Shop Practices, Materials, and Safety

What Shop Information Measures

Official ASVAB guidance describes Shop Information (SI) as knowledge of tools and shop terminology and practices. That phrase tells you the level of the subtest. It is not asking for trade-school mastery. It is asking whether you understand ordinary hand tools, power tools, fasteners, materials, measuring tools, and safe work habits.

On the computer ASVAB path, Auto Information and Shop Information are separate subtests. On paper forms, official guidance notes they are combined as Auto and Shop. PiCAT candidates should study them separately because PiCAT follows the computerized ASVAB model.

Measure Before You Cut

Shop work starts with measurement and layout. A ruler gives general length. A tape measure handles longer stock. Calipers compare inside, outside, and depth dimensions. A micrometer measures small dimensions more precisely. A square checks or lays out right angles. A level checks horizontal or vertical position.

Accuracy depends on both the tool and the task. A framing cut in lumber does not need the same precision as a machined shaft. If a question mentions thousandths of an inch, think precision measuring. If it mentions checking whether a corner is true, think square.

Cutting and Shaping

Cutting tools match the material and direction of cut. A rip cut follows wood grain. A crosscut goes across grain. Hacksaws cut metal. Coping saws and jigsaws handle curves. Files remove small amounts of material and smooth edges. Chisels cut or shape wood or metal depending on type.

Drill bits also match material. Twist bits handle many metal and wood tasks. Spade and Forstner bits are wood-boring tools. Masonry bits use hard tips and impact action for brick, block, or concrete. Cutting oil can help metal drilling by reducing heat and tool wear.

A pilot hole guides a screw and reduces splitting. A countersink creates a recess for the screw head. A tap cuts internal threads in a hole. A die cuts external threads on a rod. These terms appear often because they connect tool names to practical results.

Fasteners and Clamping

Fasteners hold parts together. Nails are common in rough carpentry. Wood screws bite into wood fibers. Machine screws and bolts use threads with nuts or tapped holes. Washers spread load, reduce surface damage, or help resist loosening. Rivets make a permanent mechanical joint.

Clamps hold work so hands do not become the fixture. A bench vise holds parts firmly. C-clamps and bar clamps apply controlled pressure. Locking pliers can grip irregular shapes, but they are not a substitute for proper clamping on machines.

A key safety idea is that the workpiece must be controlled. If the drill bit catches an unclamped piece, the piece can spin. If a sawed board is unsupported, it can pinch the blade or break. If a grinder contacts a loose part, the part can be thrown.

Abrasives, Finishing, and Materials

Sandpaper and grinding wheels use abrasives. Lower grit numbers are coarser and remove material faster. Higher grit numbers are finer and leave smoother surfaces. A sanding block helps keep a surface flat because pressure is spread across the block instead of concentrated under fingers.

Wood has grain, which affects cutting, planing, and splitting. Metal may be described by hardness, ductility, brittleness, or corrosion resistance. Sheet metal thickness may be given as gauge, where common gauge systems can be counterintuitive. Plastic can soften with heat and may crack if drilled incorrectly.

Material behavior matters. A brittle material may chip or shatter. A ductile material can stretch or bend. A hardened cutting edge can hold shape but may be damaged by overheating. Questions often ask which tool or procedure matches that behavior.

Safety Is Usually the Best Practice

Shop safety is not a side topic. It is part of the content. Eye protection is basic when cutting, grinding, drilling, or chipping. Hearing protection matters around loud equipment. Respiratory protection may be needed for dust, fumes, or paint. Gloves can protect during handling, but loose gloves around rotating machinery can catch and pull a hand into the tool.

Before using a power tool, inspect guards, secure the work, remove loose clothing or jewelry, and know where the switch is. On grinders, respect rated speed and stand clear of the wheel plane during startup. On drill presses, clamp the work and set proper speed for the material and bit size.

PiCAT Shop Strategy

For each SI item, ask what job is being performed: measure, cut, drill, fasten, hold, finish, or protect. Then choose the tool or practice built for that job. If two choices both sound familiar, pick the one that controls the workpiece and matches the material.

Do not answer from habit alone. A tool that works for wood may fail on masonry. A wrench that is convenient may not be the one used for specified torque. A faster cutting setup may be unsafe if the stock is loose. PiCAT shop questions reward practical, controlled work thinking.