Snap Gauges
SNAP
GAUGE
Snap
gauges are used for checking external dimensions. They are also called as gap
gauges. The different types of snap gauges are:
1. Double Ended Snap
Gauge
This
gauge is having two ends in the form of anvils. Here also, the GO anvil is made
to lower limit and NOGO anvil is made to upper limit of the shaft. It is also
known as solid snap gauges.
2. Progressive Snap
Gauge
This
type of snap gauge is also called caliper gauge. It is mainly used for checking
large diameters up to 100mm. Both GO and NOGO anvils at the same end. The GO
anvil should be at the front and NOGO anvil at the rear. So, the diameter of
the shaft is checked progressively by these two ends. This type of gauge is
made of horse shoe shaped frame with I section to reduce the weight of
the snap gauges.
3. Adjustable Snap
Gauge
Adjustable
snap gauges are used for checking large size shafts made with horseshoe shaped
frame of I section. It has one fixed anvil and two small adjustable
anvils. The distance between the two anvils is adjusted by adjusting the
adjustable anvils by means of setscrews. This adjustment can be made with the
help of slip gauges for specified limits of size.
4. Combined Limit
Gauges
A
spherical projection is provided with GO and NOGO dimension marked in a single
gauge. While using GO gauge the handle is parallel to axes of the hole and
normal to axes for NOGO gauge.
5. Position Gauge
It
is designed for checking the position of features in relation to another
surface. Other types of gauges are also available such as contour gauges,
receiver gauges, profile gauges etc.
