Merge branch 'martinbudden-coreXY_belts'

This commit is contained in:
Chris Palmer 2021-03-06 16:39:44 +00:00
commit a94e462f34
4 changed files with 411 additions and 18 deletions

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@ -24,24 +24,24 @@ A list of changes classified as breaking, additions or fixes is maintained in [C
<tr><td> <a href = "#Axials">Axials</a> </td><td> <a href = "#Jack">Jack</a> </td><td> <a href = "#Rails">Rails</a> </td><td> <a href = "#Box">Box</a> </td><td> <a href = "#Annotation">Annotation</a> </td><td> <a href = "#BOM">BOM</a> </td></tr> <tr><td> <a href = "#Axials">Axials</a> </td><td> <a href = "#Jack">Jack</a> </td><td> <a href = "#Rails">Rails</a> </td><td> <a href = "#Box">Box</a> </td><td> <a href = "#Annotation">Annotation</a> </td><td> <a href = "#BOM">BOM</a> </td></tr>
<tr><td> <a href = "#Ball_bearings">Ball_bearings</a> </td><td> <a href = "#KP_pillow_blocks">KP_pillow_blocks</a> </td><td> <a href = "#Ring_terminals">Ring_terminals</a> </td><td> <a href = "#Butt_box">Butt_box</a> </td><td> <a href = "#Bezier">Bezier</a> </td><td> <a href = "#Clip">Clip</a> </td></tr> <tr><td> <a href = "#Ball_bearings">Ball_bearings</a> </td><td> <a href = "#KP_pillow_blocks">KP_pillow_blocks</a> </td><td> <a href = "#Ring_terminals">Ring_terminals</a> </td><td> <a href = "#Butt_box">Butt_box</a> </td><td> <a href = "#Bezier">Bezier</a> </td><td> <a href = "#Clip">Clip</a> </td></tr>
<tr><td> <a href = "#Batteries">Batteries</a> </td><td> <a href = "#LDRs">LDRs</a> </td><td> <a href = "#Rockers">Rockers</a> </td><td> <a href = "#Cable_grommets">Cable_grommets</a> </td><td> <a href = "#Catenary">Catenary</a> </td><td> <a href = "#Global">Global</a> </td></tr> <tr><td> <a href = "#Batteries">Batteries</a> </td><td> <a href = "#LDRs">LDRs</a> </td><td> <a href = "#Rockers">Rockers</a> </td><td> <a href = "#Cable_grommets">Cable_grommets</a> </td><td> <a href = "#Catenary">Catenary</a> </td><td> <a href = "#Global">Global</a> </td></tr>
<tr><td> <a href = "#Belts">Belts</a> </td><td> <a href = "#LED_meters">LED_meters</a> </td><td> <a href = "#Rod">Rod</a> </td><td> <a href = "#Camera_housing">Camera_housing</a> </td><td> <a href = "#Dogbones">Dogbones</a> </td><td> <a href = "#Polyholes">Polyholes</a> </td></tr> <tr><td> <a href = "#Belts">Belts</a> </td><td> <a href = "#LED_meters">LED_meters</a> </td><td> <a href = "#Rod">Rod</a> </td><td> <a href = "#Camera_housing">Camera_housing</a> </td><td> <a href = "#Core_xy">Core_xy</a> </td><td> <a href = "#Polyholes">Polyholes</a> </td></tr>
<tr><td> <a href = "#Blowers">Blowers</a> </td><td> <a href = "#LEDs">LEDs</a> </td><td> <a href = "#SCS_bearing_blocks">SCS_bearing_blocks</a> </td><td> <a href = "#Carriers">Carriers</a> </td><td> <a href = "#Fillet">Fillet</a> </td><td> <a href = "#Rounded_rectangle">Rounded_rectangle</a> </td></tr> <tr><td> <a href = "#Blowers">Blowers</a> </td><td> <a href = "#LEDs">LEDs</a> </td><td> <a href = "#SCS_bearing_blocks">SCS_bearing_blocks</a> </td><td> <a href = "#Carriers">Carriers</a> </td><td> <a href = "#Dogbones">Dogbones</a> </td><td> <a href = "#Rounded_rectangle">Rounded_rectangle</a> </td></tr>
<tr><td> <a href = "#Bulldogs">Bulldogs</a> </td><td> <a href = "#Leadnuts">Leadnuts</a> </td><td> <a href = "#SK_brackets">SK_brackets</a> </td><td> <a href = "#Corner_block">Corner_block</a> </td><td> <a href = "#Gears">Gears</a> </td><td> <a href = "#Sphere">Sphere</a> </td></tr> <tr><td> <a href = "#Bulldogs">Bulldogs</a> </td><td> <a href = "#Leadnuts">Leadnuts</a> </td><td> <a href = "#SK_brackets">SK_brackets</a> </td><td> <a href = "#Corner_block">Corner_block</a> </td><td> <a href = "#Fillet">Fillet</a> </td><td> <a href = "#Sphere">Sphere</a> </td></tr>
