Tools and Their Uses

Workshop Philosophy & Ten General Safety Rules

The cardinal tenet of workshop operations is: "A place for everything and everything in its place." Personal efficiency and safety are judged by how tools are maintained and handled.

• Safety Shoes: Steel-toed impact shoes for heavy machinery; non-sparking static-dissipating shoes (built without metallic nails/eyelets) for volatile fuel/ordnance spaces.
• Eye Protection: Shatter-resistant polycarbonate goggles; shaded filter lenses for UV/IR protection during welding and thermal cutting.
• Helmets (Hard Hats): Polycarbonate/polyethylene shells with shock-absorbing suspension. Regular hard hats insulate up to 2,200 volts; electrical worker helmets must withstand 20,000V proof-tests.
• Gloves: Flameproof welding leather; dielectrically tested rubber gloves for live circuits. Prohibition: Gloves must NEVER be worn around rotating spindles, chucks, drill presses, or lathes.
• Power Tool Safety: Inspect cords for loose prongs or oil deterioration; ensure tool switch is OFF before plugging in; keep full attention; disconnect power before clearing jams; always use 3-conductor grounded cords.

Toolboxes & Storage Equipment (Chapter 4)

Proper storage prevents rust, protects cutting edges, and guarantees immediate accountability:

• Mechanic's Tool Chest: Heavy-gauge sheet steel multi-drawer rolling cabinet housing extensive wrench, socket, and diagnostic sets.
• Hardwood Machinist's Tool Chest: Felt-lined quartersawn wood drawers that absorb humidity, preventing condensation and cushioning precision instruments (micrometers, verniers, gage blocks).
• Portable Carpenter's Tool Box: Deep tote with integrated wooden racks to keep hand saw teeth from striking metal tools.
• Cantilevered Tray Tool Box: Linkage automatically steps tiered trays outward upon opening, displaying all tools without manual tray lifting.
• Canvas Tool Bag: Flexible, non-sparking, reinforced heavy canvas bag preferred by linemen and aloft rigging crews.

Reading Measuring Scales (Chapter 3)

The standard 12-inch machinist's rule features four distinct edges:

• Eighths (1/8") & Sixteenths (1/16"): Longest lines indicate whole inches; intermediate lines mark 1/2" and 1/4"; shortest lines indicate 1/8" and 1/16".
• Thirty-Seconds (1/32"): Every 4th line represents 1/8" (4/32"). Formula: 5/8" = 20/32".
• Sixty-Fourths (1/64"): Every 16th line represents 1/4" (16/64"). Formula: 3/4" = 48/64".
• Fraction Reduction: Always reduce fractions to lowest common terms (e.g., 16/32 = 1/2; 24/64 = 3/8).
• Metric Scale: 1 meter = 100 cm = 1,000 mm. Millimeter lines (0.1 cm) allow direct decimal reading.

Rules and Steel Tapes (Chapter 8)

• Steel Rules (6" & 12"): Thinner rules reduce parallax error because graduation marks sit directly adjacent to the work. End graduations permit measuring narrow slots.
• Folding Rules (2 to 6 feet): Wood or aluminum zig-zag rules. Unsuitable for precision metalwork because play develops at riveted joints over time.
• Steel Tapes (6 to 300 feet): Short tapes feature a curved rigid cross-section to allow extension without buckling. Long survey tapes (50-300 ft) are flat ribbons requiring continuous support to prevent measurement errors from gravitational sag. Sliding end hooks automatically compensate for hook thickness during push-butt (inside) and pull (outside) measurements.

Dividers & Scribers (Chapters 5 & 12)

• Spring Dividers (3"–10"): Straight legs tensioned by a C-spring loop and adjusted by a threaded rod and knurled nut. Scribes arcs, circles, and steps off increments. Lean 5°–10° in travel direction during scribing.
• Wing Dividers (6", 8", 12"): Steel quadrant wing with thumbscrew clamp and fine micro-adjustment screw. Optional removable leg accepts pencils.
• Machinist's Scribers: Single-point pocket (reversible point), bent-point/straight-point (straight tip for flats, 90° hook for inside bores), and tungsten carbide scribers (scores glass and hardened steel). Draw in a single continuous stroke at 45° against a steel rule.

