weeek5 ftt111 copy

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School

Victor Valley College *

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2110

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Mechanical Engineering

Date

Feb 20, 2024

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Name: MOISES JUAREZ Course Number:FTT 111 01/03/2024 FTT 111 WEEK 5 TROUBLESHOOTING SCENARIOS Purpose: This assignment is designed to help you contextualize the overarching concepts discussed in the course text by cross- referencing them to examples of existing firearms. As you progress through the assignment, you’ll also progress through the thought- process of diagnosing and repairing malfunctions, as well as predicting the need for certain preventative maintenance. Troubleshooting is a process of asking or investigating, and answering, a series of increasingly detailed questions to arrive at the cause of a malfunction. This worksheet will “walk you through” the investigation required to troubleshoot a firearm. As you move on to more advanced concepts in later weeks, you will begin generating and predicting the questions you need to answer to diagnose a malfunction. Instructions: Read each situational description below and answer the questions in the space provided. Many of the prompts will buildon the previous ones, so please do not read ahead on this assignment. Answer one part of the assignment at a time, before reviewing the subsequent prompts. In Part 1, you’ll answer several questions to demonstrate declarative knowledge of key principles related to troubleshooting revolvers as well as firearms in general. This section will be critical to your ability to complete future assignments in this course, so take your time and thoroughly research and study the answers. In Parts 2 – 3, read each situation and answer the questions in the space provided. Many of the prompts will build on the previous ones,

so please do not read ahead on this assignment. Answer one part of the assignment at a time, before reviewing the subsequent prompts. Part 1. Please answer the following questions. What is the first thing you must know before attempting to disassemble or inspect a firearm? Before attempting to disassemble or inspect a firearm, it is crucial to prioritize safety and adhere to proper firearm handling procedures. This includes ensuring that the firearm is unloaded, removing the magazine (if applicable), and visually inspecting the chamber to verify that it is empty. Additionally, familiarize yourself with the specific make and model of the firearm, as different firearms have varying disassembly procedures. 2. In a straight blowback system, when does the bolt/slide begin reacting to the pressure created by the ignitedcartridge and what does this teach us about the importance of timing? I n a straight blowback system, the bolt/slide begins reacting to the pressure created by the ignited cartridge as soon as the bullet starts moving down the barrel. This early reaction to pressure highlights the significance of timing in this system. The timing must be precise to ensure that the bolt/slide remains closed for the appropriate duration, allowing the bullet to exit the barrel and pressure to drop to a safe level before the bolt/slide opens. 3. Explain how the rollers in the roller-delayed blowback system delay the opening of the action. The rollers in the roller-delayed blowback system play a crucial role in delaying the opening of the action. When the cartridge is fired, the pressure pushes the bolt/slide rearward. However, the rollers, which are initially locked in the barrel, resist this rearward movement. As the pressure drops, the rollers move outward due to their tapered shape, finally unlocking the bolt/slide and allowing it to cycle. 4. Identify one modern firearm that uses the gas-delayed blowback system and explain how the gas is used to delay the system.

One example of a modern firearm that utilizes the gas-delayed blowback system is the HK P7 pistol. In this system, gas is tapped from the barrel and directed into a gas piston. The gas piston then pushes against a piston sleeve, which in turn delays the opening of the action. By controlling the timing of the action, this system enhances reliability and mitigates the felt recoil. 5. Levers are usually used to create a mechanical advantage. How do the levers in the lever-delayed blowback system do just the opposite? the lever-delayed blowback system, the levers do not create a mechanical advantage; instead, they work in the opposite manner by introducing resistance. These levers, typically located beneath the barrel, delay the opening of the action by resisting the rearward movement of the bolt/slide. This delay allows pressure to drop to a safe level before the action cycles. 6. At what point in a blowback system is the firearm considered “locked”? In a blowback system, the firearm is considered "locked" when the bolt/slide remains closed, preventing the cartridge case from being extracted from the chamber and ensuring that pressure is contained within the barrel until it reaches a safe level. The bolt/slide locking mechanism, whether it be through various designs such as rollers, levers, or gas pressure, plays a critical role in achieving this locked position. 7. Is it always true that blowback systems are reserved for low-pressured cartridges? If not, what is an example of a firearm that is chambered for a high-pressure cartridge and uses the blowback system? While blowback systems are commonly associated with low-pressured cartridges, there are exceptions where they are utilized with high- pressure cartridges. One example is the FN Browning High Power pistol, chambered in 9mm Parabellum, which utilizes a modified blowback system. Through careful engineering and design considerations, such firearms are able to safely manage the higher pressures associated with high-powered cartridges while still employing the blowback operating principle. Part 2. Customer brings you a Browning Buck Mark that is experiencing a failure to extract. He says he has only tried one type of ammunition since purchasing the pistol.

