Step drill bit for metal (Christmas trees) are used when it is necessary to process sheet material, the thickness of which does not exceed 4 mm. The use of such products requires certain skills from the master. For the acquisition and proper operation of the necessary tool, it is recommended to pay attention to some nuances.
Step drill bit for metal: how do they differ from conical
Step and cone products have a lot in common. These tools primarily have similar faces. Their edges are very sharp, which greatly increases the efficiency of the tools during operation. The advantages of stepped and taper tools include the fact that they save time and also simplify sheet metal processing. The main disadvantage is the price of stepped drills for metal and conical parts.
What are the differences between stepped and conical products? The main distinguishing feature with which you can easily determine the type of drill is the design of the main element of the product – the head. This part, regardless of the type of tool, has a conical shape.
The head of a stepped drill includes several steps with sharp edges. This design increases the efficiency of the tool. Conical products, in turn, are characterized by a smooth surface.
Features of the form – the main criterion that distinguishes conical products from step drills for metal. Cone options are less expensive, but they are not very convenient to use. A stepped tool allows you to make a hole of the required diameter even if a person does not have experience with such a device. This is achieved by clearly dividing the part into steps (levels).
What work can be used for herringbone drills
Functional parts of this type are used to arrange holes in metal sheets. Such drills belong to the category of specialized tools, so their cost is quite high. Often this is the fact that stops buyers when buying. However, the acquisition of such a product may be justified, for example, in the case when accuracy is required when performing work.
Each level of the stepped tool has a unique diameter, which increases as you approach the base. The convenience of this type of construction is undeniable, since it is very easy to choose the right diameter during drilling.
Such products are used to make holes in the metal. Drill fir-trees on metal differ in high quality of drilling. Moreover, this is noticeable even in the case when a very thin sheet material is processed. Other drills do not allow to make an even hole in a metal sheet up to 1 mm thick.
It is worth saying that step-type tools are used not only for metal processing. They can also be used for drilling holes in the following materials:
- a tree.
If it is necessary to make a hole in the pipe, it is also recommended to use a stepped drill bit for metal. Reviews of such a tool can be studied on the Internet. It should be said that step drills are often used to grind the edges of holes made by other tools. Metal chips can also be removed manually, but it is much more complicated.
Step Drills bit for Metal: Key Benefits
Tools of this type have many positive qualities that determine their high efficiency. Of course, the main disadvantage of such a product is its cost. The price of stepped parts varies from 29 to 72$. The final cost of the drill is influenced by the following factors:
- material of manufacture;
- strength class;
- the presence of spraying.
The price of step drills is fully justified, as their advantages greatly simplify the work of drilling holes in a variety of parts. One of the most significant advantages of such products is their versatility. One cutting tool can be used to perform a huge number of tasks, which is very convenient.
Another plus of such drills is high strength. In particular, it is worth paying attention to their cutting edges. The strength characteristics of these elements not only provide high accuracy during operation, but also extend the operational life of the tool.
The speed of work is also a positive characteristic of these products. The tip of the herringbone drill has a pointed shape, which allows it to be used for processing very durable metal surfaces (for example, stainless steel). Metal drill is a specialized tool. When using it, there is no need to use additional devices (centering parts, etc.).
The design features of the stepped tool make it possible to make precise holes with smooth edges. Thus, when using such a product, there is no need to use a grinding machine or needle file.
It is also worth noting that such products are installed both on manual drills and on professional stationary machines. Before purchasing a Christmas tree drill, it is recommended that you familiarize yourself with its varieties. This will allow you to choose the best drill for step-type metal, taking into account individual criteria.
Design and characteristics of conical step drill
These tools have a rather complicated design. Their configuration may vary depending on the variety. Let us consider in more detail what parts such products consist of. The top of the drill is represented by a pointed tip, which allows you to easily crash into metal of any density.
For the processing of metal sheets, other tools are also used, for example, castellated. This type of metal drill does not require the use of auxiliary centering devices, however, it is not suitable for working with thin metal. Spiral analogues also do not allow you to accurately perform such a job.
