Gear rack with helical teeth

tandheugel schuine vertanding

Teeth number of the pinion = z1
Teeth number of the rack = zcImage114
Transverse or apparent module = mt = Image119
Normal module = mn = mt.cosβ = Image120
Transverse or apparant pitch in mm = pt = mt.p = Image121
Normal pitch in mm = pn = mn.p = pt.cosβ
Normal base pitch in mm = pbn = pt.cosa.cosβ
Addendum in mm = ha = m
Dedendum in mm = hf = 1,16m (a=14°30’)
= hf = 1,25m (a=20°)
Tooth depth in mm = h = ha + hf = 2,16m of 2,25m
Facewidth in mm = b = 10.mn
Rim thickness below the tooth in mm = H = h(normal)
Length of the rack in mm = Lc = zc.pt = zc.mt.p
Distance axis pinion to gasket of the rack in mm = a = Image122
Distance axis pinion to back face of the rack in mm = A = Image123 + hf + H = m.(1,16 + Image116)
+ H
= A = Image123 + hf + H = m.(1,25 + Image116)
+ H
Helix angle at pitch cylinder = β = cosβ = Image124