Fig. 1- Portable electric hand drills - Taladros manuales portátiles eléctricos
Fig. 2 - Portable pneumatic hand drills - Taladros manuales portátiles neumáticos
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- Milwaukee Super Hawg Electric Drill - 1/2in., 1750 RPM, 13 Amp Model# 1680-20
$369.99
Powerful Super Hawg 13 Amp drill with Milwaukee-built motor is perfect for drilling holes of all sizes in wood frame construction. Low speed clutch. Fast drilling with 1750 RPM high; 450 RPM low. 3-position Roto-Lok rear handle with 90 left-right rotation. Amps: 13, Chuck Size (in.): 1/2, Speed (RPM): 1, 750, Cord Length (ft.): 8, Side Handle: Yes, Keyless Chuck: No, Variable Speed: Yes [Read more]
Store: Northern Tool and Equipment
Brand: Milwaukee
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Tanaka Gas-Powered Drill - 1.3 HP, 1/2in. Chuck, Reverse Lever, Model# TED-270PFR
$549.99
HP: 1.3, Engine Displacement (cu. in. (cc)): 26, Rated RPM: 0 - 450, Chuck Size (in.): 1/2, Gear Ratio: 20:1 2-cycle engine (50:1 gas/oil ratio) Reverse lever Recoil start; electronic ignition Chrome-plated cylinder Forged steel connecting rod Walbro diaphragm carburetor with primer Heavy-duty centrifugal clutch system CARB Tier II and EPA Phase 2 compliant [Read more]
Store: Northern Tool and Equipment
Brand: Tanaka
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Tanaka Gas-Powered Drill - 1.3 HP, 1/2in. Chuck, Locking, Model# TED-262L
$469.99
HP: 1.3, Engine Displacement (cu. in. (cc)): 26, Rated RPM: 0 - 450, Chuck Size (in.): 1/2, Gear Ratio: 20:1 2-cycle engine (50:1 gas/oil ratio) Features a locking mechanism for manually backing out a bit Recoil start; electronic ignition Chrome-plated cylinder Forged steel connecting rod Walbro diaphragm carburetor with primer Heavy-duty centrifugal clutch system CARB Tier II and EPA Phase 2 compliant [Read more]
Store: Northern Tool and Equipment
Brand: Tanaka
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- Makita LXT Lithium-Ion Hammer Drill/Driver Kit - 18V, 1/2in., Model# BHP451
$339.99
LXT Lithium-Ion battery and optimum charging system produces 280% total lifetime work with 2x more cycles. Compact design at only 9 7/8in. length and weighs only 4.9 lbs. for less operator fatigue. Cordless: Yes, Volts: 18, Rated RPM: 0 - 1, 700, Variable Speed: Yes, Torque (in./lbs.): 560, Hammering Modes: Hammering Only, Hammering with Rotation, Chuck Size (in.): 1/2, Tool Length (in.): 9 7/8, Tool Weight (lbs.): 4.9, Battery Included: (2) 18V LXT Lithium, Charger Included: Yes, 45 Minute, Case Included: Yes 1/2in. chuck size 18 Volt LXT Lithium-Ion battery Makita-built, 4-pole maximum torque motor delivers 560in.-lbs. of efficient torque in a compact size Ergonomic shape fits like a glove with even pressure and easy control LXT Lithium-Ion provides longer run time, 5x lower self-discharge (for use any time) and 16 firm holding contact terminals (for constant high power) 45-minute Optimum Charger uses Active 3 Control for current control, thermal control & voltage control Optimum Charger has a built-in fan to cool the battery to produce more lifetime work Two built-in LED lights for more illuminated work 3-speed design (0-300/0-600/0-1700) produces 25% faster working speed with more efficiency in a wider range of applications Shift-Lock drive system quickly shifts from hammer drill to driver mode with one touch 2-pc. armature and field along with externally accessible brushes for serviceability and longer motor life [Read more]
Store: Northern Tool and Equipment
Brand: Makita
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Irwin Unibit #1 High Speed Steel Fractional Self-Starting/Hole Enlarging Step Drill Bit, Model# 10231
$21.99
SpeedPoint tip geometry penetrates stainless steel 6 times faster than before. Single-flute design minimizes vibration and controls progression through the drilling steps. U.S.A. Includes (qty.): 1, Hole Size Range: 1/8 to 1/2 in., Increments (in.): 1/32, Steps: 13 Ideal for drilling holes into thin materials (1/8in. max.) such as stainless steel, copper, brass, aluminum, plastic and laminates New SpeedPoint tip penetrates faster than previous Unibits and prevents walking Single-flute cutting edge for greater control through steps 3 flatted shank prevents slipping in drill chuck Model 10231 [Read more]
