HSSvs cobalt vscarbide

There are many differences between cobalt and carbide drill bits, especially regarding their pros and cons. Firstly, cobalt drill bits can easily resharpen after repeated use, cut through soft or hard materials, and cost less than carbide drill bits. Carbide drill bits last longer than cobalt drill bits, have higher heat resistance, work at very high speeds to decrease manufacturing speeds, and provide toughness to cut through non-ferrous heavy metals and reinforced plastics.

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So, as you can see, many different factors are at play and it's easy for your head to start spinning. Hopefully, some of these tips point you in the right direction. If stubborn applications don't seem to respond to anything you do, or if you need assistance in selecting the right insert, BIG KAISER's technical department is here to assist you. Please contact us at engineering@us.bigkaiser.com or (224) 770-2999 ext. 254 for help with inserts or any other tooling questions.

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When high-speed steel (HSS) drill bits don’t cut it, choosing between cobalt and carbide drill bits can quickly become time-consuming. Luckily, here are some notable differences that will help save you time during your decision-making and help improve drilling performance.

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I've spoken to machinists who are loyal to one nose radius size or leaving a certain amount of stock on a hole simply because it worked on a job years ago and seems to work well on most other jobs. They are then dumbfounded when working on a new job and suddenly there is heavy chattering or poor surface finish.  The truth is, proper nose radius selection depends on the unique specifications of each job, mainly:

Choosing between various drill bit types is a difficult task. With so many sizes and shape variations, they all serve different purposes.

Cobalt drill bits can work longer without cutting fluids or cooldown periods, cutting through materials including cast iron, titanium, bronze, and stainless steel. They are also corrosion-resistant but are often fragile and need adequate care.

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At Drill Bit Warehouse, we pride ourselves on being a well-respected drill bit provider that meets ANSI standards and outlasts the competition. We offer cobalt drill bits for hardened steel and abrasive materials, including bronze, titanium, cast iron, stainless steel, and more. To learn more, contact us today about our high-quality drill bits.

Even among experienced machinists, choosing the right insert for boring a hole remains a difficult process fraught with myth and misconception. However, it is no myth that insert selection can completely save or kill the performance on an application. We can spend all day talking about the best insert substrate/coating (or lack thereof), shape, chip breaker geometry, etc. for a job, but I feel it's important to address one of the most common problems that I come across: use of improper insert nose radius.

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In general, you want to minimize radial forces and maximize axial forces acting on the cutting edge. The dreaded chattering phenomenon is caused by excess radial force deflecting the tool, causing it to "bounce" rapidly on and off the wall of the bore. The typical rule of thumb is to have a radial depth of cut one-half to two-thirds of the nose radius. For example, when using a 16 thou nose radius insert, leave a stock of 16-20 thou on diameter for your finishing pass (be careful not to confuse radial depth of cut with depth of cut on diameter). Maintaining these proper cutting forces encourages good chip formation. Try to use a smaller nose radius as your boring jobs get longer, as this will combat the overwhelming radial forces that cause chattering. But above all, make sure you're leaving the right amount of stock for your particular inserts.

Carbide drill bits are a high-end option for manufacturing and computer numeric control applications. They are tough, provide high-heat dissipation rates, and maintain an edge for longer than other drill bits.

Cobalt vscarbide drill bits

Yet another factor to keep in mind is the fact that a smaller nose radius corner will be more prone to breakage than an identical-sized insert with a larger nose radius.

However, carbide drill bits can break apart if misused due to their brittle nature. Moreover, they also make for optimal masonry or stonework.

Sometimes, jobs will require a certain surface finish. Surface finish, insert nose radius and feed rate go hand-in-hand. Without getting too technical, surface finish improves as you decrease the feed rate (keeping speed the same) and increase the size of the nose radius. These are the first two options you will want to consider. For this reason, don't forget to increase the amount of stock if you switch to a larger nose radius. Also, decreasing the feed rate too much in an attempt to get a better surface finish runs the risk of chattering because the axial depth of cut is less than the hone on the insert tip. If all else fails, you can "cheat" by changing the shape of the nose radius itself to a wiper geometry. This makes the radial cutting edge effectively flat, which produces a surface finish 2x better than a standard insert nose radius at the same feed rate.

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Cobalt drill bits often get constructed using steel or another alloy combined with five to eight percent cobalt. Cobalt drill bits make for optimal high-temperature applications and offer extreme durability.

However, both carbide and cobalt drill bits have minor downsides. Carbide drill bits have a higher price point than cobalt drill bits, along with resharpening difficulties, and will need replacement once blunt. Cobalt drill bits quickly chill on rigid materials, can’t perform high drilling speeds like carbide drill bits, and require resharpening after 100 to 200 holes.

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