solex pneumatic comparator pdf
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Hi am Mohamed i would like to get details on solex pneumatic comparator pdf ..My friend Justin said solex pneumatic comparator pdf will be available here and now i am living at ......... and i last studied in the college/school ......... and now am doing ....i need help on ......etc
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#2

Pneumatic Comparators (Solex Gauge):
Principle:

It works on the principle of pressure difference generated by the air flow. Air is
supplied at constant pressure through the orifice and the air escapes in the form of jets
through a restricted space which exerts a back pressure. The variation in the back pressure is
then used to find the dimensions of a component.

Working:

As shown in Figure (a) the air is compressed in the compressor at high pressure which
is equal to Water head H. The excess air escapes in the form of bubbles.
Then the metric amount of air is passed through the orifice at the constant pressure.
Due to restricted area, at A1 position, the back pressure is generated by the head of water displaced in the manometer tube.
To determine the roundness of the job, the job is rotated along the jet axis, if no
variation in the pressure reading is obtained then we can say that the job is perfectly circular at position A1. Then the same procedure is repeated at various positions A2, A3, A4, position and
variation in the pressure reading is found out. Also the diameter is measured at position A1
corresponding to the portion against two jets and diameter is also measured at various position along the length of the bore

Any variation in the dimension changes the value of h, e.g. Change in dimension of 0.002 mm changes the value of h from 3 to 20 mm. Moderate and constant supply pressure is
required to have the high sensitivity of the instrument.

Advantages:
1. It is cheaper, simple to operate and the cost is low.
2. It is free from mechanical hysteresis and wear.
3. The magnification can be obtained as high as 10,000 X.
4. The gauging member is not in direct contact with the work.
5. Indicating and measuring is done at two different places.
6. Tapers and ovality can be easily detected.
7. The method is self cleaning due to continuous flow of air through the jets and this makes the method ideal to be used on shop floor for online controls.

Disadvantages:
1. They are very sensitive to temperature and humidity changes.
2. The accuracy may be influenced by the surface roughness of the component being checked.
3. Different gauging heads are needed for different jobs.
4. Auxiliary equipments such as air filters, pressure gauges and regulators are needed.
5. Non-uniformity of scale is a peculiar aspect of air gauging as the variation of back
pressure is linear, over only a small range of the orifice size variation.
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