Store: Northern Tool and Equipment
Brand: Irwin
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Milwaukee Electric Tools MLW0370-20 Drill Electric 0.375 Inch 0-
$173.52
the 0370-20 close quarter angle drill provides a unique chuck angle for reaching into tight areas. its large paddle trigger and textured grip area provides comfort and control in all positions. the angled cord exit keeps the cord out of the work area. the convenient forward/reverse lever is easy to use in close quarters. metal framed gear train for longer gear life. large paddle trigger for smooth control and easy grip in any position. angled chuck for reaching close quarters other drills cannot reach. textured palm grip reduces slipping. voltage: 120 ac. chuck size: 3/8 in. amps: 3.5. no load speed: 0-1, 300 rpm. chuck type: keyed. spindle: 1/2 in.-20. gear train : double. cord type : 8 ft. fixed. construction type: double insulated . spindle lock : no. soft grip handle: yes. length: 11 in. includes chuck key with holder milwaukee electric tools 48-01-5162 metal scrolling 14tpi sawzall saw blade 5/pkmilwaukee electric tools 6517-20 17-1/2in. var speed 7.5 amp electric sawzall sawmilwaukee electric tools 49-56-0055 4/6 super-tough bi-metal hole saw 1-3/16in.milwaukee electric tool 617620 - 14" chop / cut off saw w/ quick release locking visemilwaukee electric tool 0824-24 v18 (18 volt) 1/2 in. hammer-drill kitmilwaukee electric tool 6180-20 - 14 inch. abrasive cut off sawmilwaukee electric tool 2401-22 - sub-compact cordless driver drill, 12vmilwaukee electric tool 48-32-0221 - 21 piece power screw driving setnew message [Read more]
Store: UnbeatableSale.com
Brand: Milwaukee Electric Tools
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Milwaukee Electric Tools MLW49-56-8000 1/8in. High Speed Pilot Drill
$14.55
features and benefits:for use with saw arbors mlw49-56-6950 mlw49-56-7000 mlw49-56-7055 mlw49-56-7130 and mlw49-56-7140for general cutting of wood and metal [Read more]
Store: UnbeatableSale.com
Brand: Milwaukee Electric Tools
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Milwaukee Electric Tools MLW2610-20 M18 .5 Inch Drill Driver- Bare
$184.94
Milwaukee Electric Tools MLW2610-20 M18 .5 Inch Drill Driver- Bare Tool [Read more]
Store: UnbeatableSale.com
Brand: Milwaukee Electric Tools
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Milwaukee Electric Tools MLW2410-20 M12 3-8 Inch Drill Driver- Bare
$121.49
Milwaukee Electric Tools MLW2410-20 M12 3-8 Inch Drill Driver- Bare Tool [Read more]
Store: UnbeatableSale.com
Brand: Milwaukee Electric Tools
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Milwaukee Electric Tools MLW2601-20 M18 .5 Inch Drill Driver- Bare Too
$134.99
Milwaukee Electric Tools MLW2601-20 M18 .5 Inch Drill Driver- Bare Too [Read more]
Store: UnbeatableSale.com
Brand: Milwaukee Electric Tools
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Milwaukee Electric Tools MLW2415-20 M12 3-8 Inch Right Angle Drill-
$130.94
Milwaukee Electric Tools MLW2415-20 M12 3-8 Inch Right Angle Drill- Bare Tool [Read more]
Store: UnbeatableSale.com
Brand: Milwaukee Electric Tools
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Milwaukee Electric Tools MLW49-56-8010 1/8in. High Speed Pilot Drill
$14.87
features and benefits:for use with hole saw saw arbors mlw49-56-7010 and mlw49-56-7150for general cutting of wood and metalone per package [Read more]
Store: UnbeatableSale.com
Brand: Milwaukee Electric Tools
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Milwaukee Electric Tool MLW0370-20 .38" Close Quarter Angle Drill
$173.52
metal framed gear train for longer gear lifelarge paddle trigger for smooth control and easy grip in any positionangled chuck for reaching close quarters other drills cannot reachtextured palm grip reduces slipping120vchuck size- 3/8 in.3.5 amps1300 rpm [Read more]
Store: UnbeatableSale.com
