Boring bits for wood: how to choose the right one?
We have just been looking at the various types and shapes of hole, but how do we go about choosing the best boring bit to make these?
A brief aside: compared to other materials such as metal, wood and its derivatives are much softer, and for this reason, wood boring is a simpler, faster process than that required for machining other materials, even though it nonetheless remains a demanding operation that requires specific technical knowledge. The precision with which the holes are made determines the stability and durability of an item of furniture, and the slightest inaccuracy can result in a badly finished panel.
One of the most critical aspects of this process is to ensure that the entry and exit holes are extremely clean, with an optimal finish, with no “burning” of the material. These two key pitfalls can be avoided by using appropriate speed parameters and boring bits with geometries and teeth that are suited to the processing operation to be performed.
As we saw previously, latest-generation wood boring machines offer high performance and are capable of creating a large number of holes with great precision, but the finish quality is largely dependent on the tool that is used.
When choosing the latter, it is therefore essential to rely on tool manufacturers with proven experience who can provide the user with guidance as to the types, shapes and sizes suitable for them, in accordance with the purpose of the machining operation they intend to carry out, the degree of precision they wish to obtain and the type of material to be processed. Other parameters that must be taken into consideration include the part of the panel to be processed, the grade of finish on the hole that the user wishes to achieve and the depth of the hole itself. All of these variables affect the shape, material and geometry of the cutting edges of the boring bits.
Boring bits can be divided into various categories on the basis of the type of hole that they are used to create. So, we are talking about:
- Bits for blind holes
- Bits for through holes
- Bits for hinges
- Bits with countersink for creating countersunk blind and through holes
These types of bit may have cutting edges in polycrystalline diamond (PCD), tungsten carbide (HW) or solid tungsten carbide (HWM).