Do You Need Chipping?Unlike hammer drills, which offer a choice between rotation-only car and hammer-drill modes only, SDS-plus rotary hammers offer a third option: a hammer-only mode that permits the use of chisels, pointing tools, and other general purpose heater bits. Spline and SDS-max tools drop the rotation-only mode but allow the user to choose between hammer-drill and hammer-only. Hammer-only mode is great for tasks like removing tile, cleaning up concrete forms, and removing brick or stucco. thermostat Even though the rotary hammer won''t replace a demolition hammer, this mode is handy for light demo and greatly increases the tool''s versatility.

Damage to a specimen, or to the air scribe itself, can occur in several ways. Almost always it is due to operator error. The air scribe is very powerful and quite capable of quickly boring into mineralized bone or shell--with dire consequences. The reciprocating, or in-and-out, movement of the tool can actually pull the bit through the specimen in a series of millisecond-long bites that can leave the operator in a panic. The secret is to completely familiarize yourself with surface texture, color, and physical properties of both the fossil and the matrix--these are unique and vary greatly between specimens. Let the machine do the work. Knowledge of texture and color lets you know when to lighten up and pull away, and, for the most part, the movement of the chisel tip without any help except guidance from the operator is sufficient to reduce matrix to a fine debris. This is perhaps the most difficult technique to learn because it is human nature to think that force from our own muscles will make the job faster. Quite the contrary, the application of too much pressure only ensures that your lab will be filled with an incessant whining, your air scribe life span will be considerably reduced, and you may snap off fairly expensive chisel bits. In addition, because car air scribes are so powerful, the bit should never be used as a lever. It is the reciprocating movement of the tip of the bit that effectively breaks apart the rock matrix. Wedging the bit into the rock, twisting, or levering off larger chunks not only breaks chisel bits, but also rapidly transforms your air scribe into a useless paperweight. With proper care, common sense, and regular lubrication, a pneumatic air scribe will last for years and will enable you to prepare fossils from nearly any matrix. Lab technicians are also finding that air scribes enable them to develop fossils in a way never before available to them, bringing out details of specimens impossible with older, more traditional technologies.

The 1/2 inch Drive Air Impact Wrench from Snap-on Tools Company comes equipped with a new ergonomically, designed handle, larger selector knob and muffler bypass system. The system allows the user to run the impact wrench in either quiet or open mode. A chemical-resistant Santoprene handle helps protect the technician''s hand from heat and vibration when the impact wrench is being used. Snap-on Tools Company The new one-half inch Drive Impact Wrench (CT3450) from Snap-on Tools Company is a powerful cord-free impact wrench. The wrench''s increased power comes from its larger impact mechanism, while the 14.4-volt battery, which is housed in a powerful high-capacity pack, provides longer running time. The Drive Impact Wrench is cord-free, allowing automotive technicians to move around the workshop to remove most auto lug nuts without having to plug and unplug air hoses or extension cords. The wrench also has a motor and heavy-duty switch that changes the wrench''s speed for different jobs. This new RC2261 1/2-in, impact wrench has been introduced by American Rodcraft. It boasts a maximum torque of 600 ft. lbs. in reverse, and 450 ft. lbs. in forward.

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