Using the right deep hole drilling tool is crucial to creating accurate, long-lasting holes. Deep hole drilling is a highly specialized process that requires specialized machinery and special cutting instruments. The first deep hole drilling company created processes designed to produce gun barrels but have now expanded into a wide range of industrial applications, including medical tooling and plastic injection molds. There are two main methods of deep hole drilling: gun drilling and BTA drilling. Both use coolant to remove chips and require specialized cutting instruments.

Retracting the drill after reaching the bottom of the hole

Retracting the drill after reaching the bottom can improve the overall performance of the process. The drill is retracted with a high feed rate and at a speed of 500 rpm. This helps in chip removal. Before retraction, the coolant should be shut off.

Tool runout control

Medical manufacturers are increasingly turning to dedicated deep hole drilling machines for their processes. This type of machine can provide the same precision and repeatability that standard deep hole drilling machines offer, but it has a number of specific advantages. For example, it has two independent drilling axes and the ability to counter-rotate parts to achieve greater concentricity tolerances and fewer mismatches. And it can do this in a compact footprint.

Deep hole drilling is a complex process that presents unique challenges. One of these challenges is the need to control runout. This problem becomes more critical as tools become longer. Changing from a 6x diameter to a 30x diameter tool creates a larger runout, even though it is possible to compensate by using an accurate toolholder.

Runout is a mechanical problem that can affect the life of the tool. It is caused when the tool’s shaft is not perfectly aligned with the main axis. It can also result in larger holes than the nominal diameter. In some cases, runout can be so large that it causes the tool to break. Luckily, there are ways to reduce runout and eliminate it altogether.

Medical deep hole drilling processes can be more predictable when tools are managed well. By following drill entry procedures, the chances of chipping the corner or breaking the primary cutting edge are significantly reduced. In the end, this means less scrap for the company. The process also becomes more consistent. This means less tool failures and a more consistent production.

For precision in drilling titanium, it is important to keep the process as steady as possible. Titanium is a very hard material with very small tolerances. Therefore, the best way to handle titanium drilling is with strong, durable tools. During the process, the tools should be operated at slow speeds and with coolant. It is essential to ensure that they do not cause feed interruptions because any feed interruption will negatively affect the final product.

External coolant not recommended

Most deep hole drills use internal coolant to help with chip evacuation. However, some applications require external coolant. The diameter of the tool is too small, or the application has special requirements. Additionally, older equipment may not be equipped with internal coolant capability. Using internal coolant improves chip evacuation by flushing the coolant down the hole and pushing the chips back toward the top.

External coolant has a lower heat receipt. It can also cause problems with cooling at the end of the drilling process. Furthermore, dry drilling does not provide a satisfactory hole shape. In addition, dry drilling generates high residual tensile and compressive stresses. Dry drilling also does not have the benefit of external coolant.

For example, using an external coolant for drilling a hole is not recommended for deep hole medical procedures. Depending on the size of the hole, the coolant pressure should be 3,000 psi. This pressure is necessary to prevent infection. If the hole is larger than 0.040 inches, a higher pressure will be required.

Although the use of external coolant is not recommended for medical deep hole drilling processes, it can be used for cooling. Studies conducted in animals have shown that it limits the temperature rise. The highest recorded temperature was 37 degC, a value comparable to the maximum temperature of human bone. Using an external coolant can limit the risk of thermal osteonecrosis. Additionally, it may prevent loosening and failure of orthopedic fixation screws.

Avoiding drills with unused length

Avoiding drills with unused length in medical deep hole drilling processes is an important step to ensure a smooth, consistent process. Long drills increase the risk of walking, which means the rotating tool will want to go across the surface of the part it is drilling. However, this is less common if the part is smooth and perpendicular. Drill walking can also occur when the cutting edge of the drill is dull. Keeping the cutting-edge sharp is critical to prevent this problem.

Drills with unused length are generally shorter than average jobber’s length. These drills are more suitable for drilling in small areas, and they have less chance of wandering. However, they may not have the reach required for all jobs. Usually, the length of the drill bit is graduated so that you can quickly see which length is right for a specific job.

Using a guide bushing

Using a guide bushing for medical drilling processes is an essential part of a precision machine. Typically, these processes require a high-speed CNC machine with an integrated guide bushing. Swiss-style CNC machines are commonly used in the medical industry and are renowned for their high-volume, precision engineered parts. These parts typically have length-to-diameter ratios of twelve to fifteen. A guide bushing is an essential part of these processes because it allows for the removal of a large amount of material in a single pass.

Guide bushings are used in the same way as a guide bushing on other kinds of machining processes. They have large surfaces that promote excellent lubrication and cooling. They also minimize the possibility of re-entry. However, they are only useful in materials that have large diameters and good machinability.

Different manufacturing processes are used for deep holes with small diameters. These processes vary in quality, repeatability, processing time, and economics. Each type of deep hole drilling process has distinct advantages and disadvantages. When selecting a process, it is important to consider all of the factors involved.

Guide bushings are often used in different industrial settings to guide a drill bit. They are often attached to the drill or inserted into a jig for precision hole drilling. These tools help the user to drill a hole at an exact location and depth.