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Measuring Perpendicularity and Parallelism of Pipe End Faces Using Micro Alignment Telescope


Checking connecting end faces of tubes and pipes is extremely important in the civil engineering industry. The Micro Alignment Telescope is ideal for this type of application as it is robust, portable and does not require any power to measure the perpendicularity and parallelism of pipe end faces accurately.

The Taylor Hobson’s Micro Alignment Telescope equipment/tool is designed to allow the operator to quickly and accurately measure the perpendicularity (out of squareness) and parallelism of connecting pipe and tube end faces.


Perpendicularity and Parallelism Measuremnet of Pipes End Faces Using Micro Alignment Telescope

Method of Checking Pipes Perpendicularity (Out of Squareness) & Parallelism

First the Micro Alignment Telescope is aligned through two spider fixtures – one at the front and the other at the rear of the pipe to form the datum line to determine the perpendicularity and parallelism of pipe or tube end faces. The spider fixture is an adjustable target holder which allows the operator to put the centre of a glass target in the centre of the bore.

  • Out of Squareness Measurement at Pipe First End Face

In position one, the Micro Alignment Telescope is sighting through the centre line of the tube or pipe. An optical square, mounted to the Micro Alignment Telescope, allows the operator to view at right angles to the Micro Alignment Telescope optical line within 1 second of arc.  A scale on a magnetic base is placed on the end face of the pipe. The optical square and Micro Alignment Telescope are rotated about the optical line to measure the out-of-squareness at various positions around the end face.

Position1:

Out of Squareness Measurement at First Face of Pipe

Out of Squareness Measurement

Out of Squareness Measurement - Perpendicularity of Pipe End Faces

  • Out of Squareness Measurement at Pipe Second End Face

The Micro Alignment Telescope is then moved to position 2 and sighted through the two spider fixtures again, i.e. along the same datum line. The optical square is again used to look at the out-of-squareness on the second end face.

Position2:

Out of Squareness Measurement of Second Face of Pipe

     

  • Parallelism Measurement at Pipe End Faces

Not only have the end faces has been measured for squareness to the centre of the pipe, but as the same datum line is used in position 1 and 2 the end faces are measured parallel to each other.

Various versions of this application theme include using two matched targets on the outside of the pipe as the reference line, or even a target on a sledge pulled through the tube.




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