5 months by cncdivi

CNC machining has revolutionized the manufacturing industry, allowing for precise and intricate operations to be performed with ease. One such operation is the G86 G Code Boring Cycle, a powerful and versatile tool for enlarging pre-drilled holes and ensuring their accuracy. Are you curious to learn how the G86 G Code Boring Cycle can enhance your CNC milling projects? Then, buckle up as we explore this fascinating aspect of CNC programming.

In this blog post, we will dive deep into the world of the G86 G Code Boring Cycle and related G85 G Code, covering its significance, parameters, and execution process. We will also provide a sample program for CNC milling machines, share tips and tricks for optimizing the cycle, and discuss troubleshooting common issues. By the end, you’ll have a comprehensive understanding of the G86 G Code Boring Cycle and its capabilities.

Key Takeaways

  • The G86 Boring Cycle is a powerful G code for enlarging pre-drilled holes, offering superior precision and efficiency compared to other canned cycles.
  • Understanding the parameters (X, Y, Z axis coordinates, R plane, Feed rate & Spindle RPMs) of this cycle is essential for accuracy & customization.
  • Expert advice on tool selection/maintenance and fine-tuning feed rates/spindle speeds can optimize its performance while troubleshooting common issues ensures precision results.
  • The only difference between G85 and G86 is G86 stops the spindle at the bottom of the hole.

Understanding the G86 Boring Cycle

g86 gcode boring cycle boring head

The G86 Boring Cycle is a potent G code that facilitates the enlargement of pre-drilled holes using specific tools and guarantees their upright position. This powerful cycle employs parameters such as X, Y, and Z axis coordinates, R plane and tool starting position, feed rate, and spindle RPMs. To execute a G86 Boring Operation, one must follow a precise procedure involving tool travel and rapid traverse, cutting feed rate and spindle RPM, and tool return commands. With proficiency in these steps, accurate hole position data can be attained, and the overall efficiency of your CNC milling projects will be improved.

Optimizing the G86 Boring Cycle involves selecting and maintaining the appropriate tooling, adjusting feed rates and spindle speeds, and resolving common issues that may arise during the operation. Appreciation and application of these tips and tricks will allow you to harness the full potential of the G86 Boring Cycle and improve your CNC machining skills.

Significance of Boring Cycle

For precision and accuracy in hole boring operations, the G86 Boring Cycle is indispensable. One key distinction between the G86 Boring Cycle and G81 drilling is that the G86 pauses at the bottom of the hole and rises while the tool is stationary, whereas G81 drilling does not pause at the bottom of the hole. This unique feature of the G86 Boring Cycle allows for greater control over the dimensions and surface finish of the hole.

The G86 Boring Cycle is primarily used for boring holes in CNC milling machines, enabling the tool to traverse to the bottom of the hole with feed and then retract back out at a rapid rate. It is commonly employed for rough holes or those requiring additional machining operations. The G86 Boring Cycle, offering superior precision and control, serves as an invaluable asset in the CNC machining toolkit.

Comparing G86 to Other Canned Cycles

The G86 Boring Cycle is just one of many canned cycles available in CNC programming. These canned cycles automate specific machining operations, facilitating the programming process and streamlining production. However, the G86 Boring Cycle stands out due to its ability to provide exact control over the boring operation, allowing users to specify the exact diameter and depth of the hole.

Compared to other canned cycles, the G86 canned cycle offers superior precision and efficiency, requiring fewer lines of code to execute. Nevertheless, be aware that the G86 Boring Cycle is exclusive to boring operations and is unsuitable for other machining operations, like drilling or tapping. Additionally, G86 is more complex than other canned cycles, necessitating more lines of code for execution.

G86 Boring Cycle Parameters

A thorough understanding of the G86 Boring Cycle parameters is crucial to executing a successful boring operation. These parameters include:

  • X, Y, and Z-axis coordinates
  • R plane
  • Feed rate
  • Spindle RPMs

Gaining proficiency in these parameters will ensure your G86 Boring Cycle operates with accuracy, efficiency, and is customized to your specific machining needs.

