Front wood?s lenght experimental assignment at wood roof scissors knot points

In this study front wood length?s affect to the shearing stretching at single geared assembly prepared from second class scotch pine was searched. Experiment was carried out on 10 pieces stretcher entrance which have 30*50*170 mm dimensions and 50 mm front wood length, 10 pieces stretcher entrance which have 30*50*170 mm dimensions and 40 mm front wood lenght,10 pieces stretcher entrance which have 30*50*170 mm dimensions and 30 mm front wood length and 30 pieces sideway samples which have 30*30*145 mm dimensions by miniaturizing 1/5 their real dimensions in accordance with TS 2470. Samples are subject to experiment. As a result cutting stretching was determined with experimental method, required front wood length was found.