<tr><td> <a href = "#Buttons">Buttons</a> </td><td> <a href = "#Light_strips">Light_strips</a> </td><td> <a href = "#SMDs">SMDs</a> </td><td> <a href = "#Door_hinge">Door_hinge</a> </td><td> <a href = "#Hanging_hole">Hanging_hole</a> </td><td> <a href = "#Teardrops">Teardrops</a> </td></tr> <tr><td> <a href = "#Buttons">Buttons</a> </td><td> <a href = "#Light_strips">Light_strips</a> </td><td> <a href = "#SMDs">SMDs</a> </td><td> <a href = "#Door_hinge">Door_hinge</a> </td><td> <a href = "#Gears">Gears</a> </td><td> <a href = "#Teardrops">Teardrops</a> </td></tr>
<tr><td> <a href = "#Cable_strips">Cable_strips</a> </td><td> <a href = "#Linear_bearings">Linear_bearings</a> </td><td> <a href = "#SSRs">SSRs</a> </td><td> <a href = "#Door_latch">Door_latch</a> </td><td> <a href = "#Horiholes">Horiholes</a> </td><td></td></tr> <tr><td> <a href = "#Cable_strips">Cable_strips</a> </td><td> <a href = "#Linear_bearings">Linear_bearings</a> </td><td> <a href = "#SSRs">SSRs</a> </td><td> <a href = "#Door_latch">Door_latch</a> </td><td> <a href = "#Hanging_hole">Hanging_hole</a> </td><td></td></tr>
<tr><td> <a href = "#Cameras">Cameras</a> </td><td> <a href = "#Magnets">Magnets</a> </td><td> <a href = "#Screws">Screws</a> </td><td> <a href = "#Drag_chain">Drag_chain</a> </td><td> <a href = "#Layout">Layout</a> </td><td></td></tr> <tr><td> <a href = "#Cameras">Cameras</a> </td><td> <a href = "#Magnets">Magnets</a> </td><td> <a href = "#Screws">Screws</a> </td><td> <a href = "#Drag_chain">Drag_chain</a> </td><td> <a href = "#Horiholes">Horiholes</a> </td><td></td></tr>
<tr><td> <a href = "#Circlips">Circlips</a> </td><td> <a href = "#Mains_sockets">Mains_sockets</a> </td><td> <a href = "#Sealing_strip">Sealing_strip</a> </td><td> <a href = "#Fan_guard">Fan_guard</a> </td><td> <a href = "#Maths">Maths</a> </td><td></td></tr> <tr><td> <a href = "#Circlips">Circlips</a> </td><td> <a href = "#Mains_sockets">Mains_sockets</a> </td><td> <a href = "#Sealing_strip">Sealing_strip</a> </td><td> <a href = "#Fan_guard">Fan_guard</a> </td><td> <a href = "#Layout">Layout</a> </td><td></td></tr>
<tr><td> <a href = "#Components">Components</a> </td><td> <a href = "#Microswitches">Microswitches</a> </td><td> <a href = "#Shaft_couplings">Shaft_couplings</a> </td><td> <a href = "#Fixing_block">Fixing_block</a> </td><td> <a href = "#Offset">Offset</a> </td><td></td></tr> <tr><td> <a href = "#Components">Components</a> </td><td> <a href = "#Microswitches">Microswitches</a> </td><td> <a href = "#Shaft_couplings">Shaft_couplings</a> </td><td> <a href = "#Fixing_block">Fixing_block</a> </td><td> <a href = "#Maths">Maths</a> </td><td></td></tr>
<tr><td> <a href = "#DIP">DIP</a> </td><td> <a href = "#Microview">Microview</a> </td><td> <a href = "#Sheets">Sheets</a> </td><td> <a href = "#Flat_hinge">Flat_hinge</a> </td><td> <a href = "#Quadrant">Quadrant</a> </td><td></td></tr> <tr><td> <a href = "#DIP">DIP</a> </td><td> <a href = "#Microview">Microview</a> </td><td> <a href = "#Sheets">Sheets</a> </td><td> <a href = "#Flat_hinge">Flat_hinge</a> </td><td> <a href = "#Offset">Offset</a> </td><td></td></tr>
