Gate Weight and Hinge Strength for an Operator
On a leaf that does not swing free by hand, no operator will fix the problem. A motor can only move what the hinges already carry (as automatic gates georgetown nochucknorris repeats), and a gate that drags or binds will wear out a gate operator in a season or two. In Georgetown, TX the hinges, posts and frame are checked first, and the motor is chosen after.
What is the hand test?
The hand test is simple: with the power off and the release open, the gate should swing or roll with one hand and stay where it is put. A leaf that creeps shut or open on its own is out of plumb. A leaf that sticks halfway is rubbing, and one that needs a shove at the start is binding on a hinge or a post.
How do hinges carry the weight?
Hinges carry the full weight of the leaf and also resist the pull of the operator. A heavy swing gate needs adjustable hinges with a thrust bearing at the bottom, and a greased pin at the top. A weld-on barrel hinge with a worn pin lets the leaf drop, and the operator then fights the sag with every cycle.
What do the posts have to do?
Posts have to stay put under both the weight of the gate and the push of the motor. A post set in a shallow footing leans over time, and a leaning post throws the whole opening out of line. In limestone soil the holes are often cored into rock or set wider rather than deeper, and the concrete needs time to cure before an operator is bolted on.
How does leaf weight change the operator?
Leaf weight and width set the size of the motor and the type of drive. A light aluminum leaf can be moved by a modest swing arm, while a heavy steel dual swing gate takes a heavier unit or a hydraulic arm. A wide leaf has more leverage against the hinge, so the width counts as much as the weight.
What gets fixed before the motor goes on?
Anything that sags, rubs, rusts or binds is fixed before the motor is mounted. Hinges are replaced or adjusted, the frame is squared, and the posts are reset if they have moved. A gate that was a pleasure to push by hand is the one an operator will run for years, and the work on the hinges is what makes that possible.