Fixed orientation of inverted pulley.

Added stl and assembly calls. Same render handling as pulleys. Updated pics and readme.
2024-11-23 07:13:51 -05:00 · 2021-01-10 12:11:03 +00:00 · 2021-01-10 12:11:03 +00:00 · c3fc352288
commit c3fc352288
parent a8b634de39
4 changed files with 160 additions and 66 deletions
--- a/printed/printed_pulleys.scad
+++ b/printed/printed_pulleys.scad
@ -1,5 +1,5 @@
 //
-// NopSCADlib Copyright Chris Palmer 2018
+// NopSCADlib Copyright Chris Palmer 2020
 // nop.head@gmail.com
 // hydraraptor.blogspot.com
 //
@ -16,11 +16,9 @@
 // You should have received a copy of the GNU General Public License along with NopSCADlib.
 // If not, see <https://www.gnu.org/licenses/>.
 //
-//
-// Printed pulleys are a remix of droftarts's (see <https://www.thingiverse.com/droftarts/designs>) Parametric Pulleys
-// on Thingiverse (see <https://www.thingiverse.com/thing:16627>) and are licensed under the
-// Creative Commons - Attribution - Share Alike license (see <https://creativecommons.org/licenses/by-sa/3.0/>)
-//
+//! Printed pulleys are a remix of droftarts's (see <https://www.thingiverse.com/droftarts/designs>) Parametric Pulleys
+//! on Thingiverse (see <https://www.thingiverse.com/thing:16627>) and are licensed under the
+//! Creative Commons - Attribution - Share Alike license (see <https://creativecommons.org/licenses/by-sa/3.0/>)
 //

 include <NopSCADlib/core.scad>
@ -28,6 +26,8 @@ include <NopSCADlib/vitamins/pulleys.scad>

 printed_pulley_GT2_profile = [[0.747183,-0.5],[0.747183,0],[0.647876,0.037218],[0.598311,0.130528],[0.578556,0.238423],[0.547158,0.343077],[0.504649,0.443762],[0.451556,0.53975],[0.358229,0.636924],[0.2484,0.707276],[0.127259,0.750044],[0,0.76447],[-0.127259,0.750044],[-0.2484,0.707276],[-0.358229,0.636924],[-0.451556,0.53975],[-0.504797,0.443762],[-0.547291,0.343077],[-0.578605,0.238423],[-0.598311,0.130528],[-0.648009,0.037218],[-0.747183,0],[-0.747183,-0.5]];

+function printed_pulley_inverted(type) = pulley_hub_dia(type) < pulley_flange_dia(type); //! Need to print upside down to prevent overhang
+
 function printed_pulley_od(tooth_count, tooth_pitch, pitch_line_offset)
    = tooth_count * tooth_pitch / PI - 2 * pitch_line_offset;

@ -93,49 +93,58 @@ module printed_pulley(type) { //! Draw a printable pulley
    or = pulley_od(type) / 2;
    screw_z = pulley_screw_z(type);

+    stl(str("printed_pulley_", type[0]));
+
    module core() {
        translate_z(pulley_hub_length(type) + ft)
            linear_extrude(w + 1) let($fa  = 1, $fs = 0.1)
                if ("GT2" == str(pulley_type(type)[0], pulley_type(type)[1], pulley_type(type)[2]))
                    difference() {
                        printed_pulley_GT2_teeth(type);
-                        circle(r = pulley_bore(type) / 2);
+                        circle(d = pulley_bore(type));
                    }
                else
                    difference() {
                        circle(or);
                        printed_pulley_teeth(type);
-                        circle(r = pulley_bore(type) / 2);
+                        circle(d = pulley_bore(type));
                    }
    }

    module screw_holes() {
-        if (pulley_screws(type))
+        if(pulley_screws(type))
            translate_z(screw_z)
                for(i = [0 : pulley_screws(type) - 1])
                    rotate([-90, 180, i * -90])
-                        teardrop(r = screw_pilot_hole(pulley_screw(type)), h = pulley_flange_dia(type)/2 + 1, center=false);
+                        teardrop(r = screw_pilot_hole(pulley_screw(type)), h = pulley_flange_dia(type) / 2 + 1, center = false);
    }