Step products are very effective when working with aluminum, steel, copper and other sheets and pipes. Tools of this type have the shape of a cone, which includes 2 grooves. They contribute to the drilling of materials. During operation, when going to the next level, a chamfer is formed for the hole that is created by the previous step.
The 4-32 mm stepped drill bit also has an opposite end, which is mounted in the tool holder. The opposite end, or tail, has the most suitable design for this and consists of six faces. The advantages of such tools are undeniable, which is why they are recommended by many masters for working with metal parts.
Varieties and sizes of drill bits for stepped metal
The step tools used to organize the holes are classified according to several criteria. In order to choose the necessary product, it is recommended to familiarize yourself with each of its types in more detail. The first factor by which differentiation of such drills occurs is the dimensions. Depending on this criterion, such drills are distinguished:
- big ones.
Step drills also differ in coating material. Today you can buy cobalt drills for metal, as well as titanium analogues. The second type of product has a higher strength, which affects their cost.
The design of this type of drill involves a groove. Most often, drills that have a straight groove are found. The second configuration option is the spiral arrangement of the channel. On sale you can find models that have a combined type of groove for chip evacuation (longitudinal-spiral).
Note! Step-type drills need to be sharpened from time to time. Sharpening will be more difficult if the tool has a spiral groove.
Of course, one of the most important characteristics of any tool is its size. The steps in such a drill may have a different pitch. This indicator may vary depending on the type of product. It is also worth paying attention to another important criterion – the diameter of the drill for metal. This parameter varies from 4 to 38 mm. The diameter limit may be lower. It all depends on the number of steps in the tool. The height of one step is usually 0.5 cm.
Number and shape of working grooves in step products
One of the most important indicators of such stepped tools is the number of cutting edges. It is important to understand that this parameter has nothing to do with the drill steps. The cutting parts are in the grooves of the conical product. In addition to their main function, they perform one more thing: they remove the chips that are formed in the process.
Grooves can be of 3 types: straight, spiral, and also longitudinally spiral. Each variety has its own advantages and disadvantages. An example is a straight edge that is easy to sharpen. However, it does not behave as smoothly as a spiral during operation.
Despite the high cost, the stepped tool replaces a complete set of metal drills. It is much simpler and more convenient to operate one product. The number of grooves is an indicator on which the quality of sheet metal processing depends. The quality of drilling may vary depending on what speed the material is processed.
When choosing a drill for making holes in a metal material, you need to focus on a few points. It is not recommended to purchase the first product that comes across, as it may not be suitable for a particular job.
Color of step drills used for metal processing
All step tools used to process metal sheets of small thickness are divided into quality groups. Identifying a particular drill is quite simple. All that is needed is to pay attention to its color. Currently on sale you can find the following options for tools:
- golden (dark);
- golden (bright).
Gray drills. This color indicates that the material for the manufacture of the product is ordinary steel, which has not undergone additional processing. These tools do not differ in high strength characteristics. Of the advantages of such devices, it is worth noting their low cost.
Black. Such coloring indicates that the steel product has undergone additional steam treatment, heated to high temperatures. This enhances the technical characteristics of the tool and extends its service life. The price of such products is higher than gray.
Note! The material and the product itself, made from it, must comply with all parameters specified in GOST. Drills for gray metal are not suitable for long-term operation.
Golden (dark). Such tools undergo a fairly intense temperature treatment. This type of procedure helps to eliminate stress in a metal product. The result is a durable part that is best suited for continuous use. The cost of such drills is quite high.
The color of the drill is not related to its configuration. All products have a special channel. The presence of a groove allows for efficient metal drilling. Special curved channels can be found in other products that are used for drilling metal. A good example in this case are metal screws with a drill.
Golden (bright). Another version of the drill type stepped. This color is obtained by applying a special protective coating of titanium to the surface of the product. Such tools have the highest strength.
Criteria for choosing step drills bit for metal: which is better to purchase
When choosing such products, it is recommended to pay attention not only to their color, but also to some other points. For example, a quality 4-32 mm tool costs at least 14$. The dependence of the price on the diameter can be traced not only in step products. A 3 mm metal twist drill will cost less than a 10 mm cross-section tool.