Brand: Milwaukee Electric Tool
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Milwaukee Electric Tools MLW48-89-4431 Shockwave 7Pc Hex Drill Bit Set
$26.99
Milwaukee Electric Tools MLW48-89-4431 Shockwave 7Pc Hex Drill Bit Set [Read more]
Store: UnbeatableSale.com
Brand: Milwaukee Electric Tools
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Milwaukee Electric Tools MLW2415-21 M12 Right Anlge Drill
$171.44
Milwaukee Electric Tools MLW2415-21 M12 Right Anlge Drill [Read more]
Store: UnbeatableSale.com
Brand: Milwaukee Electric Tools
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Makita MAK6302H 1/2 Inch Pistol Grip Electric Drill
$171.56
features and benefits: powerful 6.5 amp motor variable speed (0-550 rpm) compact and lightweight (4.8lbs) large and conveniently located reversing switch and lock-on button side handle can be attached to either side of the tool for better controlincludes the following: drill chuck chuck key and side handle. [Read more]
Store: UnbeatableSale.com
Brand: Makita
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Drill Doctor Titanium-Coated Drill Bits - 13-Pc. Set, Model# PP70102ZF
$13.99
Titanium nitride-coated steel bits in sizes 1/16in. to 1/4in. and stored in an indexed, rotating cylindrical storage container. Includes (qty.): 13, Material: Steel, titanium, Diameter (in.): 1/16in. - 1/4in., Case Included: Yes Titanium nitride coating (TiN) for reduced wear and longer drill bit life 118 standard point drill bits Cylindrical storage container has bit sizes clearly marked [Read more]
Store: Northern Tool and Equipment
Brand: Drill Doctor
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- Drill Doctor Diamond Sharpening Wheel - 100-Grit, Model# DA31325GF
$24.99
Replacement sharpening wheel for use with Item#s 1560920, 1560930 and 1560960. [Read more]
Store: Northern Tool and Equipment
Brand: Drill Doctor
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- Milwaukee Electric Drill - 1 1/4in., 250 RPM, 10 Amp, Model# 2404-1
$629.99
The tool mans dream, the Super Hole Shooter has the most handheld power available. From turning the largest bits into steel to powering grain augers or other equipment that requires portable power, the Super Hole Shooter line of drills can handle it. U.S.A. Amps: 10, Chuck Size (in.): 1 1/4, Speed (RPM): 250, Side Handle: Yes, Keyless Chuck: No, Variable Speed: No, Case Included: No 1 1/4in. capacity in steel For drilling holes of all sizes in wood frame construction #3 Morse taper socket Reversing Triple gear reduction transmits more torque Extra-long switch handle and pipe handle afford maximum leverage for drilling and reaming large holes [Read more]
Store: Northern Tool and Equipment
Brand: Milwaukee
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- Milwaukee Reconditioned Magnum Drill - 1/2in. Chuck, 8 Amp Motor, Model# 0299-80
$79.99
This powerful drill has the construction and performance you need to get the job done. This Milwaukee Drill is factory reconditioned to perform like new. NorthernTool.com offers reconditioned tools and equipment that are equal to the standards and quality of new products, yet give you the same features at considerable savings. Service Protection Plan available. Amps: 8, Chuck Size (in.): 1/2, Speed (RPM): 0 - 850, Cord Length (ft.): 8, Side Handle: Yes, Keyless Chuck: No, Variable Speed: Yes, Case Included: No [Read more]
Store: Northern Tool and Equipment
Brand: Milwaukee
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Therefore, a 1/4-inch-capacity drill is capable of drilling a 1/4-inch diameter hole or smaller in steel. Portable electric and pneumatic drills rated at 1/4 to 1/2-inch maximum capacities are usually equipped with geared drill chucks for mounting straight, round shank twist drills or other similar tools by using a chuck key (Figure 3). Heavier portable drills (Figure 4) having a 3/4- to 1 1/4-inch capacity use taper shank chucks to mount drills and other similar tools.
Fig. 3 - Geared drill chuck and chuck key. - Cabezal portabroca o mandril dentado y llave de ajuste de mandril.
