Why Are We So Concerned With Static Deflection?
All the static deflection number tells us is that the beam will bend by a thousandth or two under no load. Why is that a big deal? We should be looking at the dynamic deflection under actual (varying) loads.
If we use the beam as a support for a rail (or for a metal support for a rail), we can just machine out the static deflection. We would still be left with the dynamic deflection, though.
So let's talk about the dynamic load and the deflection under that load. To do that, we need to know the mass of moving components and the forces (cutting and other) that act upon our beams.
Ken
Kenneth Lerman
55 Main Street
Newtown, CT 06470