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#1
Posted to rec.crafts.metalworking,sci.engr.joining.welding,rec.woodworking
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PICTURE -- Big vs. small impact wrench
Without naming names,I think that many of us can benefit from reading
the wikipedia article on impacts. The torque applied to the bolt is the same, averaged over time, as the torque transmitted to the operator. The key is AVERAGED. The torque applied to bolts is HUGE but for short periods of time, and then zero for much longer periods etween blows. Because the impact is heavy, and is held in soft hands, the torque on operator hands is much more continuous and, on average, not that huge. Example: forget impacts at all. Suppose that I pound a steel plate with a sledgehammer. The force on the plate may be equivalent to several tons, but it is very intermittent. Force that is acting on my body is much more continuous and is never more than a few dozen pounds of force. i |
#2
Posted to rec.crafts.metalworking,sci.engr.joining.welding,rec.woodworking
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PICTURE -- Big vs. small impact wrench
"Ignoramus29659" wrote in message ... Without naming names,I think that many of us can benefit from reading the wikipedia article on impacts. The torque applied to the bolt is the same, averaged over time, as the torque transmitted to the operator. The key is AVERAGED. The torque applied to bolts is HUGE but for short periods of time, and then zero for much longer periods etween blows. Because the impact is heavy, and is held in soft hands, the torque on operator hands is much more continuous and, on average, not that huge. Example: forget impacts at all. Suppose that I pound a steel plate with a sledgehammer. The force on the plate may be equivalent to several tons, but it is very intermittent. Force that is acting on my body is much more continuous and is never more than a few dozen pounds of force. In all seriousness, you should get your hands on a large impact and have your wife film the event. You will "look" like a he-man, then let your wife operate the tool and you do the filming. Don't show that one to your buddies. ;~) |
#3
Posted to rec.crafts.metalworking,sci.engr.joining.welding,rec.woodworking
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PICTURE -- Big vs. small impact wrench
"Leon" wrote in message ... In all seriousness, you should get your hands on a large impact and have your wife film the event. You will "look" like a he-man, then let your wife operate the tool and you do the filming. Don't show that one to your buddies. ;~) Might I add, be sure to actually have the impact doing work vs. just spinning up. |
#4
Posted to rec.crafts.metalworking,sci.engr.joining.welding,rec.woodworking
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PICTURE -- Big vs. small impact wrench
On Jun 14, 11:07*am, "Leon" wrote:
"Leon" wrote in message ... In all seriousness, you should get your hands on a large impact and have your wife film the event. *You will "look" like a he-man, then let your wife operate the tool and you do the filming. *Don't show that one to your buddies. *;~) Might I add, be sure to actually have the impact doing work vs. just spinning up. Interesting thread. The REALLY big bolts, are never tightened with an impact wrench. The two halves of a steam turbine casing in power generation (hundreds of thousands of horse-power) are held together with bolts. They are tightened by hand. Really. Just a small 2-3 foot spanner. No impact nonsense. Some bolts on the high pressure side are 3" to 4" in diameter x anywhere to 18" to 24" long. Tightened by hand. Un-done by hand. But there is a trick to it. A hole, in the middle of the bolt, runs length-wise and is about 3/4" in diameter. Therein lies the magic. Also, those bolts are polished at the ends, which are very flat... for yet another reason. But alas, I said too much already... oooweeeeooooo rrrrrr |
#5
Posted to rec.crafts.metalworking,sci.engr.joining.welding,rec.woodworking
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PICTURE -- Big vs. small impact wrench
In article ,
Robatoy wrote: ...snipped... The REALLY big bolts, are never tightened with an impact wrench. The two halves of a steam turbine casing in power generation (hundreds of thousands of horse-power) are held together with bolts. They are tightened by hand. Really. Just a small 2-3 foot spanner. No impact nonsense. Some bolts on the high pressure side are 3" to 4" in diameter x anywhere to 18" to 24" long. Tightened by hand. Un-done by hand. But there is a trick to it. A hole, in the middle of the bolt, runs length-wise and is about 3/4" in diameter. Therein lies the magic. Also, those bolts are polished at the ends, which are very flat... for yet another reason. But alas, I said too much already... Yes, the same setup is often used on ship engines, for example to attach the cylinder head to the cylinder. -- Often wrong, never in doubt. Larry Wasserman - Baltimore Maryland - lwasserm(a)sdf. lonestar. org |
#6
Posted to rec.crafts.metalworking,sci.engr.joining.welding,rec.woodworking
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PICTURE -- Big vs. small impact wrench
On Jun 15, 9:55*am, (Larry W) wrote:
In article ,Robatoy wrote: ...snipped... The REALLY big bolts, are never tightened with an impact wrench. The two halves of a steam turbine casing in power generation (hundreds of thousands of horse-power) are held together with bolts. They are tightened by hand. Really. Just a small 2-3 foot spanner. No impact nonsense. Some bolts on the high pressure side are 3" to 4" in diameter x anywhere to 18" to 24" long. Tightened by hand. Un-done by hand. But there is a trick to it. A hole, in the middle of the bolt, runs length-wise and is about 3/4" in diameter. Therein lies the magic. Also, those bolts are polished at the ends, which are very flat... for yet another reason. But alas, I said too much already... Yes, the same setup is often used on ship engines, for example to attach the cylinder head to the cylinder. Indeed. Often without any form of gasket. |
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