Let’s delve deeper into these parameters and explore their roles in the G86 Boring Cycle, examining how they interact and impact the overall operation. A comprehensive understanding of these parameters will enable you to leverage the full power of the G86 Boring Cycle, thereby enhancing your CNC milling capabilities.

X, Y, and Z Axis

The X, Y, and Z-axis coordinates play a pivotal role in the G86 Boring Cycle, as they determine the location of the hole being bored, regulate the tool travel and rapid traverse, and manage the cutting feed rate and spindle RPM. By accurately positioning the hole and controlling the tool’s movement, these coordinates ensure that the boring operation is precise and efficient.

The X and Y coordinates indicate the location of the hole on the XY plane, while the Z coordinate represents the depth of the hole. The only difference in the tool’s movement is the controlled rate at which it travels along these coordinates, ensuring that it reaches the desired final depth and location.

Mastering the use of X, Y, and Z-axis coordinates allows for exceptional accuracy and precision in your G86 Boring Cycle operations.

R Plane and Tool Starting Position

The R plane is another critical parameter in the G86 Boring Cycle, serving as the reference point for the Z-depth of the hole, from which the tool initiates the boring operation. This point R is crucial for accurate hole positioning, as it defines the tool’s starting position and ensures that the tool is properly aligned with the hole.

By accurately setting the R plane, you can ensure that the boring operation proceeds smoothly and efficiently, preventing errors and ensuring the desired hole depth is achieved.

Comprehending the R plane and its role in the G86 Boring Cycle is key to the successful execution of an accurate boring operation.

Feed Rate and Spindle RPMs

Feed rate and spindle RPMs are essential for attaining precision and accuracy in hole boring operations. The feed rate, determined by the F parameter specified in the G86 command, dictates the speed at which the machine feeds into the hole during the boring process. Adjusting the feed rate allows for ideal cutting conditions, ensuring effective material removal and minimizing the risk of tool wear or damage.

Spindle RPMs, on the other hand, control the spindle’s rotation during the boring operation. Properly adjusting spindle RPMs ensures that the tool is not rotating too quickly or too slowly, preventing errors and ensuring a smooth and efficient operation. Mastering adjustments of the feed rate and spindle RPMs will optimize your G86 Boring Cycle, allowing for maximum precision and accuracy.

Executing a G86 Boring Operation

To execute a G86 Boring Operation, a precise procedure involving the following commands must be followed:

  1. Tool travel and rapid traverse
  2. Cutting feed rate
  3. Spindle RPM
  4. Tool return

This process ensures accurate hole position data and enhances the overall efficiency of your CNC milling projects.

Let’s break down the steps involved in performing a G86 Boring Cycle operation, providing you with a clear and concise guide to executing this powerful CNC program. Adhering to the process outlined below will enable you to master the execution of a G86 Boring Operation, leading to exceptional accuracy and precision in your CNC milling projects. With practice and attention to detail, you can unlock the full potential of the G86 Boring Cycle and elevate your machining skills.

Tool Travel and Rapid Traverse

The first step in the G86 Boring Operation is:

  1. Positioning the tool at the XY plane and rapidly traversing to the R plane.
  2. The tool travels to the bottom of the hole with feed during this stage.
  3. It then quickly retracts back out of the hole.
  4. Rapid traverse is utilized to expedite the relocation of the tool to the subsequent coordinate in the G86 Boring Cycle, enabling a swift and efficient tool movement.

Proficiency in the tool travel and rapid traverse process is vital for accurate and efficient G86 Boring Cycle operations. By ensuring that the tool is properly positioned and moves at the optimal speed, you can prevent errors and achieve the desired hole depth and location.

