How to make surgical instruments last

Surgical instruments today are not made to last. I see more and more “instrument pitting.” Pitting a short for “pitting corrosion.” This results in small holes in the metal making it weaker and more likely to break.

What causes pitting corrosion?

For a defect-free “perfect” material, pitting corrosion is caused by the environment–how instruments are stores, how much moisture is in the air, etc. These conditions can contain chemical species such as chloride. Chloride is particularly damaging to the passive film–oxide–so pitting can initiate at oxide breaks.

How to protect your instruments?

I discovered how to remove the pitting before it can destroy the instrument. By removing the pitting on the surface back to the original surface of an instrument will prolong the life and save you from buying new instruments.

Sharpeners Report publishes story about harmonic treatment

In the January issue of Sharpeners Report, Judy Brenner interviewed Randy Kinney and me on the new harmonic treatment we are using to strengthen metal for sharpening. We are very excited about the attention that this process is receiving. If you have any questions about our harmonic treatment or want to try the service for your own instruments, give me a call at 800-972-9223 or email me at You can also visit my webpage dedicated to explaining the harmonic treatment in more detail:

Here is the article from Sharpeners Report:


Add-on treatment for shears, clipper blades, machine tools

by Judy Brenner

Did you know that there are microscopic fissures, gaps and cracks hidden in the surfaces of metallic tools and instruments? These cause the metal to underperform and wear at a faster rate. DRK Technologies has developed a process whereby “The MicroEdge” removes such defects, enhancing a tool’s performance and extending its lifespan by 300-500 percent, according to co-owners Randy Kinney, DRK Technologies, Knoxville, TN and Dean Koeneman, DK Industries, in Kentucky.

This treatment penetrates all the way through the steel. The experiments have been going on for more than a year, and now are ready to market to other sharpeners and end users. Price points are still being established, but considering the process is said to triple the life of a blade edge, it has been suggested $65 for shears; $10 for dental instruments; and $12 for clipper blades. Machine tools vary, based on volume.

“This metal treatment not only increases the lifespan of a device, but also, improves its maneuverability and cut. Cracks within an instrument allow it to flex and move. But once these gaps are closed, the tool will perform with finer precision,” Randy said.

Typically, the outer layer of an instrument suffers the greatest amount of stress after heat-treatment. Each time an untreated tool is sharpened, its outer layer is removed, requiring the tool to be recoated after each regrinding. But The Micro Edge eliminates the need for coatings altogether, allowing for twice the number of regrinds. “Once an instrument undergoes The Micro Edge treatment, achieving the desired level of sharpness will require removing less material from the cutting edge,” Randy says. His other company, Knoxville Blade Sharpening & Bio Med Repairs, has tested the process on behalf of customers. “We’ve been giving tools to clients since May 2016, and the feedback has been very positive,” he said. Sharpeners Report sought out some opinions to see what end users thought. Here’s what was reported.

Shears Tested by end users

Kim Hodges, Shear Techniques, has a 3-chair salon in Halls, TN. “We had our scissors treated with the metal edge treatment by DKR Technologies. Our Japanese steel 5 inch beauty shears are used for both blunt and point cutting. We could tell it was an amazing difference. It glides through the hair better,” Kim said. She went on to say: “We don’t drop our scissors. You don’t see the difference, but you can feel it. When you open and close them, when you are cutting hair, sometimes we try to keep oil on blades, sometimes when it is time to get them sharpened, it was nipping at the hair. Now we’ve treated them six months ago, we normally have them sharpen every 3 to 4 months. These are still sharp and working quite well. We were called to see if we need them sharpened and we don’t. They are still working beautifully.”

Todd Bauer in Louisville, KY is a former platform artist with Aveda, and said he was impressed. “I was quite surprised! These seem more precise. I was blown away,” Todd said, after getting one pair of his shears treated. Todd uses the 6” Hakuri shear daily, doing 10 haircuts a day. He owns 15 of the same brand shears, and he said he mostly can’t tell these from a new pair, which is still in the wrapper. “I haven’t needed the new pair at all!”

Dental Instruments Tested by end users

Tara Perry, a hygienist who works with Dr. Mark Luck in Knoxville, owns a traditional tool assortment of scalers and more. She said normally they sharpen the instruments themselves on different stones. “It takes a lot of time out of your day, so I don’t mind having a professional service handle them,” Tara said. She explained there are high end stainless steel instruments and 2nd tier cheap ones. “The techniques and coating used by Kinney Surgical made my 2nd tier instruments last as long as the higher quality ones!” She said working with a sharper tool “saves my wrist!” (Carpal tunnel is prevalent among hygienists, she said.)

The micro edge process is also applicable to clipper blades and machine tools, specifically any cutting tool such as end mills, drilling broaching, punch & dies, and some others that have abrasive wear. More information will be available during the Sharp Fest where DRK Technologies will have the Micro Edge exhibit.


