You don't need a diamond bit. High speed steel will do as long as you drill slow (about 400 rpm) and keep the tip lubricated with cutting oil.
To drill a hole in a cast iron bathtub, you'll need a carbide-tipped masonry bit and a drill with a hammer setting. Mark the spot where you want to drill the hole, then start drilling at a low speed with moderate pressure. Maintain a steady hand and keep the drill bit cool by periodically spraying it with water to prevent overheating.
I have worked with tools over 40 years and never seen an iron drill bit. Most common drill bits are HSS -High Speed Steel.
Iron, carbide, titanium to name a few.
Iron, carbide, titanium to name a few.
I'm no expert, but broke off 1 old brass bolt flush in the cast iron flange of a toilet drain- I then used a metal bit to drill holes for the toilet riser/extender thing to attach to. This all stemmed from a remodel and having mounting bolts too short for the new bowl. The mason bit i tried didn't work as well as the metal bit. I started out small and worked my way up in size. Byron snowslider at hotmail
To put a drill bit in a drill, you typically loosen the chuck, insert the drill bit into the chuck, and then tighten the chuck securely to hold the drill bit in place.
metal drill bit has a finer point
A titanium or cobalt drill bit.
A chuck key is used to remove a drill bit from a drill.
The best type of drill bit for plexiglass is a carbide-tipped drill bit.
A 15/64 drill bit is slightly smaller than a 1/4 drill bit.
You can acquire a drill bit for your drill by purchasing one at a hardware store or online. Make sure to choose a drill bit that is compatible with your drill's chuck size and the material you will be drilling into.