Cutting Feed Rate and Spindle RPM

Once the tool is positioned at the R plane, the cutting feed rate and spindle RPM come into play. The cutting feed rate is regulated by the F parameter specified in the G86 command and determines the rate at which the machine feeds into the hole during the boring process. Adjusting the cutting feed rate is essential for ensuring optimal cutting conditions and preventing tool wear or damage.

The spindle RPM is regulated by the S parameter and controls the spindle’s rotation during the boring operation, ensuring that the tool is not rotating too quickly or too slowly. Properly adjusting spindle RPMs is crucial for a smooth and efficient operation, preventing errors and ensuring a precise and accurate hole.

Proficiency in adjustments for cutting feed rate and spindle RPM will optimize your G86 Boring Cycle, yielding maximum precision and accuracy.

Tool Return and G98/G99 Commands

The final step in the G86 Boring Operation is the tool returns process, which is regulated by the G98/G99 commands. These commands control the tool’s retraction from the workpiece and return to its initial position, ensuring that the tool is properly aligned and situated for the next operation.

Comprehension and implementation of the tool return process and G98/G99 commands are vital for a successful G86 Boring Cycle. By ensuring that the tool is properly retracted and returned to its starting position, you can prevent errors and achieve a smooth and efficient operation, ultimately leading to precise and accurate hole positioning.

G86 Boring Cycle Program Example

Now that we have a thorough understanding of the G86 Boring Cycle and its parameters, let’s take a look at a sample G86 Boring Cycle program for CNC milling machines. This program example will help you visualize the process and provide a foundation for you to create your own G86 Boring Cycle programs for your specific projects.

Remember, this is merely an example of a G86 Boring Cycle program, and your specific needs and requirements may vary. However, this sample program can serve as a starting point for understanding the command format and structure of a G86 Boring Cycle program.

; G86 Boring Cycle Program Example

N10   M06 T08 ; Select tool #8
N20   G90 G80 G17 G00 G54 X0 Y0 ;  Safety Block.  Absolute co-ordinates, cancel canned cycle, XY plane, rapid ; motion, default work coordinates.
N30   G43 Z100 H1 ;  Tool height offset compensation
N40   M03 S1000 ;  Spindle ON clockwise at 1000 rpms
N50   M07 ;  Coolant ON
N60   G99 G86 X10 Y25 Z-30 R5  F100 ;  G99 = Return to R Plance.  Boring cycle command.  Position X10, Y25.  Depth is 30 from R-Plane, R plane is 5, feed rate is 100
N70   X40 Y10 ;  2nd boring position
N80   G98 G80 G00 Z100 ;  Tool return to initial position.  Cancel canned cycle.  Rapids.
N90   M05 M09 M30 ;  Spindle OFF, Coolant OFF, End Program.

Tips and Tricks for Optimizing G86 Boring Cycle

For optimum results from your G86 Boring Cycle operations, it’s vital to refine the process by choosing suitable tools and adjusting feed rates and spindle speeds. By paying attention to these critical factors, you can maximize the efficiency and accuracy of your G86 Boring Cycle, achieving exceptional results in your CNC milling projects.

In the following sections, we will provide expert advice on tool selection and maintenance, as well as tips for fine-tuning feed rates and spindle speeds. By applying these tips and tricks, you can unlock the full potential of the G86 Boring Cycle and elevate your CNC machining skills.

Tool Selection and Maintenance

Big Kaiser Boring Head

Choosing the right boring tool is key to achieving accurate and precise hole creation in the G86 Boring Cycle. Factors to consider when selecting a tool include the size of the hole, the material being bored, and the type of tool being employed. The tool should be capable of handling the material being bored and should be of adequate size for the hole.

Proper maintenance of your boring tools is also essential for optimal G86 Boring Cycle performance. This involves regularly inspecting the tools for wear and tear, sharpening or replacing them when required, and ensuring that they are adequately lubricated. By maintaining your boring tools, you can ensure consistent precision and accuracy in your G86 Boring Cycle operations.

