what is the best type of drill bit to use on very strong hardplate steal 1" thick?

Answer 1

A good one

Answer 2

What are you trying to do? Break into a safe? I'm not sure if I should be helping you! However, I'm new and I'm trying to earn points, so here goes.

Tungsten carbide tipped bits mentioned by previous answerers are generally designed to be used to drill into masonary using a hammer action drill, so that's not your solution.

I would suggest nitride tipped drill bits and get more than one if you can spare the money because they'll blunt quite quickly probably. Also try to get some coolant which is a water based solution and spray some regularly on the bit and drilling site. Cutting compound may help too. All available from good hardware stores.

Finally, set the drill on slow and be patient.

Finally, finally, you didn't say how deppt or what diameter hole you're trying to drill. If it's only a small hole, don't push too hard as you may break the bit.

Answer 3

Heat is the enemy when drilling in steel. Get a good quality bit then insure that you are drilling square ( not on an angle ) Use a slow speed and even pressure and you should see chips and strings of metal being removed. If it is a large diameter hole you can use oil to lubricate the bit this will slow down the bite a bit but will also aid in removing heat. Remember the faster you drill the more heat you will generate and this will fry your bit very quickly

Answer 4

You dont say how big of a hole you are drilling but any good qaulity bit should go through it. Just start out with about a 1 eighth bit and gradually work your way up to whatever size hole you want. With the small bits use a high rpm and the bigger the bit the slower the drill. And use some cutting oil when drilling.

Answer 5

We all ways used to use HSS (High Speed Steel) bits but found that they lost there edge very quickly and broke, but now we use cobalt, they cost about 2 to 3 times the amount but they far out last HSS and cut quicker, a little tip, you don't say how big a hole you want to drill but if you want to say drill a 12mm hole first drill a 6mm pilot hole then a 10mm then finish with the 12mm, also whilst drilling have some body squirt either WD40 at the hole being drilled or dribble oil for 2 reasons, 1) cools the drill tip 2)lubricates cutting surface and lessons the chance of the bit catching and breaking, have fun................

Answer 6

The method is the most important part of the drilling and that is to do it on a slow speed this gives it better biting. The mistake most people make is to drill on fast speed.

Answer 7

Def Carbide and if it is 1" thick beter have a good drill too

Answer 8

Carbide, slow speed, keep the drill bit cool with lube.

Answer 9

Carbide.

Answer 10

Tungston tipped