The effect of rip-kerf width on 5/4 Ponderosa pine cutting stock yield Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/tx31qm75j

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  • The moulding and millwork industry consumes large quantities of shop grade lumber which is becoming less plentiful and of a lower quality. This fact has compelled industry to explore the use of new technology to increase product yield. One prospect for increasing yield is the application of thin-kerf sawing technology. This research investigated the effect of rip-kerf width on 5/4 Ponderosa pine cutting stock yield by calculating the yields of two hundred and fifty boards in each of three lumber grades. Each board's yield was calculated using computer sawing simulation for each combination of nine rip-kerf widths, from 0.050 to 0.250 inches, and four cutting bills. Analysis of variance and regression techniques were used to determine the relationships between rip-kerf widths, cutting bills and percent yield. The results showed that reducing rip-kerf width by 0.050 inches will increase yield from a half to one percent, depending on the cutting bill, and that the narrower the maximum cutting bill width, and the more numerous and varied the other widths, the greater the yield increase. The results also indicated that the rate at which yield increases with reductions in rip-kerf width is the same for a specific cutting bill regardless which shop lumber grade is being sawn.
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