Portable drills have many different characteristics (Figure 5) depending on how the job is to be done. They may be set for one speed or they maybe variable speed drills. A variable speed drill is an excellent tool for use as a power screwdriver.
Portable drills may be equipped with a reversing switch to allow a screwdriver attachment to reverse bolts and screws out of holes. Special 90° angle portable drills (Figure 8) are available for drilling in confined spaces where a standard size drill will not have sufficient clearance. For corners and tight spots, a 360° angle portable pneumatic drill (Figure 2) is available which can be swiveled to any desired angle and locked into position. Most portable drills have a lock button near the on-off switch which allows for continuous operation without holding the trigger. Side handles and rear spade handles (Figure 5) can be attached to most drills to stabilize drilling and to allow for better control. Special devices, such as a vertical stand (Figure 6) or feed screw (Figure 7), can be used on some of the portable drills to make a job easier or more proficient.
Fig. 5 - Common portable drill - Taladro portátil común
The size, type, and power capacity of portable drills selected depends on the job to be performed. Before attempting a drilling job, check the capabilities of the portable drill with the manufacturer's instruction manual .
Fig. 7 - Operation of the portable drill showing the use of the feed screw - Operación del taladro portátil mostrando el uso del tornillo de accionamiento de avance
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Por lo tanto, un taladro ¼ pulgadas de capacidad es capaz de perforar un agujero de ¼ pulgada de diámetro o más pequeño en acero. Los taladros eléctricos y neumáticos portátiles clasificados en ¼ a ½ de pulgada de capacidades máximas son generalmente equipados con manguitos porta broca dentados para el montaje de brocas rectas, de espiga redonda u otras herramientas similares usando una llave de mandril (figura 3). Taladros portátiles más pesados (figura 4) que tienen capacidades de ¾ - a 1 ¼ pulgadas usan espiga de forma cónica para montar las brocas y otras herramientas similares.
Fig. 4 - 1 inch capacity portable electric drill - Taladro eléctrico portátil de 1 pulgada de capacidad.
Los taladros portátiles tienen diversas características (figura 5) dependiendo de cómo debe ser hecho el trabajo. Pueden ser ajustados para una velocidad o pueden ser taladros de velocidad variable. Un taladro de velocidad variable es una herramienta excelente para su uso como destornillador eléctrico.
Los taladros portátiles se pueden equipar con un interruptor de inversión para permitir que un accesorio del destornillador destornille pernos y tornillos de los agujeros. Taladros portátiles especiales de 90° de ángulo (figura 8) están disponibles para perforar dentro de espacios confinados donde un taladro de tamaño estándar no tendrá suficiente espacio. Para las esquinas y puntos con poco margen, un taladro neumático portátil de 360° de ángulo (figura 2) está disponible para que se pueda hacer girar sobre un eje a cualquier ángulo deseado y ser trabado en una posición. La mayoría de los taladros portátiles tienen un botón de traba cerca del interruptor de encendido-apagado que permite una operación continua sin accionar el disparador. Los mangos laterales y mangos posteriores tipo espada (figura 5) se pueden fijar a la mayoría de los taladros para estabilizar la perforación y para disponer de un mejor control. Los dispositivos especiales, tales como el soporte vertical (figura 6) o eje de avance (cuadro 7), se pueden utilizar en algunos de los taladros portátiles para hacer un trabajo más fácil o más eficiente.
Fig. 6 - Portable electric drill with vertical stand - Taladro eléctrico portátil con soporte vertical
El tamaño, el tipo, y la capacidad eléctrica de los taladros portátiles seleccionados dependen del trabajo a ser realizado. Antes de intentar un trabajo de perforación, compruebe las capacidades del taladro portátil con el manual de instrucciones del fabricante.
Fig. - Hand drilling operation in confined space using the 90° angle drill - Operación de taladrado manual en espacios estrechos usando el taladro angular de 90° |
DRILLING OPERATIONS
Operation of the portable electric and pneumatic drills differs from recommended operating procedures for the upright drilling machine. The portable drill is hand supported for most operations, and the cutting speed of the drill is fixed or dependent upon the operator to control. When hand supported, the drill must be carefully aligned with the workpiece (Figure 9) and this alignment must be maintained throughout the drilling operation. Care must be taken not to lose control of the portable drill and allow it to be wrenched from the operator's hands. The larger portable drills (Figure 10) can be very dangerous if not held firmly by the operator.
