Gunsmithing - How to Repair the Tumbler and Sear on an Axtell 1877 Sharps Rifle

Published on November 6, 2013
Duration: 8:09

This guide details the advanced gunsmithing process for repairing the tumbler and sear on an Axtell Model 1877 Sharps rifle, as demonstrated by Master Gunsmith Larry Potterfield. It covers diagnosing internal lock mechanism failures, fabricating replacement parts from scratch using milling and welding techniques, and performing essential case-hardening for durability. The methodical approach ensures the rifle's functionality is restored to its original specifications.

Quick Summary

Master Gunsmith Larry Potterfield demonstrates the advanced gunsmithing required to repair the tumbler and sear on an Axtell 1877 Sharps rifle. The process involves diagnosing internal lock failures, fabricating replacement parts using milling and TIG welding, and applying case hardening for durability, as original parts are often unavailable.

Chapters

  1. 00:00Introduction to Axtell 1877 Sharps Rifle
  2. 00:56Problem Diagnosis: Hammer Not Engaging
  3. 01:10Lock Removal Procedure
  4. 01:44Identifying Broken Sear and Tumbler
  5. 02:07Lock Disassembly with Mainspring Vice
  6. 03:31Fabricating a New Sear with Milling Machine
  7. 04:37Repairing Tumbler with TIG Welding
  8. 05:14Filing and Shaping Tumbler Notch
  9. 06:21Final Sear Fitting and Verification
  10. 07:03Case Hardening the New Sear
  11. 07:34Reassembly and Final Testing

Frequently Asked Questions

What are the common failure points in the Axtell 1877 Sharps rifle lock mechanism?

The most common failure points identified are the sear nose and the half-cock notch in the tumbler. These can break due to insufficient clearance during firing, leading to the hammer not engaging properly in its cocked positions.

What tools are essential for repairing the tumbler and sear on an Axtell 1877 Sharps rifle?

Essential tools include a mainspring vice for safe disassembly, a milling machine for fabricating new parts, a TIG welder for building up damaged areas, and various files (diamond, screw slot) for precise shaping and contouring.

How is a new sear made for the Axtell 1877 Sharps rifle?

A new sear is fabricated from mild steel by drilling a pivot hole, scribing the profile, and shaping it with a milling machine. The sear nose is then milled to the correct angle and thickness before case hardening.

What is the purpose of case hardening in firearm repair?

Case hardening is a heat-treating process that hardens the surface of steel components, like the sear and tumbler, while keeping the core tough. This significantly improves wear resistance and durability, crucial for parts subjected to repeated stress.

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