- Die grinder
-
A die grinder is a handheld power tool used to grind, sand, hone, polish, or machine material, typically metal but also plastic or wood. They are usually pneumatically driven, although versions with electric and flexible shaft drive also exist. Their name comes from one of their earliest and archetypal applications, tool and die work, where they are used to create the precise contours of dies or molds. Especially before the advent of widespread CNC usage, they were heavily relied upon for contouring via manual skill comparable to a sculptor's. CNC now provides much of the contouring for die and mold interior surfaces, but die grinders are still very useful for hundreds of cutting needs, from sculpture-like contouring in the absence of CNC, to cut-off of bar stock, to any of the cutting and grinding needs of fabrication, such as in the work of welders, boilermakers, millwrights, ironworkers (steel erectors), sheet metal workers (such as auto body workers and HVAC technicians), to woodworking (especially cabinet making), hacking, and other hobby or business pursuits. Die grinders are often used for engraving, cylinder head porting, and general shaping of a part.[1]
Die grinders are very similar to rotary tools, and in fact some people do not make any distinction between them. The difference between a die grinder and a rotary tool is mainly one of mental classification rather than etic traits. Die grinders are thought of as industrial tools, whereas rotary tools are thought of as tools for the residential mass-consumer end-user. There is overlap, though, as many consumers own die grinders, and many industrial users have rotary tools. The distinction is not very significant. Die grinders may feature heavier construction (such as being made of die-cast metal rather than molded plastic) and higher top speeds for the spindle (some can exceed 30,000 RPM unloaded). All modern examples of what people call rotary tools have plastic bodies.
Contents
Methods of cutting action
The cutting may be done in various ways, including:
- Grinding with bonded abrasive stones (called by various names, such as mounted stones, mounted points, or grinding points)
- Machining with a burr or small drill bit or endmill
- Sanding with coated abrasive, such as small drums made of sandpaper mounted on an expanding rubber mandrel (also called an arbor)
- Honing with fine-grit mounted points
- Lapping with lapping compound and a mounted lap to embed it
- Polishing or buffing with cloth or fiber drums or flaps and polishing compound
Types of cutters
- Mounted stones of many shapes and various [small or medium] sizes (also called mounted points or grinding points)
- Burrs of many shapes and various [small or medium] sizes (also called rotary files)
- Small drill bits
- Small endmills
- Small disc-shaped saw blades or milling cutters
- Small abrasive cut-off wheels, which work like saw blades except via abrasive cutting rather than sawing per se
- Small sanding drums
- Small sanding flap wheels
- Small cloth or fiber wheels, drums, and flap wheels (for holding polishing compound)
- Mounted laps
Methods of holding the cutter
The cutter is usually held in a collet, which is a convenient means of chucking in this application and provides the concentricity needed for high-RPM use. It also allows for quick changes in cutters.[1][2] In some applications, other quick-change indexable chucking systems can be used, similar to the indexable chucking types now commonly found on consumer pistol-grip drills.
Safety
Personal protective equipment (PPE)
The most universal safety precaution in die grinder use is to protect one's eyes by wearing safety glasses.
Other common PPE in die grinder use includes:
- Other eye and face protection, such as safety goggles (basically "safety glasses with sides too") or a face shield, which is simply a polycarbonate window, hanging from a headband, between one's face and the work. All eye protectors come in clear versions as well as various levels of shading (for grinding that produces enough sparks to warrant shading, like torching or welding do).
- Hearing protection, such as ear plugs or headphones (die grinders are often quite loud, even just running unloaded, but even more so while cutting).
- Skin protection, such as work gloves (and in some special applications, fire-retardant clothing because of the sparks, although the sparks are usually harmless in most applications).
- Protection for the respiratory and alimentary tracts (mouth, throat, lungs, gut), such as simple paper masks or, in special applications, a respirator. Masks may be trivial in many applications but important in others. Any abrasive cutting generates dust, from both the abrasive itself and from the workpiece. Depending on the materials and amounts, masks may be needed.
Safety features built into the tool
Most pneumatic die grinder throttles (also called triggers) feature a spring-loaded "kickstand" mechanism between the throttle lever and the body of the grinder. This prevents the throttle from opening (being pressed down towards the body of the grinder) without operator intervention and inhibits accidental activation. It is similar in principle to the safety catches used on many handguns.
Tools with electric motors often have electrical safety features such as grounded cases (wired to a grounding conductor, which uses the grounding prong on a plug) or double insulation. Some may have both, but more often not, because regulatory requirements require only one or the other.