Fig. 9 - Drilling with portable drill - Perforando con taladro portátil
If the cutting speed is fixed, the operator must learn to control the feed of the portable drill by applying sufficient pressure for the drill to cut, but not too much pressure as to cause overheating of the twist drill or stalling of the portable drill motor.
When metal is to be drilled with the portable drill, the workpiece must be prepared by locating the center position of the potential hole and marking the location with a center punch. When a large drill is to be used, it will be necessary first to drill a pilot hole slightly larger in diameter than the thickness of the larger drill's web, which will allow for the drag caused by the larger drill's chisel edge (Figure 11).
Fig. 11 - Drilling a pilot hole for a larger drill - Perforando un agujero piloto para una mecha mas grande.
Portable pneumatic drills require special attention to lubricate their internal moving parts. Each drill may be made slightly different, so refer to the pertinent lubrication order or manufacturer's instruction manual before drilling.
For drilling by hand, the workpiece must be mounted securely. Thin workpieces should be backed up with a thicker piece of wood or metal to prevent the drill from snagging in the workpiece. Do not attempt to hold any workpiece by hand or serious injury could result.
Select a twist drill of the proper size for the hole to be drilled. Ensure that the twist drill selected has the right type of shank for the type of chuck mounted on the portable drill.
Taper shank drills cannot be mounted in a drill with a geared chuck. Check each twist drill for sharp cutting edges prior to use.
After securing the twist drill in the proper chuck, connect the portable drill to its power source. Position the portable drill perpendicular to the workpiece and center the chisel point of the drill in the center-punched hole of the workpiece.
Apply firm but not too heavy pressure upon the portable drill, pull the trigger or throttle button to start the drill.
Apply a few drops of cutting oil to the twist drill and hole (Figure 3-12) to improve the cutting action and prevent overheating of the twist drill. For long drilling operations, stop the drill and allow it to cool; then apply additional cutting oil to the drilling area. The lock button can be engaged for lengthy cutting operations.
Continue drilling the hole while applying enough pressure to produce a clean chip, but not so much pressure as to cause the motor to strain or the drill to bind. The drill must be held firmly at all times to prevent the drill from being wrenched from the hands of the operator if the flutes of the drill should snag on a metal burr in the hole.
As the twist drill nears the back wall of the workpiece, release the lock button so that the drill can be stopped immediately if required. Decrease the feed pressure as the drill breaks through, and cautiously feed the drill through the wall of the workpiece. If the drill should snag on a burr, stop drilling immediately and withdraw from the hole. Carefully feed the drill back into the hole while the drill is turning to cut through the burr.
When a portable drill is mounted to a vertical stand, the operating procedure is identical to that used for the upright drilling machine. Use the lock button while drilling and use the hand lever to drill to the required depth.
Portable drilling operations can be difficult to an inexperienced operator. It is difficult to keep the twist drill perpendicular to the workpiece during drilling, and it is hard to drill to a desired depth accurately. If help is available, use the buddy system to keep the drill aligned while drilling. To drill to depth, mark the twist drill with a light colored marking pen or a strip of tape and keep a close watch on the drill as it cuts. Another way to drill to depth accurately using the portable drill is to use a jig, such as a piece of metal pipe or tubing cut to length, to indicate when the drill has reached the desired depth.
Fig. 12 - Drilling lubrication, correct and incorrect - Lubricación de perforación, correcta e incorrecta. |
OPERACIONES DE PERFORACIÓN
La operación de los taladros eléctricos y neumáticos portátiles difiere de los procedimientos de funcionamiento recomendados para una perforadora vertical. El taladro portátil es soportado a mano para la mayoría de las operaciones, y la velocidad de corte del taladro es fija o dependiente del control del operador. Cuando se soporta a mano, el taladro debe alinearse cuidadosamente con la pieza de trabajo (figura 9) y esta alineación debe mantenerse a lo largo de la operación de perforación. Se debe tener cuidado de no perder el control del taladro portátil para no permitir que se tuerza en las manos del operador. Los taladros portátiles más grandes (figra 10) pueden ser muy peligrosos si no se sostienen firmemente por el operador.
