Plug Gauges
PLUG
GAUGES
The ends are hardened
and accurately finished by grinding. One end is the GO end and the other end is
NOGO end. Usually, the GO end will be equal to the lower limit size of the hole
and the NOGO end will be equal to the upper limit size of the hole.
If the size of the hole
is within the limits, the GO end should go inside the hole and NOGO end should
not go. If the GO end and does not go, the hole is under size and also if NOGO
end goes, the hole is over size. Hence, the components are rejected in both the
cases.
In this type, the GO
end and NOGO end are arranged on both the ends of the plug. This type has the
advantage of easy handling
2. Progressive type of
plug gauges
In this type both the
GO end and NOGO end are arranged in the same side of the plug. We can use the
plug gauge ends progressively one after the other while checking the hole. It
saves time. Generally, the GO end is made larger than the NOGO end in plug
gauges.
TAPER
PLUG GAUGE
Taper
plug gauges are used to check tapered holes. It has two check lines. One is a
GO line and another is a NOGO line. During the checking of work, NOGO line
remains outside the whole and GO line remain inside the hole. They are various
types taper plug gauges are available as shown in fig. Such as
1) Taper plug gauge
—plain
2) Taper plug gauge
—tanged.
3) Taper ring gauge plain
4) Taper ring gauge —
tanged.
