Rath Trombone Repair

Conn 88H Bell Restoration: Precision Mandrel Reshaping and Mechanical Analysis

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The Conn 88H trombone arrived with a significant structural deformation in the rose brass bell section, specifically located prior to the flare. A high-impact collision had compressed the wall thickness and compromised the internal geometry. Such physical trauma introduces resistance to the air column and disrupts the standing wave essential for acoustic projection. In our […]

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Trombone Slide Regulation and Mechanical Repair | Brass Toff

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The diagnostic assessment of this Rath trombone revealed significant internal obstruction caused by desiccant lubricant residue and calcium deposits. These contaminants increase the coefficient of friction between the inner slide stockings and the outer slide walls. Clients from Runcorn frequently present instruments where the mechanical action has degraded due to the accumulation of particulate matter

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Precision Diagnostics: The Physics of Trombone Slide Regulation

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When resistance is felt in a brass instrument, specifically the slide of a trombone, the issue is often a breach of critical mechanical tolerance. A smoothly functioning slide requires a near-zero coefficient of friction, maintained by a thin layer of lubrication between the inner nickel stocking and the outer brass casing. Physical debrismineral deposits from

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Conn 88H Restoration: Analyzing Deformation and Tolerances in Vintage Brass Repair

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The assessment of this Conn 88H trombone revealed severe plastic deformation across the bell flare and slide crook. Initial mechanical integrity checks indicated that internal bore alignment was compromised by localized impacts. Before addressing the geometry, standard procedure involved ultrasonic cleaning to eliminate internal calcification deposits and organic residue. These deposits, acting as internal friction

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