Good Connections Magazine

5 GOOD CONNECTIONS | Summer 2019 Jeff Gee, Sr. SoLware Developer Based in Grand Prairie, Texas, he is a member of the plant management scrum team. Crown up and lumber width: Stocking lumber so that the natural bow in the material is going in the upward direcŸon on top and bo© om cords is called crowning. This is done so that when the truss is set, the cords deflect to a flat posiŸon rather than to a negaŸve bow. The Crown-Up funcŸon in the Alpine ALS 4.0 Linear Saw eliminates the flipping of parts in the opŸmizaŸon process to insure all boards cut have the same crown direcŸon. When using the crown-up funcŸonality in Alpine's ALS 4.0 Linear Saw there are many Ÿmes when the longest point is flipped away from the fence. When this happens, the lumber width affects the overall length of the part. This is because the bo© om of the part is now against the fence. In the example below, the overall length of the part varies by ±3/16" (Table 2) when the thickness varies by ±1/16". Lumber thickness In general lumber thickness will not affect part length. The excepŸon occurs when cu« ng back bevels. Double bevels have the largest effect. The saw makes cut calculaŸons based on the thickness of lumber specified in cut file. In our example there is a variaŸon of ±1/4" in the overall length. Eased edges The lumber standards do not menŸon a tolerance for easing the edge of a board. (Figure 1: eased on two sides) Easing may vary by mill. Easing will affect the overall length on parts with a double bevel cut. When cu« ng a double bevel on an eased edge, the overall length can be up to 9/16" shorter than called out. ConŸnued from page 4 Example 2 Table 2 Table 4 Figure 1 Example 3 Table 3 conŸnued on page 6 Example 4

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