Symbol

Description

Units

J_DM

Inertia of drive mechanism

kg-m²

T_DM

Torque of drive mechanism

Nm

a_DM

Rotational acceleration

rad/s²

h

Efficiency of drive mechanism

q

Incline angle above horizontal

^o

g

Acceleration due to gravity = 9.81

m/s²

P

Screw pitch

rev/m

m

Slide friction coefficient

F_Thrust

Thrust force at load

N

m_Load

Mass of load + payload

kg

m_CB

Mass of counterbalance

kg

M_Slide

Mass of slide

kg

M_Nut

Mass of nut

kg

J_Nut

Inertia of nut

kg-m²

J_Screw

Inertia of screw

kg-m²

J_Coupling

Inertia of coupling

kg-m²