When You Want A Successful Boring Operation

A shop would need to be stocked with numerous specific boring bars capable of boring the one size hole they were designed for in order to imitate the wide range of hole sizes that can be made with a boring head. And, for successful boring, it is essential to use the right tools and materials, while also following some key suggestions, as those listed below.

Tool geometry

One of the most crucial elements of tool performance to be considered is tool geometry. With a boring tool, clearance and rake angles are absolutely important. Charts released by the majority of the manufacturers contain details on axial and redial rake angles, as well as side and front clearance angles. Consult these charts to determine the appropriate geometry for your project, keeping in mind the part's characteristics as well as the type of material to be machined.

Both high-speed steel and carbide tools have an identical impact on the geometry of the tool at the point of cut. Naturally, we can significantly raise the RPM and S.F.P.M. (surface feet per minute) using carbide, and we can bore a hole with greater accuracy. Solid carbide tools also offer the benefit of having three times as much rigidity as steel. this is ideal when boring deeper holes, or in situations where no deflection is acceptable. However, employing carbide requires more caution in order to avoid chipping. A tool can often suffer more damage from improper handling than from actual use. In use, the two most typical reasons for chipping are dragging the tool out of the bore after cutting, and making the cut while the tool is being fed by hand and allowing it to bounce.

Tool overhang

The unsupported piece of a boring bar or tool—the portion that protrudes from the boring head or tool holder—is known as the tool overhang. We consider the ratio of the diameter of the bar to the unsupported length of the overhang to calculate the amount of overhang. In a boring process, the diameter-to-length ratio is crucial. A boring bar's resistance to deflection diminishes by a factor of its length, or by a factor of nearly eight times for each diameter the bar is stretched. This is more than enough justification for minimizing the overhang.

Tools that are created with a about 4.5:1 ratio are more likely to provide a sturdy tool with a respectable boring depth. We think this is a practical ratio that should result in excellent boring results. We advise the following while using a boring tool.

• With the boring head as close to the spindle bearings as possible, use the largest shank or adapter available when inserting it into the spindle of your machine.
• Use the greatest diameter boring bar that will complete the task and still allow for proper chip removal, and minimize tool overhang.

Feeds and speeds

We take into account the following factors in order of significance with relation to reducing chatter – the number of revolutions per minute (R.P.M.) or surface feet per minute (S.F.P.M.), feed per revolution, and the cutting depth.

Chip control

When boring, chip management is always of the utmost importance. Eradicating chip issues completely is difficult, which is why we would need to make some compromises. However, there are some steps we can take to keep the issues to the minimum. For instance, we shouldn't clog up the hole to the extent that it obstructs chip disposal. Along with efficient chip removal, we'll also improve coolant flow. A through bore presents a little better situation since it allows for adequate coolant flow and good chip clearance even when utilizing a bigger diameter bar.

Other suggestions

• The cutting edge of the tool must be centred.
• Tool sharpness is more important for boring than for O.D. work.
• Reduce tool overhang as much as possible to maximize rigidity.
• Whenever possible, use power feed.
• For optimum surface finish, the spindle should be spinning, ass the tool is being retracted from the bore.
• When using carbide, avoid turning the spindle around or stopping it in the middle of a cut, to shun the possibilities of breakage or chipping.
• When taking a heavy cut, make allowances for spring or deflection. Even though no additional adjustments have been made, more material will be removed during the finish cut.

With the aforementioned suggestions, and the right tools from genuine boring tools suppliers in Bangalore, one like FineTech Toolings, you can successfully achieve a better boring operation and related results.

For more details, visit: https://finebore.com/