Talyrond is a modular range of roundness measuring instruments that are highly accurate and reliable. It measures the roundness of components by collecting data at different orientations and using a mathematical model to determine the component's roundness profile. The Talyrond 73 was used to measure the diameter variation of cylinders at different heights and of a ring gauge at six heights and azimuths, demonstrating its ability to detect small differences in diameter. Plug and snap gauges are common tools to check features like holes and threads within specified tolerances, with plug gauges checking both the minimum and maximum size and snap gauges checking in a single motion.

1. Talyrond & PGC, RGC
Method
By
T. KARTHIKEYA-1005-19-765322
V. SAI SAMEER SARMA-1005-19-765323

2. EXPLAINATION
Talyrond is a modular range of roundness measuring instruments that are unsurpassed in accuracy
and reliability.They are offering the right balance of capability, automation and capacity for
virtually every application and budget.
In operation the component is placed on a rotary stage & data is collected at several orientations of
stage . A mathematical model, which relates the Fourier representations of the component errors
and spindle errors to those traces is then solved , the resulting of Fourier representation mentions
the roundness of component provide values of the component error at points around the
circumference.
• Use of the Talyrond 73 apparatus for the measurement of diameter variation of cylinders with
height ,by keeping constant the pick-up radius of the Talyrond 73 roundness measuring machine
through a series of records it is possible to obtain relative diameters at different heights of a
cylinder. Accuracy in diameter is of the order of 0.2 ym.
• Use of Talyrond 73 apparatus for the determination of diameter variation. Measurement of a ring
gauge at 6 heights and azimuths 1 to 6 o'clock (parameter). (a) and (6) are two sets of
measurements taken in reverse order with respect to height.

3. Comparison of graphs
Use of Talyrond 73 apparatus for the determination of diameter
variation. Measurement of a ring gauge at 6 heights and
azimuths 1 to 6 o'clock (parameter). (a) and (6) are two sets of
measurements taken in reverse order with respect to height .

4. Plug Gauge Center
These gauges are referred to as plug gauges; they are used in the manner of a plug. They are generally
assembled from standard parts, where the gauge portion is interchangeable with other gauge pieces
(obtained from a set of pin type and a body that uses the collet principle to hold the gauges firmly. To use
this style of gauge, one end is inserted into the part first, and depending on the result of that test, the
other end is tried.
The top gauge is a thread gauge that is screwed into the part to be tested, the "GO" end should fully enter
the part; the "NOT GO" end should not. The lower image is a plain plug gauge used to check the size of
a hole; the green end is the go, and the red end is the no-go. The tolerance of the part that this gauge
checks is 0.30 mm, where the lower size of the hole is 12.60 mm and the upper size is 12.90 mm, every
size outside this range is out of tolerance.

5. Snap Gauge Center
Snap gauges are often used when a large quantity of work pieces must be inspected. The snap gauge has
four anvils or jaws, the first one or pair (outermost) are set using the upper limit (tolerance) of the part
and the inner set adjusted to the lower limit of the part. A correctly machined part will pass the first set
of jaws and stop at the second end of test. In this manner, a part may be checked in one action, unlike the
plug gauge that needs to be used twice and flipped to access the second gauge. The first go/no-go snap
gauge for checking thread rolls was invented in 1943 to speed production of parts during WWII

6. Thank You