From ea93a194a69d4840e695f0bb174a2b25c7e7ff27 Mon Sep 17 00:00:00 2001 From: ScottW514 Date: Sun, 2 Aug 2026 17:45:34 -0400 Subject: [PATCH] BRINGUP: coolant flow verification done - heater trick characterized and live-verified --- docs/BRINGUP.md | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/docs/BRINGUP.md b/docs/BRINGUP.md index 941a956..56afcf2 100644 --- a/docs/BRINGUP.md +++ b/docs/BRINGUP.md @@ -232,8 +232,15 @@ hardware I/O — host testing). it to a hard fire gate). Verified via tach readbacks: air tach period 4439→699 under M8, exhaust stopped→full, intakes ~3×, cooldown hold, clean return to idle; coolant temp visibly - dropped during the blast. TEC/heater control remain for the - thermal part of the laser milestone. + dropped during the blast. **Coolant flow verification also DONE** + (the factory heater trick: loop heater at 10 % between the two + water-temp sensors; measured on this machine — flow ΔT settles + +2.5..4.0 °C and never sustains >4.1, pump-stopped ΔT hits + +4.6..5.7 within 20 s; fault = ΔT>4.5 °C for 20 s, live-verified: + pump stopped → sender warning in 40 s → recovery re-arms). + Absolute ceiling 33 °C (job-header CMrx; heater adds ~1.5 °C to + the loop). TEC control remains for the thermal part of the laser + milestone; both warnings become hard fire gates there. - **Interlock readback semantics cross-check: OPEN** (see factory-laser-safety-readbacks notes). 3. **Homing (design decided 2026-08-02)**: the factory machine has NO