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Describe, with reference to the diagrams, the main operating features of any one of the following: Strip heater Worm and wheel mechanism Box and pan folding machine. - Leaving Cert Engineering - Question i - 2013
Question i
Describe, with reference to the diagrams, the main operating features of any one of the following: Strip heater Worm and wheel mechanism Box and pan folding machi... show full transcript
Worked Solution & Example Answer:Describe, with reference to the diagrams, the main operating features of any one of the following: Strip heater Worm and wheel mechanism Box and pan folding machine. - Leaving Cert Engineering - Question i - 2013
Step 1
Strip heater
Answer
A strip heater is a device designed to form straight or small curved bends in thermoplastic sheet material. It operates by having an electric element or hot wire enclosed in a channel that has an opening at the top.
The essential operating feature of a strip heater is its ability to heat a thermoplastic sheet efficiently. The strip of material is placed across supports above the heating element, allowing the area directly above to be heated. By adjusting the height of these supports, the depth of the section being heated can be controlled.
When a more gradual bend is required, the area is widened by adjusting the supports higher. The machine can also accommodate different thicknesses of the sheet material, and the heating temperature is regulated by a thermostat, ensuring precise temperature control that is crucial for the thermoplastic forming process.
Step 2
Worm and wheel mechanism
Answer
The worm and wheel mechanism consists of two gears; a worm gear, which is a screw-like part, and a wheel, which is generally a spur gear. The operating principle of this mechanism involves the worm driving the wheel, enabling rotational movement.
When the worm is rotated, it engages with the wheel, causing it to turn. This mechanism typically allows for a significant reduction in speed and an increase in torque, making it effective for various applications. One important feature is that it can also enable locking; if the wheel attempts to turn and the worm is not rotating, the system will hold the position securely, preventing back drive.
Step 3
Box and pan folding machine
Answer
A box and pan folding machine is used for forming and bending sheet metal, particularly light gauge materials. It typically consists of an upper jaw that can be adjusted to accommodate different material thicknesses and bending radii.
The key operating feature of this machine is the mechanism that allows the user to adjust the bending angle and height of the lower jaw. The lower jaw is fixed and supports the sheet metal when the upper jaw is lowered, forming the clamped material to the required angle. This capability allows for precision in manufacturing various components from sheet metal, making it a valuable tool in metalworking.