Calipers & Trammels (Chapter 6)

• Simple Outside & Inside Calipers: Bowlegged for outside diameters; straight with outward feet for bores. Adjusted by tapping against a bench.
• Transfer Calipers: Features an auxiliary locking leaf on one leg. The legs can be opened to clear a raised flange or groove and returned to the leaf stop to restore the exact dimension.
• Hermaphrodite Calipers: One sharp divider point, one curved caliper leg. Used for locating shaft centers and scribing lines parallel to an edge.
• Slide Calipers: Pocket rule with stepped "OUT" and "IN" jaws and integral depth gauge.
• Vernier Caliper: Measures inside, outside, and depth to 0.001 inch (0.02 mm). The beam is divided into 0.025" increments (40 divisions/inch). The vernier scale has 25 divisions equal to 24 beam divisions.
• Inside Caliper Allowance: If taking inside readings without an inside scale, add the jaw thickness: 0.250" for 6" calipers, 0.300" for 12"/24" calipers, and 0.500" for 36" calipers.
• Trammels (Beam Calipers): Clamped heads sliding along a long steel beam for scribing circles and measuring distances beyond standard caliper limits.

Micrometers (Chapter 7)

High-precision measuring instruments utilizing a ground lead screw with 40 threads per inch ($1 rev = 0.025"$).

• Outside Micrometers (0-1", 1-2", up to 24"): The barrel has numbered tenths (0.100") and 0.025" subdivisions. The beveled thimble is divided into 25 parts ($1 mark = 0.001"$). Always use the ratchet stop to apply uniform measuring pressure.
• Vernier Micrometers: Adds 10 longitudinal vernier lines to the barrel matching 9 thimble divisions, reading directly to 0.0001 inch.
• Metric Micrometer: 0.5 mm lead screw pitch. Barrel divided into 1.0 mm and 0.5 mm lines. Thimble divided into 50 parts ($1 division = 0.01 mm$). Requires two revolutions to advance 1.0 mm.
• Inside & Depth Micrometers: Inside micrometers use interchangeable extension rods with a 0.500" screw range and 0.500" collar. Depth micrometers feature a ground flat base (2"-6") and extension rods (0-9"); graduations are reversed (read from the highest number covered).
• Care Rule: Never store a micrometer with the spindle clamped tightly against the anvil; thermal expansion strains the lead screw.

Surface, Depth & Height Measurement Systems (Chapters 9 & 14)

• Surface Plate: Solid close-grained cast iron or granite reference table, ribbed underneath, hand-scraped optically flat to millionths of an inch. All precision layout originates here.
• Surface Gage: Heavy base with V-grooves, bottom guide pins, and rocker fine-adjustment screw. Carries a 4"-18" spindle holding a scriber or dial indicator to transfer heights or verify surface parallelism.
• Vernier Height Gage: Precision caliper mounted to a heavy ground base plate for layout and inspection on surface plates (graduated in 0.025" with 0.001" vernier).
• Dial Depth Gage: Spring-loaded rod with dial indicator reading directly in 0.0005" for checking holes, recesses, and paint thickness.
• Adjustable Parallels (Ch 9): Interlocking wedge-shaped steel blocks measured with a micrometer; used as leveling blocks and machine setup gages.
• V-Blocks and Clamps: Matched 90° precision V-blocks with U-clamps for holding round shafts during drilling, milling, or plate inspection.
• Angle Plates: Ground 90° cast iron fixtures with bolt slots for clamping workpieces vertically.
• Magnetic Base Indicator Holder: Permanent switchable magnet base with articulated arms for holding dial indicators on machine tools.
• Registering Speed Indicator: Rotary mechanical tachometer spindle engaging shaft centers to count revolutions up to 5,000 RPM in either direction.

