266 lines
12 KiB
OpenSCAD
266 lines
12 KiB
OpenSCAD
// ============================================================
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// canable_mount.scad — CANable 2.0 USB-CAN Adapter Cradle
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// Issue #654 / sl-mechanical 2026-03-16
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// ============================================================
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// Snap-fit cradle for CANable 2.0 PCB (~60 × 18 × 10 mm).
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// Attaches to 2020 aluminium T-slot rail via 2× M5 T-nuts.
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//
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// Port access:
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// USB-C port — X− end wall cutout (connector protrudes through)
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// CAN terminal — X+ end wall cutout (CANH / CANL / GND wire exit)
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// LED status window— slot in Y+ side wall, PCB top-face LEDs visible
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//
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// Retention: snap-fit cantilever lips on both side walls (PETG flex).
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// Cable strain relief: zip-tie boss pair on X+ shelf (CAN wires).
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//
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// ⚠ VERIFY WITH CALIPERS BEFORE PRINTING:
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// PCB_L, PCB_W board outline
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// USBC_W, USBC_H USB-C shell at X− edge
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// TERM_W, TERM_H 3-pos terminal block at X+ edge
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// LED_X_CTR, LED_WIN_W LED window position on Y+ wall
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//
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// Print settings (PETG):
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// 3 perimeters, 40 % gyroid infill, no supports, 0.2 mm layer
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// Print orientation: open face UP (as modelled)
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//
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// BOM:
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// 2 × M5×10 BHCS + 2 × M5 slide-in T-nut (2020 rail)
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//
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// Export commands:
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// openscad -D 'RENDER="mount"' -o canable_mount.stl canable_mount.scad
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// openscad -D 'RENDER="assembly"' -o canable_assembly.png canable_mount.scad
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// ============================================================
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RENDER = "assembly"; // mount | assembly
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$fn = 48;
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EPS = 0.01;
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// ── ⚠ Verify before printing ─────────────────────────────────
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// CANable 2.0 PCB
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PCB_L = 60.0; // board length (X: USB-C end → terminal end)
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PCB_W = 18.0; // board width (Y)
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PCB_T = 1.6; // board thickness
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COMP_H = 8.5; // tallest component above board (USB-C shell ≈ 3.5 mm;
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// terminal block ≈ 8.5 mm)
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// USB-C connector (at X− end face of PCB)
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USBC_W = 9.5; // connector outer width
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USBC_H = 3.8; // connector outer height above board surface
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USBC_Z0 = 0.0; // connector bottom offset above board surface
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// CAN screw-terminal block (at X+ end face, 3-pos 5.0 mm pitch)
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TERM_W = 16.0; // terminal block span (3 × 5 mm + housing)
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TERM_H = 9.0; // terminal block height above board surface
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TERM_Z0 = 0.5; // terminal bottom offset above board surface
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// Status LED window (LEDs near USB-C end on PCB top face)
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// Rectangular slot cut in Y+ side wall — LEDs visible from the side
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LED_X_CTR = 11.0; // LED zone centre measured from PCB X− edge
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LED_WIN_W = 14.0; // window width (X)
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LED_WIN_H = 5.5; // window height (Z) — opens top portion of side wall
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// ── Cradle geometry ──────────────────────────────────────────
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WALL_T = 2.5; // side/end wall thickness
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FLOOR_T = 4.0; // floor plate thickness (accommodates M5 BHCS head pocket)
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CL_SIDE = 0.30; // Y clearance per side (total 0.6 mm play)
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CL_END = 0.40; // X clearance per end
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// Interior cavity
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INN_W = PCB_W + 2*CL_SIDE; // Y span
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INN_L = PCB_L + 2*CL_END; // X span
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INN_H = PCB_T + COMP_H + 1.2; // Z height (board + tallest comp + margin)
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// Outer body
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OTR_W = INN_W + 2*WALL_T; // Y
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OTR_L = INN_L + 2*WALL_T; // X
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OTR_H = FLOOR_T + INN_H; // Z
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// PCB reference origin within body (lower-left corner of board)
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PCB_X0 = WALL_T + CL_END; // board X start inside body
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PCB_Y0 = WALL_T + CL_SIDE; // board Y start inside body
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PCB_Z0 = FLOOR_T; // board bottom sits on floor
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// ── Snap-fit lips ─────────────────────────────────────────────
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// Cantilever ledge on inner face of each side wall, at PCB-top Z.
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// Tapered (chamfered) entry guides PCB in from above.
