I'm a DIYer, and I like to do as much of my own home maintenance as possible. That's why I've found myself in the situation where I need to know how to resharpen masonry drills. The answer is that you can resharpen them, but it's not guaranteed to work and there are some steps you should take first before attempting this yourself.
It is possible to resharpen masonry drills, but whether the process will be worth having tried is another matter.
Since the drill bits are so hard, any attempt to sharpen them will almost certainly result in broken tips. However, there are ways that you can extend the life of your drills and make them work a little better for you.
First, you need to identify if your bit has become dull or damaged from use. If you have been drilling into brick or stone floors then chances are very good that it has already begun to dull and wear out before now. Check this by looking at how much material was left behind on each hole before drilling with a new one - if there was always several millimeters left behind between where it started digging into something solid then expect this process could extend even longer than expected because of how hard these materials tend to be when compared with softer metals such as iron which would allow more time between needing replacement due only being able to cut through easily rather than requiring such frequent attention without risking breaking off its tip completely (you might still wish reconsider using carbide tipped ones).
Some diamond sharpeners are sold with manufacturers' recommendations that they can be used to sharpen masonry drill bits. However, this is not the case for all diamond sharpeners. For example, one manufacturer recommends using its diamond sharpener only on carbide-tipped tools, while another manufacturer says its tool may damage masonry drills if used improperly.
A third company sells a specific product designed specifically for sharpening tungsten carbide tips (this product is not multi-purpose). While some companies maintain that all tungsten carbide tipped tools can be sharpened using a standard bench grinder, others say otherwise: according to them, you need specialized equipment to grind down your bits and then polish them until they're smooth enough again so that they won't get stuck in your workpiece during use.
If you are using a tungsten carbide tip drill, avoid using coarse diamond grit sharpeners to remove burrs. These will wear away metal very quickly and can do more harm than good. It is better to use a finer grit sharpener that doesn't remove as much material each time.
You can resharpen the tungsten carbide tip of your drill bit with a diamond sharpener. If you have an angle grinder, that's great, but if not then you'll need to use a hand-held sharpener or some other type.
Use a fine grit with your sharpener to leave the tip smooth and less likely to damage whatever material you're drilling into. Hold your bit at an angle of around 60 degrees when drilling, or else it will cause more friction and heat up too much.
The best way to sharpen the drill is with a grinding wheel at low speed with the bit held at an angle of around 60 degrees.
You can resharpen your tungsten carbide tipped masonry drills if you go about it the right way, but it's not guaranteed to work. The best way to sharpen the drill is with a grinding wheel at low speed, holding the bit at an angle of around 60 degrees. This allows for even wear on both sides of the tip and improves its durability. You can use a diamond sharpener as well, but this will wear away metal quickly and leave you with less material than you started with.
You can use a regular bench grinder to sharpen the drill. Just make sure you true up the face with a diamond file before grinding. If not, the drill will soon overheat and blunt.
The best way is to use a diamond dresser to create a new cutting edge and then grind off the remainder of the drill which is blunt with a bench grinder. This can also be done by using a bench grinder as others have said. But make sure you true up the face with a diamond file before grinding, otherwise you'll just end up with another blunt edge after grinding.
If you're looking to sharpen masonry drills, it's best to do so with caution. If you're willing to risk ruining your drill bit, then go ahead and try using a diamond sharpener on it. If not, then you can always send it off to an experienced professional (or check out our guide on how they do it).