Ra Workshop 36 Top Crack

The unit is subject to high-frequency oscillation during standard operation. Vibration analysis shows a resonance frequency harmonizing with the natural frequency of the top plate assembly. Over time, this cyclic loading initiates fatigue cracks at stress concentration points—specifically near the fillet radii where the material thickness changes abruptly.

Do not exceed a 20°C difference between the tool and the workpiece. If you heat a case back to 100°C, the RA 36 must be at room temperature (20°C). Use a thermal barrier plate (0.5mm brass shim) between the hot case and the top beam. ra workshop 36 top crack

Date: October 26, 2023 Subject: Structural Failure Analysis / Mitigation Strategies for RA Workshop 36 Top Crack Severity: High (Structural Integrity / Serviceability) The unit is subject to high-frequency oscillation during

This report details the investigation into the "Top Crack" defect identified in the RA Workshop 36 production line. The defect manifests as structural fracturing along the upper structural member of the assembly. Preliminary findings suggest the failure is likely due to a combination of thermal stress and potential tensile overload during the curing/clamping phase. Immediate containment actions have been taken, and root cause analysis is underway. Do not exceed a 20°C difference between the

Objective: Stabilize and cosmetically restore a longitudinal top crack on an acoustic instrument (spruce/cedar top) without compromising resonance or structural integrity.

Subject: Top Crack Defect Analysis – RA Workshop 36 Date: October 26, 2023 Report ID: RA-36-TC-2023 Status: Open / Investigation Phase