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SNAP_IN = 0.8; // how far inward ledge protrudes over PCB edge
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SNAP_T = 1.2; // snap-arm thickness (thin for PETG flex)
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SNAP_H = 4.0; // cantilever arm height (root at OTR_H, tip near PCB_Z0+PCB_T)
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SNAP_L = 18.0; // arm length along X (centred on PCB, shorter = more flex)
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// Snap on Y− wall protrudes in +Y direction; Y+ wall protrudes in −Y direction
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// ── M5 T-nut mount (2020 rail) ────────────────────────────────
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M5_D = 5.3; // M5 bolt clearance bore
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M5_HEAD_D = 9.5; // M5 BHCS head pocket diameter (from bottom face)
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M5_HEAD_H = 3.0; // BHCS head pocket depth
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M5_SPAC = 20.0; // bolt spacing along X (centred on cradle)
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// Standard M5 slide-in T-nuts used — no T-nut pocket moulded in.
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// ── Cable strain relief ───────────────────────────────────────
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// Two zip-tie anchor bosses on a shelf inside the X+ end, straddling
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// the CAN terminal wires.
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SR_BOSS_OD = 7.0; // boss outer diameter
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SR_BOSS_H = 5.5; // boss height above floor
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SR_SLOT_W = 3.5; // zip-tie slot width
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SR_SLOT_T = 2.2; // zip-tie slot through-height
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// Boss Y positions (straddle terminal block)
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SR_Y1 = WALL_T + INN_W * 0.25;
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SR_Y2 = WALL_T + INN_W * 0.75;
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SR_X = OTR_L - WALL_T - SR_BOSS_OD/2 - 2.5; // just inside X+ end wall
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// ─────────────────────────────────────────────────────────────
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module canable_mount() {
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difference() {
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// ── Outer solid body ──────────────────────────────────
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union() {
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cube([OTR_L, OTR_W, OTR_H]);
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// ── Snap cantilever arms on Y− wall (protrude inward +Y) ──
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// Arms hang down from top of Y− wall inner face.
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// Root is flush with inner face (Y = WALL_T); tip at PCB level.
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translate([OTR_L/2 - SNAP_L/2, WALL_T - SNAP_T, OTR_H - SNAP_H])
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cube([SNAP_L, SNAP_T, SNAP_H]);
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// ── Snap cantilever arms on Y+ wall (protrude inward −Y) ──
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translate([OTR_L/2 - SNAP_L/2, OTR_W - WALL_T, OTR_H - SNAP_H])
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cube([SNAP_L, SNAP_T, SNAP_H]);
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// ── Cable strain relief bosses (X+ end, inside) ────
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for (sy = [SR_Y1, SR_Y2])
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translate([SR_X, sy, 0])
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cylinder(d=SR_BOSS_OD, h=SR_BOSS_H);
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}
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// ── Interior cavity ───────────────────────────────────
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translate([WALL_T, WALL_T, FLOOR_T])
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cube([INN_L, INN_W, INN_H + EPS]);
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// ── USB-C cutout — X− end wall ────────────────────────
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// Centred on PCB width; opened from board surface upward
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translate([-EPS,
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PCB_Y0 + PCB_W/2 - (USBC_W + 1.5)/2,
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PCB_Z0 + USBC_Z0 - 0.5])
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cube([WALL_T + 2*EPS, USBC_W + 1.5, USBC_H + 2.5]);
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// ── CAN terminal cutout — X+ end wall ─────────────────
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// Full terminal width + 2 mm margin for screwdriver access;
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// height clears terminal block + wire bend radius
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translate([OTR_L - WALL_T - EPS,
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PCB_Y0 + PCB_W/2 - (TERM_W + 2.0)/2,
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PCB_Z0 + TERM_Z0 - 0.5])
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cube([WALL_T + 2*EPS, TERM_W + 2.0, TERM_H + 5.0]);
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// ── LED status window — Y+ side wall ─────────────────
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// Rectangular slot; LEDs at top-face of PCB are visible through it
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translate([PCB_X0 + LED_X_CTR - LED_WIN_W/2,
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OTR_W - WALL_T - EPS,
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OTR_H - LED_WIN_H])
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cube([LED_WIN_W, WALL_T + 2*EPS, LED_WIN_H + EPS]);
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// ── M5 BHCS head pockets (from bottom face of floor) ──
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for (mx = [OTR_L/2 - M5_SPAC/2, OTR_L/2 + M5_SPAC/2])
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translate([mx, OTR_W/2, -EPS]) {
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// Clearance bore through full floor
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cylinder(d=M5_D, h=FLOOR_T + 2*EPS);
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// BHCS head pocket from bottom face
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cylinder(d=M5_HEAD_D, h=M5_HEAD_H + EPS);
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}
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// ── Snap-arm ledge slot — Y− arm (hollow out to thin arm) ──
