Drill Bit Sharpener Guide: Drill Doctor and the Alternatives

Most home shops should buy the Drill Doctor 750X. It is the drill bit sharpener that covers the widest bit range. It also handles split points and multiple angles without extra parts.

Both machines get a deeper model by model look in our Drill Doctor lineup review.

Buy the smaller 500X if you rarely go past half inch bits. Skip both machines and freehand on a bench grinder if your budget is near zero. This guide compares all three paths, plus a cheaper grinding attachment.

We do not run our own lab tests here at Edge and Grit. We rely on manufacturer specifications and what owners report after real use in their own shops.

What Actually Matters in a Drill Bit Sharpener

A good drill bit sharpener needs to do three things well. It has to cover the bit sizes you actually own. It has to hold a consistent angle every single time.

Split point capability matters most if you drill much steel or hardened material. A split point bit centers itself instead of walking across the surface first. Not every cheap sharpener can add a split point after the fact.

Material compatibility is the third piece to check. High speed steel is easy for almost any machine to grind. Carbide and masonry bits need equipment rated for them specifically.

• Bit size range you actually use, not the range printed on the box
• Split point ability, since most modern bits ship with one
• Angle adjustment, fixed presets versus a dial you can fine tune
• Material list, especially carbide and masonry if you drill concrete or tile
• How much practice it takes before results stop looking amateur

Cost per sharpened bit is worth thinking through before you buy anything. A machine pays for itself fastest in a shop that dulls bits weekly. A shop that sharpens twice a year gets less value from the same purchase, no matter how good the machine is.

Drill Doctor 750X vs 500X

Both models share the same core mechanism from the same maker. The manufacturer lists a bit range of 3/32 inch to 1/2 inch for the 500X. That expands to 3/4 inch with an optional large bit chuck.

The 750X ships with that larger chuck already included. It covers 3/32 inch to 3/4 inch right out of the box. That is the single biggest practical difference between the two machines.

Both support a standard 118 degree point and a 135 degree split point. The 750X adds finer custom adjustment between 115 and 140 degrees. That matters if you dial in your exact point angle for a specific job.

The manufacturer lists both models as capable of sharpening high speed steel, cobalt, black oxide, titanium coated, carbide, and masonry bits. The 750X adds a variable material take off knob. That knob controls how much metal it removes per pass, and it is the main reason serious hobbyists step up from the 500X.

Coated bits lose their surface coating during sharpening on either model. That is normal wear from grinding, not a defect. Cobalt bits hold up better since the cobalt is mixed into the steel rather than coated on top.

The General Tools Grinding Attachment

How Long Sharpening Actually Takes

A single bit on a Drill Doctor takes a minute or two once you know the machine. Add setup time the first few sessions while you learn the chuck and the angle dial.

Freehand takes longer per bit, even for an experienced hand. Expect several attempts per bit early on, since checking and rechecking the edge is part of the process.

The General Tools attachment sits in between. It is faster than pure freehand but slower than a powered machine, since you are still doing the grinding by hand.

Bench Grinder Freehand: The Free Option

Freehand grinding costs nothing beyond a bench grinder you likely already own. It also demands the most practice of any option covered here. There is no jig correcting your angle, so consistency comes purely from repetition.

We cover the actual technique step by step in our full freehand walkthrough. That guide includes how to check your result once you think a bit is done. Read it before you touch a bit to the wheel.

Freehand fits anyone sharpening occasionally who is willing to trade time for cost. It fits a busy shop far less, since results take longer to get repeatable.

When Replacement Beats Sharpening

Cheap bits are not always worth saving. A box store twist bit often costs less than the time it takes to sharpen it well. Save your sharpening effort for bits that actually cost real money.

If a bit is already badly chipped or visibly bent, sharpening will not fix the underlying problem. Replace it instead of forcing a machine to compensate for damage.

For a mixed bit collection, a workable rule is this. Sharpen anything over a few dollars a bit and replace anything cheaper than that. Consider sending specialty bits out to a service if you would rather not own equipment at all.

Getting Consistent Results

Practice on junk bits before touching anything you care about. Every machine and attachment covered here has a learning curve, even the automated ones.

Clean the chuck and guide surfaces regularly. Metal dust builds up fast and it throws off angle accuracy over repeated uses.

Check your result under good light before calling a bit done. A centered, even edge matters more than hitting an exact angle number on paper.

Mistakes to Skip

Do not skip the practice bits. Your first few attempts should never be on bits you actually need.

Do not assume every attachment handles carbide or masonry. Grinding the wrong material can damage cheaper equipment fast.

Do not chase a perfect angle number if your work does not need one. A centered split point often beats a technically perfect angle that sits off center.

Do not buy the largest machine just because it exists. A 750X sitting mostly idle is a worse purchase than a 500X or attachment that actually gets used.

FAQ

Is a Drill Doctor worth it for a home shop?

Yes, if you sharpen bits often enough that the time saved outweighs the cost. Occasional users may get more value from freehand grinding or a basic attachment instead.

What is the difference between the Drill Doctor 750X and 500X?

The 750X covers a wider bit range out of the box and adds finer angle adjustment. It also includes a material take off knob that the 500X does not have.

Can a drill bit sharpener handle carbide bits?

Both Drill Doctor models list carbide as supported per the manufacturer. Always confirm compatibility before running a carbide or masonry bit through any attachment.

Is freehand sharpening on a bench grinder good enough?

Freehand can produce a usable edge once you have practiced the technique. It just takes longer to get consistent than a jig or a dedicated machine does.

When should I just replace a drill bit instead of sharpening it?

Replace cheap bits that cost little more than the time it takes to sharpen them. Chipped or bent bits are usually better replaced outright than reworked.

Does sharpening remove the coating on coated bits?

Yes, black oxide and titanium coatings come off the cutting edge during sharpening. This is expected wear and does not mean the bit is ruined.

How long does it take to learn a Drill Doctor?

Most owners report a real adjustment period across the first several bits. Practicing on cheap or worn bits first shortens that curve considerably.

Need the broader picture before you commit to one tool? See our full lineup of tool guides, or check our reference for common angle settings before you set up any machine.