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3.4.1 – Creation of guide holes
For deep measurements, especially in EPS blocks with density higher than 10kg/m
it is necessary to create a guide hole. The hole must be made with the help of a solid
rod, capable of perforating the material without suffering deformations. A suggested
construction is shown in Picture 9:
The rod diameter should be approximately 6mm and the total length should be 50mm
shorter than the depth chosen for measurement. The use of a solid stainless steel rod is
recommended.
Insertion of the rod can be done manually or with mechanical assistance, such as
pneumatic actuators. In high density blocks, actuators are typically required, as the
insertion force becomes too much for manual work.
In large blocks it is recommended that the inspection be performed at different depths.
This allows the observation of possible variations of the fusion strength, typically caused
by heat loss during the expansion process. For this it is possible to build a tool, consisting
of multiple rods, as illustrated in Picture 9. Insertion into the material requires high force
and must be performed with automation, but allows the part to be quickly prepared for
the inspection process.
After the guide holes have been created, the needle should be inserted freely up to
near the measuring point. At this point, the operator should apply slight force to the final
perforation of the material (approximately 50mm wall), positioning the needle at the
intended measurement point.
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Picture 9 – Solid rod for creating a guide hole
Picture 10 – Tool for creating multiple guide holes
M20-EPS User Guide
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