<tr><td> <a href = "#D_connectors">D_connectors</a> </td><td> <a href = "#Modules">Modules</a> </td><td> <a href = "#Spades">Spades</a> </td><td> <a href = "#Foot">Foot</a> </td><td> <a href = "#Round">Round</a> </td><td></td></tr> <tr><td> <a href = "#D_connectors">D_connectors</a> </td><td> <a href = "#Modules">Modules</a> </td><td> <a href = "#Spades">Spades</a> </td><td> <a href = "#Foot">Foot</a> </td><td> <a href = "#Quadrant">Quadrant</a> </td><td></td></tr>
<tr><td> <a href = "#Displays">Displays</a> </td><td> <a href = "#Nuts">Nuts</a> </td><td> <a href = "#Spools">Spools</a> </td><td> <a href = "#Handle">Handle</a> </td><td> <a href = "#Rounded_cylinder">Rounded_cylinder</a> </td><td></td></tr> <tr><td> <a href = "#Displays">Displays</a> </td><td> <a href = "#Nuts">Nuts</a> </td><td> <a href = "#Spools">Spools</a> </td><td> <a href = "#Handle">Handle</a> </td><td> <a href = "#Round">Round</a> </td><td></td></tr>
<tr><td> <a href = "#Extrusion_brackets">Extrusion_brackets</a> </td><td> <a href = "#O_ring">O_ring</a> </td><td> <a href = "#Springs">Springs</a> </td><td> <a href = "#PCB_mount">PCB_mount</a> </td><td> <a href = "#Rounded_polygon">Rounded_polygon</a> </td><td></td></tr> <tr><td> <a href = "#Extrusion_brackets">Extrusion_brackets</a> </td><td> <a href = "#O_ring">O_ring</a> </td><td> <a href = "#Springs">Springs</a> </td><td> <a href = "#PCB_mount">PCB_mount</a> </td><td> <a href = "#Rounded_cylinder">Rounded_cylinder</a> </td><td></td></tr>
<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 = "#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_polygon">Rounded_polygon</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 = "#Pocket_handle">Pocket_handle</a> </td><td> <a href = "#Sector">Sector</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 = "#Pocket_handle">Pocket_handle</a> </td><td> <a href = "#Rounded_right_triangle">Rounded_right_triangle</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 = "#Press_fit">Press_fit</a> </td><td> <a href = "#Sweep">Sweep</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 = "#Press_fit">Press_fit</a> </td><td> <a href = "#Sector">Sector</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 = "#Printed_box">Printed_box</a> </td><td> <a href = "#Thread">Thread</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 = "#Printed_box">Printed_box</a> </td><td> <a href = "#Sweep">Sweep</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 = "#Printed_pulleys">Printed_pulleys</a> </td><td> <a href = "#Tube">Tube</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 = "#Printed_pulleys">Printed_pulleys</a> </td><td> <a href = "#Thread">Thread</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 = "#Ribbon_clamp">Ribbon_clamp</a> </td><td></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 = "#Ribbon_clamp">Ribbon_clamp</a> </td><td> <a href = "#Tube">Tube</a> </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 = "#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 = "#SSR_shroud">SSR_shroud</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 = "#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 = "#Screw_knob">Screw_knob</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 = "#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 = "#Socket_box">Socket_box</a> </td><td></td><td></td></tr>
@ -5574,6 +5574,69 @@ The coordinates of the lowest point on the curve can be retrieved by calling `ca
![catenary](tests/png/catenary.png) ![catenary](tests/png/catenary.png)
<a href="#top">Top</a>
---
<a name="Core_xy"></a>
## Core_xy
Parameterised Core XY implementation. Draws the belts and provides utilities for positioning the pulleys.
