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540 rpm?
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<blockquote data-quote="greybeard" data-source="post: 1528095" data-attributes="member: 18945"><p>This.</p><p>Newton's First Law. 'An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.'</p><p></p><p>The rotating mass of the blades and hub turns into a de facto flywheel that stores the energy, instead of relying on a second to second timeline dependence of the pto shaft's HP. Some mowers are better at it than others. As Dash said, the pto rpm too low really puts a load on the tractor, AND, is also hard on the gearbox(es). You really want to use the torque and energy that is built up in the rotating mass below the gearbox, instead of having the gearbox take the brunt of every thing the forage or brush throws at it. </p><p></p><p>I had to explain to one of my neighbors, the importance of keeping his 6' mower rpm up just last week, after he sheared his 3rd shear pin in as many hours, cutting thick grass and some goatweed. It was a chore to get his pto shaft off the gearbox the 3rd time, as the ujoint hub had galled the shaft badly. He actually thought it a case of his 50hp tractor being 'too powerful' for his 6' mower. </p><p>operator error.</p><p></p><p>50 rpm can make a LOT of difference to those blades. The difference between trying to push the edge of a machete thru a cornstalk and raring back and hitting the stalk with a good swing. </p><p></p><p></p><p>Do you 'have' to run it 540? No, but that depends on travel speed, what you're cutting, and how good your mower is designed and the gear ratio of the gearbox. Well designed mowers are designed to take advantage and use the kinetic energy as part of the hp/torque equation.</p></blockquote><p></p>
[QUOTE="greybeard, post: 1528095, member: 18945"] This. Newton's First Law. 'An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.' The rotating mass of the blades and hub turns into a de facto flywheel that stores the energy, instead of relying on a second to second timeline dependence of the pto shaft's HP. Some mowers are better at it than others. As Dash said, the pto rpm too low really puts a load on the tractor, AND, is also hard on the gearbox(es). You really want to use the torque and energy that is built up in the rotating mass below the gearbox, instead of having the gearbox take the brunt of every thing the forage or brush throws at it. I had to explain to one of my neighbors, the importance of keeping his 6' mower rpm up just last week, after he sheared his 3rd shear pin in as many hours, cutting thick grass and some goatweed. It was a chore to get his pto shaft off the gearbox the 3rd time, as the ujoint hub had galled the shaft badly. He actually thought it a case of his 50hp tractor being 'too powerful' for his 6' mower. operator error. 50 rpm can make a LOT of difference to those blades. The difference between trying to push the edge of a machete thru a cornstalk and raring back and hitting the stalk with a good swing. Do you 'have' to run it 540? No, but that depends on travel speed, what you're cutting, and how good your mower is designed and the gear ratio of the gearbox. Well designed mowers are designed to take advantage and use the kinetic energy as part of the hp/torque equation. [/QUOTE]
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