Both incoming parts and tooling are inspected for accuracy. New gauges are set up for use in production while other gauges are changed and calibrated. Detailed inspections of shells from each machine are constantly made for visible flaws. The ceramic insulator contour can be checked by projecting its silhouette onto a screen at a magnification of 20 times actual size and matching the silhouette to tolerance lines. In addition, regular statistical inspections can be made on insulators coming off the production line.
During spark plug assembly, a random sampling are pressure tested to check that the center electrode is properly sealed inside the insulator. Visual inspections assure that assembly is in accordance with design specifications. Heywood, John.
Internal Combustion Engine Fundamentals. McGraw-Hill, Schwaller, Anthony. Motor Automotive Mechanics. Delmar Publishers, Davis, Marlan. February, October 17, May, Toggle navigation.
To make spark plugs, manufacturers first extrude or cold-form steel to the proper hollow shape 1. Periodicals Davis, Marlan. Other articles you might like:.
Also read article about Spark Plug from Wikipedia. User Contributions: 1. If a piece of spark plug ceramic was suspected of having 'fallen' into an engine combustion chamber, would it be ok to run the engine or would further inspection and removal be order of the day?
Comment about this article, ask questions, or add new information about this topic: Name:. E-mail: Show my email publicly. Human Verification:. This reminds you that when you look into a plug from above:. The plug The cable A mains electricity cable contains two or three inner wires. The inner wires are colour coded and have different functions: Colour Wire Function Brown Live Is held at a voltage of V and provides the current Blue Neutral Completes the circuit Green and yellow stripes Earth A safety wire to stop the appliance becoming live An earthed conductor cannot become live.
The wires In a plug, the blue neutral wire goes to the left, the brown live wire to the right and the green and yellow striped earth wire to the top. The diagram shows the key features of a three-pin mains plug: Where does each wire go? This reminds you that when you look into a plug from above: b l ue goes left b r own goes right s t riped goes to the top. Thermoplastics: Thermosetting and Thermosoftening Plastics. Plastic has various unique properties compared to other materials, and it is being used to increase the quality of our daily life.
We use plastic bags , nylon shirts, chairs, etc. Abdelatif Terlinden Pundit. Where is thermosetting plastic used? Thermoset plastics are traditionally used in products requiring stiffer and longer-lasting materials, such as computers, refrigerators, and electrical insulation. The strong crosslinks in these polymers generally decompose when heated to high temperatures, making the material almost impossible to recycle. Texenen Diekmannshemke Pundit. Can acrylic be recycled? Acrylic plastic is not recycled easily.
Among recycled plastics, it is considered as a Group 7 plastic and mostly not collected for recycling. It is possible to form large pieces into useful objects in case they have not suffered crazing, stress or cracking. These are not readily biodegradable. Bouamama Preuss Pundit. What are switches made out of? Earlier switches were made of porcelain in the surface-mounted version and operated as a rotary switch with a rotary mechanism.
Later, more durable Bakelite and Ebonite was used. Today they are made of modern plastics, like Polycarbonate or fire resistant ABS. Why are electrical switches plugs and sockets made of thermosetting plastics? Natacha Eusepi Pundit. Why is it important that the outer covering of the plug is made from plastic? Perhaps the most important reason why electrical wires are covered in plastic is to protect people from electrical shock.
Covering electrical wires in plastic guarantees that the electrons flowing through the wires will not flow through your body when the wire is touched. Kallie Mabrouki Teacher. Why are switches made of plastic and not metals? Switches are made up of plastics or bakelite and non metals because plastics are bad conductor of electricity so they will protect us from shock and metals are good conductor of electricity so they will produce shock to our body..
Susannah Benik Supporter. What is a momentary switch? Momentary switches may be normally open or normally closed. A normally open switch doesn't make contact until and unless it is held down.
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