to have the correct internal radius module poly_ring(or, ir, sides = undef) { //! Make a 2D ring adjusted to have the correct internal radius
cir = corrected_radius(ir, sides); cir = corrected_radius(ir, sides);
filaments = (or - cir) / extrusion_width; filaments = (or - cir) / extrusion_width;
if(filaments > 3 + eps) if(filaments > 3 + eps)