Friction. When the drill bit is doing its job, cutting the material causes heat and so does the contact of the flue against the walls of the hole.
If you have just drilled using the drill bit, the pressure will build with the friction and cause the drill bit to be extremely hot.
Friction makes it hot.
Because the friction of drilling heats it up.
The drill bit's tip is cutting away wood or metal and creating heat because of the friction involved. If you touch the blade of a saw after cutting, you'll notice the same.
Use a standard HSS drill bit, but slow down rotation to about 500 rpm.
You need a diamond tipped drill bit to drill glass or tile.
You can drill holes in aluminum with a drill as long as you have the proper drill bit. Use a regular drill bit and keep speed moderate.
You don't need a drill bit for anything on drywall.
Your meaning is not clear. - If you are going to tap the threads in, use a 7/32 drill bit. If you want a hole that this bolt will slip through, use a 9/32 drill bit.
A regular HSS drill bit will easily cope with masonite.
I would use a 5/8 drill bit which is almost exactly 16mm.
I use a 3/16 drill bit for that.
Yes, there is. You use a tungsten or cobalt coated drill bit for this.
You can use a standard HSS drill bit with the edge slightly dulled with a grinder so it does not 'break through' at the outside edge. -Drill slowly and hold the drill steady. I always put a piece of smooth scrap wood at the point where the drill bit is going to come out.