Anvil 022: Pederson Device recovery

Published on April 2, 2021
Duration: 25:01

This video details the complex restoration of a malfunctioning Pedersen Device. Key insights include diagnosing mechanical interference caused by incorrect replacement parts, specifically a spring that was too long and a mis-machined collar. The process involved precise engineering calculations, manual machining of a new collar, and successful live-fire testing to validate the repairs on a Springfield M1903 Mark I rifle.

Quick Summary

A Pedersen Device failed due to a replacement spring being too long, causing 'coil bind' and battering a mis-machined collar. Precise measurements from Springfield Armory guided the machining of a new 0.302" OD collar, successfully restoring the device after live-fire testing.

Chapters

  1. 00:00Intro & Problem Diagnosis
  2. 00:49Disassembly & Historical Context
  3. 03:54Engineering & Whiteboard Analysis
  4. 07:30Machining the Replacement Collar
  5. 11:57Live Fire Testing & Validation

Frequently Asked Questions

What caused the Pedersen Device to malfunction in the video?

The Pedersen Device malfunctioned due to incorrect replacement parts. A spring was too long, causing 'coil bind' and excessive force on a custom collar, which was also machined with incorrect dimensions, leading to deformation and mechanical interference.

How was the replacement collar for the Pedersen Device machined?

A new collar was precisely machined on a lathe to specific dimensions: 0.302" outer diameter, fitting a 0.304" bore, with a maximum overall length of 0.300" and a 0.050" skirt length for proper spring seating.

What historical information was used in the Pedersen Device restoration?

Measurements from a pristine original Pedersen Device, provided by Mr. McKenzie at the Springfield Armory National Historical Site, were used to confirm incorrect dimensions in the faulty replacement parts and guide the fabrication of new ones.

What caliber ammunition was used for testing the restored Pedersen Device?

The restored Pedersen Device was tested using custom-manufactured .30-18 Pedersen handloads. This caliber is specific to the Pedersen Device designed to convert the Springfield M1903 rifle.

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