function flexRET_eval(tilt_ref)

%tilt_ref = 3356
tilt_min = 4000;
unload_steps = 560;

tilt_target_distance = tilt_min - unload_steps
 
tooth_steps = 360/14*4

k = fix(tilt_target_distance / tooth_steps + 0.5)
tilt_min_raster = fix(tilt_ref + k*tooth_steps + 0.5)

probe = (tilt_min_raster-tilt_ref) / tooth_steps