NRS 3" Straight & Domed (Body and Blade Options)

NRS 3" Straight & Domed

Patent Pending — 3rd generation advanced design.

The 3" Straight & Domed NRS is a wide-profile scraper combining straight and domed edges for versatile surface refinement on larger turnings. The generous 3" width covers substantial surface area per pass, with the straight section handling flat areas and the domed section transitioning into concave surfaces on platters and large bowls.

Key Features

• Precision-machined 3/8" thick heat-treated hardened stainless steel body
• Replaceable 10V steel blades with exceptional edge and burr retention
• 15V blade option for even longer burr life
• 3rd-generation advanced design for enhanced stability
• Taper lock bolster for fast handle removal and easier sharpening
• Shipped sharpened and ready to use
• Ergonomic and vibration-free in use

How It Works

Negative Rake Scraping is a technique pioneered by Stuart Batty in the 1990s. Unlike conventional scraping, it uses a blade with both a top and bottom bevel (like a skew) to create controlled abrasion rather than an aggressive cut. The blade edge is positioned at center height with the tool handle parallel to the floor — it does not require pointing downhill like a conventional scraper.

The technique relies entirely on a burr formed by grinding the lower bevel against a wheel or belt. The 20-degree negative rake top angle is pre-ground on each blade; you grind only the lower bevel to create the burr. You can set the grinding angle at 20, 22.5, 25, 30, 35, or 40 degrees using angle gauges. Lower angles produce a larger burr. Once the burr wears down, the blade must be resharpened to recreate it.

Unlike conventional and carbide scrapers, which must be kept narrow to reduce aggression, the NRS is never aggressive regardless of how much edge contacts the wood. This makes it highly effective for removing tool marks, uneven surfaces, and torn grain. It works best on medium to very dense woods; very soft or spalted woods may not respond as well.

Burr & Grit Guide

• 80 Grit: Very large burr, approximately 100 regrinds per blade (longest burr life)
• 120 Grit: Large burr, approximately 150 regrinds per blade
• 180 Grit: Medium burr, approximately 200 regrinds per blade
• 220 Grit: Medium burr, approximately 240 regrinds per blade
• 320 Grit: Fine burr, approximately 350 regrinds per blade
• 600 Grit: Very fine burr, approximately 600 regrinds per blade (shortest burr life)

Materials & Construction

The NRS body is precision-machined from 3/8" thick heat-treated hardened stainless steel. Blades are available in CPM 10V steel, which holds an edge/burr up to 350% longer than M42, and CPM 15V steel, which holds an edge/burr up to 50% longer than 10V. Each blade is supplied with a pre-ground 20-degree negative rake top angle and can be resharpened numerous times before replacement is needed. The tool includes a stainless steel taper lock bolster for secure mounting in the handle system.