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A ball-peen or ball pein hammer, also known as a machinist's hammer, is a type of peening hammer used in metalworking. It has two heads, one flat and the other, called the peen, rounded. It is distinguished from a cross-peen hammer, diagonal-peen hammer, point-peen hammer, or chisel-peen hammer by having a hemispherical peen.

Etymology

In the word "ball-peen", peen, sometimes written pein, probably comes from a North Germanic source; compare dialectal Norwegian penn (“peen”), Danish pind (“peg”), German Pinne (“the peen of a hammer”), Old Swedish pæna (“to pound iron with a hammer”).

Uses

Besides peening (surface-hardening by impact), the ball-peen hammer is useful for many tasks, such as striking punches and chisels (usually performed with the flat face of the hammer). The peening face or ball face is useful for rounding off edges of metal pins and fasteners, such as rivets. It can also be used to make gaskets for mating surfaces: a suitable gasket material is held over the surface that needs a gasket, and the operator lightly taps around the edges of the mating surface to perforate the gasket material.

Variants

Variants include the straight-peen, diagonal-peen, and cross-peen hammer. Instead of a ball-shaped head, these hammers have a wedge-shaped head. The straight-peen hammer has a wedge oriented parallel to the hammer's handle. The cross-peen hammer's wedge is oriented perpendicular to the handle. The head of a diagonal-peen hammer, as the name implies, has a wedge set at a 45° angle from the handle; it can be a left angle or a right angle, and some peen hammers have a double diagonal wedge for ergonomic reasons. They are commonly used by blacksmiths during the forging process to deliver blows for forging or to strike other forging tools.

Head materials

Ball-peen hammer heads are typically made of heat treated forged high-carbon steel or alloy steel; it is harder than the face of a claw hammer. Softer brass heads are sometimes used.

References

1. Audel, Theodore (1962). Audel's new mechanical dictionary for technical trades. Theodore Audel. p. 54.
2. Don and Peg Doman (Jan 2021). "Ball Peen Hammers or Ball Pein Hammers All Look the Same to Me". thesubtimes.com. Retrieved Dec 19, 2024..
3. ^ "Double diagonal pein hammers". iforgeiron.com. Retrieved Dec 19, 2024.
4. ^ Ryan, V. (2019). "Hammers - Ball pein, cross pein and straight pein". technologystudent.com. Retrieved Dec 19, 2024..
5. "Peen" in wikdictionary.
6. Iniguez, Ramon C. "Lesson Planner: How to make a gasket using a ball-peen hammer". CTE Online. California Department of Education. Retrieved April 23, 2018..
7. Black Bear Forge (2019). "Forging the double diagonal peen hammer part 1". youtube.com (video). Retrieved Dec 19, 2024.. See also "Forging the double diagonal peen hammer part 2".
8. Cavette, Chris, "How a hammer is made", madehow.com, retrieved Dec 19, 2024.
9. Benford 2006, p. 36.

Bibliography

• Benford, Tom (2006). Garage and Workshop Gear Guide. MotorBooks/MBI. ISBN 0-7603-2312-7.

• Hammers
• Metalworking hand tools
• Woodworking hand tools