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// Arm is SNAP_T thick; cut away material behind arm
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translate([OTR_L/2 - SNAP_L/2 - EPS, EPS, OTR_H - SNAP_H])
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cube([SNAP_L + 2*EPS, WALL_T - SNAP_T - EPS, SNAP_H + EPS]);
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// ── Snap-arm ledge slot — Y+ arm ──────────────────────
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translate([OTR_L/2 - SNAP_L/2 - EPS, OTR_W - WALL_T + SNAP_T, OTR_H - SNAP_H])
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cube([SNAP_L + 2*EPS, WALL_T - SNAP_T - EPS, SNAP_H + EPS]);
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// ── Snap-arm inward ledge notch (entry chamfer removed) ─
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// Chamfer top of snap arm so PCB slides in easily
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// Y− arm: chamfer on upper-inner edge → 45° wedge on +Y/+Z corner
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translate([OTR_L/2 - SNAP_L/2 - EPS,
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WALL_T - SNAP_T - EPS,
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OTR_H - SNAP_IN])
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rotate([0, 0, 0])
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rotate([45, 0, 0])
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cube([SNAP_L + 2*EPS, SNAP_IN * 1.5, SNAP_IN * 1.5]);
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// Y+ arm: chamfer on upper-inner edge
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translate([OTR_L/2 - SNAP_L/2 - EPS,
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OTR_W - WALL_T + SNAP_T - SNAP_IN * 1.5 + EPS,
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OTR_H - SNAP_IN])
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rotate([45, 0, 0])
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cube([SNAP_L + 2*EPS, SNAP_IN * 1.5, SNAP_IN * 1.5]);
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// ── Snap ledge cutout on Y− arm inner tip ─────────────
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// Creates inward nub: remove top portion of arm inner tip
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// leaving bottom SNAP_IN height as the retaining ledge
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translate([OTR_L/2 - SNAP_L/2 - EPS,
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WALL_T - SNAP_T - EPS,
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PCB_Z0 + PCB_T + SNAP_IN])
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cube([SNAP_L + 2*EPS, SNAP_T + 2*EPS,
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OTR_H - (PCB_Z0 + PCB_T + SNAP_IN) + EPS]);
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// ── Snap ledge cutout on Y+ arm inner tip ─────────────
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translate([OTR_L/2 - SNAP_L/2 - EPS,
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OTR_W - WALL_T - EPS,
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PCB_Z0 + PCB_T + SNAP_IN])
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cube([SNAP_L + 2*EPS, SNAP_T + 2*EPS,
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OTR_H - (PCB_Z0 + PCB_T + SNAP_IN) + EPS]);
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// ── Zip-tie slots through strain relief bosses ─────────
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for (sy = [SR_Y1, SR_Y2])
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translate([SR_X, sy,
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SR_BOSS_H/2 - SR_SLOT_T/2])
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rotate([0, 90, 0])
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cube([SR_SLOT_T, SR_SLOT_W,
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SR_BOSS_OD + 2*EPS],
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center=true);
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// ── Weight relief pocket in floor (underside) ─────────
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translate([WALL_T + 8, WALL_T + 3, -EPS])
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cube([OTR_L - 2*WALL_T - 16, OTR_W - 2*WALL_T - 6,
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FLOOR_T - 1.5 + EPS]);
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}
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}
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// ── Assembly preview ─────────────────────────────────────────
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if (RENDER == "assembly") {
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color("DimGray", 0.93) canable_mount();
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// Phantom PCB
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color("MidnightBlue", 0.35)
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translate([PCB_X0, PCB_Y0, PCB_Z0])
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cube([PCB_L, PCB_W, PCB_T]);
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// Phantom component block (top of PCB)
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color("DarkSlateGray", 0.25)
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translate([PCB_X0, PCB_Y0, PCB_Z0 + PCB_T])
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cube([PCB_L, PCB_W, COMP_H]);
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// USB-C port highlight
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color("Gold", 0.8)
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translate([-1,
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PCB_Y0 + PCB_W/2 - USBC_W/2,
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PCB_Z0 + USBC_Z0])
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cube([WALL_T + 2, USBC_W, USBC_H]);
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// Terminal block highlight
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color("Tomato", 0.7)
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translate([OTR_L - WALL_T - 1,
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PCB_Y0 + PCB_W/2 - TERM_W/2,
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PCB_Z0 + TERM_Z0])
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cube([WALL_T + 2, TERM_W, TERM_H]);
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// LED zone highlight
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color("LimeGreen", 0.9)
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translate([PCB_X0 + LED_X_CTR - LED_WIN_W/2,
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OTR_W - WALL_T - 0.5,
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OTR_H - LED_WIN_H + 1])
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cube([LED_WIN_W, 1, LED_WIN_H - 2]);
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} else {
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canable_mount();
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}
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