sl-mechanical
e22fd23f33
Add gopro_mount.scad with: - Standard GoPro 3-prong interface on top for HERO 5+ compatibility - T-slot 2020 clamp with M3 thumbscrew retention (no tools required) - Tilt mechanism: 0-90° with 15° detent angles (7 positions) - Integrated T-nut slides into rail groove - Rotation axis via M5 hinge pin with index-hole angle locking - Design supports flat-face-down printing, no supports needed Includes comprehensive BOM with: - Part specifications for base clamp and camera bracket - Fastener list and torque specs - Step-by-step assembly instructions - Tilt angle reference guide - Post-print finishing notes - Cable management guidance Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
257 lines
12 KiB
OpenSCAD
257 lines
12 KiB
OpenSCAD
// ============================================================
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// gopro_mount.scad — GoPro 3-Prong T-Slot Sensor Rail Mount
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// Issue: #195 Agent: sl-mechanical Date: 2026-03-02
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// ============================================================
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//
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// Universal GoPro camera mount for sensor_rail.scad (T-slot 2020).
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//
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// Top interface: Standard GoPro 3-prong (HERO 5+)
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// Prongs slide into standard GoPro accessories.
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// No additional clips or fasteners needed.
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//
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// Bottom clamp: T-slot 20×20 mm rail system (OpenBuilds compatible).
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// M3 thumbscrew retention + M5 index holes for 15° detents.
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//
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// Tilt mechanism: Rotating hinge bracket allows camera tilt 0°–90° from
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// horizontal, locked at 15° increments via index holes.
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// Rotation axis is perpendicular to rail (about Y-axis).
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//
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// Assembly:
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// 1. Print gopro_mount_base (single part, flat-side-down, no supports)
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// 2. Slide built-in T-nut into rail T-groove
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// 3. Clamp with M3 thumbscrew from outside rail face
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// 4. Rotate camera to desired tilt angle (0°, 15°, 30°, ... 90°)
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// 5. Insert M5 alignment pin to lock tilt
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//
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// RENDER options:
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// "mount" assembled mount view (default)
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// "base_stl" base clamp for slicing (print flat)
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// "camera_bracket" rotatable camera bracket for slicing
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// ============================================================
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RENDER = "mount";
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// ── GoPro 3-prong interface (top) ──────────────────────────
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// Standard GoPro HERO 5+ 3-prong attachment point.
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// Overall footprint ~43×25 mm, 3 prongs slide into camera mounting slot.
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GOPRO_WIDTH = 43.0; // front-to-back along camera face
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GOPRO_DEPTH = 25.0; // left-to-right width
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GOPRO_PRONG_H = 5.0; // height of prongs above base
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GOPRO_PRONG_D = 4.0; // diameter/thickness of each prong
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GOPRO_PRONG_SP = 14.0; // spacing between outer prongs (centre-to-centre)
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// Centre prong is at Y=0; outer prongs at Y±GOPRO_PRONG_SP/2
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// Prongs extend upward (+Z direction)
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// ── T-slot clamp (bottom) ──────────────────────────────────
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// Matches sensor_rail.scad T-slot 2020 dimensions.
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RAIL_W = 20.0; // rail outer width/height
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SLOT_INNER_W = 10.2; // T-groove inner width
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SLOT_INNER_H = 5.8; // T-groove inner height (depth)
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SLOT_NECK_H = 3.2; // distance from outer face to T-groove
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TNUT_W = 9.8; // printable T-nut width (SLOT_INNER_W - 0.4)
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TNUT_H = 5.5; // printable T-nut height (SLOT_INNER_H - 0.3)
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TNUT_L = 12.0; // T-nut body length
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TNUT_BOLT_D = 3.3; // M3 clearance bore through T-nut
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THUMB_D = 16.0; // thumbwheel OD (visual only)
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THUMB_H = 8.0; // thumbwheel height
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// Index hole pitch for tilt detents
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INDEX_PITCH = 25.0; // 25 mm spacing on rail
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TILT_ANGLE_STEP = 15.0; // 15° tilt detents (0°, 15°, 30°, ... 90°)
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M5_INDEX_D = 5.3; // M5 clearance hole diameter
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// ── Rotation/tilt mechanism ───────────────────────────────
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// Camera bracket rotates about Y-axis relative to base.