Fig. 10 - Drilling with a large portable drill - Perforando con un taladro de gran tamaño
Si la velocidad del corte es fija, el operador debe aprender a controlar la alimentación del taladro portátil aplicando la suficiente presión para que el taladro corte, pero no demasiada presión que cause un recalentamiento del taladro de mecha helicoidal o el atasco del motor portátil del taladro.
Cuando el metal debe ser perforado con el taladro portátil, la pieza de trabajo debe ser preparada ubicando la posición central del agujero en cuestión y marcando la localización con un punzón central. Cuando un taladro grande debe ser utilizado, será necesario primero perforar un agujero piloto levemente más grande en diámetro que el grueso del filo de mecha más grande, que permitirá que se produzca la fricción causada por el borde biselado de la broca más grande (figura 11).
Los taladros neumáticos portátiles requieren especial atención para lubricar sus piezas móviles internas. Cada taladro puede hacerse ligeramente diferente, por lo tanto refiérase a la orden correspondiente de instrucciones o al manual de lubricación del fabricante antes de perforar.
Para perforar a mano, el objeto se debe montar con seguridad. Las piezas de trabajo finas se deben sostener con un pedazo más grueso de madera o de metal para evitar el desrebabado de taladro en el objeto. No intente sostener ningún objeto a mano o una lesión seria podría resultar.
Seleccione un taladro de broca helicoidal del tamaño apropiado para que el agujero sea perforado. Asegúrese de que el taladro seleccionado tenga el tipo correcto de espiga para el tipo de mandril montado en el taladro portátil.
Los taladros de espiga de forma cónica no se pueden montar en un taladro con un mandril de engranajes. Compruebe el filo de cada mecha helicoidal antes de su uso.
Después de asegurar la mecha helicoidal adentro del mandril apropiado, conecte el taladro portátil a su fuente de energía. Coloque el taladro portátil perpendicular al objeto de trabajo y centre el punto biselado de la mecha en el agujero de centrado perforado en el objeto. Aplique una presión firme pero no excesiva sobre el taladro portátil, tire del botón del disparador o del botón de traba para encender el taladro.
Aplique algunas gotas de lubricante para cuchillas a la mecha helicoidal y al agujero (figura 3-12) para mejorar la acción de corte y para prevenir el recalentamiento de la mecha. Para las operaciones largas de perforación, pare el taladro y permita que se enfríe; luego aplique lubricante para cuchillas adicional al área de la perforación. El botón de bloqueo se puede accionar para operaciones muy largas de corte.
Continúe perforando el agujero mientras que aplica bastante presión para producir una viruta limpia, pero no tanta presión para hacer que el motor se sobrecargue o que la mecha se doble. El taladro se debe mantener firmemente siempre, para evitar que el mismo se desprenda de las manos del operador si las ranuras de la mecha se encastraran en las rebabas del metal en el agujero.
A medida que la mecha helicoidal se acerca a la pared trasera del objeto de trabajo, libere el botón de bloqueo para poder parar el taladro inmediatamente si es necesario. Disminuya la presión del proceso de taladrado a medida que la mecha pasa, y accione cautelosamente el taladro a través de la pared del objeto. Si el taladro se encastra en las rebabas, pare el perforar inmediatamente y retírese del agujero. Cuidadosamente inicie el proceso de taladrado nuevamente dentro del agujero mientras que la mecha está girando para cortar a través de las rebabas.
Cuando un taladro portátil se monta sobre un soporte vertical, el procedimiento de funcionamiento es idéntico a aquel usado para la perforadora vertical. Utilice el botón de bloqueo mientras que perfora y utilice la palanca de mano para perforar a la profundidad requerida.
Las operaciones de perforación con taladro portátil pueden ser difíciles para un operador inexperto. Es difícil mantener la mecha helicoidal perpendicular al objeto durante la perforación, y es difícil perforar a una profundidad deseada con precisión. Si la ayuda está disponible, recurra a un ayudante para mantener el taladro alineado mientras se perfora. Para perforar en profundidad, marque la mecha helicoidal con un marcador de color claro o un trozo de cinta y mantenga estrecha vigilancia al taladro a medida que corta. Otra manera de perforar en profundidad con precisión usando un taladro portátil es utilizar una plantilla, tal como un pedazo de cañería o de tubería de metal cortada a medida, para indicar cuando el taladro ha alcanzado la profundidad deseada.
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