- #1
Benjibear
- 4
- 0
Hi there,
I am trying to work out the difference in force exerted by either a press or a power hammer.
I worked out that the kinetic energy of a hammer is calculated as E = ½mv².
Hammer: 0.5 * 30 kg * (15m/sec)sq = 3.375 KJ
How does this relate to the force exerted by a 20 ton press, where the momentum/velocity doesn't really matter that much, or does it, if it is only 0.01 m/s ?
0.5 * 20000 kg * (0.01m/sec)sq = 1 KJ
That doesn't make sense, does it ?
That press would surely move the metal as much as the 30kg hammer blow . . .
There must be another comparison between pressure and kinetic energy.
What about this relation : 1 tonne-force = 9806.65 N = 9807 joule/meter ?
So the 20 ton press would exert a force of 196.13 KJ/meter ?
Still doesn't seem right . . .
Can anyone help me with this ? It's been bothering me for ages.
Thanks, Benjamin
I am trying to work out the difference in force exerted by either a press or a power hammer.
I worked out that the kinetic energy of a hammer is calculated as E = ½mv².
Hammer: 0.5 * 30 kg * (15m/sec)sq = 3.375 KJ
How does this relate to the force exerted by a 20 ton press, where the momentum/velocity doesn't really matter that much, or does it, if it is only 0.01 m/s ?
0.5 * 20000 kg * (0.01m/sec)sq = 1 KJ
That doesn't make sense, does it ?
That press would surely move the metal as much as the 30kg hammer blow . . .
There must be another comparison between pressure and kinetic energy.
What about this relation : 1 tonne-force = 9806.65 N = 9807 joule/meter ?
So the 20 ton press would exert a force of 196.13 KJ/meter ?
Still doesn't seem right . . .
Can anyone help me with this ? It's been bothering me for ages.
Thanks, Benjamin