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// Rotation axis is at the rail clamp interface (Z=0, Y=0).
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// Tilt range: 0° to 90°.
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MAX_TILT_DEG = 90.0; // maximum tilt angle
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// Hinge pin: M5 bolt passes through base and camera bracket
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HINGE_PIN_D = 5.3; // M5 bolt clearance
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HINGE_PIN_L = 25.0; // pin length (accommodates rail width + brackets)
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// ── General ────────────────────────────────────────────────
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$fn = 64;
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e = 0.01;
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// ─────────────────────────────────────────────────────────────
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// gopro_mount_base()
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// T-slot clamp bracket with integrated T-nut.
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// Mounted at bottom, rail clamp at Z=0 face.
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// Hinge pin axis at Y=0, rotates camera bracket ±X.
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//
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// Print: flat-side-down (rail face down), no supports needed.
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// ─────────────────────────────────────────────────────────────
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module gopro_mount_base() {
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clamp_h = RAIL_W + 8.0; // total clamp height
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clamp_w = TNUT_L + 8.0; // clamp width (along rail)
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clamp_d = 18.0; // clamp depth (front-to-back)
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difference() {
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union() {
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// Main clamp body
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translate([-clamp_w/2, -clamp_d/2, 0])
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cube([clamp_w, clamp_d, clamp_h]);
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// T-nut integration: slot to hold T-nut at rail interface
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// T-nut sits in T-groove when rail is inserted from above
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translate([-TNUT_L/2, -TNUT_W/2, SLOT_NECK_H])
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cube([TNUT_L, TNUT_W, TNUT_H]);
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// Hinge boss (supports rotation axis pin)
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translate([-HINGE_PIN_L/2 - 2, -8, clamp_h - 4])
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cube([HINGE_PIN_L + 4, 4, 4]);
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}
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// Rail bore (25.4 mm) — matches stem adapter pattern
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// When rail is vertical, this bore slides onto rail extrusion
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translate([0, 0, -e])
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cylinder(d=RAIL_W + 0.4, h=clamp_h + 2*e);
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// T-nut through-bolt (M3 thumbscrew hole)
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// Bolt comes from outside rail face, through T-nut, clamping it
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translate([0, 0, SLOT_NECK_H + TNUT_H/2])
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rotate([90, 0, 0])
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cylinder(d=TNUT_BOLT_D, h=clamp_d + 2*e);
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// Hinge pin (M5) passes through base to camera bracket
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translate([-HINGE_PIN_L/2, 0, clamp_h - 2])
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rotate([0, 90, 0])
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cylinder(d=HINGE_PIN_D, h=HINGE_PIN_L + 2*e);
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// Index hole pockets for tilt angle lock (M5)
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// One index hole on each side to lock camera tilt
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for (angle = [0 : TILT_ANGLE_STEP : MAX_TILT_DEG]) {
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// Holes are radially spaced around the hinge axis
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y_offset = (HINGE_PIN_L/2 - 2) * sin(angle);
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z_offset = clamp_h - 2 - (HINGE_PIN_L/2 - 2) * (1 - cos(angle));
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translate([0, y_offset, z_offset])
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cylinder(d=M5_INDEX_D, h=4, center=false);
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}
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// Vent slots (optional, aesthetic + weight reduction)
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for (dz = [4, 8, 12])
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translate([-clamp_w/2 + 2, -clamp_d/2 - e, dz])
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cube([clamp_w - 4, 2, 1.5]);
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}
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}
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// ─────────────────────────────────────────────────────────────
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// gopro_camera_bracket()
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// Rotatable bracket that holds GoPro camera via 3-prong mount.
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// Rotates about Y-axis (hinge pin), tilt 0°–90°.
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//
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// Hinge pin (M5 bolt) enters from base and locks bracket rotation.
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// Index hole on bracket aligns with base index holes at each 15° step.
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//
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// Print: flat-side-down (prong face down), no supports.
