If your drills are dull and no longer drill well, be sure to watch this video called how to sharpen drill bits.

Please allow me to ruffle a few feathers, about this subject. I am a retired toolmaker, that has had a LOT of drill sharpening experience. At one stage of my apprenticeship, I spent three months in the tool grinding room. The first order of business, was to resharpen all of the drill bits, that had been dulled on the previous day's two shifts. The most important detail, is to take a close look at the point of a factory ground drill. The bottom of the drilled hole is a cone. As you move along the cutting edges, from the outer corner, inward to the "dead center", the amount of clearance has to increase, and gradually spiral, or wrap around the drill center line to achieve a free cutting drill. To get this geometry with a RH drill, the right hand needs to become a sort of spherical pivot point, that the drill can rotate about. Keep this hand close to the grinding wheel or belt. Once the drill is held with the cutting edge horizontal, at the proper angle, the left hand swings the opposite end of the drill in an arc, which tracks down and out, in a counter clockwise direction. This may sound complicated and crazy, but it is the way that twist drill point geometry needs to be ground. Buy some cheap new, or used drills of various diameters. Then sit or stand in front of your grinder, and practice until it starts to look "factory". Then try to drill some holes. I have helped a lot of guys improve their grinding. Spending your time grinding drills, will do more for you than trying to build a way around, what is not that difficult, once it is learned. Earlier I mentioned "belt". I worked in a shop during my senior year of highschool, where nearly all of the drill sharpeneing was done by individuals, on a 6" belt sander, which is always flat/straight. I was taught to gage the lip lengths and angles, by holding the drill vertical in front of some plain light source, rotate the drill in your fingers, to align the lips. Your eyes will show you the errors. Now go grab some drill bits, and practice. Soon, you will wonder why you thought that it was difficult.

To properly sharpen a drill but you need two angles... You need to sharpen the cutting edge, the primary angle... Then you need to relieve the primary angle with a steeper secondary angle. This provides relief and keeps the metal of the bit behind the cutting edge from rubbing on the workpiece. The thinner the primary angle, the more efficiently the bit will cut... The trade-off is that the thinner the primary is the weaker it is and will wear out faster. Also of great importance is the rpm of the turning bit and the pressure and speed with which the bit is fed into the work... The larger the diameter of the bit the slower the rpm and heavier the feed... the smaller the bit, the higher the rpm's and the lighter the feed.

One of the first things I learned in shop class was to never grind on the side of a wheel. Look at how non true this wheel is running. Grinding wheels are not made to take lateral forces applied to them and may explode, taking flesh with them.

Do not use the side of a wheel to grind it's dangerous. Just do it by eye ,you will soon get the technique. It's easy

The edge may be sharp but it won't cut properly as you didnt grind a relief angle thats why you get all that squeaking the back edge is rubbing

A simple way to grind your relief, is to color the tip of the drill bit with a colored magic marker. Then starting at the base of the relief grind up to the cutting edge leaving a shadow of the color remaining. Don't over grind the relief as it makes the bit drill want to remove more material than it should. This works it just takes a little practice Also if you want both flutes to drill the same amount. When you are grinding the drill. Make a single pass then rotate the bit 1/2 turn, By doing this you are removing near the same amount on both flutes, keeping the center of the bit in the center. Never make multiple passes before turning the bit. One pass then 1/2 turn, one pass then 1/2 turn. Happy grinding

I'm ok with first method but second is wrong because side wall of grinding wheel is not supposed to be used for grinding. Sorry bro ...

No pilot hole?? No Cutting Oil?? Man, you do it the hard way.

He's cheating....he is an expert....LOL! Thank you for an excellent demo. Great visuals. Thank you!

A nice method to cut sandpaper or linnen is to fold it with the abrasive side inward and then use another piece to sand the fold. Save you scissors and you always have the tool at hand.

Holding that drill bit up against the side of that grinding stone at that angle can be very dangerous. If it catches, it will throw it at you or into your face.I’ve seen it happen.