Ring Gages, Snap Gages & Precision Gage Blocks (Chapter 15)

• Tolerance Classes: Class X (0.00004" master), Class Y (0.00007" inspection), Class Z (0.00010" working), Class ZZ (0.00020" ring only).
• Plain Ring Gages: Inspects external diameters. The GO gage is larger (maximum material size); the NO GO gage is smaller and marked with an annular groove on the knurled outside.
• Snap Gages: Nonadjustable solid (GO and NO GO jaws; progressive snap gages combine GO and NO GO in one throat) and adjustable (4-pin, 4-button, and 2-button + block anvil sets).
• Precision Gage Blocks (Johansson Blocks): Cryogenically stabilized alloy steel blocks lapped optically flat. Sets range from 5 to 85 blocks (0.010" to 20").
• Wringing Procedure: Wipe clean; slide blocks together with a rotary motion under 0.5 to 2 lbs pressure. Molecular attraction and thin oil films fuse them solid.
• Temperature Standard: Calibrated at exactly 68°F (20°C). Touching blocks conducts body heat, producing errors of several millionths of an inch. Perspiration acid causes staining. Always wipe with boiled petrolatum before storage; never leave wrung together.

Miscellaneous Measuring Gages (Chapter 16)

• Thickness (Feeler) Gages: 2 to 26 tempered steel leaves (0.0015" to 0.040") in straight, stepped, or 45°/90° offset blades for checking valve clearances and piston ring gaps.
• Center Gage: 60° fish-tail template for grinding lathe threading tools and setting tools perpendicular to work. The back carries a table of double depth of American National threads for tap drill selection. Graduated in 14ths, 20ths, 24ths, and 32nds.
• Screw Pitch Gages: Up to 51 blades with teeth matching threads per inch (including 11-1/2 and 27 TPI pipe threads) to identify unknown pitches.
• Small Hole Gages (1/8" to 1/2"): Split-ball end expanded by knurled handle screw; measured with outside micrometer.
• Telescoping Gages (1/2" to 6"): Spring-loaded plungers locked by handle screw and calipered with a micrometer. Take reading only once.
• Thread Cutting Tool Gages: 29° templates for grinding Acme and Square thread tools.
• Fillet and Radius Gages: 16 double-ended blades marked in 64ths for checking concave fillets and convex outside radii.
• Drill Point Gage: 6-inch hook rule with a 59° sliding head for checking lip angle and lip length symmetry after drill grinding.
• Wire & Drill Gages: Circular disk wire gages (AWG, English Standard 0-36, US Sheet). Hardened plate drill gages for Number (#1 to #60), Fractional (1/16" to 1/2"), and Letter (A to Z) drills.
• Marking Gage: 8-inch beam with 1/16" steel spur pin and sliding head for scribing parallel lines on wood.

Levels (Chapter 10)

Proves true horizontal and true vertical (plumb) using ground spirit vials filled with alcohol/ether:

• Master Precision Level: Ground graduated main vial sensitive to 10 seconds of arc ($0.0005 in/ft$). Ground parallel top and bottom, with two smaller vertical vials.
• Machinist's Level: Extra-large sensitive vial with an inverted V-groove base to fit over cylindrical shafts and pipe lines.
• Iron Bench Level: Ribbed cast-iron truss-pattern frame for lightness and rigidity in construction.
• Striding Level: Elevated legs engineered to span over lathe carriages, cabling, or piping obstructions to check lathe flatways.
• Carpenter's Level: Wood or aluminum frame with horizontal, vertical, and 45° angle vials.
• Line Level: Lightweight aluminum tube with twin hooks for hanging at the center of a taut mason's cord.
• Reversal Calibration Test: Check bubble position, reverse level 180° end-for-end on the exact same surface; bubble must rest in the identical position.

Plumb Bobs (Chapter 11)

• Surveyor's Polished Brass Plumb Bob: Spool type or adjustable cap type with replaceable hardened steel point (6, 8, 10, 16 oz). Comes with minimum 7 feet of nylon/silk/linen cord. Heavier 16 oz bobs resist wind deflection.
• Solid Steel Plumb Bob: Round or hexagonal bodies (3, 8, 12 oz) for general construction.
• True Vertical Post Squaring: Overhand knot inside cap; hang bob from a rule extending 2 inches from the post top; measure distance at the bottom with a second rule. Adjust post until top and bottom readings match; repeat on adjacent side.
• Care: Coat with heavy oil and wrap in oil-soaked paper for long-term storage.