Drills produced by domestic companies, as a rule, have a more attractive cost. However, experts give preference to products that were manufactured by foreign manufacturers. The working life of drills of German and American brands is much higher.When choosing, you need to pay attention to the final and initial diameters. In this case, a certain pattern is traced. The more steps, the higher the cost of the tool. As an alternative to a step product, a set of spiral devices can be purchased. Drills for metal 10 mm and more still not so well established in work. However, the cost of such a kit is usually lower.
To determine the quality steel there is a special marking. On the case of the product intended for processing metal sheets at high speeds, the letters HSS are indicated. The quality of the steel in this case does not allow the drill to deform even with severe overheating.
Another important criterion that should be taken into account is the possibility of multiple tool sharpening. Thus, if you wish, you can familiarize yourself with all the nuances of this operation and conduct it yourself.
How to sharpen a drill bit for metal: step by step instructions
In the process of using a stepped tool, its edges are dull. Return to their previous characteristics allows sharpening. It is easiest to entrust such work to qualified specialists. Therefore, it is recommended to contact specialized workshops that can be found in every city. This option has the following advantages:
- the diameter of all tool levels is maintained;
- the correct angle of the cutting edges is not violated;
- excludes the possibility of overheating of the product.
Sharpening a drill for metal can be done independently at home. However, for this it is necessary to carefully read the basic rules that must be followed during operation.
It is worth knowing that the cutting edges of each step must necessarily be the same. Sharpening should not damage them. Compliance with the exact initial dimensions ensures quality sharpening. After completing this procedure, the angle corresponding to the edge planes should be the same as before sharpening.
Before starting this work, you need to prepare a support stand. An even more correct exit is to fix the drill. The moving element is much easier to damage during sharpening. It is important to remember that for this procedure, abrasive materials that are classified as fine-grained are used.
For these purposes various devices can be used. Sharpening drills for metal is best done on the machine. This equipment must contain a special abrasive wheel. The outer surface of such a tool contains fine sandpaper.
The quality of the work performed is quite simple to determine. To do this, you need to pay attention to the shape of the chips, which is formed during the drilling process. If sharpening was made without errors, then the chips will have the correct dimensions.
Do-it-yourself sharpening a drill for metal using hand tools is done when the drill has a straight ditch. Tools with a spiral channel are not recommended to be processed without special equipment. To perform this operation, you can also use the grinder and a special circle.
The price of taper stepped drills for metal: an overview
The cost of cone drills, the design of which involves the presence of steps, is influenced by several basic factors. Various materials can be used to make this type of tool. Titanium drills are more expensive, as they are highly durable and have a longer service life.
The difference in value is also determined by the diameter of the tool. Christmas tree-shaped products that have a titanium coating can be purchased at a specialized store or place an order on the Internet. You can buy a 4-20 mm tool for about 6,5$. The price of metal drills with a large number of steps (4-32 mm) can reach 16-17$. It is worth noting that such a cost is inherent in domestic products.
Foreign analogues may have a higher price, which averages 57$. A Bosch tool with a maximum diameter of 39 mm costs about 72$. And even this amount is not the limit when it comes to step drills.
Note! The high cost of such tools requires careful selection. The modern market is replete with a variety of fakes, the quality of which is poor. To eliminate the likelihood of buying a low-quality product, it is recommended to purchase drills only from trusted manufacturers.
The price range of step drills bit for metal is quite wide. The most correct decision is to purchase an instrument that is located in the middle price range. Before you buy a particular drill, you should consider that the seller must have a certificate for such products.
Step drill is a professional tool that has a large working resource and allows you to make holes in the metal without the use of auxiliary parts. When choosing such an element, it is necessary to focus on individual criteria, such as the nature of work and its frequency. It is also worth considering the material of manufacture, diameter, shape of the grooves and the manufacturing company. If you wish, you can always consult with a seller who will help you choose the right product.