113 lines
4.9 KiB
Plaintext
113 lines
4.9 KiB
Plaintext
---
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title: Human powered shredder
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slug: human-powered-shredder
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description: The machines are open source, allowing adaptation to your needs. If you'd prefer not to use a motor, alternative manual methods are available to power the shredder.
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tags: ["hack","shredder","research"]
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category: Machines
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difficulty: Medium
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time: < 1 week
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location: Brighton and Hove, United Kingdom of Great Britain and Northern Ireland (the)
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---
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import { Image } from 'astro:assets'
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# Human powered shredder
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<Image src={import('./Unaatitledd2-18391b5b817.jpg')} alt="Human powered shredder" />
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The machines are open source, allowing adaptation to your needs. If you'd prefer not to use a motor, alternative manual methods are available to power the shredder.
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User Location: Brighton and Hove, United Kingdom of Great Britain and Northern Ireland (the)
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## Steps
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### Step 1: Disclaimer
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This guide aims to inspire you in machine design.
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We are not liable for any design or operational issues with your machine. Please consult a professional when necessary.
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Adhere to all safety guidelines and practices when constructing machinery and using tools.
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Proceed with designing, building, and modifying this machine at your own risk.
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Note that the images and 3D models included are examples and may not suit your specific needs.
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<Image src={import('./Untitled-2.jpg')} alt="Untitled-2.jpg" />
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### Step 2: User Requirement Specifications
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### Understanding User Requirements
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User Requirements Specifications (URS) are essential for defining the characteristics of a project before construction. Key considerations include:
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- **Power Source**: Decide between a motor (single-phase or three-phase), manual options (hand-crank or pedal), or alternative energy sources such as wind or hydro.
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- **Usage Frequency**: For infrequent use, a simple and inexpensive design may suffice, such as manual power. For frequent use, a more robust power source is advisable.
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- **Material Availability**: Utilize available resources, such as a salvaged motor or an unused exercise bike, to reduce effort and costs.
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- **Skill and Process Availability**: If you have welding skills, standard machine designs are feasible. Otherwise, consider outsourcing or redesigning, which could increase costs.
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- **Off-Grid Use**: If electricity is inaccessible, consider a non-electric design.
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This structured approach ensures that decisions made at the outset guide the project effectively.
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<Image src={import('./Untitled32.jpg')} alt="Untitled32.jpg" />
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### Step 3: To weld or not to weld
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If welding steel is not an option, consider alternative methods for constructing the frame:
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- Steel sections can be joined with nuts and bolts, eliminating welding but requiring drilled holes.
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- Aluminum T-slot extrusions are also suitable; they are easy to assemble and modify.
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- Exercise caution if using wood as a structural element due to potential exposure to significant forces that wood might not withstand.
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For the shredder, modifications can be made to avoid welding, but this requires precision engineering with accurately measured and squared holes and dimensions.
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<Image src={import('./Untitleda2.jpg')} alt="Untitleda2.jpg" />
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<Image src={import('./Untitled-12.jpg')} alt="Untitled-12.jpg" />
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<Image src={import('./Untitledd2.jpg')} alt="Untitledd2.jpg" />
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### Step 4: Reduce the speed, increase the torque
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To enhance shredder performance, it is crucial to achieve high torque, enabling the shredding of plastics up to 1-3 millimeters (0.04-0.12 inches) with ease. The strategy involves reducing machine speed to increase torque. Power can be transmitted through various methods:
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- **Gearbox**: Compact units can reduce speed by ratios up to 100:1. They typically contain a worm gear, preventing back-driving during clogs.
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- **Pulleys and Belts**: These allow power transmission and can slip, which is beneficial if there's a clog.
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- **Gears**
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- **Chains and Sprockets**
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<Image src={import('./Untitl3-2.jpg')} alt="Untitl3-2.jpg" />
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### Step 5: I believe I can FLYWHEEL
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Flywheels provide inertia to machines, allowing them to continue moving with minimal input. Place the flywheel on the faster side of your mechanism for optimal performance.
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The efficiency of a flywheel is determined by its weight, shape, and speed. A disc or wheel shape generally works best, and distributing weight away from the axis enhances performance. Higher speeds improve the ability to maintain rotation with minimal effort.
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Consider an exercise bike: the front flywheel keeps spinning even when pedaling stops.
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<Image src={import('./Untitledad2.jpg')} alt="Untitledad2.jpg" />
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<Image src={import('./Untitleadd2.jpg')} alt="Untitleadd2.jpg" />
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### Step 6: Safety first! (and last)
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Ensure the installation of guards and covers to prevent fingers from contacting any moving parts, thereby minimizing the risk of injury.
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<Image src={import('./Unaatitledd2.jpg')} alt="Unaatitledd2.jpg" />
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<Image src={import('./Untitleddaa2.jpg')} alt="Untitleddaa2.jpg" />
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