The belts are positioned according the bottom left "anchor" pulley and the top right drive pulley.
Implementation has the following features:
1. The drive and idler pulleys may be different sizes.
2. The belt separation is parameterised.
3. The separation of the plain and toothed pulleys on the Y carriages is parameterised, in both the X and the Y direction.
4. The drive pulleys may be offset in the X and Y directions. If this is done, extra idler pulleys are added. This
allows flexible positioning of the motors.
[utils/core_xy.scad](utils/core_xy.scad) Implementation.
[tests/core_xy.scad](tests/core_xy.scad) Code for this example.
### Properties
| Function | Description |
|:--- |:--- |
| `coreXY_belt(type)` | Belt type |
| `coreXY_drive_pulley(type)` | Drive pulley type |
| `coreXY_lower_belt_colour(type)` | Colour of the lower belt |
| `coreXY_lower_tooth_colour(type)` | Colour of the lower belt's teeth |
| `coreXY_plain_idler(type)` | Plain idler type |
| `coreXY_toothed_idler(type)` | Toothed idler type |
| `coreXY_upper_belt_colour(type)` | Colour of the upper belt |
| `coreXY_upper_tooth_colour(type)` | Colour of the upper belt's teeth |
### Functions
| Function | Description |
|:--- |:--- |
| `coreXY_coincident_separation(type)` | Value of x, y separation to make y-carriage pulleys coincident |
| `coreXY_drive_plain_idler_offset(type)` | Offset of plain drive idler pulley |
| `coreXY_drive_pulley_x_alignment(type)` | Belt alignment offset of the drive pulley relative to the anchor pulley |
| `coreXY_drive_toothed_idler_offset(type)` | Offset of toothed drive idler pulley |
| `coreXY_plain_idler_offset(type)` | Offset of y-carriage plain idler |
| `coreXY_toothed_idler_offset(type)` | offset of y-carriage toothed idler |
### Modules
| Module | Description |
|:--- |:--- |
| `coreXY(type, size, pos, separation, x_gap, plain_idler_offset = 0, upper_drive_pulley_offset, lower_drive_pulley_offset, show_pulleys = false)` | Wrapper module to draw both belts of a coreXY setup |
| `coreXY_belts(type, carriagePosition, coreXYPosBL, coreXYPosTR, separation, x_gap = 20, upper_drive_pulley_offset = [0, 0], lower_drive_pulley_offset = [0, 0], show_pulleys = false)` | Draw the coreXY belts |
| `coreXY_half(type, size, pos, separation_y = 0, x_gap = 0, plain_idler_offset = 0, drive_pulley_offset = [0, 0], show_pulleys = false, lower_belt = false, hflip = false)` | Draw one belt of a coreXY setup |
![core_xy](tests/png/core_xy.png)
### Vitamins
| Qty | Module call | BOM entry |
| ---:|:--- |:---|
| 1 | `belt(GT2x6, [ ... ], [10.0078, 11.69], [0, -24.686])` | Belt GT2 x 6mm x 742mm |
| 1 | `belt(GT2x6, [ ... ], [10.0078, 11.69], [0, -24.686])` | Belt GT2 x 6mm x 852mm |
| 7 | `pulley(GT2x16_toothed_idler)` | Pulley GT2 idler 16 teeth |
| 3 | `pulley(GT2x16_plain_idler)` | Pulley GT2 idler smooth 9.63mm |
| 2 | `pulley(GT2x20ob_pulley)` | Pulley GT2OB 20 teeth |
| 8 | `screw(M3_cap_screw, 20)` | Screw M3 cap x 20mm |
| 4 | `screw(M3_grub_screw, 6)` | Screw M3 grub x 6mm |
| 2 | `NEMA(NEMA17M)` | Stepper motor NEMA17 x 40mm |
<a href="#top">Top</a> <a href="#top">Top</a>
--- ---

134
tests/core_xy.scad Normal file
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@ -0,0 +1,134 @@
//
// NopSCADlib Copyright Chris Palmer 2020
// nop.head@gmail.com
// hydraraptor.blogspot.com
//
// This file is part of NopSCADlib.
//
// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
// GNU General Public License as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along with NopSCADlib.
// If not, see <https://www.gnu.org/licenses/>.