Cutting a v in the block will let you sharpen multiple sizes of bits…

Drill bits need to be point thinned to cut steel.The central part of the drill needs grinding so the non cutting part is as small as possible.Otherwise drill with a small"pilot drill" and then follow with the bigger drill.

Basically the trailing edge (the surface after the cutting edge) needs to be ground deeper than the cutting edge. I just eyeball it

Regrinding carbide concrete drills for spring blades etc works nicely.

Starrett makes a real nice drill point gauge for grinding by hand....but after youve ground so many by hand over the years, you dont even need a gauge anymore

Why don't you use some oil when drilling?

super cool ❤

This video and a lot of the comments are really helpful in learning the process. Those larger bits are as expensive as hell.

Interesting video!.. Thank you

Cool

Guess we all do it but when I was a lad we were told not to use the side of a grindstone. Any advice, please? Thanks!

Great insight. Penetrating oil (AKA Witch Piss), heat, and patience. Thanx.!!

Method 3: Find an old engineer and let him teach you how to sharpen drills. No jig required, works 100%

Great what do you do with the very small drills , sizes below 1/16 it’s been a problem!

تسلم الايادى روعة ما شاء الله اشكرك

No one has picked up on the fact that the drill is running backwards at the beginning,no wonder it won't bite.

The leading edge of each side of the drill has to project a bit further than the metal and trailing edge behind. You did that well in the first demo, but not in the second

That`s set the cat amongst the pigeons - and that was the improved method - plenty of comments though!

Grinding Wheels are not designed to grind on the side. They can cause great harm it they come apart.

A drill bit is properly sharpened when it puts out long shavings not small shavings. Plus he's not putting a relief edge on it

Yes, pilot hole and cooling.

For those who are obsessed with equal drill lip lengths, thinking this causes oversize holes, it does not. I have deliberately offset a 1.75"diameter drill in a Oliver drill pointer, by 1/32" in an effort to make it drill oversize holes. It didn't make a lick of difference. I have taken brand new drills out of the box and had them drill oversize, but I can't make it happen on command when I resharpen them. Maybe the secret is to grind one lip with no clearance and make sure the sharp lip is longer, it might produce an oversized hole.

Relief angle! Use yours eyes and grind it on your bench grinder, you'll soon find out when you got it right👍

wow 😯 super

I sharpen my drill bits on a belt sander. It works much better than a grinding wheel.

For a very primative shop this isnt terrible. If i did this in our shop id be walked out.

Others have pointed out dangerous habits, but I did not see the measurement to make sure each cutting edge is equal length, to center the point and reduce bit walk. Thanks for trying. Just refer to a manual next time.

Very nice

super

I was showed how to sharpen drills on the grinder only using thw wheel face for both angles. Takes practice but its just a small roll of the drill bit after the first angle is ground. Never use the side of the wheel as you show, I've seen them explode from improper use. Can get dangerosly messy

I know why your bits are dull. Have you ever heard of cutting oil? Try it you'll like it 😊

Lets see you sharpen those scissors now that u cut the coarse paper....

So this is the easy method you say .... Okay then, off to the shop I go.

The second method failed to provide clearance of the cutting edge. The first method achieves it automatically because of the roundness of the face of the wheel naturally removes more metal beneath the cutting edge to provide clearance.

Anyone that moves that slow has got to be union 😏

Perfect 0:56

To all the people who think the drill was turning the wrong direction. It didn't. It just looks the way if you video it and the frequency of camera shutter and the drill speed add up to make your brain "see" it turning the wrong way. Ever noticed in old Western movies the horse cart's wheels turning backwards? How could they? 😂

Nerver, NEVER use the side of the grindingwheel if you want to stay alive !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

All ok but don't forget to quench after each contact otherwise the cutting edge will soften and will not cut for long.

Put oil on the bit when cutting and it will last longer

A little bit of oil might help! If it's squeelin', it ain't cuttin'!

