Experimental Analysis of . . . Saw Tooth Stresses and Deflection

Both brittle lacquer and photo-elastic techniques were used to determine design data for a stiff sawtooth with good stress distribution. A lateral load was applied and the corresponding saw tip deflections were measured. The maximum value of the lateral stress occurred at the lower front of the conventional Australian tooth profile and stress was reduced in the area by reinforcement. Such reinforcement also reduced deflection when the location of maximum stress was moved closer to the tip. The “denture a coupeau projete” design showed undesirable stress concentrations, while the “denture perroquet” design showed better stress distribution. Both normal and parallel stresses were about three times greater for the “denture a coupeau projete” profile than the conventional profile. From the viewpoint of stress due to combined loads the “denture perroquet” was the most favorable design. Because of excellent stress distribution and stiffness the “denture perroquet” design is widely used in Australian woodworking industries.

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