Residual stress measurement and stress calculation services

Hole drilling

Our current drilling devices are miniature, PC-controlled, 3-axis machines which may be pre-programmed to drill the hole with an orbital motion :

This cutting action reduces the heat output during drilling and results in better strain output stability. Reduced cutter wear enables the hole drilling method to be applied to harder materials using conventional tungsten carbide cutters (for example, nitrided surfaces).

A diamond impregnated inverted cone cutter may be used to extend the hole drilling method to glass and ceramic components.

The long-term reliability of residual stress results from Stresscraft is brought about by the consistent use of all the following component parts :

rigorous experimental and gauge installation procedures,
specialised strain gauge rosettes,
specialised tungsten carbide burs driven by medium-speed motors,
highly controllable hole drilling machines,
pre-determined drilling and calculation increments,
proven strain-to-stress software using the ‘integral method',
an effective quality management system.

Additional components extend the use of the hole drilling method into more difficult conditions :

alternative / adaptable strain rosette layouts,
alternative drill formats (materials, shapes, lengths),
a set of adaptable drilling heads for use in locations of restricted access,
adaptable software for addressing different drilling and calculation depths,

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