Why Do High-End CNC Machines Still Rely on Hand-Scraped Box Ways?

In box-way systems, traditional master craftsmen’s hand-scraping remains an essential process for achieving high guideway accuracy.

 

By measuring and correcting each point manually, scraping minimizes sliding-surface errors and optimizes guiding performance.

 

Technical Advantages of Hand-Scraping：

1. High contact ratio for greater rigidity and positioning accuracy

Skilled craftsmen control depth and distribution to achieve 40–60% contact.

 

2. Correction of high spots for long-term geometric stability

Reduces deformation buildup and maintains straightness and squareness.

 

3. Enhanced damping for stable heavy cutting

Scraping patterns help absorb vibration and improve surface quality.

 

4. Oil-pocket structure for better lubrication

Crosshatch marks retain oil, reducing wear and extending guideway life.

 

5. Ideal for heavy-load and high-force cutting

High load capacity combined with increased contact rigidity supports demanding machining.

 

The true value of a CNC machine often lies in the craftsmanship you cannot see.