Precision Microcontroller Heat-Sleeves Cutting Machine

1. Design Motivation & Need

In electrical harness and wire assembly lines, thousands of identical heat-shrink sleeve segments are required daily. Manual scissor cutting is inconsistent, causing material wastage and slowing assembly line throughput. A dedicated, benchtop automated cutter with sub-millimeter precision was engineered to streamline this process.

2. Mechanical & Feeding Mechanism

• Positive Traction Feed Rollers: Knurled and polyurethane-coated rollers ensure non-slip grip on flexible tubing without flattening the cross-section.
• Guillotine Shear Blade: Hardened tool steel shear actuated by a high-speed linear solenoid / cam mechanism for clean, burr-free cuts.
• Structural Enclosure: Designed in SolidWorks with clear acrylic safety guards and quick-access material spool reels.

3. Embedded Firmware & UI Logic

Engineered in embedded C++ on an ATmega / STM32 microcontroller platform:

• Non-Blocking Stepper Acceleration: Implemented trapezoidal ramp algorithms for jerk-free high-speed feed without missing steps.
• Material Runout Detection: Optical reflective sensors immediately pause operation and alert the operator when the reel runs out.
• EEPROM Memory: Stores previous batch presets (length, quantity, speed) across power cycles.