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The higher the firing temperature, the denser is the product obtained, but a higher firing temperature necessitates a longer firing time, which in turn results in an accelerated grain growth. Hence, it becomes essential to use grain growth inhibitors such as MgO. Porosity and therefore density have a considerable influence on tool life. The lower the porosity, the higher is the tool life. Oxide ceramics retain their hardness at higher temperatures as compared with other materials. Ceramics have a very low tensile strength of 370–600 N/mm 2 .
During polymerisation, there is 14% shrinkage of the plastic material. To accommodate the dimensional shape, the mould consists of two pieces forming the front and back Fig. 17: An optical jacket used for making plastic lenses . Precision Engineering 21 surfaces of the lens. These pieces are held together with a pliable gasket material. For typical ophthalmic lenses, the mould surfaces are spherical or toroidal in shape and are readily made using conventional methods, which are known to be quick and inexpensive.
A train of gears provides the required relative motion between the cutter shaft and the gear-blank shaft. 9. In the gear shaving process, a cutter, which is shaped exactly as the finished tooth profile, removes small amounts of material from the gear teeth. The cutter teeth are slotted or gashed at several points along its width, and the motion of the cutter is such that it reciprocates. It is recommended that shaving can 14 Precision Engineering Fig. 8: A schematic illustration of gear generation in a gear shaper using a pinion shaped cutter, which reciprocates vertically .