What is the use of gear tooth vernier caliper?

The Starrett 456 Gear Tooth Vernier Caliper is designed to measure in . 001″ or 0.02mm the thickness of gear teeth at the pitch line (the chordal thickness of the teeth) using the distance from the top of a tooth to the chord. For the same purpose, it can also be used for measuring hobs, form and thread tools, etc.

Which part has the movable job of gear tooth vernier caliper?

Vernier scale which slides on the main scale has a movable jaw which slides on frame. The movable jaw can be locked at any desired position with the help of locking screw. The work to be measured is kept between the jaws for measuring the outside dimensions.

How are gear teeth measured?

Tooth thickness : Arc distance measured along the pitch circle from its intercept with one flank to its intercept with other flank of the same tooth : Face of tooth : Part of the tooth surface whichis above the pitch surface.

How does the gear tooth vernier measure chordal thickness?

The gear tooth vernier is set with its vertical scale at a distance equal to chordal addendum so that the thin slit will be at a height ‘m’ from the tip of the jaw. Hence the gear tooth slit will sit on the top land and the tip of the jaws will measure the chordal thickness, t. 2 2 /2 2 /4 /2 hmh tAB AD AOD N N απ π =+ == ∠= = =

What can a 456 vernier caliper be used for?

The Starrett 456 Gear Tooth Vernier Caliper is designed to measure in.001″ or 0.02mm the thickness of gear teeth at the pitch line (the chordal thickness of the teeth) using the distance from the top of a tooth to the chord. For the same purpose, it can also be used for measuring hobs, form and thread tools, etc. 20-2 Diametral Pitch.

How big is a 456 gear tooth caliper?

Paste a list of item#s and quantities. The Starrett 456 Gear Tooth Vernier Caliper is designed to measure in .001″ or 0.02mm the thickness of gear teeth at the pitch line (the chordal thickness of the teeth) using the distance from the top of a tooth to the chord.

How does the sliding jaw work on a vernier caliper?

Working of Vernier Caliper. The sliding jaw runs on the main scale with the guiding surface, which is accompanied by a vernier scale, in which it has a measuring tip on the left side. When two measuring tip surfaces are in contact with each other, the scale shows zero reading. The finer adjustment of the movable jaw can be done by adjusting screw.

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