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Old 03-16-2000, 10:59 PM
GroundKprs GroundKprs is offline
LawnSite Bronze Member
Join Date: Dec 1999
Location: South Bend, IN
Posts: 1,969
True calibration is a two step process. First part is measuring as above to determine proper flow rate of product.<p>Hardest part is determining the proper broadcast pattern, i.e.: how is the product spread laterally. True calibration of a spreader requires placing collection pans about a foot apart across the path of your spreader, to determine the actual spread of the product. While it is very time consuming, it is the only way to be accurate. I have seen what appears visually to be an even spread on a flat surface, to really be applying 1/3 of product to left of spreader, and 2/3 to right. When calibrating a 1998 Lesco spreader with a friend, we found that it deposits way over a double dose of product in a 1 to 2 foot wide band just right of center. Few months later a golf magazine published same data, and Lesco came out with a fix last spring (change in gearing). So anyone using a Lesco over a year old, not having installed the retro kit, is doing the same thing. We could not get an even distribution with any of the hole settings.<br> <br>To calibrate spread, place collection pans across path about a foot apart, staggering in center so you can roll machine past them. Now make a number of passes, about 5 to 10 depending on quantity of product. We then pour each pan into a 3/4&quot;x6&quot; test tube held in a rack to simulate position of pans. The height of product in the tubes will show the pattern of distribution. Then you use spread adjustment mechanism on machine (hole with slider on Lesco), to change to get an even spread. [Unfortunately, when you change the hole, you also change the flow rate, so you now have to recalibrate that. That's why we use Spykers: the spread calibration is separate from the flow calibration.] Lesco used to sell a kit for this type of calibration; maybe still do.<p>When you have an even right to left distribution, then you look out on each side to the point(pan or tube) that product drops to 1/2 rate of middle, and that is your working spread width.<p><p><p>----------<br>Jim<br>North central Indiana
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