Tools & Workshop Machines: Pruning Saw

Understanding Tools & Workshop Machines: Pruning Saw

A saw blade works because each tooth acts like a tiny chisel. The teeth scrape and slice wood fibres to form a narrow channel called a kerf. Many blades have teeth bent slightly left then right.

This tooth set makes the kerf wider than the blade, which reduces rubbing and sticking. In a pull-cut saw, the blade stays straighter because pulling puts it under tension. Long, smooth strokes use more teeth and clear sawdust better.

Short, jerky strokes concentrate force on a few teeth. They make the cut slower, rougher, and more tiring. Let the teeth do the cutting instead of forcing the blade through the wood.

Wood is not the same in every branch. Fresh green wood contains moisture and flexible fibres. Dead wood is often drier, harder, or brittle.

A branch may look solid while being weak inside because of decay. This changes how it breaks and how much weight it can hold. The swollen area near the trunk or parent branch contains active tissues that can grow over a wound.

If this area is cut away, healing takes longer and decay can enter more easily. If a long stub is left, it may die back before the tree can seal it.

The goal is a smooth final cut in the correct place, without tearing bark or crushing living tissue. Tree wound paint is usually not needed because it does not replace the tree's own sealing process.

Large limbs create a special problem because their weight pulls on the cut as the saw nears the end. Without support cuts, the branch can split suddenly and strip a long piece of bark down the trunk. The first small cut from below creates a stopping point for any tear.

A second cut farther from the trunk removes most of the branch weight. The remaining stub is light enough for a careful final cut. This sequence is not only about protecting the tree.

It keeps the saw from becoming trapped when the kerf closes under load. Before beginning, plan where the removed piece can fall.

Keep people, pets, windows, fences, and power lines out of that area. Never cut near electrical lines unless trained utility workers have made the situation safe.

Good body position makes accurate work easier. Stand with stable footing and keep your head out of the likely fall path. Avoid reaching high from a ladder while sawing because the pull stroke can upset balance.

A pole saw is safer for some overhead work, though it still requires a clear work zone. Wear eye protection since dry sawdust and small chips can fly toward the face. Gloves improve grip, but they do not make fingers safe near teeth.

Clean sap from the blade after use, dry it, and store it covered. A dull or rusty blade needs extra force, which increases slipping and fatigue.

Replace a blade when teeth are worn or damaged. Students should pay attention to the direction of each stroke, the branch weight, and the condition of the wood before making any cut.