Try DK shear renewal system

You love your old shears. You love how your old shears feel in your hand. You love how they use to cut, but now they don’t preform like they use to. They just aren’t as sharp and they don’t hold an edge

The DK Shear Renewal System re-animates your favorite shears in 5 steps:

  1. The harmonic treatment to re-temper the steel.
  2. Polish the surface of the shear.
  3. Rework the set and balance of the shear.
  4. Sharpen and hone to a razor sharp edge.
  5. Guarantee satisfaction.

For more information about the DK shear renewal offer, please contact me by calling 800-972-9223 or by emailing

Getting That Edge

Here is the unsharpened (on the left) next to the sharpened edge (on the right).

Here is the unsharpened (on the left) next to the sharpened edge (on the right).


The honing process not only removes micro burrs that is left behind after sharpening an edge, but moves the molecular of the steel closer to gather, leaving not only a sharper edge but a stronger edge.  The result is a stronger and sharper edge that will last longer.

When we use this honing process on your precision cutting scissors edge, outside and inside edge, your scissors cutting action will be smoother and silky feel while cutting effortless through the hair, longer.

DK industries is the only company that uses the same equipment that the inventors used, the Japanese.  We use both the honing wheel and compound. No one else has this equipment.


Shears Care and Maintenance

Shear maintenance and care are the least time consuming parts of any stylists’ week and yet they are a very important part, a part that many neglect. Shears and clippers are a stylists’ most important tools and taking those few extra steps and a few moments of your time can save you much time, money, and agrevation. As we have seen in the field the stylist who takes the time to care for his/her shear properly can expect it to stay performing 2 to 3 times longer than the one who does not. Listed below are some general guidelines and suggestions which can do just that, save you time, money and agrevation!!

Oil your shears weekly.

It only takes a few drops applied at the pivot points of your shear weekly to help keep unwanted hair and debris from sticking under junction point. This leads to smoother operation, prevents scratches in ride line and leads to less variance in shear tension.

Knowing how to adjust shear tension and checking the tension regularly.

  A shear that is loose–no matter how sharp–can lead to hair bending. A shear that is set tight leads to premature dulling and scratching. Without good tension, you end up with a rough operation and a shear that is in constant need of sharpening.

To set tension, hold the right handle in your right hand and gently open shear with left hand most of the way. Let go of the left handle and let shear close where it will. If properly tensioned, your shear should not close all the way. It should stay open approx. 1/3 to 1/2 of being fully opened. Having clean and oiled shears is essental to properly adjust tension. Set tension with tension knob or screw tensioner. Remember it only takes a couple of clicks of your knob or a slight turn of your screw.

Wipe shears down.

Gently wiping shear blades off in-between cuts remove excess hair and debris such as hair sprays and gels. This helps you keep the pivot point of shear clean and also keep you from re-cutting the same hair over and over. Plus, you want your customers to see your clean shears.

Always keep shears stored in a case or seperate area of drawer with towel or something soft.

Nicks in the underneath side of blade are a shear’s performance worst enemy. When setting shears on counter or cart after cutting, make sure blades are closed and not open to prevent the underside of shear from rattling around and causing nicks. Shears stored in a drawer rattling around with everything else tend to always be having problems due to the nicks this causes in underneath side of blades.

Other important tips:

Avoid draoppage by setting shears in a secure spot where the likely hood of accidently hitting and knocking off station is reduced. Clean shears lead to less dropage.

Do not spray chemicals on shears which may lead to pitting or corrosion,etc. Simply wipe off with clean water and soft towel and re-oil.

If shears are nicked try to avoid useage as the longer you use a nicked shear the deeper the nick gets thus the more material you must remove during sharpening to restore shears edge. Less material removed leads to longer shear life.


The two single most important factors in reliable clipper/trimmer operation is to avoid dropping and to keep blades well oiled with a good clipper oil. We suggest real clipper oil not combination cleaners/lubricants that comes in a spray can.

If you’re working in a regular salon enviroment and using clippers and trimmers daily, we suggest oiling the blades daily. Apply oil to the parts of blade where there is metal to metal contact. It only takes a moment.

If you’re working in chain shop or barber enviroment we suggest 2 to 3 times a day oiling. Keep blades brushed off of excess hair with blade brush provided at purchase. Regularily make sure to unravel all cords, to help avoid cord problems and be more user friendly. Know how to keep blades adjusted and aligned.

If you ever have any questions, just let us know. We can show you how to adjust your particular clipper/ trimmer.

“Innovative By Tradition”

Tradition is good.

Innovation is better.

And the right combination of the two. . . the best

“Innovative by tradition” has been TONDEO’s recipe for success for more than 80 years. Today TONDEO is one of the world’s leading manufacturers of hairdressing shears. Their shears and razors are convincing in terms of technology and design. They are specifically tailored to your requirements. Even in the manufacture of these little “masterpieces,” TONDEO relies on the right combination: state-of-the-art machines and precise hand work, technologies and years of know-how allow high-quality unique items to be created.