Squares (Chapter 13)

• Carpenter's Framing Square: Blade/Body (24"x2") and Tongue (16"x1.5").
  • Rafter Table: Calculates lengths of common, hip, valley, and jack rafters per foot run.
  • Octagon (8-Square) Scale: Lays out an equilateral octagon onto a square timber.
  • Essex Board Measure: Computes board feet of lumber for given widths and lengths.
  • Brace Measure: Computes hypotenuse lengths of diagonal timber braces.
• Try Square: Fixed 90° blade (2"-12") in wood/steel stock. Light must not be seen around the blade edge when testing joints.
• Combination Square: 12" slotted rule + Center Head (bisects 90° to find shaft centers), Protractor Head (revolving turret 0-180° with spirit level), and Square Head (90° and 45° faces, level vial, and scriber; used also as height/depth gage).
• Sliding T-Bevel & Bevel Protractor: Sliding T-bevel transfers arbitrary angles. Precision bevel protractors include a vernier dial and acute angle attachment.

Vises & Bench Fixtures (Chapter 18)

• Machinist's Bench Vise: Rough serrated steel jaws, heavy lead screw, and 360° swivel base. Use copper, brass, or leather caps to protect polished or soft stock. NEVER oil the swivel base plate (oil destroys clamping friction).
• Bench & Pipe Vise: Dual-purpose vise with standard flat jaws above and curved pipe jaws below.
• Clamp Base Bench Vise: Portable, lightweight vise clamped to bench edges.
• Pipe Vises: Hinged yoke pipe vise (1/8" to 4") and chain pipe vise (wraps pipe up to 8" with high-tensile link chain).
• Machine Table Vise: Low-profile ground vise for bolting to drill press, milling, or shaper tables (3" and 6").
• Pin Vise: Miniature knurled chuck holding micro-drills, taps, and files from 0 to 0.187 inch.
• Piston Holding Vise: Padded curved jaws holding engine pistons up to 5-1/2 inches diameter without distorting skirts.
• Handsaw Filing Vise: Wide 9-1/2" to 11" jaws with cam clamp and file angle guide to prevent saw blade flutter.
• Storage Position: Bring jaws lightly together (1/8" gap) with handle vertical.

Clamps (Chapter 19)

• C-Clamps: Forged steel frame with swivel foot. Select a clamp with an opening 1-1/2 to 2 inches wider than work. Tighten by hand only; never use wrenches or cheater bars. Protect surfaces with wood or brass blocks.
• Hand Screw Clamps: Seasoned hardwood or plastic jaws adjusted by dual independent right-and-left screws. Accommodates parallel or angled/tapered wood assemblies without marring. Apply boiled linseed oil to wooden jaws.

Screwdrivers (Chapter 22)

• Common Slotted: Cabinet (thin round shank for deep counterbores), heavy-duty square shank (accepts wrench assist for stubborn screws), close-quarter stubby, and screw-holding (spring clip / sliding collar for starting only).
• Cross-Tip (Phillips): 30° flutes with rounded corners and blunt nose; engineered to cam out under excessive torque (#1 to #4).
• Cross-Point (Reed & Prince): 45° sharp pointed tip; does not cam out; one driver fits multiple screw sizes.
• Clutch Head: Hourglass / butterfly recess (old style stepped vs new style).
• Offset Screwdrivers: Standard Z-shape, 4-blade double tip, and reversible ratchet offset for tight quarters.
• Spiral Ratchet (Yankee): Push-driven spiral spindle for rapid driving with directional lock.
• Jeweler's Screwdrivers: Swiveling palm rest with knurled body (0.025" to 0.1406" blades).
• Gimlet (Screw Starter): Threaded spiral tip for boring screw pilot holes in wood.
• Dressing: Grind slotted screwdriver tip sides parallel (never tapered/rounded) so the blade will not climb out of the slot.

