feedback about new drill bits

L78 Nova · 04-16-2021, 09:30 AM

Quote:

Originally Posted by dwydendorf

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.

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

curtis reed · 04-16-2021, 09:49 AM

Quote:

Originally Posted by L78 Nova

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

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.

dwydendorf · 04-16-2021, 10:48 AM

Quote:

Originally Posted by L78 Nova

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

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.

monte385 · 04-17-2021, 01:32 PM

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

Jeff Niceswanger · 04-17-2021, 02:53 PM

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

04-17-2021, 01:32 PM	#4
monte385 Junior Member Join Date: Oct 2015 Posts: 60 Likes: 45 Liked 27 Times in 19 Posts	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.

04-17-2021, 02:53 PM	#5
Jeff Niceswanger Senior Member Join Date: Jul 2003 Posts: 908 Likes: 703 Liked 1,072 Times in 379 Posts	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 __________________ Jeff Niceswanger 3740 SS Last edited by Jeff Niceswanger; 04-17-2021 at 02:56 PM.