-    // hub
-    if (hl)
-        translate_z(pulley_hub_dia(type) >= pulley_flange_dia(type) ? 0 : hl + w + 2 * ft)
-            render_if(screw_z && screw_z < hl)
-                difference() {
+    module hub()
        linear_extrude(hl)
            difference() {
-                            circle(r = pulley_hub_dia(type) / 2);
-                            circle(r = pulley_bore(type) / 2);
+                circle(d= pulley_hub_dia(type));
+                circle(d = pulley_bore(type));
            }
-                    if (screw_z < hl)
+
+    translate_z(printed_pulley_inverted(type) ? - hl : 0) {
+        // hub
+        if(hl)
+            translate_z(printed_pulley_inverted(type) ? hl + w + 2 * ft : 0)
+                if(screw_z && screw_z < hl)
+                    render() difference() {
+                        hub();
+
                        screw_holes();
                    }
+                else
+                    hub();
+
        // bottom flange
        translate_z(hl)
            linear_extrude(ft)
                difference() {
                    circle(d = pulley_flange_dia(type));
-                circle(r = pulley_bore(type) / 2);
+                    circle(d = pulley_bore(type));
                }

        // top flange
@ -144,7 +153,7 @@ module printed_pulley(type) { //! Draw a printable pulley
            linear_extrude(ft)
                difference() {
                    circle(r = or);
-                circle(r = pulley_bore(type) / 2);
+                    circle(d = pulley_bore(type));
                }
            // outer part at 45 degrees for printing
            rotate_extrude()
@ -153,18 +162,28 @@ module printed_pulley(type) { //! Draw a printable pulley
                        right_triangle(ft, ft);
        }

+        if(screw_z && screw_z > hl)
+            render()
                difference() { // T5 pulleys have screws through the teeth
-        render_if(screw_z && screw_z > hl)
                    core();
-        if (pulley_screw_z(type) > hl)
-            translate_z(pulley_hub_dia(type) >= pulley_flange_dia(type) ? 0 : hl)
+
+                    translate_z(printed_pulley_inverted(type) ? hl : 0)
                        screw_holes();
            }
+            else
+                core();
+    }
 }

-module printed_pulley_assembly(type, colour) { //! Draw a printed pulley with its grub screws in place
+module printed_pulley_assembly(type, colour = pp1_colour) //! Draw a printed pulley with its grub screws in place
+assembly(str("printed_pulley_", type[0])) {
    translate_z(pulley_offset(type)) {
-        color(colour)
+        stl_colour(colour)
+            if(printed_pulley_inverted(type))
+                translate_z(pulley_height(type))
+                    hflip()
+                        printed_pulley(type);
+            else
                printed_pulley(type);

