Tube Magazine Fed Bolt-Action Rifle—Cal .30-30 Winchester. Student: Dallas CLAYTON DAIGLE Concentration: Mechanical Class: ET 494 fall 2015 Instructor: dr. cris koutsougeras Advisor: dr. junkun ma.

Introduction There have been few developments around the .30-30 in many years. Most .30-30 Firearms are lever action. Lever actions inherently have exposed hammers and several moving parts. Lever actions can be difficult for inexperienced shooters. Especially older models.

Introduction—Contd. A Bolt action would eliminate the need for an exposed hammer by having firing components contained within the bolt. This makes them inherently safer than their lever operated counterparts. The .30-30 Win has a pronounced rim, which often catches on the followers of traditional box magazines. The rim and the blunt nose of the round are the reasons behind tubular magazines being ideal for the .30-30 Win.

Objective(s) Create an safer/simpler design for the .30-30 Winchester. This design utilizes a bolt action rather than a lever action. It retains the tubular magazine running under the barrel. The chief idea/objective is to retain the pros of both types of actions while eliminating their respective cons.

Design Challenges Action/Mechanism must be designed to reliably and safely complete the firing  ejecting  feeding  reloading cycle repeatedly until magazine is empty. The chamber/barrel/headspace needs to be designed to handle a variable working pressure with a maximum of 42,000psi (290Mpa). The whole system should be light and compact, with internals that are simple and reliable, and made of specifically selected materials. It needs to be easily disassembled for cleaning, and need little maintenance to function smoothly.

The Mechanism

Exploded Mech. Assembly

Basic Mech. Animation

Breakdown of Designed Components and Methods. For this project, many custom components had to be designed to meet the known parameters. The following slides/sections will break down and discuss these components in detail. Design, dimensions, function(purpose), and modeling will be discussed.

The Carrier.

The Barrel The initial plan was to design a new barrel. One that was harmonically stable for maximum accuracy, was of the appropriate thickness to deal with the developed pressure/stress, and had the ideal rifling ratio. After doing some of the calculations, it was established that the standard was already very close to this ideal case, so there was no need for a custom barrel. For redundancy and modeling purposes, I went ahead with the hand calculations, but only used the ones for the chamber/headspace.

Modeling the Barrel/Headspace.

Magazine Retention Device. Regulates rounds leaving the magazine. In this case, limiting to one per loading cycle. Spring assisted. Functions as a simple lever.

Magazine Assembly.

The Bolt.

Bolt Analysis

Receiver/Housing

Receiver Analysis.

Deliverables Continue and complete a finished mechanism design. (Complete) Build detailed 3D model prototype in SolidWorks. (Complete) Analysis of load bearing parts in COMSOL. (Complete) Re-evaluated/Continued Cost/Price Estimation. (Complete) 3D printed plastic display model of system. (Delayed)

Questions? THANK YOU—THE END.