# Torque calculation-help needed

by pramura
Tags: calculationhelp, torque
 P: n/a Hello everyone! I need a help from your side. I need the calculation for pulling torque needed to rotate a swing gate hinged at two points.Weight of the gate is 130kg, width 5ft(1.524m) and height is also 5ft. Upper hinge is 0.381m from top and lower hinge is 0.381m from bottom. Do i need to include the total weight of the gate for this torque calculation, because the gate is supported by two hinges. what is the suitable motor for this application? Thanks in advance,
Mentor
P: 39,708
 Quote by pramura Hello everyone! I need a help from your side. I need the calculation for pulling torque needed to rotate a swing gate hinged at two points.Weight of the gate is 130kg, width 5ft(1.524m) and height is also 5ft. Upper hinge is 0.381m from top and lower hinge is 0.381m from bottom. Do i need to include the total weight of the gate for this torque calculation, because the gate is supported by two hinges. what is the suitable motor for this application? Thanks in advance,
You will need to calculate the Moment of Inertia for the gate about the axis of rotation, and you will need to specify how quickly the gate should be accelerated in the move. Those numbers will lead you to the torque. Are you familiar with those terms? If not, www.wikipedia.org has reasonable introductions...
 P: n/a Thanks for your reply berkeman. Yes, for torque calculation we need moment of inertia and angular acceleration.I need to open the gate from 0 to 90 degrees in 15 secs. I calculated moment of inertia but for acceleration if I use constant speed motor to open the gate how can i calculate angular acceleration. I converted degrees into radians and i got 0.1047176 rad/s2. Is that correct.