        if (pulley_screws(type))
--- a/readme.md
+++ b/readme.md
@ -37,12 +37,12 @@ See [usage](docs/usage.md) for requirements, installation instructions and a usa
 <tr><td> <a href = "#Extrusions">Extrusions</a> </td><td> <a href = "#Opengrab">Opengrab</a> </td><td> <a href = "#Stepper_motors">Stepper_motors</a> </td><td> <a href = "#PSU_shroud">PSU_shroud</a> </td><td> <a href = "#Rounded_right_triangle">Rounded_right_triangle</a> </td><td></td></tr>
 <tr><td> <a href = "#Fans">Fans</a> </td><td> <a href = "#PCB">PCB</a> </td><td> <a href = "#Swiss_clips">Swiss_clips</a> </td><td> <a href = "#Press_fit">Press_fit</a> </td><td> <a href = "#Sector">Sector</a> </td><td></td></tr>
 <tr><td> <a href = "#Fuseholder">Fuseholder</a> </td><td> <a href = "#PCBs">PCBs</a> </td><td> <a href = "#Toggles">Toggles</a> </td><td> <a href = "#Printed_box">Printed_box</a> </td><td> <a href = "#Sweep">Sweep</a> </td><td></td></tr>
-<tr><td> <a href = "#Geared_steppers">Geared_steppers</a> </td><td> <a href = "#PSUs">PSUs</a> </td><td> <a href = "#Transformers">Transformers</a> </td><td> <a href = "#Ribbon_clamp">Ribbon_clamp</a> </td><td> <a href = "#Thread">Thread</a> </td><td></td></tr>
-<tr><td> <a href = "#Green_terminals">Green_terminals</a> </td><td> <a href = "#Panel_meters">Panel_meters</a> </td><td> <a href = "#Tubings">Tubings</a> </td><td> <a href = "#SSR_shroud">SSR_shroud</a> </td><td> <a href = "#Tube">Tube</a> </td><td></td></tr>
-<tr><td> <a href = "#Hot_ends">Hot_ends</a> </td><td> <a href = "#Pillars">Pillars</a> </td><td> <a href = "#Variacs">Variacs</a> </td><td> <a href = "#Screw_knob">Screw_knob</a> </td><td></td><td></td></tr>
-<tr><td> <a href = "#Hygrometer">Hygrometer</a> </td><td> <a href = "#Pin_headers">Pin_headers</a> </td><td> <a href = "#Veroboard">Veroboard</a> </td><td> <a href = "#Socket_box">Socket_box</a> </td><td></td><td></td></tr>
-<tr><td> <a href = "#IECs">IECs</a> </td><td> <a href = "#Pulleys">Pulleys</a> </td><td> <a href = "#Washers">Washers</a> </td><td> <a href = "#Strap_handle">Strap_handle</a> </td><td></td><td></td></tr>
-<tr><td> <a href = "#Inserts">Inserts</a> </td><td></td><td> <a href = "#Wire">Wire</a> </td><td></td><td></td><td></td></tr>
+<tr><td> <a href = "#Geared_steppers">Geared_steppers</a> </td><td> <a href = "#PSUs">PSUs</a> </td><td> <a href = "#Transformers">Transformers</a> </td><td> <a href = "#Printed_pulleys">Printed_pulleys</a> </td><td> <a href = "#Thread">Thread</a> </td><td></td></tr>
+<tr><td> <a href = "#Green_terminals">Green_terminals</a> </td><td> <a href = "#Panel_meters">Panel_meters</a> </td><td> <a href = "#Tubings">Tubings</a> </td><td> <a href = "#Ribbon_clamp">Ribbon_clamp</a> </td><td> <a href = "#Tube">Tube</a> </td><td></td></tr>
+<tr><td> <a href = "#Hot_ends">Hot_ends</a> </td><td> <a href = "#Pillars">Pillars</a> </td><td> <a href = "#Variacs">Variacs</a> </td><td> <a href = "#SSR_shroud">SSR_shroud</a> </td><td></td><td></td></tr>
+<tr><td> <a href = "#Hygrometer">Hygrometer</a> </td><td> <a href = "#Pin_headers">Pin_headers</a> </td><td> <a href = "#Veroboard">Veroboard</a> </td><td> <a href = "#Screw_knob">Screw_knob</a> </td><td></td><td></td></tr>
+<tr><td> <a href = "#IECs">IECs</a> </td><td> <a href = "#Pulleys">Pulleys</a> </td><td> <a href = "#Washers">Washers</a> </td><td> <a href = "#Socket_box">Socket_box</a> </td><td></td><td></td></tr>
+<tr><td> <a href = "#Inserts">Inserts</a> </td><td></td><td> <a href = "#Wire">Wire</a> </td><td> <a href = "#Strap_handle">Strap_handle</a> </td><td></td><td></td></tr>
 <tr><td></td><td></td><td> <a href = "#Zipties">Zipties</a> </td><td></td><td></td><td></td></tr>
 </table>

@ -5041,6 +5041,73 @@ It can also have printed feet on the base with the screws doubling up to hold th
 |   1 | box2_assembly |