//
include <../core.scad>
include <../vitamins/pulleys.scad>
include <../vitamins/screws.scad>
include <../vitamins/stepper_motors.scad>
include <../vitamins/washers.scad>
include <../utils/core_xy.scad>
module coreXY_belts_test() {
coreXY_type = coreXY_GT2_20_16;
plain_idler = coreXY_plain_idler(coreXY_type);
toothed_idler = coreXY_toothed_idler(coreXY_type);
coreXYPosBL = [0, 0, 0];
coreXYPosTR = [200, 150, 0];
separation = [0, coreXY_coincident_separation(coreXY_type).y, pulley_height(plain_idler) + washer_thickness(M3_washer)];
pos = [100, 50];
upper_drive_pulley_offset = [40, 10];
lower_drive_pulley_offset = [0, 0];
coreXY_belts(coreXY_type,
carriagePosition = pos,
coreXYPosBL = coreXYPosBL,
coreXYPosTR = coreXYPosTR,
separation = separation,
x_gap = 10,
upper_drive_pulley_offset = upper_drive_pulley_offset,
lower_drive_pulley_offset = lower_drive_pulley_offset,
show_pulleys = true);
translate([coreXYPosBL.x + separation.x/2, coreXYPosTR.y + upper_drive_pulley_offset.y, separation.z/2]) {
// add the upper drive pulley stepper motor
translate([coreXY_drive_pulley_x_alignment(coreXY_type) + upper_drive_pulley_offset.x, 0, -pulley_height(coreXY_drive_pulley(coreXY_type))])
NEMA(NEMA17M);
// add the screws for the upper drive offset idler pulleys if required
if (upper_drive_pulley_offset.x > 0) {
translate(coreXY_drive_plain_idler_offset(coreXY_type))
translate_z(-pulley_offset(plain_idler))
screw(M3_cap_screw, 20);
translate(coreXY_drive_toothed_idler_offset(coreXY_type))
translate_z(-pulley_offset(toothed_idler))
screw(M3_cap_screw, 20);
} else if (upper_drive_pulley_offset.x < 0) {
translate([-pulley_od(plain_idler), coreXY_drive_plain_idler_offset(coreXY_type).y])
translate_z(-pulley_offset(plain_idler))
screw(M3_cap_screw, 20);
translate([2*coreXY_drive_pulley_x_alignment(coreXY_type), coreXY_drive_toothed_idler_offset(coreXY_type).y])
translate_z(-pulley_offset(toothed_idler))
screw(M3_cap_screw, 20);
}
}
translate([coreXYPosTR.x - separation.x/2, coreXYPosTR.y + lower_drive_pulley_offset.y, -separation.z/2]) {
// add the lower drive pulley stepper motor
translate([-coreXY_drive_pulley_x_alignment(coreXY_type) + lower_drive_pulley_offset.x, 0, -pulley_height(coreXY_drive_pulley(coreXY_type))])
NEMA(NEMA17M);
// add the screws for the lower drive offset idler pulleys if required
if (lower_drive_pulley_offset.x < 0) {
translate([-coreXY_drive_plain_idler_offset(coreXY_type).x, coreXY_drive_plain_idler_offset(coreXY_type).y])
translate_z(-pulley_offset(plain_idler))
screw(M3_cap_screw, 20);
translate(coreXY_drive_toothed_idler_offset(coreXY_type))
translate_z(-pulley_offset(toothed_idler))
screw(M3_cap_screw, 20);
} else if (lower_drive_pulley_offset.x > 0) {
translate([pulley_od(plain_idler), coreXY_drive_plain_idler_offset(coreXY_type).y])
translate_z(-pulley_offset(plain_idler))
screw(M3_cap_screw, 20);
translate([-2*coreXY_drive_pulley_x_alignment(coreXY_type), coreXY_drive_toothed_idler_offset(coreXY_type).y])
translate_z(-pulley_offset(toothed_idler))
screw(M3_cap_screw, 20);
}
}
// add the screw for the left upper idler pulley
translate([coreXYPosBL.x + separation.x/2, coreXYPosBL.y, separation.z])
screw(M3_cap_screw, 20);
// add the screw for the right upper idler pulley
translate([coreXYPosTR.x + separation.x/2, coreXYPosBL.y, separation.z])
screw(M3_cap_screw, 20);
if (separation.x != 0) {
