Had the spring been oriented in another direction (e.g., pushing straight down), the problem wouldn’t be nearly so bad.Ĭontent of this page is copyright 2005-2022 Exapta Solutions, Inc. Because the spring is nearly parallel to the swing-arm, it has almost no down-stroke-i.e., the spring is in the optimum position (applying the correct amount of downforce) for only about 0.25-inch of its range. While it’s true that a swing-arm isn’t as good as a parallel link, the worst issue with the 50/60/90 opener is actually the way that down-pressure is applied to it. Some will say that the swing-arm design, where the opener pivots from a single point (rather than a parallel link) is the worst downfall. Perhaps the worst downfall of these drills is the way that down-force is applied to the opener-the rockshaft twists to compress a big coil spring on each opener. Yet there are plenty of shortcomings with these drills, and Exapta has been busy addressing those. ![]() ![]() Many of you know that I view these drills as being superior to many others on the market because of: 1) depth gauging alongside the blade, 2) an in-furrow seed-lock wheel.
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