Jackson News Reporter

Problems of U drill in CNC machining | Summary of solutions

 Breaking News
  • No posts were found

Problems of U drill in CNC machining | Summary of solutions

March 16
17:25 2023

What is U drill in CNC machining?

    A U drill is a type of drill bit used in CNC (Computer Numerical Control) machining to create holes with a larger diameter and greater depth than traditional twist drills. U drills are also known as indexable insert drills because they use replaceable carbide inserts to perform the drilling operation.

    U drills have a unique shape that helps to maintain stability during the drilling process, even at high speeds and depths. The drill bit has a U-shaped flute, which provides ample space for chip evacuation and reduces the amount of heat generated during drilling. The inserts used in U drills are designed to be replaceable, which allows for easy maintenance and improved efficiency.

    U drills are commonly used in the automotive and aerospace industries, where deep holes with high accuracy and precision are required. The use of U drills in CNC machining has increased in recent years due to their ability to perform high-speed, high-precision drilling operations with improved chip evacuation and longer tool life.

Why use U drill in CNC machining? Are there any special benefits?

    First of all, the difference between the U drill and the ordinary drill is that the U drill uses the peripheral blade and the center blade of the blade. From this perspective, the relationship between the U drill and the ordinary hard drill is actually similar to the relationship between the clamp turning tool and the welding turning tool. After wear, the blade can be replaced directly without regrinding.

    After all, the use of indexable inserts still saves material compared to solid hard drills, and the consistency of the inserts makes it easier to control the size of the parts.

There are several benefits to using U drills in CNC machining. Some of the main advantages include:

1. Increased productivity: U drills are designed to operate at high speeds and feed rates, which enables them to perform drilling operations quickly and efficiently. This results in increased productivity and reduced machining time.

2. Improved accuracy and precision: U drills are designed to maintain stability during the drilling process, which helps to ensure that the hole is drilled accurately and precisely. This is particularly important when drilling deep holes, as even a small deviation can significant result in sign errors.

3. Reduced tool wear: U drills use replaceable carbide inserts, which are designed to be more wear-resistant than traditional twist drills. This results in longer tool life and reduced tooling costs.

4. Enhanced chip evacuation: U drills have a U-shaped flute design, which provides ample space for chip evacuation. This helps to prevent chip clogging and reduces the risk of tool breakdown.

5. Versatility: U drills can be used to drill a wide range of materials, including steel, aluminum, and composites. This makes them a versatile tool for CNC machining operations.


How to avoid some problems of U drill in CNC machining?

    U drills are commonly used in CNC machining to drill deep holes with high precision and efficiency. However, there are some common problems that can arise when using U drills that can affect the quality of the finished product. Here are some tips to avoid these problems :

1. Use the correct cutting parameters: Using the correct cutting parameters such as spindle speed, feed rate, and coolant flow is essential to achieve optimal results with U drills. Make sure to follow the manufacturer’s recommendations and adjust the parameters be terial based on drilled.

2. Maintain proper chip evacuation: U drills can generate long chips that can clog the drill and cause it to break. Ensure that there is adequate chip evacuation by using a suitable coolant flow and ensuring the chips are cleared out of the hole regularly.

3. Check for drill runout: Runout is a common issue in U drills that can cause the hole to be drilled off-center. Make sure to check the runout of the drill and replace it if necessary.

4. Check for tool wear: U drills can wear out quickly due to their high-speed drilling. Check for signs of wear and replace the drill when necessary to avoid issues with hole size and finish.

5. Use the correct tool holder: U drills require a special tool holder that is designed to hold the drill securely and prevent runout. Make sure to use the correct tool holder for the drill to avoid issues with accuracy and finish.

6. Consider pre-drilling: If the material being drilled is difficult to machine or the hole is particularly deep, consider pre-drilling a smaller diameter hole before using the U drill. This can help to reduce the load on the U drill and improve the accuracy and finish of the final hole.

“7+13” Practical skills of U drill in CNC machine tools


1. Select the right drill bit: Choose a U drill that is suitable for the material you are working with, the depth and width of the hole you need to create, and the speed and feed rates of your CNC machine.