// add the screw for the left lower idler pulley
translate([coreXYPosBL.x - separation.x/2, coreXYPosBL.y, 0])
screw(M3_cap_screw, 20);
// add the screw for the right lower idler pulley
translate([coreXYPosTR.x - separation.x/2, coreXYPosBL.y, 0])
screw(M3_cap_screw, 20);
}
translate([-separation.x/2, pos.y + coreXYPosBL.y -separation.y/2, -separation.z/2 + pulley_height(plain_idler)/2]) {
// add the screw for the left Y carriage toothed idler
translate([coreXYPosBL.x, coreXY_toothed_idler_offset(coreXY_type).y, 0])
screw(M3_cap_screw, 20);
// add the screw for the left Y carriage plain idler
translate([coreXYPosBL.x + separation.x + coreXY_plain_idler_offset(coreXY_type).x, separation.y + coreXY_plain_idler_offset(coreXY_type).y, separation.z])
screw(M3_cap_screw, 20);
// add the screw for the right Y carriage toothed idler
translate([coreXYPosTR.x + separation.x, coreXY_toothed_idler_offset(coreXY_type).y, separation.z])
screw(M3_cap_screw, 20);
// add the screw for the right Y carriage plain idler
translate([coreXYPosTR.x - coreXY_plain_idler_offset(coreXY_type).x, separation.y + coreXY_plain_idler_offset(coreXY_type).y, 0])
screw(M3_cap_screw, 20);
}
}
if ($preview)
coreXY_belts_test();

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//
// NopSCADlib Copyright Chris Palmer 2020
// nop.head@gmail.com
// hydraraptor.blogspot.com
//
// This file is part of NopSCADlib.
//
// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
// GNU General Public License as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along with NopSCADlib.
// If not, see <https://www.gnu.org/licenses/>.
//
//
//! Parameterised Core XY implementation. Draws the belts and provides utilities for positioning the pulleys.
//!
//! The belts are positioned according the bottom left "anchor" pulley and the top right drive pulley.
//! Implementation has the following features:
//! 1. The drive and idler pulleys may be different sizes.
//! 2. The belt separation is parameterised.
//! 3. The separation of the plain and toothed pulleys on the Y carriages is parameterised, in both the X and the Y direction.
//! 4. The drive pulleys may be offset in the X and Y directions. If this is done, extra idler pulleys are added. This
//! allows flexible positioning of the motors.
//
include <../core.scad>
include <../vitamins/belts.scad>
include <../vitamins/pulleys.scad>
coreXY_GT2_20_20 = ["coreXY_20_20", GT2x6, GT2x20ob_pulley, GT2x20_toothed_idler, GT2x20_plain_idler, [0, 0, 1], [0, 0, 0.5, 1], [0, 1, 0], [0, 0.5, 0, 1] ];
coreXY_GT2_20_16 = ["coreXY_20_16", GT2x6, GT2x20ob_pulley, GT2x16_toothed_idler, GT2x16_plain_idler, [0, 0, 1], [0, 0, 0.5, 1], [0, 1, 0], [0, 0.5, 0, 1] ];
coreXY_GT2_16_16 = ["coreXY_16_16", GT2x6, GT2x16_pulley, GT2x16_toothed_idler, GT2x16_plain_idler, [0, 0, 1], [0, 0, 0.5, 1], [0, 1, 0], [0, 0.5, 0, 1] ];
function coreXY_belt(type) = type[1]; //! Belt type
function coreXY_drive_pulley(type) = type[2]; //! Drive pulley type
function coreXY_toothed_idler(type) = type[3]; //! Toothed idler type
function coreXY_plain_idler(type) = type[4]; //! Plain idler type
function coreXY_upper_belt_colour(type) = type[5]; //! Colour of the upper belt
function coreXY_upper_tooth_colour(type) = type[6]; //! Colour of the upper belt's teeth
function coreXY_lower_belt_colour(type) = type[7]; //! Colour of the lower belt
