CNC Super Glue Fixturing: Cheap, Reliable Workholding!

Summary

In this video, the concept of super glue as a work holding technique is explored, showcasing its versatility in machining applications. Using super glue with a layer of tape offers multiple benefits, such as preventing residue on parts and providing strong bonding even with aggressive machining. The video highlights various projects, including mini bike sprockets, cufflinks, and bearing cup rings, demonstrating super glue’s effectiveness in holding challenging or delicate parts. The video also emphasizes the importance of combining super glue with other techniques when necessary and features tips from Chris of Clickspring for turning hard-to-hold lathe parts.

Takeaways

• 😀 Super glue workholding is an unconventional but highly effective technique for securing parts during machining.
• 😀 The combination of super glue and tape (e.g., painters tape or powder coat tape) helps avoid direct glue residue on the part and fixture.
• 😀 Tape also enhances the functionality of the super glue, making it more reliable under various machining conditions.
• 😀 The technique is particularly useful for parts that cannot be held traditionally with clamps, vises, or screws.
• 😀 Different types of tape should be used depending on the material and machining conditions, such as high-temp tape for aggressive cuts or high heat.
• 😀 Super glue can hold parts with low surface area, providing an alternative to mechanical fasteners when clamping methods fail.
• 😀 Once machining is complete, parts can be separated using force (hammer), heat (hair dryer or heat gun), or acetone to break the glue bond.
• 😀 The method works well for parts with irregular geometries that can't be held using standard fixtures, as demonstrated with complex shapes and small components.
• 😀 Super glue workholding allows full access to all part profiles without applying stress or distortion, which could occur with traditional clamping methods.
• 😀 Super glue can be paired with other fastening techniques (e.g., mechanical clamps) for added security, especially when cutting forces are high or the surface area is limited.
• 😀 The technique requires a bit of setup and a learning curve, but once mastered, it significantly expands your machining capabilities, especially for one-off parts.

Q & A

What is the primary benefit of using super glue for work-holding in machining?

The primary benefit is that super glue, when paired with painter's tape, provides a secure hold for parts without the need for mechanical fasteners like vises or clamps. This allows for more flexibility and efficiency in holding parts, especially those that are difficult to secure using traditional methods.

How does painter's tape enhance the functionality of super glue in machining applications?

Painter's tape enhances the functionality of super glue by acting as a barrier between the glue and the part or fixture. This prevents glue residue from sticking, making it easier to remove the part after machining. Additionally, the tape increases the bonding strength of the glue, especially under challenging conditions like aggressive machining or high temperatures.

Why is it recommended to use high-temperature tape in certain super glue applications?

High-temperature tapes, such as powder coat tape, are recommended in applications where flood coolant is used, or when machining materials that can heat up significantly. These tapes provide better adhesion under high-temperature conditions, ensuring that the bond remains strong even during aggressive machining processes.

What are the common methods for removing parts after using super glue as a work-holding technique?

The common methods for removing parts after machining include using heat (with a heat gun or hair dryer), force (hitting the part with a hammer), or acetone to break the glue bond. Additionally, non-marring tools like a putty knife can be used to gently separate the part without damaging it.

What kind of failure can occur when using super glue for work-holding, and how can it be addressed?

A failure can occur if there isn't enough surface area for the super glue to bond properly, especially under high cutting forces. In these cases, combining super glue with other mechanical fasteners or fixturing methods can help provide additional support and prevent failure.

Why is super glue a good option for holding small or intricate parts in machining?

Super glue is an excellent option for small or intricate parts because it provides a stable hold without the need for bulky clamping devices. This is particularly useful for parts with limited surface area that would be difficult to hold with traditional methods.

How does super glue work as an alternative to vacuum work-holding?

Super glue works as an alternative to vacuum work-holding by offering a reliable bond to hold parts securely during machining. Unlike vacuum work-holding, super glue ensures that the bond remains intact even if the part is cut through completely, as there is no risk of losing the work-holding vacuum.

What are some specific use cases where super glue work-holding has proven to be successful?

Successful use cases include machining small parts like mini bike sprockets, cufflinks, and micro surface plates. Super glue was also effective in holding casting patterns and even when machining wooden sub-fixtures, proving its versatility across different materials and machining environments.

What did Chris from Clickspring contribute to the discussion on super glue work-holding?

Chris from Clickspring shared his personal tips and tricks for using super glue, particularly for lathe work. He explained how he often leaves a center tip on parts to register them on a mandrel for future cuts, enhancing the efficiency and precision of the process.

What is the recommended solution when machining materials like aluminum, which can heat up during the process?

When machining materials like aluminum, which can heat up, it's recommended to use air cooling to maintain the integrity of the super glue bond. This can be done by incorporating a gentle air blast through the fixture to prevent overheating and loss of adhesion.