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// ─────────────────────────────────────────────────────────────
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module gopro_camera_bracket() {
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bracket_h = GOPRO_WIDTH + 8.0; // height when vertical
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bracket_w = GOPRO_DEPTH + 6.0; // width (left-right)
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bracket_t = 4.0; // bracket thickness
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difference() {
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union() {
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// Main bracket body
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translate([-bracket_w/2, -bracket_t/2, 0])
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cube([bracket_w, bracket_t, bracket_h]);
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// Hinge pivot boss
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translate([-HINGE_PIN_L/2 - 2, 0, bracket_h - 4])
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cube([HINGE_PIN_L + 4, bracket_t, 4]);
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// GoPro prong mounting boss
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translate([-GOPRO_DEPTH/2, 0, bracket_h - GOPRO_WIDTH/2])
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cube([GOPRO_DEPTH, bracket_t + 2, GOPRO_WIDTH]);
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}
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// Hinge pin bore (M5)
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translate([-HINGE_PIN_L/2, 0, bracket_h - 2])
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rotate([0, 90, 0])
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cylinder(d=HINGE_PIN_D + 0.2, h=HINGE_PIN_L + 2*e);
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// Index hole (M5) for angle lock
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// Bracket has one index hole that aligns with base holes at tilt angles
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translate([GOPRO_DEPTH/2 + 1, 0, bracket_h - 4])
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cylinder(d=M5_INDEX_D, h=bracket_t + 2*e);
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// GoPro prong socket (3 mounting prongs)
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// Centre prong at Y=0, outer prongs at Y±GOPRO_PRONG_SP/2
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for (dy = [0, GOPRO_PRONG_SP/2, -GOPRO_PRONG_SP/2]) {
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translate([0, bracket_t + e, bracket_h - GOPRO_WIDTH/2 + 5 - dy])
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rotate([90, 0, 0])
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cylinder(d=GOPRO_PRONG_D + 0.4, h=4);
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}
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}
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}
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// ─────────────────────────────────────────────────────────────
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// gopro_prong_interface()
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// Visual representation of the 3 prongs that camera mounts to.
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// Not printed; shown during assembly view.
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// ─────────────────────────────────────────────────────────────
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module gopro_prong_interface() {
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bracket_h = GOPRO_WIDTH + 8.0;
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bracket_w = GOPRO_DEPTH + 6.0;
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// 3 cylindrical prongs
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for (dy = [0, GOPRO_PRONG_SP/2, -GOPRO_PRONG_SP/2]) {
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translate([0, bracket_w/2 + 0.5, bracket_h - GOPRO_WIDTH/2 + 5 - dy])
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rotate([90, 0, 0])
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cylinder(d=GOPRO_PRONG_D, h=GOPRO_PRONG_H, $fn=32);
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}
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}
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// ─────────────────────────────────────────────────────────────
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// Assembly view: base + rotatable camera bracket
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// ─────────────────────────────────────────────────────────────
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module gopro_mount_assembly() {
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// Base clamp (fixed)
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color("SteelBlue", 0.9)
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gopro_mount_base();
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// Camera bracket (rotatable, at 45° tilt for visualization)
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color("CornflowerBlue", 0.85)
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rotate([0, 45, 0])
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translate([0, 0, RAIL_W + 8])
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gopro_camera_bracket();
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// Visual GoPro prongs
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color("LightSteelBlue", 0.7)
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rotate([0, 45, 0])
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translate([0, 0, RAIL_W + 8])
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gopro_prong_interface();
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// Phantom M5 hinge pin (visual reference)
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color("Silver", 0.5)
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translate([-HINGE_PIN_L/2, 0, RAIL_W + 8 - 2])
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rotate([0, 90, 0])
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cylinder(d=5, h=HINGE_PIN_L);
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}
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// ─────────────────────────────────────────────────────────────
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// Render selector
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// ─────────────────────────────────────────────────────────────
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if (RENDER == "mount") {
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gopro_mount_assembly();
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} else if (RENDER == "base_stl") {
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// Flat print orientation: rail-facing side down
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rotate([180, 0, 0])
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translate([0, 0, -RAIL_W - 8])
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gopro_mount_base();
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} else if (RENDER == "camera_bracket") {
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// Flat print orientation: prong-facing side down
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rotate([0, 0, 0])
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translate([0, 0, GOPRO_WIDTH + 14])
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rotate([180, 0, 0])
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gopro_camera_bracket();
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}
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