Wrench Systems (Chapter 25)

• Open-End: 15° jaw offset allows turning hexagonal nuts in 30° swings by flipping the wrench. Engineer's double/single, S-shape (22.5° offset), ignition (15° and 60°), and construction/spud wrenches (jaw + long tapered drift pin handle for structural hole alignment).
• Box-End: 6-point and 12-point; 15° shank offset. Double offset, half-moon curved, structural tapered, ratchet-box (light spinning only), and split-box flare-nut wrenches (clears fuel/brake lines).
• Sockets & Handles: 1/4", 3/8", 1/2", 3/4", 1" drive; standard and deep well; spark plug sockets with internal rubber cushion; universal joint sockets. Handles: straight/flex ratchets, sliding T-bar, speeder, hinged breaker bar, and torque multipliers.
• Special Sockets: 4-way spider wheel lug wrench, cam/wedge stud removers, crowfoot wrenches, hex key Allen wrenches, and plug wrenches.
• Adjustable Wrenches: Crescent wrench (ALWAYS pull toward the fixed jaw), locking clamp pliers (Vise-Grips; for rounded fasteners), monkey/auto wrenches.
• Pipe Wrenches: Stillson wrench (floating hook jaw bites into pipe; never use on hex nuts), strap wrench (woven webbing for polished brass/copper), and chain pipe wrench (up to 12" pipe).
• Torque Wrenches: Deflecting beam, dial, and micrometer click-type. Power Torque Wrench uses a hand crank and planetary gear train for 200+ ft-lbs. Return torque wrenches to zero before storage.
• Spanner Wrenches: Hook spanners (fixed/adjustable), hose coupling pin spanners, pin spanners, and face spanners.

Hammers, Mallets & Mauls (Chapter 21)

• Carpenter's Claw: Curved claw (nail pulling) vs straight claw (ripping/demo); flat face (rough) vs bell face (crowned to prevent dents). Never strike steel punches with a claw hammer.
• Machinist's Peen: Ball peen (riveting/swaging), cross peen (transverse wedge), straight peen (longitudinal wedge).
• Sledge & Demolition: Double-face sledge (6-16 lb), club hammer (3-4 lb masonry hammer), and napping hammer (3 lb stone breaker).
• Specialty: Bumping body hammer (sheet metal), jeweler's (1.75-2 oz), mason's (chisel/hammer), riveting, setting hammer (square face + beveled seam edge), trimmer's (butt claw), welder's chipping hammer (pick + wire brush).
• Soft-Faced Hammers: Lead/copper (restorable by filing); inserted soft-faced with color-coded interchangeable faces:S-Brown (Soft Rubber/Wood), M-Red (Medium Rubber), T-Green (Hardwood/Lead), N-Cream (Medium Hard Lead/Plastic), H-Black (Hard Plastic/Micarta), XH-Yellow (Extra Hard Copper/Fibre).
• Dead Blow Hammers: Shot-filled rubber-encased hammer; eliminates rebound, delivering 100% kinetic impact. Types: standard, slimline, sledge, ball peen.
• Mallets & Mauls: Carpenter's banded wood, rawhide rolled leather, rubber, tinner's beechwood, railroad track maul (10 lb spike driver), wooden maul (8"x10" cylinder for wood stakes).
• Handle Replacement: Saw flush; drive stub with drift pin; seat new hickory handle with rubber mallet; drive glued wooden wedge; saw flush; drive metal cross-wedge; grind flush.

Jacks, Pullers, Bars & Rigging (Chapters 20, 41, 42, 43, 48, 53)

• Jacks (Ch 20): Bell-base screw jacks, ratchet lever track jacks (raises on downstroke, lowers on upstroke), hydraulic bottle jacks (3-100 tons), push-pull hydraulic outfits (Porto-Power pump, hose, ram, attachments). CARDINAL RULE: NEVER crawl under a load supported only by a jack; block with timber cribbing immediately.
• Mechanical Pullers (Ch 41): Universal gear pullers (0-14" dia), electrical unit pullers (thin jaws for alternators), Pitman arm pullers, push-pull sets with bearing splitters, cylinder sleeve pullers (expanding shoe), slide hammer pullers, and S-shaped cotter pin pullers.
• Bars & Mattocks (Ch 42 & 43): Wrecking bars (gooseneck claw + chisel), crowbars (4-6 ft, 12-20 lbs), pinch bars, combination bars. Cutter mattocks (horizontal hoe + vertical root ax) and pick-mattocks. Rub raw handles with boiled linseed oil.
• Timber & Rigging (Ch 48 & 53): Timber carriers (two-man 4-ft scissor tongs), peavies (spike + cant hook), rigging pulley blocks (snatch blocks), trip wire grapnels (detonates mines/booby traps from cover), transport chains, cable jaw grips (Chicago grips), and tension pullers (come-alongs, 1-3 tons).