See also
References
- ^ a b Benford, Tom (2006), Garage and Workshop Gear Guide, MotorBooks/MBI Publishing, p. 87, ISBN 9780760323120, http://books.google.com/books?id=Db5Xdju1lAYC&pg=PA87.
- ^ Monroe, Tom (1996), Engine builder's handbook, HPBooks, p. 27, ISBN 9781557882455, http://books.google.com/books?id=Ro3_4pS_11cC&pg=PA27.
Types of tools Cleaning tools Broom · Brush · Feather duster · Floor buffer · Hataki · Ice resurfacer · Mop · Mop bucket cart · Office cleaning cart · Pipe cleaner · Pressure washer · Sponge · Squeegee · Steam mop · Tawashi · Vacuum cleanerCutting and
abrasive toolsBlade · Bolt cutter · Broach · Ceramic tile cutter · Chisel · Coping saw · Countersink · Diamond blade · Diamond tool · Draw knife · Drill bit · Emery cloth · File · Fretsaw · Froe · Glass cutter · Grater · Grinding wheel · Hand saw · Knife · Miter saw · Nail clipper · Pipecutter · Plane · Rasp · Razor · Reamer · Sandpaper · Saw · Scalpel · Scissors · Steel wool · Surform · Switchblade · Utility knife · Water jet cutter · Wire brush · Wire cutter · Wire stripperGarden tools Adze · Axe · Billhook · Bow saw · Chainsaw · Cultivator · Earth auger · Edger · Garden fork · Garden hose · Garden trowel · Hatchet · Hedge trimmer · Hoe · Hori hori · Irrigation sprinkler · Lawn aerator · Lawn mower · Lawn sweeper · Leaf blower · Loppers · Loy · Machete · Mattock · Pickaxe · Pitchfork · Plough (plow) · Post hole digger · Pruning shears (secateurs) · Rake · Roller · Rotary tiller · Scythe · Shovel · Sickle · Slasher · Spade · Splitting maul · String trimmerHand tools Block plane · BNC inserter/remover · Brace · Bradawl · Breaker bar · Card scraper · Cat's paw · Caulking gun · Clamp · Crimping pliers · Crowbar · Grease gun · Fish tape · Hammer · Hand truck · Hawk · Hex key · Jack · Lug wrench · Locking pliers · Mallet · Mitre box · Monkey wrench · Nut driver · Paint roller · Paintbrush · Pipe wrench · Pliers · Plumber's snake · Plunger · Punch · Punch down tool · Putty knife · Ratchet · Sink wrench · Scratch awl · Screwdriver · Sledgehammer · Socket wrench · Spike maul · Staple gun · Stitching awl · Strap wrench · Tire iron · Torque wrench · Trowel · Upholstery hammer · Wrench (spanner)Machine and
metalworking toolsAutomatic lathe · Ball-peen hammer · Broaching machine · Drill press · Endmill · English wheel · Gear shaper · Grinding machine · Hacksaw · Hobbing machine · Jig borer · Lathe · Metalworking lathe · Milling cutter · Milling machine · Planer · Plasma cutter · Screw machine · Shaper · Tap and die · Thread restorer · Tool bit · Turret lathe · WelderMeasuring and
alignment toolsArchitect's scale · Beam compass · Caliper · Chalk box · Compass · Engineer's scale · Flexible curve · Jig · Laser level · Laser line level · Laser measuring tool · Micrometer · Plumb-bob · Protractor · Ruler · Scale · Sliding T bevel · Spirit level · Square · Straightedge · Tape measure · TemplatePower tools Angle grinder · Bandsaw · Belt sander · Blow torch · Chop saw · Circular saw · Concrete saw · Crusher · Cutting torch · Die grinder · Drill · Glue gun · Heat gun · Impact wrench · Jackhammer · Jigsaw · Jointer · Nail gun · Needlegun scaler · Power trowel · Radial arm saw · Random orbital sander · Reciprocating saw · Rotary tool · Router table · Sander · Scroll saw · Soldering gun · Soldering iron · Steam box · Table saw · Thickness planer · Wood router · Wood shaperOther Antique tools · Backscratcher · Bucket · Comb · Flashlight · Halligan bar · Kelly tool · Ladder · Pencil · Toolbox · Vise · WorkbenchCategories:- Grinding and lapping
- Metalworking hand tools
- Hand-held power tools
Wikimedia Foundation. 2010.