Choosing the right drill bit can make a huge difference in your work. Not all bits are the same. They come in different shapes & sizes. Variety of materials and coatings are available. Which drill bit does the job?
Well, read the rest of this article to find out.
A little bit can make a big difference. That’s why it’s very important that you pick the right drill bit from the start.
This guide will help you decide which bit will be right for your job.
Whether you pick a hammer drill or rotary hammer drill, most tools and other machinery have a specific drill bit that is designed only for that task. Other tools allow you to set different drill bits.
Here is a quick preview of different types of drills, design types and materials.
Choosing The Right Drill Bits
Drill Bit Materials
HSS (High-Speed Steel) is the most popular drill material for maintenance drilling applications. You could say this is an economical solution for most home DIY works. This material is good for drilling into wood, plastic as well as soft steels.
HSCO (Cobalt) is best suited for drilling into harder steel and stainless steel grades. This is considered as an upgrade from High-Speed Steel because the base material contains 5-8% cobalt. This is for those people who want to do some tough drilling around the house.
Carb (Carbide) is a bad ass drill. The hardest, toughest and most brittle of drill bit materials. It is used for production drilling. If you are into that sort of work where a high-quality tool holder & heavy equipment is used, then you know this is the drill bit material that everyone loves.
Bad news for DIY workers, you can’t use them in hand drills or even drill presses. This is meant to be used is most demanding and hardest materials.
Drill Bit Design Features
Drill Point Length
Screw Machine length
These are the different types of length you can use. I would prefer shorter drill length only if short drill bit can do the job. There are some perks of using a shorter drill bit. Because of their short size, they are more accurate. No offense to the long drill bits. Short guys rule!
Accuracy isn’t the only perk of having shorter drills. They also don’t break often because they are more rigid. It’s a good option because not only it will keep workers on task but also keep the project on schedule. These are also useful in tighter and more confined areas.
Drill Point Angle
Standard 180 Degrees angle which can be found on most common types of drills. Typically, these drill bits have two cutting lips.
Self-centering 135 Degrees angle for faster drilling. This type of drill bit is perfect for drilling into stainless steel materials because they have four cutting lips with a sharp center.
Most common with the 30 Degrees angles is the standard design.
Another type you can find is the parabolic design. It features an open design that helps remove chips out of the hole. You’ll find this type of design very efficient for drilling soft materials like plastics and other similar material.
Titanium Coated Bits, now why is it coated with Titanium? First of all, it causes less friction. It also stays sharp a lot longer than your usual common bit.
What do you use it for?
Well, it’s good on wood; it’s also good on metal, PVC & fiberglass. Unlike uncoated bits, you can run them faster.
Black Oxide can resist corrosion and also reduces friction. It also increases chip flow. You can’t use it on nonferrous materials. Normally, you would find black oxide coated on brad tip.
Brad tips are great for wood. Because it’s not meant for metal so you can’t use it on metal. That’s why I said it’s good for wood. No pun intended.
Another specialty of this drill bit is, it keeps the bit centered. It starts by making a tiny pilot hole before it really digs in with the rest of the bit.
TiCN (Titanium Carbonitride), it has a blue-gray color. Great for drilling aluminum, cast iron, and stainless steel. It has a harder and more wear-resistant coating that other coated drill bits.
TiALN (Titanium Aluminum Nitride) has a violet color. It can be used in titanium, nickel-based materials, and high alloy carbon steels.
Bright, it is polished which increases chip flow but no real finish. You can use it in woods, plastics, and aluminum.
Choose the Right Point Styles
118° Point – Designed primarily for drilling into wood or plastic. Center punch is required for drilling into metal, otherwise bit will “walk” or “skate”.
135° Split Point – Starts on contact in metal, wood and plastic. Eliminates “walking” or “skating” when drilling into metal. 135° Split Point on all bits above 1/8″.
Speed Helix – More aggressive drilling angle on drill bit flutes, which provides up to 3x faster penetration. Extends the life of the drill and extends battery life in cordless drills.
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