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Spockie-Tech
Site Admin
Joined: 31 May 2004
Posts: 3160
Location: Melbourne, Australia
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In simple terms, regardless of how the mechanism is constructed, all you need to do is compare the distance travelled by the ram with the distance travelled by the hammer, and take the ratio of them.
So if your ram has a total travel of 100mm and your mechanism turns that into 500mm of travel, then you have a 1:5 ratio, and your effective force at the hammer head will be reduced by 5.
any time you turn a small amount of travel into a large one, force is reduced. when you turn a large amount of travel into a small amount then force is increased.
It gets more complicated after that, with the angles and force vectors having to be taken into account, and then how they vary as the linkage mechanisms travel through their arc's.
For example Mite-E-Er had a problem in that the ram was exerting most of its force trying to push the frame apart when the lid was down, and only really started pushing in the right direction once the lid was all the way up (which is a bit late in a flipper).
Ballistic and Toro you will notice have the ram mounted in such a way that all the force is in the direction of desired travel rather than at 90 degrees to it.
In your case, you would need to take into account the distance from the pivot to the ram attachment point, AND the distance from the pivot to the end-effector (hammer) and work out that ratio.. but its probably just easier to get the ratio of their travel if I havent had a brain-fart here.. _________________ Great minds discuss ideas. Average minds discuss events. Small minds discuss people
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Tue Jan 18, 2005 12:08 am |
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