function coreXY_lower_tooth_colour(type) = type[8]; //! Colour of the lower belt's teeth
// used to offset the position of the drive pulley and the y-carriage plain idler pulley
// relative to the anchor pulley so that the belts align properly
function coreXY_drive_pulley_x_alignment(type) = //! Belt alignment offset of the drive pulley relative to the anchor pulley
(pulley_od(coreXY_drive_pulley(type)) - pulley_od(coreXY_toothed_idler(type))) / 2;
function coreXY_coincident_separation(type) = //! Value of x, y separation to make y-carriage pulleys coincident
[ -coreXY_plain_idler_offset(type).x, -(pulley_od(coreXY_plain_idler(type)) + pulley_od(coreXY_toothed_idler(type)))/2, 0 ];
function coreXY_plain_idler_offset(type) = //! Offset of y-carriage plain idler
[ (pulley_od(coreXY_plain_idler(type)) + pulley_od(coreXY_drive_pulley(type))) / 2 + coreXY_drive_pulley_x_alignment(type), pulley_od(coreXY_plain_idler(type))/2, 0 ];
function coreXY_toothed_idler_offset(type) = //! offset of y-carriage toothed idler
[ 0, -pulley_pr(coreXY_toothed_idler(type)), 0 ];
// helper functions for positioning idlers when the stepper motor drive pulley is offset
function coreXY_drive_toothed_idler_offset(type) = //! Offset of toothed drive idler pulley
[ 0, coreXY_drive_pulley_x_alignment(type), 0 ];
function coreXY_drive_plain_idler_offset(type) = //! Offset of plain drive idler pulley
[ coreXY_plain_idler_offset(type).x, -(pulley_od(coreXY_plain_idler(type)) + pulley_od(coreXY_drive_pulley(type))) / 2, 0 ];
module coreXY_half(type, size, pos, separation_y = 0, x_gap = 0, plain_idler_offset = 0, drive_pulley_offset = [0, 0], show_pulleys = false, lower_belt = false, hflip = false) { //! Draw one belt of a coreXY setup
// y-carriage toothed pulley
p0_type = coreXY_toothed_idler(type);
p0 = [ size.x / 2, -size.y / 2 - pulley_od(p0_type) / 2 + pos.y - separation_y / 2 ];
// bottom right toothed idler pulley
p1_type = p0_type;
p1 = [ size.x / 2, -size.y / 2 ];
// bottom left anchor toothed idler pulley
p2_type = p0_type;
p2 = [ -size.x / 2, -size.y / 2 ];
// stepper motor drive pulley
p3d_type = coreXY_drive_pulley(type);
p3d = [ -size.x / 2 + coreXY_drive_pulley_x_alignment(type) + drive_pulley_offset.x,
size.y / 2 + drive_pulley_offset.y
];
// toothed idler for offset stepper motor drive pulley
p3t_type = coreXY_toothed_idler(type);
p3t = [ -size.x / 2 + (drive_pulley_offset.x > 0 ? 0 : 2*coreXY_drive_pulley_x_alignment(type)),
size.y / 2 + coreXY_drive_pulley_x_alignment(type) + drive_pulley_offset.y
];
// y-carriage plain pulley
p4_type = coreXY_plain_idler(type);
p4 = [ -size.x / 2 + pulley_od(p4_type) / 2 + pulley_od(p3d_type) / 2 + coreXY_drive_pulley_x_alignment(type) + plain_idler_offset,
-size.y / 2 + pulley_od(p4_type) / 2 + pos.y + separation_y / 2
];
// plain idler for offset stepper motor drive pulley
p3p_type = p4_type;
p3p = [ drive_pulley_offset.x > 0 ? p4.x : -p0.x - pulley_od(p0_type),
size.y / 2 - pulley_od(p3p_type) / 2 - pulley_od(p3d_type) / 2 + drive_pulley_offset.y
];
// dummy pulleys for y separation
p5_type = p4_type;
p5 = [ pos.x - size.x / 2, -size.y / 2 + pos.y + separation_y / 2 ];
p6_type = p0_type;
p6 = [ pos.x - size.x / 2, -size.y / 2 + pos.y - separation_y / 2 ];
module show_pulleys(show_pulleys) {// Allows the pulley colour to be set for debugging
if (is_list(show_pulleys))
color(show_pulleys)
children();
else if (show_pulleys)
children();
