TAPER PLUG/ RING GAUGE

Taper gauge is used to check taper ratio of tapered hole or shaft.

Generally comprised of a taper plug gauge and a taper ring gauge, the connected pair forms a standard gauge.

However, this gauge can also be manufactured with a notch in order to identify this product's standard stopping

position on the end face.

How to use taper gauges

For inspecting tapered products by taper gauge. Generally the inspection of the tapered hole is done at the base

of the standard line of the large end of the taper plug gauge or at the end face of the taper plug gauge.

The inspection of the taper shaft is generally done at the small end of the end face.

Pass or fail is determined by the amount of deviation from the hole of the product or end face of the shaft.

In addition, the taper is inspected by contact.

To conduct the inspection by contact, apply a light coat of Prussian blue or light cinnabar evenly on the surface of

the plug, and insert it in the tapered hole, then turn the plug a little and remove.

As good contact of taper the applied blue or light cinnabar is removed from the gauge.

Furthermore to perform satisfactory inspection of contact, the following precautions should be noted.

①Clean the gauge and product well, removing any accumulated dust.

②Apply Prussian blue or light cinnabar evenly over the gauge. It is necessary to apply it thoroughly before it

changes into a lighter color.

③Be careful to avoid scraping the gauge and product against each other or putting the gauge in only halfway.

④Under normal conditions, hold or anchor the plug in an upright position, then tug the ring about 1/8 while

pressing down lightly with even force, then replace it.

⑤Separate the gauge and product gently. Be careful not to scrape this time as well.

Contact can also be used for between gauge inspections.