Our Group Assignment

Documented my individual contribution for Mechanical Design, Machine Design

My Role is Components Procurement Machine Assembly
Design focuses on creating and detailing parts, assemblies, and systems that meet functional requirements.
Machine Design is a subset of mechanical design, specifically targeting the creation of complete machines.
It involves material selection, calculations for strength, motion, and durability.
Both require understanding forces, stresses, motion, and efficiency.
Goal: Build reliable, cost-effective, and user-friendly mechanical solutions.

DIY 3-Axis Hot Wire Foam Cutter For the Machining week

Introduction

The demand for complex foam cutting has increased in industries like packaging, aerospace, architecture, and RC modeling. Traditional single-axis cutters are limited to straight-line cuts. This project aims to design and build a 3-axis CNC- controlled hot wire foam cutter for cutting complex 2.5D profiles, airfoils, and custom shapes from thermoplastic foams like EPS and XPS.

Foam Cuttting Machine usage
Foam cutting machines are used to shape, trim, and carve different types of foam like PU, EPS, and EPE.
They help create precise parts for packaging, insulation, signage, and models.
Machine is CNC controlled for complex designs.
Hot wire, blade, and laser are common cutting methods depending on foam type.
They reduce material waste and improve production speed and accuracy.
Widely used in industries like construction, automotive, furniture,prototyping.Education,hobby and ent
ertainments

A Hot Wire Foam Cutter is a simple yet effective machine that uses a resistive wire heated by electricity to cut through foam like EPS or XPS

🔌 Component	Specification	Qty
Nichrome Wire	0.3–0.5 mm	1 loop (approx. 40–60 cm)
Aluminium profile	10 feet length	1 no
8mm linear rods	19 inches length	4
linear bearing	8mm dia	8 no
screw rod	600px dia 3 feet	1 no
gt2 timing belt	3feet lkength	2 no (optional)
t-screw	6mm dia	24 no
gt timing pulley	8mm bore	3 no
normal pulley	8mm bore	2–3
ball bearing	6mm bore	2 no
Nichrome	3mm wire	1 meter

Phase 1: Planning & Layout
Define Cutting Area Dimensions:
Example: 600mm (X), 400mm (Y), 300mm (Z).
Consider foam block size and tool reach.
Design the Frame:
Use T-slot aluminum
Sketch your gantry-based or moving-bed layout
. List Tools Required:
Drill, hacksaw or metal cutter, screwdriver set, multimeter, soldering iron, etc.
Phase 2: Mechanical Fabrication
1. T-slot aluminum Frame Construction:
Cut T-slot aluminum extrusions to the required lengths for the base and vertical supports.


Use corner brackets or L-joints to connect and square the frame.
Slide T-nuts into the slots to fasten components securely with bolts.
Assemble the base frame first, then attach vertical and cross members.
Ensure the entire structure is level, square, and rigid before mounting any motion components.


Cut and assemble the base and vertical supports.


Ensure 90° alignment using corner brackets or L-squares.


2. Mount Linear Rails:
Mark precise alignment points on the frame for each axis.


Secure the linear rails or support rods using clamps, brackets, or screws.
Attach linear bearings (e.g., LM8UU or V-slot wheels) to the moving gantry or carriage.
Slide the bearings onto the rods to test smooth movement and adjust alignment.
Tighten all fasteners after verifying straight, friction-free motion.
Attach rails or guide rods for X, Y, Z axes.
Install linear bearings


3. Mount screw rod:
Secure the stepper motor on a mounting bracket aligned with the axis.
Attach a shaft coupler to the motor shaft.
Insert the screw rod (lead screw or threaded rod) into the coupler and tighten.
Mount bearing supports at both ends of the screw rod.
Ensure the rod is straight and rotates smoothly without wobble or binding.
Fix stepper motors with brackets.




Connect GT2 belts or lead screws with pulleys/couplers.

Align idlers or bearings to ensure smooth motion.



4. Z-Axis Wire Arms:
Build two sliding arms that can move up/down or tilt.
Stretch nichrome wire between them with spring tension.


lace a properly sized thermocol block securely on the cutting bed or between wire arms.
Power on the machine and set the wire temperature using the PWM controller.
Load a test G-code file for a simple shape (e.g., square, circle, or airfoil).
Run the cutter and monitor for smooth movement and clean, smoke-free cuts.
Inspect the cut quality and adjust speed, wire tension, or temperature as needed.

Analyze and Solve Technical Problems

Improvement Steps Based on Assembly Experience