Selection of a drill on diameter to a carving: special tables and features of cutting

Any connection of a detachable type must have a thread. It is worth noting, that all hardware with an external thread, bolts, in particular, can be purchased anywhere: in a construction supermarket or market. And here with a carving of internal type everything is much more difficult. It should be cut with your own hands or using special machines.

Today we will tell, how to properly select drills of a diameter for a particular thread, you will also be able to read the table of these diameters.

The need for selection of drills for carving

To make your own interior thread, take your blank and drill a hole in it, which will correspond to the diameter of the tool, which is designed for slicing. And each of these holes must strictly correspond to the size of the tool. For this purpose it is necessary to select carefully under a carving diameter of a drill.

To date, there are drills with different diameters in size. Starting from the minimum size in 0,5 mm and ending with large conical drills about the size 0,05 mm. Depending on the type of work performed by drilling, you can make holes of different diameters for different needs.

Parameters of selection of a drill under a carving: table

If you need to drill a hole with a large diameter, then you will need to take a special machine, where drills are equipped with conical tails, but ordinary drills are equipped with cylindrical tails. On a large drill, the cone has a fifth size. So, the parameters of the cone directly depend on the diameter of the drill, the larger the diameter of the drill, the more you need a cone. example:

• diameter from 6 to 10 mm;
• the required cone size from 11 to 22 mm.

It is possible to pick up as much as possible precisely diameter of a drill under this or that carving, based on a special size selection table.

If there is a need to create an internal thread, the hole diameter should be selected according to the thread diameter and thread pitch parameters. These data in the tables are marked as M8? 1, where:

• M is a metric thread;
• the number is a threaded step;
• if specified simply M8 and without numbers, then you need to apply the standard large step. This parameter step is the most common and is fitted to most drill sizes.

Diameters require the selection of appropriate holes in size. The table includes a list of the most running sizes, which usually have to deal with in everyday life when performing certain works.

Thread classification

Externally, the thread is similar to a helical groove with a constant cross section. There are only two types:

• external;
• internal.

We have already mentioned these species. Threaded connections are widely used. They are needed for that, so that the part can rotate with the help of translational movements. It is difficult to imagine the normal operation of mechanisms or complex machines without threaded connections. They are also single-west or multi-west.

And in the direction of movement of their guides, they are divided into:

• left;
• right.

If we talk about the classification by size, then it happens to be such species:

• metric;
• inches;
• trumpet.

Metric thread has its own special triangular profile, the angle of which is 60 degrees. All thread parameters are considered in millimeters. If the thread pitch is large, then, as already mentioned, we have a number and a letter. The number indicates the size of the outer diameter of the thread, according to which it is possible to select that or a drill. Technical drawings must include a description of the thread or its analogues. If the metric thread needs to be presented with a small non-standard step, then you need to add a number, which indicates the step.