Gauges

• Gauges are inspection tool of rigid design, without a scale,which serves to check the dimensions of         manufacturing parts.

• Gauge do not indicate the actual value of the inspected part of the component.

• They are used to determine whether the part is made within the specified limit.

                                        Classification of Plain Gauge

• Plain gauges are used for checking plain (unthreaded) holes and shafts. Gauges are classified:

• According to their type :

(a) Standard gauges- made as an exact copy of opposed(mating)part

(b) Limit gauges- made to the limits of the dimensions

• According to their purposes :

(a) Workshop Gauge: To Check Dimension after manufacture

(b) Inspection Gauge: To check part before final acceptance

(d) Purchase Inspection Gauge: To check part of other factory

(c) Reference or master gauges: To check the dimension of gauge

                               Classification of Plain Gauge

• According to the form of the tested surface :

(a) Plug gauges for checking holes.

(b) Snap and ring gauges for checking shafts

According to their design :

(a) Single limit and double limit gauges

(b) Single ended and double ended gauges,

(c) Fixed and adjustable gauges

                                                  Limit Gauge

• Limit gauges are made to the limits of the dimensions of the part to be tested. There are two limit of dimensions, so we need two limit gauge.

• ‘Go gauge’ should pass through or over a part while ‘Not Go gauge’should not pass through or over the part.