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feat(case): relieve the bracket and foam for the FPC U-turn

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The flex leaves the glass's back plane on the left and must fold ~180 deg
to dive into the cavity toward the breakout. A safe bend radius makes
that loop ~4 mm deep, too deep for the 1 mm foam gap, so it fouled the
rigid bracket. Open the bracket's left frame member and the foam's left
border over the FPC span, aligned with the body's existing slot, to give
the U-turn room. Re-adds the relief dropped in c4320e2, correctly scoped.
This commit is contained in:
Julien Calixte
2026-07-11 09:44:43 +02:00
parent 32e9623411
commit 208c929650
3 changed files with 21 additions and 10 deletions
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29
hardware/case/typoena-case.scad
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@@ -25,7 +25,7 @@
// ============================================================================
show = "assembled";
$fn = 48;
$fn = 20;
// ---- body envelope --------------------------------------------------------
W = 176; // width (X) — screen 150.9 + bezel + walls
@@ -230,14 +230,19 @@ module case_body() {
// ===========================================================================
module bracket() {
ow = P_w + 18; oh = P_h + 18;
// Solid frame — no FPC notch on purpose. The flex U-turns off the glass's
// left edge and returns INBOARD through the ~1 mm foam gap ABOVE this bracket
// (the bracket starts 1 mm deeper), then drops into the cavity through the
// open aperture to the breakout — it never crosses the bracket plane. The
// only FPC relief lives in the body's left pocket wall (see screen_cuts()).
// FPC U-turn clearance: a gap in the LEFT frame member. The flex leaves the
// glass's back plane and folds ~180° to dive into the cavity toward the
// breakout; a safe bend radius (~1.5-2 mm) makes that loop ~4 mm deep, too
// deep for the 1 mm foam gap, so it fouls this rigid frame unless relieved
// here. Lines up with the body's FPC slot (screen_cuts) and the foam relief.
difference() {
linear_extrude(bracket_t)
difference() { rrect(ow, oh, 4); rrect(A_ap_w+2, A_ap_h+2, 2); }
difference() {
rrect(ow, oh, 4);
rrect(A_ap_w+2, A_ap_h+2, 2);
translate([-(ow + A_ap_w+2)/4, 0])
square([(ow - (A_ap_w+2))/2 + 4, fpc_w], center=true);
}
for (bx=[-(P_w/2+5), P_w/2+5], by=[-(P_h/2+5), P_h/2+5])
translate([bx, by, -1]) cylinder(h=bracket_t+2, r=1.45); // M2 clear
}
@@ -283,10 +288,16 @@ module placed_bracket() {
-lip_t-G_t-foam_t-bracket_t])
color(C_bracket) bracket();
}
// foam gasket (non-adhesive) — a border frame between glass and bracket
// foam gasket (non-adhesive) — a border frame between glass and bracket, with
// its LEFT border opened over the FPC span so the U-turning flex isn't clamped
module foam() {
linear_extrude(foam_t)
difference() { rrect(P_w+4, P_h+4, 3); rrect(A_ap_w, A_ap_h, 2); }
difference() {
rrect(P_w+4, P_h+4, 3);
rrect(A_ap_w, A_ap_h, 2);
translate([-((P_w+4) + A_ap_w)/4, 0])
square([((P_w+4) - A_ap_w)/2 + 4, fpc_w], center=true);
}
}
module placed_foam() {
on_deck() translate([screen_off, screen_cy+screen_off, -lip_t-G_t-foam_t])