Chisels & Punches (Chapters 26 & 27)

• Chisels: Wood chisels (socket type for mallet blows vs tang type for hand pressure). Cold chisels (60°-70° cutting angle): flat cold chisel, cape chisel (keyways/slots), roundnose (oil grooves), diamond point (V-grooves), track chisel (5.5 lb railroad chisel with sledge), rivet buster. Dress mushroomed heads immediately on a grinder.
• Punches: Center punch (90° cone for drill starting), prick punch (30°-60° acute layout point), drift punch (tapered flat tip for pin removal), alignment spud punch (long gradual taper), starting punch, drive pin punch (straight cylindrical pin), Catapunch (automatic spring-loaded punch), tinmen's hollow punch (sheet metal/gasket washers), grommet punch, lever punch (toggle press).

Files, Scrapers, Grinders & Stones (Chapters 28–31)

• Files: Cuts: Single-cut (shearing/finishing/sharpening), double-cut (roughing), rasp-cut (wood/leather), curved-tooth Vixen (aluminum/lead). Coarseness: Coarse, Bastard, Second-cut, Smooth, Dead smooth. Shapes: Mill, pillar, round (rat-tail), square, taper (60° saw file), three-square, warding, Swiss pattern (#00 to #6). Techniques: Cross-filing (forward stroke only) vs draw-filing (transverse grip for satin finish). Clean with file card; chalk face. Never use without a handle.
• Bench Grinders: Adjust tool rest 1/16" to 1/8" max from wheel. Valve grinders for engine valve refacing. Oilstones: natural Novaculite (Washita, Arkansas) and synthetic (Silicon carbide Crystolon, Aluminum oxide India). Lubricate with mineral oil/kerosene; stroke in figure-8.
• Scrapers & Awls: Carbon scrapers (flexible blades for heads/pistons), bearing scrapers (curved hollow-ground for babbitt), box scrapers (wood), flat blade scrapers (machine beds), triangular scrapers (bore deburring). Saddler's awl (diamond blade) and scratch awl.

Saws, Knives, Glass Cutters & Planes (Chapters 32–34, 46, 50)

• Bolt & Cable Cutters (Ch 32): Compound toggle linkage. Center cut (equal bevel), clipper cut (flush), shear cut flat bar, side nut splitter, angular cut (30°), shear cut cable. Security controlled.
• Glass Cutters (Ch 33): Wheel-type and circle cutters (2"-24"). Single lubricated score with light oil/turpentine; tap underside with ball end; snap over edge.
• Knives (Ch 34): Rubber cutting knives, saddler's round knives (skiving leather), utility shop knives, draw knives (dual handles for shaping spars), putty knives.
• Planes (Ch 50): Block plane (6-7", cutter set low at 12°-20° bevel UP, no chip breaker; end-grain trimming; toe knob) vs bench planes (45° bed angle, cutter bevel DOWN with cap iron/chip breaker; smooth 8-9", jack 14-15", jointer 22-24"). Always lay planes on their side on benches.
• Saws (Ch 46): Ripsaws (cuts with grain, 8° chisel rake, 5.5-7 PPI) vs crosscut saws (cuts across grain, 45° knife teeth, 7-12 PPI). One-man/two-man crosscut saws. Backsaws (stiff brass/steel spine for miter boxes), nested saws (keyhole enters 1/4" hole, compass). Hacksaws: All-hard vs flexible blades; 14 TPI (heavy steel), 18 TPI (general), 24 TPI (pipe/channel), 32 TPI (thin sheet/conduit; keep ≥ 2 teeth engaged). Forward push strokes at 40-50 strokes/min.

