Mechanical tools

MECHANICAL TOOLS

LENGTH MEASUREMENT

When we measure an object,we are actually comparing it with a known standard of measurement.

The base unit of length as per SI is the METER.

Length-SI UNIT and MULTIPLES.

TRY SQUARE : The try square is a precision instrument which is used to check squareness (angles 90 degree) of a surface.

The accuracy by a try square is about 0.002 mm  try per 10 mm length, which is accurate enough for most workshop purposes. The try square has a blade with parallel surfaces. the blade is fixed to the stock at 90 degree.

Uses of try squares

• used for check squareness of machined or filled surfaces.
• check flatness of surfaces
• mark lines at 90 degree to the edges of work-pieces 

JENNY CALIPERS : Jenny calipers are used for making and layout work.

these calipers are also known as hermaphrodite calipers, odd leg calipers, and point calipers.

jenny calipers have one leg with an adjustable divider point, while the other is bent leg. the legs are joined together to make a firm joint.

Uses :  Jenny calipers are used for making lines parallel to inside and out side edges and for  locating the center of round bars. 

these calipers are available with the usual bent leg or with a heel. the calipers, with ordinary bent legs, are used for drawings lines parallel along an inside edge, and the heel type is used for drawing parallel lines along outer edges. 

jenny calipers are also be used for scribing lines along curved edges. while setting dimensions and scribing lines, both legs are should be equal length.