Why 80 per cent of tree climbing arborists choose the Silky Zubat as their handsaw.
In this editorial various features of the Silky Zubat will be discussed. You will see the logic and reasons why the Silky Zubat is the most popular handsaw in the world for arborists, foresters, landscapers and gardeners in the know.
Let’s Talk About Kerf And Set Teeth
Kerf is the thickness of the cut and set teeth is the way alternate saw teeth are bent to the left and right to make a wider cut. This prevents friction as the rest of the blade follows through the branch. A handsaw can have a thickness of 1.9mm and with set-teeth a kerf of 2.3mm. A saw with non-set teeth will have a kerf within .03mm of the blade thickness.
Silky Saws realised long ago that the wider the cut, the more wood you are cutting and the more effort you need to apply to cut through a branch. They also realised that a saw blade with set teeth used more energy cutting than a blade with non-set teeth. Silky needed to solve a number of problems though. A saw blade with non-set teeth needed teeth that made a wider cut than the rest of the blade so friction on the blade was eliminated as it followed the teeth down through the branch.
After numerous attempts, Silky Saws were ground so that the teeth were thicker than the rest of the blade. Using a Vernier of Micrometer on a Silky Saw Blade, you will see that the teeth are the thickest part of the blade, the top edge less in thickness and the middle of the blade the thinnest. Taper grinding or hollow grinding are some of the names given to this process.
At the same time as working out the way to have non-set teeth on a blade, Silky wanted their non-set saws to cut as well or better and faster than a blade with set teeth. Silky had to design a new tooth shape that had teeth angles alternating on each tooth. They created a blade with many teeth that were like little chisels alternating along the length. These little chisels are razor sharp and cut cleanly through the fibres of a tree trunk or branch.
In-Built Advantage Of Japanese Handsaws
Combined with smaller kerf and non-set teeth, Silky Saws from Japan also have an inbuilt advantage for handsaws. Saws from Japan are usually pull saws, meaning that the saws cut on the pull stroke. This allows Silky Saws to have thinner blades with less depth than the usual western saw that cuts when you push it.
How Do Non-Set Teeth And Smaller Kerf Benefit An Arborist?
Set is created by bending the tips of the teeth in alternating directions. This creates clearance in the cut for the saw plate, reducing friction and binding. Additional set creates more work (by increasing the amount of wood being removed) and decreases the quality of the cut.
Benefit Of Smaller Kerf To An Arborist
A non-set tooth makes a smaller kerf (width of cut) than a set tooth (teeth bent alternatively left then right). This narrower cut means you are cutting less wood (width ways) and more wood (depth ways) on each stroke. Therefore, with a non-set tooth Silky Zubat you are cutting through the branch more quickly than with an equivalent length saw with set teeth.
Less saw strokes means quicker cutting and less energy expended. For an excellent article on set saws go to www.blackburntools.com/articles/saw-tooth-geometry/index.html
Benefit of Non-Set Teeth
A non-set tooth cuts a branch leaving a much smoother cut than a set tooth. This is a benefit to the tree being pruned as it helps prevent the introduction of mould and bacteria through the wound created by the cut. That is the reason tree surgeons and arborists make vertical or near verticals cuts when pruning. It sheds water keeping the cut surface drier, stopping mould and bacteria being attracted to a wet surface. When you combine that with a silky smooth surface that Silky Saws provide your tree is receiving the best cut possible.
Silky Zubat Arborist saws are available throughout Australia.