Technical Specification: Precision CNC Chip Thinning Feed Compensator

Overview

A high-performance, single-file browser application designed for CNC machinists and manufacturing engineers. This tool calculates the required feed rate adjustment for milling operations where the radial depth of cut (RDOC) is less than 50% of the tool diameter, preventing the common machining error of "rubbing" and extending tool life.

Core Features

• Real-Time Calculation: Dynamic recalculation using standard geometric chip thinning formulas: f_adjusted = f_target * (1 / (sqrt(D/a_e) * 2)).
• Input Validation: Real-time visual feedback for invalid entries (e.g., RDOC > Diameter).
• Dual Unit Support: Toggle between Imperial (inches) and Metric (mm).
• Responsive Interface: Adaptive layout suitable for desktop workstations and shop-floor tablets.
• Stateless Operation: Operates entirely in RAM; no cookies, no local storage, zero data tracking.

UI/UX Design

• Layout:
  • Header: Clean, centered, titled with breadcrumb-style navigation (hidden, as it's a single app).
  • Input Panel (Left/Top): Segmented card containing fields for Tool Diameter, Number of Flutes, Target Chip Load, Radial Depth of Cut (RDOC), and Spindle Speed (RPM).
  • Output Panel (Right/Bottom): High-visibility display showing the 'Adjusted Feed Rate' (IPM/MMPM) and 'Chip Thinning Factor' in a prominent, distinct callout box.
• Aesthetics:
  • Color Palette: Professional clean light mode: #F8FAFC (Background), #FFFFFF (Cards), #2563EB (Primary Action Blue), #334155 (Primary Text).
  • Typography: Sans-serif stack (Inter, system-ui).
  • Micro-interactions: Input focus states use subtle blue glows. Results update with a smooth opacity fade transition.

Technical Implementation Constraints

• Single File: All CSS/JS must be internal (<style> and <script> tags).
• Frameworks: Pure Vanilla JavaScript only. Use requestAnimationFrame for smooth UI updates.
• Security: CSP-compliant. No external script executions.
• Sandboxed Environment:
  • DO NOT use localStorage or sessionStorage.
  • DO NOT use alert(), confirm(), or prompt(). Create a custom div-based modal system for error messaging if required.
• Responsiveness: Use CSS Flexbox/Grid to collapse input columns on mobile devices (width < 768px).

Developer Directive

Follow a modern, modular structure within the single file:

1. CSS Layer: Define variables for colors and spacing. Use box-shadow for card depth.
2. State Layer: Maintain an object appState = { diameter: 0, rdoc: 0, ... }. Create a render() function that updates the DOM whenever appState changes.
3. Logic Layer: Handle the math inside a helper function that returns the adjusted feed rate. Ensure input sanitization to prevent NaN results.
4. Accessibility: Ensure all inputs have associated <label> elements and tab-order is logical.