equipped with automatic conveyors and augers which play a huge part in governing the head of material .
Angle of Attack : Here is the big one . Have you ever seen our friend “ Windmill Johnny ” on the paving crew ? He ’ s the guy who can ’ t take his hands off of the depth screw . He turns it one way , looks down the paver and turns it back the other way again and again . What is he accomplishing ? Absolutely nothing except putting ripples in the mat . Here ’ s the rule : No matter whose paver you are using , it takes 5 tow arm lengths to realize a change in depth . 65 % of the change occurs in the first tow arm length and the rest over the next 4 . I always look at Mr . Johnny and wonder , “ What does he see in the area to be paved that makes him think that he needs more depth ?” My rule of thumb is this – If there is no change in the base , speed of the paver or head of material , there is no reason to adjust the depth screw . Let the paver do its job .
Now , this is a condensed version of how a screed works , but I hope you get the picture . It ’ s all geometry and physics and has been the same since the first screed hit the market , just brighter logos and shinier paint . But it ’ s certainly not rocket science !
Brian Hall , LeeBoy Territory Manager . He can be reached via email at Brian . Hall @ Leeboy . com .
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November 2022