Your Cart (0)
Thumbnail Filmstrip of Robust Unhandled Neg. Rake Box Scraper - 3/4" Images
Robust 3/4" Negative Rake Box Scraper - Unhandled
This negative rake box scraper has a unique cutting profile that makes it ideal for cutting the side walls and bottoms of end grain boxes. The small radius point at the bottom corner of the scraper creates a smooth transition from a side wall to a flat bottom. Made from nitrided High Speed Steel, it measures 3/4” across and 9/32″ thick.
The bottom edges are radiused so that you can tip it at an angle for even more effective cutting. Sharpening just the bottom bevel maintains the nitriding on the top edge. The tang is rectangular, but will fit the 5/8″ collet in either of Robust's ER Collet based handle systems.
These tools are all offered unhandled. We offer Robust Collet Handles in 16” and 20” lengths. Alternatively, you may use the Oneway, Hosaluk, Sorby handles or make one yourself.
What’s special about Nitriding? All of the carbide and HSS cutting tools Robust uses to machine these tools are Nitrided. Nitriding is not a coating or plating, but a diffusion wherein extra carbon and nitrogen are added to the base metal. This zone is up to .002″ deep. The result: significantly improved edge holding and reduced sharpening.
To make these tools, Robust starts with premium HSS sourced here in the US. After machining the tools to shape, they are heat treated 62-64 Rockwell C. The hardened tools then go through the Nitriding process, increasing surface hardness up to 75 Rockwell C. Because the treatment is diffused into the metal itself, it will not flake, peel or chip. The tools are just as easy to grind as regular HSS, and sharpen well on conventional and CBN wheels.
But isn’t the Nitriding Removed during Sharpening? Gouges are sharpened on the end, and the cutting edge is defined by the intersection of the portion ground away and the flute. Since the flute is Nitrided, the cutting edge is also Nitrided. For scrapers, just grind the bottom bevel. This leaves the Nitriding on the top surface, so the burr is Nitrided. You’ll also like the radius on the corners of Robust's skews and scrapers, as this makes them more versatile for a number of different cuts.
Related Products
