Gunsmithing - How to Cut Sight Dovetails Presented by Larry Potterfield of MidwayUSA

Published on December 6, 2013
Duration: 2:33

Larry Potterfield of MidwayUSA provides an expert guide on cutting sight dovetails into a firearm barrel using a milling machine. The process involves precise setup, marking with layout fluid, milling to a specific depth (0.090 inches), and hand-fitting the sight. This technique is crucial for securely mounting iron sights on custom or repaired firearms.

Quick Summary

Learn expert gunsmithing techniques for cutting sight dovetails using a milling machine. Larry Potterfield demonstrates securing the barrel, marking locations, milling to a precise 0.090-inch depth, and hand-fitting the sight for a secure installation. This process is essential for mounting iron sights accurately.

Chapters

  1. 00:00Introduction to Dovetails
  2. 00:18Equipment and Project Overview
  3. 00:34Setup and Marking
  4. 00:44Milling the Rear Dovetail
  5. 01:20Milling the Front Dovetail
  6. 01:48Hand-Fitting and Installation

Frequently Asked Questions

What is the recommended depth for cutting a sight dovetail?

The recommended depth for cutting a sight dovetail, as demonstrated by Larry Potterfield, is 0.090 inches (90 thousandths of an inch). This depth ensures a secure fit for the sight without compromising the barrel's structural integrity.

Why is a milling machine preferred over a drill press for cutting dovetails?

A milling machine is preferred because it is designed for heavy cuts in steel and offers greater precision and control compared to a drill press, which is not intended for the lateral forces involved in cutting dovetails.

How are round or tapered barrels secured for milling dovetails?

Round or tapered barrels are secured using V-blocks in the milling vise. Brass shims are often used in conjunction with the V-blocks to compensate for the barrel's taper and ensure a stable, secure hold during the milling operation.

What is the purpose of hand-filing a dovetail after milling?

After milling, the dovetail is intentionally cut slightly undersized. Hand-filing with a specific tool, like a triangular file with a 'safe' side, allows for precise adjustment to achieve a perfect, snug fit for the sight, preventing it from becoming loose.

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