Pipe & Tubing Fabrication

• Pipe Cutters (Ch 35): Cutting wheel + two guide rollers (1/8"-2" and 2"-4"). Advance 1/4 turn per revolution. Mandatory: Always ream internal constriction burr with a pipe reamer before threading.
• Pipe Threading Set (Ch 35): Ratchet diestock with NPT segmental dies (American Standard Pipe taper 3/4 inch per foot). Flood with sulfurized cutting oil; advance 1/2 turn, back off 1/4 turn to snap chips.
• Tube Cutters & Flaring Tools (Ch 36): Tube cutters (grooved rollers for cutting off damaged flares flush). Flaring tools (split die block + 45° cone yoke). Single flare for copper/brass; double flare (with adapter buttons) for automotive high-pressure brake lines.
• Tube & Conduit Benders (Ch 40): External/internal spring benders for soft tubing; hand lever tube benders (0°-180° calibrated radius block); electrical conduit shoe and hickey hand benders (1/2" to 2").
• Taps and Dies (Ch 38): Three-piece hand tap set: Taper (8-10 threads chamfer), Plug (3-5 threads), Bottoming (1-1.5 threads). Boiler, staybolt, and mud washout taps (6 flutes, 1-1/4" taper/ft, 12 TPI). Hex rethreading dies (thread repair with wrench), two-piece collet dies, and round split adjustable dies. Tap drill formula: $Drill = Major Dia - 1/TPI$.
• Reamers (Ch 39): High-precision hole sizing to 0.0005". Solid straight, solid taper-pin (1/4" taper per foot), expansion (expands 0.005"-0.010"), adjustable blade, and pipe reamers. CARDINAL RULE: NEVER rotate a reamer backwards (counter-clockwise); cutting teeth will chip and dull instantly.

Field & Tree Operations

• Chopping Tools (Ch 45): Single-bit ax (curved handle), double-bit ax (straight handle; thin felling blade + thick ground blade), crash ax (20,000V insulated handle, pick), half-hatchet (blade, hammer poll, nail claw), adz (horizontal blade perpendicular to handle for hewing logs), timber wedges.
• Brush-Cutting (Ch 47): Brush hook (curved blade on 36" ax handle) and military 18-inch machete (widest at tip).
• Climbing Tools (Ch 49): Lineman safety belt with forged D-rings, adjustable safety pole strap with snap hooks, and leg irons with spurs/gaffs. Inspect gaff sharpness with gaff gages; climb with knees 4" from pole. Treat leather with neat's-foot oil.
• Digging Tools (Ch 51): Long-handled shovel (round point), D-handled shovel (close quarters), spade (flat square slicing blade for sod/trenches), spiral posthole auger, and clamshell posthole digger.
• Gasket Cutters (Ch 44): Compass circle gasket cutter (4"-20"), bit brace circle cutter (1"-5.5" or up to 9-3/4"), hollow punches (1/4"-5/8"), and bench mount rotary shear cutter.

Pioneer Power Tools & Critical Safety Rules

• Portable Electric Drill: 1/4", 3/8", 1/2" keyed chucks. Prick punch center mark first; verify grounding; ease pressure as bit breaks through back of metal.
• Portable Electric Hammer: Pneumatic reciprocating piston for drilling concrete/brick with star drills. OPERATING RULE: Apply LIGHT hand pressure only and place bit against work BEFORE depressing switch to prevent destroying internal precision piston parts. Always wear hearing protection.
• Electric Impact Wrench: Rotary impact mechanism delivering high torque for nuts/bolts. SAFETY WARNING: NEVER use standard chrome hand sockets with an impact wrench! Standard sockets shatter like glass under shock loads, causing catastrophic injury. Always use heavy-duty black-oxide IMPACT SOCKETS.
• Portable Electric Circular Saw: Retractable lower blade guard; tilting shoe for 0-45° bevels. SAFETY RULE: The blade must be revolving at FULL SPEED before contacting the workpiece to prevent violent kickback.
• Electric Chain Saw: Bar frame, cutter chain, tensioning screw, automatic oiler. Stand to the left; never contact bar nose with obstructions (prevents kickback).
• Portable Electric Disk Sander: Flexible backing pad; hold at 10°-15° angle. Do not apply excessive downward pressure (stalls motor, overheats windings, glazes disk).

