coil springs sideways motion
coil springs sideways motion
(OP)
Anybody have any info of the effect of sideway movement of an extension coil spring? Instead of being pin/hook connected on both ends, so that extension forces are along the axis of the spring, one end would be held fixed & the other hooked to an arm that sweeps through an arc. Kind of like using a spring as a cantilever beam.
Thanks!!
Arto





RE: coil springs sideways motion
RE: coil springs sideways motion
RE: coil springs sideways motion
{There's a picture of this in the old Maleev Machine Design Book [1946] p. 289: hook on one end, "threaded" plug screwed into the base end}
High Quality ArtoCAD:
o
[up ^ /
& | | arc of motion X [cL arm]
down]v \
o
Z [spring]
Z
Z
Z
___Z______
/////////
{I gotta figure out how to attach a picture ;) }
RE: coil springs sideways motion
It might be worth doing an FE model of this, I doubt that any simple calculation will be accurate for such a strange geometry. You will need to go to a non linear large deflection code, if you want to only build one model.
Cheers
Greg Locock
RE: coil springs sideways motion
The lateral stiffness of a coil spring is normally negligible, so that you shouldn't worry for this: but if the coil elongation is also small with respect to coil length and the diameter to length ratio of the spring is also small (in other words: normal), then you have a further reason to not worry.
prex
motori@xcalcsREMOVE.com
http://www.xcalcs.com
Online tools for structural design
RE: coil springs sideways motion
The extension motion is ~10" total [up & down] & the arm radius is ~33", so the sideways movement is ~0.4" total.
Thanks!
Arto
RE: coil springs sideways motion
Cheers
Greg Locock