2. Secure the workpiece: Make sure the workpiece is securely clamped to the machine bed to avoid any movement or vibration during drilling. This will ensure accuracy and prevent damage to the workpiece or the drill bit.

3. Check the coolant: Use an appropriate coolant to lubricate and cool the drill bit during drilling. This will prevent overheating, reduce wear on the drill bit, and improve chip evacuation.

4. Set the speed and feed rates: Set the appropriate speed and feed rates based on the material and size of the hole you are drilling. Using the right speed and feed rates will improve the efficiency of the drilling process and extend the life of the drill bit.

5. Monitor the drilling process: Keep an eye on the drilling process to ensure that everything is running smoothly. Check for any signs of wear on the drill bit, such as chipping or dulling. Adjust the speed, feed rates, or coolant as needed to maintain optimal drilling conditions.

6. Remove chips: Remove chips from the hole regularly using compressed air or a chip removal tool. Accumulated chips can clog the hole and cause damage to the drill bit.

7. Perform regular maintenance: Clean and inspect the U drill regularly to ensure it is in good condition. Sharpen or replace the drill bit as needed to maintain its effectiveness.


8. U-drills have high requirements for the rigidity of the machine tool and the neutrality between the tool and the workpiece when used, so U-drills are suitable for use on high-power, high-rigidity, high-speed rapid CNC machine tools.9. When using a U drill, the center blade should use a blade with good toughness, and the peripheral blades should use sharper blades.10. When processing different materials, inserts with different groove shapes should be selected. Generally, when the feed rate is small, the tolerance is small,and the length-to-diameter ratio of U drill is large, the groove shape insert with small cutting force should be selected. On the contrary, rough machining, large tolerance, and U drill If the drill length-to-diameter ratio is small, choose a groove-shaped insert with a larger cutting force.

11. When using the U-drill, you must consider the power of the machine tool spindle, the stability of the U-drill clamping, the pressure and flow of the cutting fluid, and at the same time control the chip removal effect of the U-drill, otherwise the surface roughness and size of the hole will be greatly affected precision.

12. When clamping the U-drill, make sure that the center of the U-drill coincides with the center of the workpiece and is perpendicular to the surface of the cnc turning part.

13. When using a U drill, it is necessary to select the appropriate cutting parameters according to different part materials.

14. When the U drill is cutting, do not reduce the feed rate or reduce the speed arbitrarily because of fear, so that the U drill blade is damaged or the U drill is damaged.

15. When using a U drill to process, when the blade is worn or damaged, carefully analyze the cause and replace the tougher or more wear-resistant blade.

16. When using a U drill to process a stepped hole, be sure to process the large hole first, and then process the small hole.

17. When using the U drill, pay attention to the pressure of the cutting fluid to have enough pressure to flush out the chips.

18. The blades used in the center and edge of the U-drill are different, and must not be used incorrectly, otherwise the U-drill shaft will be damaged.

19. When using a U-drill to drill holes, the workpiece rotation, tool rotation, and tool and workpiece rotation can be used, but when the tool moves in a linear feed, the most common method is to use the workpiece rotation method.

20. When machining on a CNC lathe process, the performance of the lathe should be considered, and the cutting parameters should be adjusted appropriately, generally by reducing the speed and feed.

Anebon provide excellent toughness in excellent and advancement, merchandising, gross sales and promoting and operation for OEM/ODM Manufacturer Precision Iron Stainless Steel. Since the manufacturing unit founded, Anebon have now committed into the progress of new goods. Along with the social and economic pace, we’ll continue to carry forward the spirit of “high excellent, efficiency, innovation, integrity”, and stay with the operating principle of “credit initially, customer 1st, good quality excellent”. Anebon will produce a excellent foreseeable future in hair output with our companions.

OEM/ODM Manufacturer China Casting and Steel Casting, The design, processing, purchasing, inspection, storage, assembling process are all in scientific and effective documentary process , increasing usage level and reliability of our brand deeply, which makes Anebon become superior supplier of the four major product categories, such as CNC machining, CNC milling parts, CNC turning and metal castings.

Media Contact
Company Name: Anebon metal products
Email: Send Email
Country: China
Website: https://www.anebonmetal.com/