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2. Pencil sharpener - Wikipedia

   en.wikipedia.org/wiki/Pencil_sharpener

   In 1833 in England, Cooper & Eckstein patented the so-called Styloxynon, a simple device consisting of two sharp files set together at right angle in a small block of rosewood. [6] [7] This is the oldest pencil sharpener that has surviving examples. [8]

3. Clamp holder - Wikipedia

   en.wikipedia.org/wiki/Clamp_holder

   Clamp holders can secure laboratory equipment at specific angles, diameters, and weights, as required. [3] Clamp holders are often used to hold the attached apparatus over a work surface. There are several different types of holders, such as swivel holders and all-position holders, that allow adjustments for different angles and planes. In some ...

4. Try square - Wikipedia

   en.wikipedia.org/wiki/Try_square

   A try square or try-square is a woodworking tool used for marking and checking 90° angles on pieces of wood. Though woodworkers use many different types of square, the try square is considered one of the essential tools for woodworking. [1] The square in the name refers to the 90° angle.

5. Tool bit - Wikipedia

   en.wikipedia.org/wiki/Tool_bit

   This tool was designed for a 2G Brown & Sharpe screw machine. A form tool is precision-ground into a pattern that resembles the part to be formed. The form tool can be used as a single operation and therefore eliminate many other operations from the slides (front, rear and/or vertical) and the turret, such as box tools. A form tool turns one or ...

6. Machine taper - Wikipedia

   en.wikipedia.org/wiki/Machine_taper

   The R8 system is commonly used with collets ranging in size from 1 ⁄ 8 ″ to 3 ⁄ 4 ″ in diameter or tool holders with the same or slightly larger diameters. The collets or tool holders are placed directly into the spindle and the drawbar is tightened into the top of the collet or tool holder from above the spindle.

7. Screwdriver - Wikipedia

   en.wikipedia.org/wiki/Screwdriver

   Variations include impact drivers, which provide two types of 'hammering' force for improved performance in certain situations, and "right-angle" drivers for use in tight spaces. Many options and enhancements, such as built-in bubble levels, high/low gear selection, magnetic screw holders, adjustable-torque clutches, keyless chucks, "gyroscopic ...