Maintenance, machine tools, drawings, and tables

NAVEDTRA 14256 — Bench Grinder

Bench grinders are used for reshaping and sharpening chisels, drills, hatchets, and other similar small hand tools. The bench grinder consists of a clamp (1), a rest (2), an abrasive wheel (3), a handcrank (4), and an encased gearing assembly (5). The clamp is used for fastening the grinder to a working surface. The rest supports tools which are being ground. It is adjustable and may be moved from side to side. The abrasive wheel may be changed depending upon the type of metal being ground.

NAVEDTRA 14256 — Care of Files

1. A new file should be broken in by using it first on brass, bronze, or smooth iron. 2. Never use a new file to remove the fins or scales on cast iron. 3. Do not use a new file on a narrow surface such as sheet metal, because the narrow edge of the metal is likely to break off the sharp points on the file teeth. 4. After using a new file, the teeth will clog up with metal filings. 5. Using a clogged file will scratch the work. This condition is called pinning. 6. One way to help prevent pinning is by rubbing chalk between the teeth before filing. 7. The best method to keep the file clean is to use a file scorer and file cleaner brush. 8. When cleaning a file with a file scorer (1), use a pulling motion, holding the file scorer blade parallel to the rows of teeth (2). 9. Finish cleaning by…

NAVEDTRA 14256 — Care of Pliers and Tongs

Remove dirt and grease with a clean rag and apply a light coat of oil after each use. Store pliers in a tool box or hang on racks when not in use. Do not remove insulation on handles or oil handles which are insulated. Do not use pliers for prying or for removing nuts or bolts. Replace all pliers which have broken jaws, handles, or cutting edges. 17-5/(17-6 blank) Chapter 18 VISES

NAVEDTRA 14256 — Care of Shears and Nippers

1. 2. 3. 4. 5. 6. 7. Keep tools clean at all times. Lubricate the pivot screw or bolt with a drop of light oil. Remove rust with a fine aluminum-oxide abrasive cloth. 8. Apply a thin film of oil on tools to prevent rust, and hang tools on hooks or place them on a shelf when not in use. Do not throw cutting tools together in a box where the cutting edges may be damaged. Do not use the shearing machine table as a storage place for other tools and work. Do not attempt to cut material heavier than the tools or machines are designed to handle. Do not use shears or nippers as hammers or pry bars, as they are easily damaged. 9. 10. Dull shears can usually be sharpened on an oilstone or with a file.

NAVEDTRA 14256 — Handsaw Filing Vise

The handsaw filing vise is a special purpose vise used for holding handsaws while they are being sharpened. It has jaws between 9-1/2 and 11 inches wide, and an attachment for holding a file at a constant angle.

NAVEDTRA 14256 — Machine Table Vise Piston Holding Vise

The machine table vise is a special purpose vise which may be bolted to a drill press, lathe, or table. It is available in two sizes, one having a 3-1/2-inch jaw width and a 3-inch jaw opening, and the other having a 6-inch jaw width and a 6-inch jaw opening. Machine table vises are used to hold small pieces of wood or metal for machining or drilling operations.