sl-mechanical
0daac970c3
chassis/sim7600x_mount.scad Platform bracket for Waveshare SIM7600X-H 4G HAT (65×56 mm, RPi HAT M2.5 pattern 58×49 mm). Standoffs height = HAT underside component clearance + 4 mm. Three walls (X−, X+, Y+); Y− edge fully open for SIM card tray access without disassembly. Floor-plate notch wider than SIM slot so card inserts/ejects with board in situ. USB port notch same open edge. u.FL pigtail exit slot in Y+ wall. 4× M3 flat-head countersunk holes for base plate bolt-down. RENDER: bracket / assembly / bracket_2d (DXF for base plate layout). chassis/antenna_mount.scad Two bracket types on shared 25 mm stem split-collar (M4 bolts, set screw height lock, cable-tie grooves on rear half): lte_bracket() — arm with 2× SMA bulkhead holes (6.6 mm clearance, hex-nut capture on underside). u.FL pigtail relief grooves on arm underside. Antennas point skyward. Recommended: 500–600 mm stem. gnss_platform() — upward-facing tray (≤40×40 mm patch antenna), 4-sided retention lip, central GNSS coax slot, optional M2 bolt-down holes at 30×30 mm. Mount as high as practical for clear sky view: 750–800 mm stem height. Recommended: active 35×35 mm patch antenna. RENDER "full_stem" shows both at 80 mm spacing on stem stub. Individual RENDER modes for each printable piece. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
170 lines
7.2 KiB
OpenSCAD
170 lines
7.2 KiB
OpenSCAD
// ============================================================
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// sim7600x_mount.scad — Waveshare SIM7600X 4G HAT Bracket
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// Rev A 2026-03-01 sl-mechanical
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// ============================================================
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// Mounts the SIM7600X HAT near the Jetson Orin on the base plate.
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//
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// PCB: 65 × 56 mm, 4× M2.5 mounting holes (RPi HAT std pattern).
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//
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// SIM card access without disassembly:
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// The Y− edge of the bracket platform is fully open — a notch
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// in the floor plate is wider than the SIM tray so the card
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// inserts / ejects with the board fully installed.
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//
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// Base plate attachment: 4× M3 flat-head countersunk holes at
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// bracket corners. Drill M3 clearance holes in base plate and
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// use M3 nyloc nuts underneath, or use captured M3 T-nuts.
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//
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// ⚠ VERIFY WITH CALIPERS BEFORE PRINTING:
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// HAT_L, HAT_W PCB dimensions
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// HAT_HOLE_X, HAT_HOLE_Y M2.5 hole spacing
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// HAT_HOLE_OX, HAT_HOLE_OY hole inset from PCB corners
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// SIM_X, SIM_W SIM slot centre & width on Y− edge
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// USB_X, USB_W, USB_H USB port on Y− edge
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//
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// RENDER options:
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// "assembly" bracket + phantom PCB (default)
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// "bracket" print-ready bracket
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// "bracket_2d" floor projection → DXF for base-plate layout
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// ============================================================
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RENDER = "assembly";
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// ── ⚠ Verify before printing ─────────────────────────────────
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// Waveshare SIM7600X-H 4G HAT
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HAT_L = 65.0; // PCB length (X)
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HAT_W = 56.0; // PCB width (Y) — SIM slot on Y=0 edge
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HAT_H_BELOW = 3.0; // tallest component on PCB underside (verify)
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// RPi HAT standard M2.5 hole pattern
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HAT_HOLE_X = 58.0; // X span between hole pairs
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HAT_HOLE_Y = 49.0; // Y span between hole pairs
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HAT_HOLE_OX = 3.5; // hole inset from X− edge of PCB
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HAT_HOLE_OY = 3.5; // hole inset from Y− edge of PCB
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M25_D = 2.7; // M2.5 clearance (loose, for alignment)
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M25_OD = 5.0; // standoff post outer diameter
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// SIM card slot (Y− edge, verify position from left/X− corner)
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SIM_X = 42.0; // SIM slot centre from PCB X− edge
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SIM_W = 17.0; // SIM slot width
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SIM_H_NOTCH = 4.5; // notch height for tray travel + eject pin
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// USB Micro-B port (Y− edge, verify — may differ by HAT version)
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USB_X = 11.0; // USB port centre from PCB X− edge
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USB_W = 10.5; // USB port width
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USB_H = 7.0; // USB port height
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// u.FL pigtail exit slot (Y+ wall)
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UFL_SLOT_W = 12.0;
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UFL_SLOT_H = 5.0;
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// ── Bracket geometry ─────────────────────────────────────────
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STNDFF_H = HAT_H_BELOW + 4.0; // standoff height (clears underside)
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PLAT_T = 3.5; // floor plate thickness
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WALL_T = 2.5; // side wall thickness
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PAD_X = 5.0; // platform extends PAD_X beyond PCB on X± sides
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PAD_Y_PLUS = 8.0; // platform extends PAD_Y_PLUS beyond PCB on Y+ side
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// Y− side: open (no wall, no floor overhang) — SIM/USB access
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PLAT_L = HAT_L + 2 * PAD_X;
