![]() These are made of mild steel, and their points are case-hardened. With a little pressure, we can increase or decrease the distance between these two legs. It has one leg straight, which is a guiding edge, and the other is a scribe point that is bent inward about 1/8″ to 1/4″.īoth legs are joined with a rivet or a spring. It usually has two legs with different purposes. These tools assist in inscribing parallel marks on metal or plastic. This marking tool is also known as Jenny Caliper or Hermaphrodite Caliper. To measure a job with a Dial Test Indicator.Used to measure or mark the angle of a job with the help of a sine bar.To measure the smoothness of the job with the main surface of the surface plate.Its surface is almost leveled, and through scraping, it gives its true form. After molding and seasoning, it is cut or scratched on the planner machine according to the size. Also, there are ribs on the inside of the plates, which make them stronger.Ĭonsiderable care is required for making surface plate. For convenience use, there are two handles are provided on opposite sides of the plate. Their upper surface has a fine finish, which may contain 10% to 20% high spots. These plates are made of close grain-cast iron and are kept outside for at least a year for seasoning purposes. The surface plate is either rectangular or circular, just like the marking table. The following are used for different markings, according to drawings:Ī surface plate is used for jobs that require exact marking. Read Also: Definitions & Terms Applicable to Mechanical Measurements Types of Marking Tools For the different kinds of workpieces, different types of marking tools are required.The place at which drilling is to be done should be marked with a center punch.Before making the marking permanent through dot-punching, the marking lines should be checked once again.Only correct and genuine tools should be used for marking.According to the measurement, the required tools should be kept ready in advance. ![]()
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