CNC machines are very sophisticated. They use computer numerical controls to cut complex materials. So, they need very high-grade carbide burrs. These work as grinder bits to perform the cutting task well. The burrs in the CNC machines should run straight and not wobble.
Nevertheless, CNC machines are expensive. Any manufacturer, professional, or hobbyist needs to be keen, especially when selecting carbide burrs for it. So, this article will help a great deal in ensuring you use and maintain your equipment well. It is for functionality and longevity.
What Is the Meaning of CNC Machining?
First, CNC is an abbreviation for Computer Numerical Control.
So, CNC machining can also be a type of metal fabrication. It uses computerized numerical codes and controls.
The codes are to determine every aspect of the manufacturing process. So, it includes how the cutting head moves, RPMs, spindle speeds, and more.
10 Tips of Carbide Burrs for CNC Machine
CNC machining is a very delicate process that needs precision. As mentioned before, it is an expensive machining process. Everything needs to work out for the betterment of the results.
Any scrapping or ruining of an end product will be a loss to the manufacturer. So, here are ten golden tips for handling carbide burrs for CNC machining.
#1. Employ the Appropriate Technique
There are so many ways to use carbide burrs for CNC machining. But, this will depend on the material you are using and the results you want.
Ensure you apply the proper technique. Whether you are sculpting, head porting, grinding, deburring, casting, or chamfering. Using the wrong approach will give a different result from what you expect.
If you have made a loss, redoing the project will be an extra cost. Also, the technique influences the finish of the surface.
#2. Adjust the Top Rake Angle
Adjusting your top rake angle allows you to get a perfect surface finish.
So, the lead angle should ease its insert into your material. On all occasions, the lead angle will cut, beginning from the most robust area on your insert.
What’s more, it is different from when you lead in using a nose radius that targets a separate section. Adjusting your top rake angle allows you to lead out that part. But, a primary determinant of all this is tool pressure.
If the CNC machining section has a thin wall or is flimsy, don’t do it. That’s because adjusting the top rake angle will harm the finish of the surface.
#3. Using a Wiper With Insert
When using carbide burrs for CNC machines, you will want to achieve a flawless surface finish. Moreover, there are special wiper inserts built with nose radiuses and have large corners. They help to wipe and smoothen the surface.
They help the machines cut at faster feed rates than usual. It is essential to check the diameter of the tool you are using. Ensure you engage it between 2/3 and 3/4 of the diameter.
#4. Improve the Speed
Improving speed here means increasing the surface feet every minute. Its abbreviation in fabrication is SFM. In simple words, it helps to reduce the built-up edge (BUE.)
Increasing the speed helps to prolong the lifespan of the burrs and CNC machines. Moreover, it also minimizes the chances of CNC machine failure. It can affect the results of what you are engineering.
#5. Decrease the Feed
Decreasing the feed will need you to lower the Inches per revolution or IPR. So, it reduces flank wear. Besides, it also lengthens the life of the insert.
When using some techniques, you need tools with high feeds. It helps in removing the material faster. Set the CNC machine to a light depth and on the conservative rate when finishing.
Avoid making the depth very light. It makes the CNC machine rub instead of cutting. Most applications will need the 0.020″ thickness.
#6. Perform Roughing and Finishing with Different Tools
Some fabricators use one insert to rough and finish the surface. However, it is wrong, and each process will need its tool.
Use inserts with fast feed rates, large rake angles, and large nose radiuses to rough the part. After that, go for wiper flats when finishing the surface.
#7. Using a Chip Breaker
A chip breaker minimizes the cutting pressure and will create chips that you can move with ease. The chips are to be small so that they exit cutting zones faster.
However, you need to know that materials differ, and selecting a versatile chip breaker can be a problem. There are several considerations of selecting chip breakers. It will help if you have this in mind when looking for a good one.
Sometimes, when you mill a slot, change the cutter instead of your chip breaker. That’s because it allows for faster evacuation of the chips. If your machine is unstable, change the grade of your insert to something more strenuous.
When using a chip breaker, you reduce the chances of deadly tool failures. The long chips won’t scratch on the surface.
It improves safety in your working space. Moreover, it is in a bird nesting manner as you won’t need to clear the chips around the CNC machine using your hands.
#8. Using a Large Nose Radius
Your insert nose radius will determine the type of finish of the surface of the part you are working on at the moment. When the radius is smaller, it reduces tool pressure and fed rate to use.
Using the largest radius will give a perfect finish without creating chatter. You can make heavier cuts with larger nose radiuses significantly when cutting materials that are very hard to whack.
#9. Take Out the Chips
You can choose to use or not use coolant. But, this will depend on your operations. For instance, the depth of milling, type of material, and types of inserts. Materials like low carbon steel, aluminum, and alloys with nickel need coolants. It is to prevent them from getting stuck to the machine.
Others are fine without the coolant. It is to prevent thermal cracking, shortening of the tool life, and harming the surface finish.
#10. Ensure the Condition of Toolholding and Workholding
A tool holder is excellent for improving the finish application. It shouldn’t be old, and neither should the pocket holding your insert wear out. That’s because it moves the insert and can lead to chatter and a poor finish on the surface.
The type of chatter resulting from the wrong tool holding is challenging to reverse hence creating a loss. Ensure that work-holding is stable and very rigid. The stability of work-holding depends on its metal removal rates. So, it should be higher for the best results.
Why Prefer Carbide Burrs for Hard-to-Machine Materials?
Hard-to-cut materials can be tough to machine and undergo deburring. Proper surface finishing can also be a problem.
However, there are some tools like wheel brushes that work well. They can deburr and finish surfaces.
While they work, they aren’t as effective and long-lasting. What’s more, the wire filaments are prone to deforming and breakage.
But, carbide burrs have proven to be the best solution for the two issues. The burrs work well for surface finishing and deburring.
Final Thoughts!
CNC machining is famous for its accuracy. Also, it gives consistency in quality product manufacturing. The speeds of production are higher with almost double efficiency.
The burrs are responsible for a smoother surface finish on the part of the material you are working on currently. Besides, it doesn’t depend on the type of operation. Good quality carbide burrs make work more efficient. They reduce the chances of loss and material wastage.
If you are looking to invest in a CNC machine or new carbide burrs, be keen. Ensure that you buy them from a reputable manufacturer.
It is better to do your due diligence and opt for a reputable carbide burr supplier.