Craft And Design Questions 1

Explanation
A 3 jaw chuck or a three jaw chuck is a lathe cutting tool that is used to securely hold a workpiece in place while it is being machined. It has three adjustable jaws that can be tightened or loosened to grip the workpiece. When cutting a shorter piece of metal from a longer bar, the 3 jaw chuck can hold the bar in place and allow the lathe to remove the excess material, resulting in a shorter piece without the need to remove the bar from the chuck.

Explanation
The name of these tools is "pop rivet".

Explanation
The tool described in the question is called "odd-leg callipers." Odd-leg callipers are a measuring tool used to accurately measure distances and dimensions. They consist of two legs, one of which has a fixed end and the other can be adjusted. The adjustable leg allows for precise measurement of various objects by sliding it along the scale until it fits snugly. This tool is commonly used in engineering, woodworking, and metalworking industries for tasks such as marking, scribing, and measuring thickness.

Explanation
A sanding disk is a machine that can be used to sand off ends after they have been sawn. The disk is typically attached to a power tool, such as a sander or grinder, and rotates at high speeds to effectively remove material from the surface. By using a sanding disk, one can smooth out rough edges and achieve a more polished finish on the sawn ends.

Explanation
To cut an M6 thread into a blind hole, a taper tap is used. The taper tap is inserted into the hole and turned 1/4 of a turn forward to start cutting the thread. Then, it is turned back 1/2 of a turn to break the chips and clear the tap. Finally, a plug tap is used to finish off the thread, ensuring it is fully formed and clean. This process allows for the creation of an M6 thread in a blind hole, ensuring proper fit and functionality.

Explanation
The correct answer suggests the sequence of operations for preparing and painting metal. The first step is to clean the metal to remove any dirt, dust, or grease that may be present on its surface. This ensures that the paint adheres properly. Once the metal is clean, the next step is to prime it. Priming helps to create a smooth surface, improves paint adhesion, and provides protection against corrosion. Finally, after the primer has dried, the metal can be painted with the desired color. This sequence ensures that the metal is properly prepared and painted for a long-lasting and professional finish.

Explanation
Before switching on the drilling machine, two checks should be carried out. The first check is to make sure that the drill is securely tightened in the machine. This is important to ensure that the drill bit is properly attached and will not come loose during operation. The second check is to make sure that the visor is down. This is a safety measure to protect the operator's eyes from any flying debris or sparks that may be generated during drilling. By following these checks, the drilling machine can be operated safely and efficiently.