Scraper  

Edge Angles
Overview

The Scraper's edge is shaped on a belt sander (preferred) or bench grinder.

What did you shave with, private? A bowl of milk and an angry cat?

Unknown Sergeant

 
General Guidelines
Edge Angle Value Comments
β1

Primary Bevel

40° - 75°

Increase this angle when the tool is being used for scraping harder items (e.g., a gasket scraper).

This edge should be thin, and I recommend it be no larger than 1/8" (3mm). If it is, re-grind the secondary bevel as necessary to reduce its size.

Be sure to de-burr this edge after sharpening. Breaking off the burr through use will cause the edge to be jagged.

β2

Secondary Bevel

~ 30°

It is recommended to keep what came on the tool from the manufacturer. An estimate is given here in case the tool needs to be re-ground, as will happen when the primary bevel becomes too large.

Notes & Comments

Information regarding Grindstones

If grinding this on a high speed grinder, be sure to manage the temperature so that the temper is not lost due to overheating. If there is a carbide insert, DO NOT cool by dipping in water. This will cause the carbide to crack due to shocks. Otherwise, cool by dipping as needed in water.


More Information

Books & Papers