Fine-Tuning Feed Rates and Spindle Speeds

Tweaking the feed rate and spindle speed is vital to ensure optimal cutting conditions, and to achieve the desired surface finish and dimensional accuracy of the bored hole. The feed rate should be adjusted to ensure that the tool is cutting effectively, while the spindle speed should be adjusted to prevent over-stressing the material.

When optimizing spindle speeds for the G86 Boring Cycle, consider the material being cut, the tool being used, and the desired surface finish. The spindle speed should be increased for harder materials and decreased for softer materials. Additionally, the spindle speed should be adjusted based on the type of tool being employed, as some tools require higher spindle speeds than others.

Troubleshooting Common G86 Boring Cycle Issues

Even with meticulous planning and execution, complications might occur during a G86 Boring Cycle operation. Common problems include inaccurate hole positioning and uneven boring depth. For optimum results, it’s crucial to promptly and efficiently identify and resolve these issues.

In the following sections, we will discuss solutions to common G86 Boring Cycle issues, providing guidance on how to troubleshoot and rectify these problems. By addressing these issues and optimizing your G86 Boring Cycle operations, you can achieve exceptional precision and accuracy in your CNC milling projects.

Inaccurate Hole Positioning

Inaccurate hole positioning in the G86 Boring Cycle can be attributed to several factors, including:

  • Incorrect programming of parameters
  • Excessive dwell at the bottom of the hole
  • Improper starting position provided by the spot drill
  • Turning of the boring tool resulting in scratches on the hole surface.

Addressing these issues involves:

  • Verifying the correctness of your programming parameters
  • Adjusting the dwell time at the bottom of the hole
  • Confirming the spot drill’s starting position
  • Checking the alignment of the boring tool

By addressing these factors, you can achieve accurate hole positioning and a precise G86 Boring Cycle operation.

Uneven Boring Depth

Uneven boring depth in the G86 Boring Cycle may be caused by factors such as:

  • Improper tool alignment or positioning
  • Varying feed rates
  • Tool wear or damage
  • Machine vibrations or instability
  • Programming mistakes or incorrect parameters

Addressing uneven boring depth involves:

  • Confirming that the tool is properly aligned and positioned
  • Ensuring a consistent feed rate
  • Inspecting the tool for wear or damage
  • Checking for machine vibrations or instability
  • Reviewing the program for errors or incorrect parameters

By addressing these issues, you can achieve a consistent boring depth and an accurate G86 Boring Cycle operation.

Summary

Throughout this blog post, we have explored the power and versatility of the G86 Boring Cycle in CNC machining. We have covered its significance, parameters, and execution process, delved into tips and tricks for optimizing its performance, and discussed troubleshooting common issues. By mastering the G86 Boring Cycle, you can elevate your CNC milling projects and achieve exceptional precision and accuracy.

As you continue to hone your CNC machining skills, remember that the G86 Boring Cycle is just one of many powerful tools at your disposal. Embrace the power of CNC programming, and unlock the full potential of your milling projects. The possibilities are limitless, and the future of manufacturing is in your hands.

Frequently Asked Questions

 

G85 and G86 are both canned cycles used for boring.  The only difference is G86 stops the spindle before retracting the tool.

G86 is a canned cycle used for drilling where the Z-axis moves at a specified feedrate to a Z position, dwells for a set number of seconds, stops the spindle, and then retracts at a traverse rate.

The primary purpose of the G86 Boring Cycle is to enlarge pre-drilled holes with a boring head.

 

Like what you read on CNCCookbook?

Join 100,000+ CNC'ers!  Get our latest blog posts delivered straight to your email inbox once a week for free. Plus, we’ll give you access to some great CNC reference materials including:

  • Our Big List of over 200 CNC Tips and Techniques
  • Our Free GCode Programming Basics Course
  • And more!

Just enter your name and email address below:

Full Name
Email *
100% Privacy: We will never Spam you!

Rate this post