The cutting edges of a twist drill must be exactly on the same level to cut two equal chips from the workpiece. Also the relief must be equal behind the cutting edges. There is no way these can be achieved manually only.

helps if you set the speed right. For those who didn't notice, OP intentionally sped up the RPMs and slowed them at the end of the video. In other words: clickbait.

Good effort mate, but that sharpening can be improved. Cheers.

That’s kinda cool, but I think I’ll stick with the Drill Doctor.

I think you also unintentionally sharpened your scissors at 3:05 to boot😮

drilling without drill oil ?

You really should invest in a better quality grinder and true up the wheels. That looks like a piece of soft steel plate you're drilling and, if so, you should be throwing spiral chips out of the flutes when the bit is sharp, even without using cutting oil, which is highly suggested in this application as it will improve cutting, surface finish, and tool life.

i was taught it was bad practice to use grinding wheel on the side and not the face(for safety)

That sharpened drill is drilling phuked up...😂...chipping the swarth like a mad thing....

Use oil.

Honestly? You pay too much attention to 120°. Yes, the angle is correct from technical point of view of course. However not that important from drilling point of view. I can sharpen a drill bit in hands only much faster and sharper. Yeah, the angle is likely not 120 😅

what about lube for the drill tip??

Las brocas no de afilan de esa forma, así quedan redondas y no hacen hueco, el filo de lo debe sacar de ambos lados y no en circunferencia

Do that to a 1/16th bit....

How can you be sure that you aren't taking the temper out of the drill bit? Also, can you re-harden the bit to make the edge last longer? Thanks.

Very good video.

Easy method requires a die grinder. Which almost no one has.

This man was never a qualified turner/machinist.

A properly sharpened bit produces two identical size continuous shavings untill the pressure is released. If only one shaving or one smaller shaving stop the machine without releasing the pressure on the drill bit. Note the one cutting the biggest shaving and regrind that one.

I cannot watch anymore!!!

nice method useful

How does he know where the center of the drill bit is when he is grinding?

What's all this 120 degree thing about?? - OK if using 2 Nuts as a Gauge, but If using a Protractor, then the Ideal angle is 118 degrees.

Worked as well as the drill bits I got at the local hardware store. 😞

Basicially when you turn 50 youll be able to sharpen drill bits without a guide, sums it up right fellas?

I don't think that drill bit was that sharp. A sharp drill bit will produce those 'curly cues' from the steel if they're sharp enough, IMO

Hope you can sharpen scissors

So what's the easy part

Flabberglasting how you sharpen the drill by sharpening it, man !. Keep up with the good work.

Your grinding wheel is off-balance. Face it properly

Why no, no on the side? Ive done it for years.

I see a lot of comments and yes, using the side of the disc is very dangerous as the wheel can shatter. Only ever use the Outer Diameter of the wheel.

Your method may be GREAT, but please say what you're doing and why.

Cuts good when in right direction don't it

The first method you shown is correct, compared to the latter. The first method give a back clearance to the cutting edge The second method does not and will eventually cause heat build up in the drilling process. As the whole surface behind the cutting edge rides in the hole following the cut.

You seem to have went through a lot of trouble to sharpen that bit.

Never use the side of a grinding wheel it could shatter.

Why don't you use a pilot hole and some cutting oil?

I get really tired of people who make things more complicated than they need to be. In 40 years as a toolmaker I never did anything like this. Stupid.

Where’s the cutting oil? Sharp bit will dull first time without oil.

Don't use the side of the wheel It could cause it to explode sending high speed shrapnel A good tool rest, adjusted properly, practice n you should be able to aquire a good cutting bit(s)

Maybe easy if you own a lot of equipment.

less time and money to just buy a new one

Any machinist know you use cutting oil or any oil when drilling into metal.

Not bad, but i can get as good(or bad- i usually do) results freehand. (at 4.16 tip is not at 90degs to cutting edges).

If your drills are dull and no longer drill well, trying to drill in clock direction. Because at beginning of this video it is counter clock direction. Can compare with end of video, where right direction.

No sidewall grinding. You’ll know why when that sucker explodes.