Business / Machine Shop Glossary

Fishtail: A common name for the center gage. It is used to set thread cutting tools and has scales on it for determining the number of threads per inch.

Fit: The relation between mating or matching parts, that is, the amount of, or lack of play between them.

Fixture: A production work-holding device used for machining duplicate workpieces. Although the term is used interchangeably with a jig, a fixture is not designed to guide the cutting tools as the ji . . . View Full Definition

Flange: A relatively thin rim around a part.

Flute: The groove in a cutting tool which provides a cutting edge and a space for the chips to escape and permits the cutting fluids to reach the cutting edges.

Flycutter: A single-point cutter mounted on a bar in a flycutter holder or a flycutter arborused for special applications for which a milling cutter is not available.

Follower Rest: A support for long, slender work turned in the lathe. It is mounted on the carriage, travels close to and with the cutting tool and keeps the work from springing away.

Footstock: Part of an indexing, attachment which has a center and serves the same purpose as the tail stock of a lathe.

Force Fit: A fitting which one part is forced of pressed into another to form a single unit. There are different classes of force fits depending on standard limits between matingparts.

Forge: To form or shape heated metal by hammering. Also, the name of the unit used for heating metal, as the blacksmith's forge.

Formed Cutters: Milling cutters, which will produce shaped surfaces with a single cut are so designed that they may be sharpened without changing their outline or shape.

Forming Tool: Tool ground to a desired shape to reproduce this shape on the workpiece.

Fpm: Feet per minute of workpiece.

Free Cutting Steel: Bar stock containing a high percentage of sulfur making it very easy to machine.

Free Fit: A class of fit intended for use where accuracy is not essential or where large temperature variations are likely to be encountered, or both conditions.

Fuel Gas: A gas such as acetylene, natural gas, hydrogen, propane, stabilized methylacetylene propadiene and other fuels normally used with oxygen in one of the oxyfuel processes and for heating.

Fulcrum: The point or support on which a lever turns.

Fusion: The joining of base material, with or without filler material, by melting them together.

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