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PLAT_W = HAT_W + PAD_Y_PLUS; // Y− edge flush with PCB Y=0
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// PCB sits with Y=0 edge flush with bracket Y=0 face
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PCB_X0 = PAD_X; // X offset of PCB within bracket
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// M3 base-plate mounting holes
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M3_D = 3.4;
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M3_CS_D = 6.2; // flat-head countersink diameter
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M3_CS_H = 3.0; // countersink depth (from bottom face)
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M3_INSET = 5.0; // hole inset from bracket corner
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// Side wall height (for cable containment)
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WALL_H = STNDFF_H + 4.0;
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$fn = 48;
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e = 0.01;
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// ─────────────────────────────────────────────────────────────
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module sim7600x_bracket() {
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difference() {
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union() {
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// ── Floor plate ──────────────────────────────────
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cube([PLAT_L, PLAT_W, PLAT_T]);
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// ── Side walls: X−, X+, Y+ only (Y− open) ───────
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translate([0, 0, 0])
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cube([WALL_T, PLAT_W, WALL_H]);
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translate([PLAT_L - WALL_T, 0, 0])
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cube([WALL_T, PLAT_W, WALL_H]);
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translate([0, PLAT_W - WALL_T, 0])
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cube([PLAT_L, WALL_T, WALL_H]);
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// ── M2.5 standoff posts (×4) ─────────────────────
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for (hx=[0, HAT_HOLE_X], hy=[0, HAT_HOLE_Y])
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translate([PCB_X0 + HAT_HOLE_OX + hx,
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HAT_HOLE_OY + hy,
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PLAT_T])
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cylinder(d=M25_OD, h=STNDFF_H);
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}
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// ── M2.5 clearance bores through standoffs ───────────
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for (hx=[0, HAT_HOLE_X], hy=[0, HAT_HOLE_Y])
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translate([PCB_X0 + HAT_HOLE_OX + hx,
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HAT_HOLE_OY + hy, -e])
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cylinder(d=M25_D, h=PLAT_T + STNDFF_H + e);
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// ── SIM card access notch (Y− face of floor) ─────────
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// Notch 4 mm wider than SIM slot each side
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translate([PCB_X0 + SIM_X - SIM_W/2 - 4, -e, -e])
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cube([SIM_W + 8, WALL_T + e, PLAT_T + SIM_H_NOTCH + e]);
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// ── USB port access notch (Y− face of X− wall) ───────
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translate([PCB_X0 + USB_X - USB_W/2, -e,
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PLAT_T + STNDFF_H/2 - USB_H/2])
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cube([USB_W, WALL_T + 2*e, USB_H]);
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// ── u.FL pigtail exit slot (Y+ wall, upper zone) ─────
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translate([PLAT_L/2 - UFL_SLOT_W/2,
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PLAT_W - WALL_T - e,
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PLAT_T + STNDFF_H - UFL_SLOT_H])
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cube([UFL_SLOT_W, WALL_T + 2*e, UFL_SLOT_H + e]);
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// ── M3 base-plate mounting holes (×4, countersunk) ───
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for (cx=[M3_INSET, PLAT_L - M3_INSET])
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for (cy=[M3_INSET, PLAT_W - M3_INSET]) {
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translate([cx, cy, -e])
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cylinder(d=M3_D, h=PLAT_T + 2*e);
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// Countersink from bottom face
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translate([cx, cy, -e])
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cylinder(d1=M3_CS_D, d2=M3_D,
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h=M3_CS_H + e);
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}
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// ── Cable relief notch in X+ wall ────────────────────
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translate([PLAT_L - WALL_T - e, PLAT_W * 0.35, PLAT_T + 2])
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cube([WALL_T + 2*e, 9, 5]);
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}
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}
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// ─────────────────────────────────────────────────────────────
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if (RENDER == "assembly") {
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color("DimGray", 0.92) sim7600x_bracket();
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// Phantom PCB
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color("ForestGreen", 0.3)
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translate([PCB_X0, 0, PLAT_T + STNDFF_H])
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cube([HAT_L, HAT_W, 1.6]);
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// SIM access marker (yellow arrow zone)
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color("Gold", 0.7)
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translate([PCB_X0 + SIM_X - 10, -8, 0])
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cube([20, 8, 2]);
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} else if (RENDER == "bracket") {
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sim7600x_bracket();
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} else if (RENDER == "bracket_2d") {
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projection(cut=true)
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translate([0, 0, -PLAT_T/2])
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sim7600x_bracket();
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}
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