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Do you have a project that requires a core drill but have never used one before? Before getting started, it's important to understand the ins and outs of using a core drill to ensure the job is done right.
To help you get to grips with using a core drill, this guide will set out everything you need to know, including the different types of core drills and how to use a core drill like a professional.
Core drills, also known as Annular Cutters or Broach Cutters, make it easier to drill holes in thick metal slabs. This type of drill is best suited to holes larger than 1/2".
When drilling thick holes in metal or aluminum, you should opt for a core drill rather than a standard twist drill, as these can be tough to operate.
Core drills are similar to wood hole saws, as they only cut the outer edge of a hole. They cut a groove around the outside of the hole, leaving a solid core or slug in the middle of it. A burr-free, close tolerance hole can be drilled without any pre-drilling or step drilling.
Core drills are typically used with mag drills, but they can also be employed on machine tools like mills and huge drill presses with tool holders.
For example, when using a mag drill attached to a large piece of steel for construction work, this type of mechanical cutter can be used to create large diameter holes.
Flutes - used to eject chips from the drill bit during drilling.
Cutting edge - does the actual cutting and Comes in different angles known as geometry.
Core drills are great for drilling large holes quickly and efficiently. When using a core drill, you must wear protective equipment before drilling, such as:
Safety goggles
Drill gloves
Thick and protective clothing
Dust mask
Once you are fully protected, you can then start the drilling process. To ensure high-quality holes while extending the life of both the drill bit and the machine as a whole, you should follow these important steps:
The first thing you need to do is select the appropriate
ejector pin
based on the cutter blade's length. Insert the ejector pin into the core drill while grasping it. Never attempt to operate a core drill without inserting an ejector pin first.
When using a core drill, it is vital to select an appropriate model for the material you are working with. To help you choose the right one, here are some of the most common core drills available:
Most HSS core drills are made from M2 steel. To drill harder materials, cobalt will be added to steel to make M42-type HSS core drills. HSS can withstand higher temperatures. it can be re-sharpened if it becomes dull
The TiN or titanium coating helps core drill bits to drill harder materials faster. As a result, they outlast standard HSS core drills. The Coating can also help extend tool life by preventing corrosion.
Tungsten carbide has very high wear resistance, and its thermal expansion is less than steel. Due to the TCT cutting edge, the annular cutter can drill hard materials with high-quality performance. Tungsten carbide is sharper than most materials and twice harder than steel. It also has hot hardness at high temperatures allowing faster drilling speed.
Ground Cubic Boron Nitride is almost as hard as diamond. The CBN treated annular cutter has sharp flutes and cutting edges. CBN is frequently used for grinding cutting tools due to its excellent thermal and chemical stability.
Most core drills or annular cutters have Standard-Cut geometry, which means they can cut through one piece of steel at a time. However, when the job involves drilling two or more pieces of material, cutters with Stack-Cut geometry must be used. They tend to have a round cylinder shape, as the cutting teeth are cut from the inside out.
Stack geometry core drills have a unique tooth profile that ensures layer-by-layer safety and stability of penetrating capabilities. As a result, the transitions between layers are smooth, and the hole finishes are exact and clean.
Wondering which drill bits you should choose when core drilling?
Drill bits with carbide cores are the best and can be used in a wide range of materials. However, It's best to employ them only when working with hard or abrasive materials, as they're more expensive than other types of bit material.
Compared to HSS cutters, carbide drill bits require a substantially greater RPM for optimal performance. However, TiAlN-coated core drills are best in horizontal drilling and other applications where lubrication or coolant is not viable due to environmental concerns.
A standard HSS bit can also be utilized in most cases. It is unnecessary to use a coated or carbide cutter on softer metals. However, a coated or carbide bit will pay off in enhanced tool life when working with hard materials.
Compared to standard large drill bits, core drill bits are easier and more efficient to use. Depending on your needs, you can purchase a single drill bit or an entire set. You can find the best core drills for your application by checking out our online store.
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