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Sergiy Trushel [CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0) ] How would you make this firearm safe to begin working on? To ensure the safety of both myself and the firearm, the first step I would take is to visually inspect the Browning Buck Mark, ensuring that it is unloaded. I would remove the magazine and visually and physically confirm that the chamber is empty. Additionally, I would engage the safety mechanism. 1. If the sear in this firearm needed replacement, where might you find a replacement and how much would this component cost? Cost $14.99 available at midwayusa.com. Please include your destination URL as part of your answer. (NOTE: Please use the text “ Shooter’s Bible Guide to Firearms Assembly, Disassembly, and Cleaning” and online resources such as Numrich Gun Parts, Brownell’s, Midway USA, etc. to find this information.) https://www.midwayusa.com/product/1004214357 http://www.browning.com/products/firearms/pistols/buck-mark- pistols.html 2. Based on the model of pistol, is it ☐straight blowback 3. What is “short stroking”, how is it caused, and what steps within the Cycle of Operations can it negatively affect in this firearm? "Short stroking" refers to a malfunction where the slide or bolt fails to travel the full distance required for proper operation. This can be caused by a variety of factors, such as insufficient recoil energy, a weak or worn recoil spring, or excessive friction within the firearm's moving parts. In the cycle of operations, short stroking can negatively affect multiple stages. It can lead to failure to fully extract and eject spent casings, resulting in stovepipes or failure to feed the next round properly. 4. If, during the test fire, you discover that the pistol experiences erratic extraction with a variety of ammunition, what part(s) would you most suspect are causing this malfunction? If erratic extraction occurs with a variety of ammunition

during the test fire, the parts that would be most suspect in causing this malfunction are the extractor and the extractor spring. These components play a crucial role in the proper extraction and ejection of spent casings. If they are worn, damaged, or improperly installed, it can lead to unpredictable extraction patterns. 5. Based on the component(s) that you identified above as suspect, how might you best remedy this malfunction?Are there any mastery skills you would need to possess prior to performing such work on the firearm? To remedy this malfunction, the best course of action would be to replace the suspect components, namely the extractor and the extractor spring. It is important to ensure that the replacement parts are of high- quality and compatible with the Browning Buck Mark model in question. Additionally, meticulous attention to detail during the installation process is vital to ensure proper functionality. Prior to performing such work on the firearm, it is essential to possess a mastery of firearm disassembly and reassembly techniques, as well as a thorough understanding of the specific model being worked on. Familiarity with the Browning Buck Mark's internal mechanisms, including the cycle of operations, is a prerequisite to effectively diagnosing and addressing malfunctions. 6. What test(s) might you perform after making such a repair and what do you hope to learn by doing this? After making the necessary repair, it is advisable to conduct several tests to verify the effectiveness of the remedy. This may include test firing the firearm with a variety of ammunition to ensure consistent and proper extraction. Additionally, a thorough inspection of the spent casings and their ejection patterns can provide valuable insights into the success of the repair. The goal of these tests is to ensure that the firearm functions reliably, with consistent and proper extraction, thereby restoring its safe and efficient operation. Part 3. Customer brings you a the following rimfire carbine. He says it’s worked reliably for years, but recently it “doesn’t seem to want to kick out the brass”. He says it ejects some of the time, but not always, and the problem is getting worse. When questioned, he says he’s not sure if there’s a particular type of ammo this happens with, but he doesn’t think so.

1. How would you make this firearm safe to begin working on? T o ensure the safety of the firearm and facilitate the necessary repairs, the first step would be to ensure the weapon is unloaded. Perform a thorough check to confirm that there are no live rounds in the chamber or the magazine. This can be done by visually inspecting the chamber and magazine well and manually cycling the action to ensure it is clear. 2. What model is this rifle? ☐ Ruger 10/22. 3. If the ejector in this firearm needed replacement, where might you find a replacement and how much would this component cost? Cost: $3.99 available at midwayusa.com. Please include your destination URL as part of your answer. https://www.midwayusa.com/product/1005107699 4. If, during the test fire, you discover that the problem the customer complained of persists with multiple types of ammunition, what other parts do you need to inspect? In the event that the issue persists with multiple types of ammunition during the test fire, it would be prudent to inspect other key components. The most likely culprits could be the extractor, extractor spring, and the bolt itself. These parts work in conjunction to properly extract and eject spent casings, so any issues with these components could contribute to the malfunction. 5. Assuming your answer to question four were the cause of the malfunction, in a short customer summary, describe the type of failure, what components caused the malfunction, the components you removed/replaced, and the tests that were performed to verify operation: Upon further investigation, it was determined that the malfunction was caused by a worn-out ejector. The ejector was not providing sufficient pressure to kick out the brass consistently, resulting in intermittent ejection. To rectify this, the worn-out ejector was removed and replaced with a new one, ensuring proper ejection of spent casings. Additionally, a thorough inspection of the extractor, extractor spring, and bolt was conducted to ensure their functionality and integrity.

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To verify the proper operation of the firearm, a series of tests were performed. This included test firing the rifle with various types of ammunition to ensure consistent and reliable ejection. The firearm was also inspected for any signs of abnormal wear or damage. Finally, a complete function check was conducted to ensure all components were working harmoniously. In summary, the failure experienced by the customer was due to a worn-out ejector. This component was promptly replaced to restore proper ejection functionality. Additionally, other key components such as the extractor, extractor spring, and bolt were inspected to ensure their optimal performance. Rigorous testing and a thorough function check were carried out to guarantee the rifle's reliable operation