# Chrono link forces output

Does anyone notice or know why the link (spring) forces are all zero in ChronoLink_forces.csv? As only the heave motion is allowed, I assume there would be non-zero force in z-direction.

examples\chrono\10_PointAbsorber\CasePointAbsorberSpring

Another observation about hinge: since only x- and z-direction motions are allowed in 2D simulation, I suspect the hinge force in y-direction fy should be zero. The results for Pelamis case showed instead fz = 0 for all hinge links, Link_Link_arm0_arm1, etc.

examples\chrono\04_Pelamis

## Comments

@jmdalonso and @imartinezestevez can help here

I can't help but I have noticed the same thing as well. If sliding vector is set to z=1 (x,y=0) I get fx=0 like hfchen20 mentioned above. If I change the sliding vector to allow surge (ie sliding vector x=1), I get fx=0 (as you would normally expect) and fz looks about right:

@jmdalonso and @imartinezestevez any insights into this issue?

Bump! Still trying to resolve this if anyone has any ideas?