+<a href="#top">Top</a>
+
+---
+<a name="Printed_pulleys"></a>
+## Printed_pulleys
+Printed pulleys are a remix of droftarts's (see <https://www.thingiverse.com/droftarts/designs>) Parametric Pulleys
+on Thingiverse (see <https://www.thingiverse.com/thing:16627>) and are licensed under the
+Creative Commons - Attribution - Share Alike license (see <https://creativecommons.org/licenses/by-sa/3.0/>)
+
+[printed/printed_pulleys.scad](printed/printed_pulleys.scad) Implementation.
+
+[tests/printed_pulleys.scad](tests/printed_pulleys.scad) Code for this example.
+
+### Functions
+| Function | Description |
+|:--- |:--- |
+| `printed_pulley_inverted(type)` | Need to print upside down to prevent overhang |
+
+### Modules
+| Module | Description |
+|:--- |:--- |
+| `printed_pulley(type)` | Draw a printable pulley |
+| `printed_pulley_assembly(type, colour = pp1_colour)` | Draw a printed pulley with its grub screws in place |
+| `printed_pulley_teeth(type)` | Draw the pulley's teeth |
+
+![printed_pulleys](tests/png/printed_pulleys.png)
+
+### Vitamins
+| Qty | Module call | BOM entry |
+| ---:|:--- |:---|
+|   1 | `screw(M3_grub_screw, 3)` |  Screw M3 grub x  3mm |
+|   2 | `screw(M3_grub_screw, 4.5)` |  Screw M3 grub x  4.5mm |
+|   2 | `screw(M3_grub_screw, 4)` |  Screw M3 grub x  4mm |
+|   4 | `screw(M3_grub_screw, 6)` |  Screw M3 grub x  6mm |
+|   1 | `screw(M4_grub_screw, 6)` |  Screw M4 grub x  6mm |
+
+### Printed
+| Qty | Filename |
+| ---:|:--- |
+|   1 | printed_pulley_GT2x12_pulley.stl |
+|   1 | printed_pulley_GT2x16_plain_idler.stl |
+|   1 | printed_pulley_GT2x16_pulley.stl |
+|   1 | printed_pulley_GT2x16_toothed_idler.stl |
+|   1 | printed_pulley_GT2x16x7_plain_idler.stl |
+|   1 | printed_pulley_GT2x20_plain_idler.stl |
+|   1 | printed_pulley_GT2x20_toothed_idler.stl |
+|   1 | printed_pulley_GT2x20ob_pulley.stl |
+|   1 | printed_pulley_GT2x20um_pulley.stl |
+|   1 | printed_pulley_T2p5x16_pulley.stl |
+|   1 | printed_pulley_T5x10_pulley.stl |
+
+### Assemblies
+| Qty | Name |
+| ---:|:--- |
+|   1 | printed_pulley_GT2x12_pulley_assembly |
+|   1 | printed_pulley_GT2x16_plain_idler_assembly |
+|   1 | printed_pulley_GT2x16_pulley_assembly |
+|   1 | printed_pulley_GT2x16_toothed_idler_assembly |
+|   1 | printed_pulley_GT2x16x7_plain_idler_assembly |
+|   1 | printed_pulley_GT2x20_plain_idler_assembly |
+|   1 | printed_pulley_GT2x20_toothed_idler_assembly |
+|   1 | printed_pulley_GT2x20ob_pulley_assembly |
+|   1 | printed_pulley_GT2x20um_pulley_assembly |
+|   1 | printed_pulley_T2p5x16_pulley_assembly |
+|   1 | printed_pulley_T5x10_pulley_assembly |
+
+
 <a href="#top">Top</a>

 ---
--- a/tests/png/printed_pulleys.png
+++ b/tests/png/printed_pulleys.png
--- a/tests/printed_pulleys.scad
+++ b/tests/printed_pulleys.scad
@ -23,15 +23,23 @@ include <../printed/printed_pulleys.scad>
 use <../utils/layout.scad>


-module PrintedPulley_test() {
-    layout([for (p = pulleys) pulley_flange_dia(p)]) {
-        rotate(-135)
-            printed_pulley_assembly(pulleys[$i]);
-        translate([0, 20, 0])
-            rotate(45)
-                pulley_assembly(pulleys[$i]);
+module printed_pulley_test(show_metal = false) {
+    layout([for (p = pulleys) pulley_flange_dia(p)]) let(p = pulleys[$i]) {
+        rotate(-145)
+            if($preview)
+                printed_pulley_assembly(p);
+            else
+                printed_pulley(p);
+
+        if(show_metal)
+            not_on_bom()
+                translate([0, 20])
+                    rotate(-145)
+                        pulley_assembly(p);
    }
 }

-if ($preview)
-    PrintedPulley_test();
+if($preview)
+    printed_pulley_test(true);
+else
+    printed_pulley_test();