Masonry & Mining Field Tools (Chapter 53)

• Cement Trowel: Flat rectangular steel blade for smoothing wet concrete.
• Brick Trowel: Pointed triangular blade with cranked neck for scooping and spreading mortar.
• Miner's Spoon: Long slender copper or brass rod with cupped spoon ends. Used to lift rock dust out of deep dynamite blast holes. Copper/brass prevents friction sparks that could ignite explosives.
• Rigging Blocks: Pulley tackle with single, double, or triple sheaves. Snatch blocks open to insert wire rope. Never oil pulley grooves.
• Trip Wire Grapnel: 3-4 pronged grappling hook on cord for snagging concealed tripwires and detonating mines from cover.
• Cable Jaw Grip (Chicago Grip): Parallel serrated jaws that clamp tighter as cable pulling tension increases.
• Tension Puller (Come-Along): Portable ratchet cable winch hoist (1-3 tons) for tensioning cables and vehicle recovery.

Top 25 Testing Points from Assignments 1 through 5

1. Safety Responsibility (Q 1-6): The most important part of safety procedures is YOU.
2. Hard Hat Voltage Limits (Q 1-13 & 1-14): Standard hard hats protect up to 2,200 volts; electrical worker helmets must pass 20,000V proof-tests.
3. Scale Conversion (Q 1-19): If 1/4" = 16/64", then 3/4" = 48/64".
4. Precision Caliper Resolution (Q 1-36): Difference between 25 vernier divisions and 24 beam divisions is 1/1000 inch (0.001").
5. Micrometer Range & Movement (Q 1-41 & 1-48): Maximum spindle-to-anvil travel is 1 inch (the range); 40 TPI screw moves 0.025 inch per revolution.
6. Gage Block Measuring Temperature (Q 2-36): Standard worldwide temperature is 68°F (20°C).
7. Why Unwring Gage Blocks (Q 2-37): Blocks left wrung together for extended periods will corrode.
8. Center Gage Graduations (Q 2-44): Graduated in 14ths, 20ths, 24ths, and 32nds of an inch with 60° angles.
9. Telescoping Gage Capacity (Q 2-48): Maximum measuring capacity is 6 inches.
10. Pliers for Cutting Only (Q 2-57): Diagonal cutting pliers must be used for cutting only; never for gripping.
11. Vise Capacities (Q 2-58 & 2-59): Piston vise holds up to 5-1/2"; pin vise chuck holds 0 to 0.187".
12. Soft-Faced Hammer Extra-Hard Color (Q 3-9): Yellow (copper/fibre face).
13. Wood Screwdriver Pilot Tool (Q 3-16): Screw starter or gimlet.
14. Wrench / Alignment Drift Combination (Q 3-22): Construction (spud) wrench.
15. Adjustable Wrench Force Rule (Q 3-46): Always apply pulling pressure against the stationary (fixed) jaw.
16. High-Torque Wrench for 200+ ft-lbs (Q 3-43): Power torque wrench (hand crank with gear train).
17. Woodworker's Chisel Bevel Rules (Q 3-53): Rough cuts made bevel down; smooth finishing cuts made bevel up.
18. Automatic Center Punch (Q 3-55): Catapunch (marks without a hammer).
19. Security-Controlled Tool (Q 4-18): Bolt cutters are classified as security items and must be secured.
20. Pipe Tap Taper Rate (Q 4-42): 3/4 inch per foot (American Standard NPT).
21. Reamer Rotation Rule (Q 4-55): Reamers must NEVER be turned counter-clockwise (prevents chipping).
22. Universal Gear Puller Capacity (Q 5-1): 0 to 14 inches diameter capacity.
23. Rescue Tool for Emergency Access (Q 5-19): Crash ax (insulated 20,000V handle with piercing pick).
24. Power Saw Contact Rule (Q 5-48): Circular saw must reach FULL SPEED before contacting the work surface.
25. Electric Hammer Feed Rule (Q 5-46): Apply LIGHT hand pressure only; place bit against work before pressing trigger.