}
show_pulleys(show_pulleys) {
translate(p0)
pulley_assembly(p0_type); // y-carriage toothed pulley
translate(p1)
pulley_assembly(p1_type); // bottom right toothed idler pulley
translate(p2)
pulley_assembly(p2_type); // bottom left anchor toothed idler pulley
translate(p3d)
hflip(hflip)
pulley_assembly(p3d_type); // top left stepper motor drive pulley
if (drive_pulley_offset.x) { // idler pulleys for offset stepper motor drive pulley
translate(p3t)
pulley_assembly(p3t_type); // toothed idler
translate(p3p)
pulley_assembly(p3p_type); // plain idler
}
translate(p4)
pulley_assembly(p4_type); // y-carriage plain pulley
}
path0a = [
[ p0.x, p0.y, pulley_od(p0_type) / 2 ],
[ p1.x, p1.y, pulley_od(p1_type) / 2 ],
[ p2.x, p2.y, pulley_od(p2_type) / 2 ]
];
path0b = [
[ p3d.x, p3d.y, pulley_od(p3d_type) / 2 ],
[ p4.x, p4.y, -pulley_od(p4_type) / 2 ]
];
path0c = [
[ p3t.x, p3t.y, pulley_od(p3t_type) / 2 ],
[ p3d.x, p3d.y, pulley_od(p3d_type) / 2 ],
[ p3p.x, p3p.y, -pulley_od(p3p_type) / 2 ],
[ p4.x, p4.y, -pulley_od(p4_type) / 2 ]
];
path0d = [
[ p3p.x, p3p.y, -pulley_od(p3p_type) / 2 ],
[ p3d.x, p3d.y, pulley_od(p3d_type) / 2 ],
[ p3t.x, p3t.y, pulley_od(p3t_type) / 2 ],
[ p4.x, p4.y, -pulley_od(p4_type) / 2 ]
];
path1 = [ // use eps for corner radius to get sharp corners so this part of the belt is deleted by the gap
[ p5.x, p5.y, eps ],
[ p6.x, p6.y, eps ]
];
belt = coreXY_belt(type);
path0 = drive_pulley_offset.x == 0 ? concat(path0a, path0b) : drive_pulley_offset.x > 0 ? concat(path0a, path0c) : concat(path0a, path0d);
path = separation_y == 0 ? path0 : concat(path0, path1);
belt(type = belt,
points = path,
gap = [ x_gap + eps, abs(separation_y) + 2 ],
gap_pos = [ pos.x - size.x / 2, pos.y - size.y / 2 + belt_pitch_height(belt) - belt_thickness(belt) / 2 ],
belt_colour = lower_belt ? coreXY_lower_belt_colour(type) : coreXY_upper_belt_colour(type),
tooth_colour = lower_belt ? coreXY_lower_tooth_colour(type) : coreXY_upper_tooth_colour(type));
}
module coreXY(type, size, pos, separation, x_gap, plain_idler_offset = 0, upper_drive_pulley_offset, lower_drive_pulley_offset, show_pulleys = false) { //! Wrapper module to draw both belts of a coreXY setup
translate([size.x / 2 - separation.x / 2, size.y / 2, -separation.z / 2]) {
// lower belt
hflip()
explode(25)
coreXY_half(type, size, [size.x - pos.x - separation.x, pos.y], separation.y, x_gap, plain_idler_offset, [-lower_drive_pulley_offset.x, lower_drive_pulley_offset.y], show_pulleys, lower_belt = true, hflip = true);
// upper belt
translate([separation.x, 0, separation.z])
explode(25)
coreXY_half(type, size, [pos.x, pos.y], separation.y, x_gap, plain_idler_offset, upper_drive_pulley_offset, show_pulleys, lower_belt = false, hflip=false);
}
}
module coreXY_belts(type, carriagePosition, coreXYPosBL, coreXYPosTR, separation, x_gap = 20, upper_drive_pulley_offset = [0, 0], lower_drive_pulley_offset = [0, 0], show_pulleys = false) { //! Draw the coreXY belts
assert(coreXYPosBL.z == coreXYPosTR.z);
coreXYSize = coreXYPosTR - coreXYPosBL;
translate(coreXYPosBL)
coreXY(type, coreXYSize, [carriagePosition.x - coreXYPosBL.x + separation.x / 2, carriagePosition.y - coreXYPosBL.y], separation = separation, x_gap = x_gap, plain_idler_offset = 0, upper_drive_pulley_offset = upper_drive_pulley_offset, lower_drive_pulley_offset = lower_drive_pulley_offset, show_pulleys = show_pulleys);
}