Re: feedback about new drill bits
 

Great thread.

Re: feedback about new drill bits
 

Another thing to mention about drill bits are the the point on a drill needs to be narrowed down so it will cut freely. Some drills are naturally thick at the point, causing the drill to try to push the metal in the center instead of cutting it. Turn the drill up on end and narrow the point on the corner of a grinding wheel on a bench grinder.

Re: feedback about new drill bits
 

Depending on the amount of drilling or tapping I am doing, I use a lubricant developed and in use by my former employer under the name of Boelube.

It prolongs the life of drill bits, taps, end mills and tools. It's available through many vendors including Amazon. It is biodegradable and safe on materials.

https://orelube.com/about-boelube-products/pastes/

Re: feedback about new drill bits
 

Re: feedback about new drill bits
 

I just purchased a new drill index (Korean made?) They drill triangulated holes !!! I don't understand how, but they do... GARBAGE.

Re: feedback about new drill bits
 

Are they split point drills? If so that is probably why. You have to have your tool and part clamped and supported solid to keep it from happening. Standard point drills will drill a more round hole if using a hand drill or light duty drill press.

Re: feedback about new drill bits
 

That is what happens when they are not sharpened right. One side of the drill point is longer than the other, causing the center to be off center, allowing the drill bit to wobble, causing a three corner hole. Resharpen the end, taking more off the short side to make the point even, and they will cut better. When a drill bit is sharpened right, you will have a chip comming off both sides of the drill. If your chip is only comming off one side of the drill, your point is off center.

Re: feedback about new drill bits
 

Lots to pick from here. https://www.mcmaster.com/drill-bits
I bought a number set several years ago & they are excellent.

Re: feedback about new drill bits
 

I retired from a huge breakfast cereal manufacturer. The entire place was stainless steel so we brutalized drill bits. These were my favorites... They really do wear well, but their not cheap

https://www.lawsonproducts.com/Super...-Pcs/P7123A.lp