Question 1

What does the Wood Bandsaw Blade TPI and Radius Calculator do?

Accepted Answer

The Wood Bandsaw Blade TPI and Radius Calculator gives a practical starting point for choosing a bandsaw blade for timber, plywood, plastic and similar materials. It recommends a tooth pitch based on material thickness and, for radius cutting, suggests the widest blade suitable for the curve you need to cut.

Question 2

How do I choose the correct TPI for cutting wood?

Accepted Answer

Thinner material generally needs a finer tooth pitch, while thicker timber and resawing need a coarser blade so the gullets can clear sawdust properly. If the pitch is too fine for the thickness, the blade can clog, heat up and cut slowly.

Question 3

What is the difference between straight cuts and radius cuts?

Accepted Answer

Straight cuts normally benefit from the widest blade your machine can correctly tension because wider blades track straighter and have better beam strength. Radius cuts often require a narrower blade because the blade must turn within the cut.

Question 4

How does the radius calculator work?

Accepted Answer

The radius calculator uses the required curve radius to recommend the widest blade capable of making that cut. Using the widest suitable blade gives the best balance between curve-cutting ability and cutting stability.

Question 5

Why can't I cut a tighter radius with a wider blade?

Accepted Answer

A bandsaw blade must change direction continuously as it follows a curved cut. The limiting factor is the relationship between the blade width and the kerf (the cut width created by the tooth set).

The kerf only provides a small amount of sideways clearance. A wide blade has a much greater distance from the cutting teeth to the back edge of the blade, so within that limited clearance it can only change direction by a small angle before the back of the blade begins to bind against the side of the cut. A narrow blade has a much shorter distance from the teeth to the back edge, allowing it to rotate through a greater angle within the same kerf and therefore follow a much tighter curve.

This is why wider blades are suited to straight cutting and large sweeping curves, while narrower blades are required for tight radius work. For straight cutting, ripping, resawing and gentle curves, the widest blade your machine can correctly tension is generally the best choice because it provides greater beam strength, tracks straighter and is less prone to wandering.

Question 6

What if my timber thickness falls between two TPI recommendations?

Accepted Answer

Choose the closest recommendation as a starting point. For thicker timber, it is often better to choose the coarser option because it gives better sawdust clearance and reduces heat build-up.

Question 7

Can I use this calculator for plastic or aluminium?

Accepted Answer

The calculator can provide a useful starting point for plastics and soft non-ferrous materials, but aluminium cutting also depends on cutting speed, blade condition, tooth form and lubrication. It is primarily intended for wood and similar workshop materials.

Question 8

Does this calculator replace a blade selection guide?

Accepted Answer

No. The calculator gives a practical starting point. Final blade choice can depend on timber species, whether the timber is green or dry, blade width, machine condition, guide setup, feed pressure and the finish required.

Question 9

Why doesn't the calculator recommend every blade width?

Accepted Answer

Blade width mainly becomes critical when cutting curves. For straight cutting, ripping, resawing and gentle curves, the widest blade your machine can correctly tension is generally preferred because it tracks straighter and is less prone to wandering.

Wood Bandsaw Blade TPI and Radius Calculator

Wood Bandsaw Blade TPI & Radius Calculator