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BRINGUP: coolant flow verification done - heater trick characterized and live-verified

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ScottW514
2026-08-02 17:45:34 -04:00
parent 6f53e628f3
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@@ -232,8 +232,15 @@ hardware I/O — host testing).
it to a hard fire gate). Verified via tach readbacks: air tach it to a hard fire gate). Verified via tach readbacks: air tach
period 4439→699 under M8, exhaust stopped→full, intakes ~3×, period 4439→699 under M8, exhaust stopped→full, intakes ~3×,
cooldown hold, clean return to idle; coolant temp visibly cooldown hold, clean return to idle; coolant temp visibly
dropped during the blast. TEC/heater control remain for the dropped during the blast. **Coolant flow verification also DONE**
thermal part of the laser milestone. (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 - **Interlock readback semantics cross-check: OPEN** (see
factory-laser-safety-readbacks notes). factory-laser-safety-readbacks notes).
3. **Homing (design decided 2026-08-02)**: the factory machine has NO 3. **Homing (design decided 2026-08-02)**: the factory machine has NO