Features of surface gauges
. constructional features of surface gauges
. name the types of surface gauges
. uses of the surface gauges
. advantage of universal surface gauges
The surface gauge is one of the most common marking tools used forScribing line's parallel to datum surface
Setting jobs on machines parallel to a datum surface
Checking the height and parallesim of jobs, setting jobs concentric to the machine spindle
Types of surface gauges
Surface gauges/scribing blocks are of two types, fixed and universal
Surface gauge-fixed type
The fixed type of surface gauges consists of a heavy flat base and a spindle, fixed upright, to which a scriber is attached with a snug and a clamp nut.
Universal surface gauge
This has the following additional features
The spindle can be set to any position
Fine adjustment can be made quickly.
Parallel lines can be scribed from any datum edge with the help of guide pins.
Parts and function of a universal surface gauge
Base
The base is made of steel or cast iron with a "v" groove at the bottom. The "v" groove helps to seat on circular work. The guide-pins, fitted in the base, are helpful for scribing lines from any datum edge.
Rocker arm
The rocker arm is attached to the base along with a spring and a fine adjustment screw. This is used for fine adjustment.
Spindle
The spindle is attached to the rocker arm
Scriber
The scriber can be clamped in any position on the spindle with the help of a snug and a clamping nut.
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