Which bit would you use to make large holes?
Spade bits are the tool of choice for drilling holes up to about 1-1/4 in. in diameter for running electrical wiring and other uses. But when it comes to drilling really big holes for locksets or plumbing pipes, reach for a hole saw. A hole saw is a steel cylinder with saw teeth cut into the top edge.
What is the best drill bit for drilling cast iron?
The best drill bit to use for cast iron is a cobalt bit with a 135-degree point angle. The angle is sharper than that on a conventional bit, making drilling faster and more accurate. Cobalt bits are brass-colored. As an alternative, you can also use a gold-colored titanium nitride bit.
What are the strongest drill bits available?
Cobalt (HSCO) is considered an upgrade from HSS because it includes 5-8% Cobalt blended into the base material. This is a great option for drilling into harder steel as well as stainless steel grades. Carbide (Carb) is the hardest and most brittle of the drill bit materials.
How do you make a big hole with a drill?
For drilling a huge hole with a small drill bit, draw a circle and drill around the circle. Now use a file to obliterate the circular part. Next, use a tapered reamer to make a drilled hole bigger. There is no single approach you can follow to drill a hole bigger than your drill bit.
What size drill bits should I buy?
Use a bit 1/64” smaller than the target hole size for softwoods. Use a bit exactly the same size as the hole when working on other materials. If you’re not sure which to select, choose a drill bit 1/64” larger than the hole you wish to create. This will account for variables such a wood density and screw type.
What is the difference between 118 degree and 135 degree drill bits?
A 118 is standard for drilling into soft material like wood and aluminum. It has a more aggressive tip and a smaller chisel. A 135 is standard for drilling into harden material such as stainless steel. It has more pitch so it’s a lot flatter and has a longer chisel.
What drill bits last the longest?
Titanium-coated drill bits last up to six times longer than standard bits. Ideal for drilling through metal, wood, wallboard, and laminates.
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