diff --git a/pygears/computation.py b/pygears/computation.py
index 1bdc1f6..f63aefb 100644
--- a/pygears/computation.py
+++ b/pygears/computation.py
@@ -1,13 +1,12 @@
 import numpy as np
 from scipy import optimize as opt
 
-def computeShiftedGears(m, alpha, beta, t1, t2, x1=0, x2=0):
+def computeShiftedGears(m, alpha, t1, t2, x1, x2):
     """Summary
     
     Args:
         m (float): common module of both gears [length]
         alpha (float): pressure-angle [rad]
-        beta (float): helical angle [rad]
         t1 (int): number of teeth of gear1
         t2 (int): number of teeth of gear2
         x1 (float): relative profile-shift of gear1
@@ -16,10 +15,9 @@ def computeShiftedGears(m, alpha, beta, t1, t2, x1=0, x2=0):
     Returns:
         (float, float): distance between gears [length], pressure angle of the assembly [rad]
     """
-    m_t = m / no.cos(beta)
     inv = lambda x: np.tan(x) - x
     inv_alpha_w = inv(alpha) + 2 * np.tan(alpha) * (x1 + x2) / (t1 + t2)
     root_inv = lambda x: inv(x) - inv_alpha_w
     alpha_w = opt.fsolve(root_inv, 0.)
     dist = m * (t1+ t2) / 2 * np.cos(alpha) / np.cos(alpha_w)
-    return dist, alpha_w
+    return dist, alpha_w
\ No newline at end of file