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First of all, remember that a diamond blade is different from a knife blade or toothed saw blade. Because of this, it won’t have dull edges or dull teeth when it’s worn out. (In fact, we’ll bet that your diamond blade’s cutting segments look dull whether they’re worn out or not)
That’s because a diamond blade cuts with the diamonds impregnated into its cutting segments. These diamonds wear down during cutting, despite being one of the hardest substances on earth. When these diamonds are worn out, then your diamond blade is worn out, and you’ll need to replace it .
How can you tell this? Simple. Before your diamond blade is worn out, it’ll cut slower and slower and eventually won’t cut at all . You should also look at the blade before you start cutting to see if the blade core has worn-out spots  or if the cutting segments have completely worn down .
Keep in mind that you can’t always gauge the life of your diamond blade by its cutting speed. Some blades will become “glazed over” if they’re too hard for the material that you’re cutting. You can usually restore these blades by running them through something abrasive, like asphalt, instead of trying to replace them . In other words, the best way to determine if you need to replace your diamond blade is to look at it.
Did this article help? Let us know in the comments section!
 “How Do Diamond Blades Work?” Desert Diamond Industries Blog. Desert Diamond Industries, 27 Aug. 2013. Web. 10 Dec. 2013. < https://desertdiamondindustries.wordpress.com/2013/08/27/how-do-diamond-blades-work/ >.
 Wang, Hanjiang. “FAQs for Tile Saw Blades.” Diamond Blade Select. N.p., 19 Sept. 2009. Web. 10 Dec. 2013. < http://www.diamondbladeselect.com/tool-faqs/faqs-for-tile-saw-blades/ >.
 “Making the Cut – A Diamond Blade Work Wonders.” ToolGuy.com. N.p., n.d. Web. 10 Dec. 2013. < http://www.toolguy.com/diamond-blade.html >.
 “All Purpose Diamond Blade – Cutting Tips & Specifications.” Fire Rescue Blades of Delray Beach, Inc. N.p., n.d. Web. 10 Dec. 2013. < http://www.firerescueblades.com/resources >.
 “Frequently Asked Questions.” Desert Diamond Industries. N.p., n.d. Web. 10 Dec. 2013. < http://www.desertdiamondindustries.com/frequently-asked-questions.php >.
This article on restoring worn out and glazed over diamond blades is from our archives. What do you think? Let us know in the comments section!
There are two main reasons why your diamond blade is cutting slower or has stopped cutting: it’s either worn out or glazed over.
A worn out diamond blade should be replaced, period, end of story. You shouldn’t try to squeeze a few more feet out of a worn out blade, because a worn diamond blade is more likely to break or cause life-threatening accidents. If you’re using a Ductile Iron Safety Blade, Fire Rescue Safety Blade or Ductile Iron Ring Saw Safety Blade, see this article on Safety Blade wear patterns to see if your diamond blade is worn out.
A glazed over diamond blade, on the other hand, still has life in it and doesn’t need to be replaced. All you need to do is “dress” it by running it through an abrasive material – like asphalt, sandstone, masonry block, or a dressing stick – to restore its cutting speed.
Keep an eye on your diamond blade if it gets glazed over, though. If it glazes over again after you dress it, then your diamond blade may be too hard for the material that you’re cutting. You can dress it again if it becomes glazed over again, but repeated dressings can slow down your cutting, not to mention make your diamond blade become worn out faster. If you find yourself repeatedly dressing your diamond blade, consider getting a softer one.
So why is your diamond blade becoming glazed over? To answer that question, we first have to explain how your blade is supposed to cut.
Your diamond blade has cutting segments comprised of diamond grit mixed within a metal matrix or “bond”. When we talk about hard and soft blades, we mean the hardness or softness of this bond.
The diamond grit on the surface of the cutting segment’s bond does the cutting. All the bond does is hold the grit on the blade. Ideally, as the grit on the segment’s surface wears down during cutting, the bond wears down, too. This sheds worn surface grit and exposes fresh, sharp diamonds deeper within the cutting segment. When this process works, your diamond blade cuts at more or less the same rate throughout its life.
You run into problems, however, when the bond of your diamond blade is too hard for the material that you’re cutting. When this happens, the surface grit wears down faster than the bond. If this surface grit wears down too much, then your diamond blade becomes glazed over and stops cutting. Dressing restores the performance of your diamond blade by wearing down the bond until it sheds worn surface grit and exposes fresh diamonds.
To avoid having your diamond blade become glazed over, you should, as a rule of thumb, cut hard materials with a soft blade. That’s because soft bonds wear down faster in hard materials, allowing your blade to shed worn diamonds faster, expose fresh grit faster, and avoid becoming glazed over.
For more information, visit Desert Diamond Industries’ frequently asked questions page.
“Frequently Asked Questions.” Desert Diamond Industries. Desert Diamond Industries, n.d. Web. 29 Nov. 2012. <http://www.desertdiamondindustries.com/faq.php>.
This article is from our archives. Let us know in the comments section if you found it helpful or interesting!
A diamond blade or diamond grinder differs from an abrasive blade or abrasive grinder in its construction. This may not sound like an important difference, but it can affect both your health and your safety.
An abrasive blade or abrasive grinder has extremely hard materials like silicon carbide and/or aluminum oxide bonded with resin and mesh into a disc. When spun at high speed, these hard materials wear away the material being worked, producing a ground surface or a cut.
This kind of construction has several disadvantages: it wears away quickly, grinds or cuts slowly and produces massive amounts of sparks during grinding or cutting. More importantly, an abrasive grinder or abrasive blade can threaten your life and your health.
An abrasive blade or abrasive grinder can endanger your life because it can shatter during grinding or cutting and spray you with fragments that can injure or even kill you. The Occupational Safety and Health Administration (OSHA) has numerous reports of injuries and deaths caused by shattering abrasives. You can view some of these reports here, here, here, here, here, here, here, and here.
An abrasive grinder or abrasive blade can also endanger your health because it emits silicon carbide fibers during grinding or cutting. According to the New Jersey Department of Health, silicon carbide can cause a chronic lung disease called pneumoconiosis with long-term exposure, and there’s limited evidence that silicon carbide can cause lung cancer, at least in animals (PDF). Additionally, silicon carbide workers have reported increased mortality from asthma, emphysema, chronic bronchitis, pneumoconiosis, and lung cancer, according to OSHA.
A diamond blade or diamond grinder, on the other hand, has diamond particles attached to a steel core. Because it’s made of steel, a diamond grinder or diamond blade is generally safer than an abrasive grinder or abrasive blade and won’t shatter or emit silicon carbide fibers during cutting and grinding.
Keep in mind, however, that not all diamond blades are the same! A common kind of diamond blade has diamond cutting segments welded onto a steel core. These welds can soften and break during extended cutting. If they do, the segments can fly off and strike the operator, causing injury or death like an abrasive blade.
For this reason, you’ll want to avoid using a welded diamond blade and use a solid steel diamond blade or diamond grinder. A solid steel diamond grinder or diamond blade might bend during cutting, but it won’t break, increasing your safety. After all, you deserve to go home at the end of the day, instead of the emergency room or the morgue.
For more information, visit our FAQ page.
Works Cited after the break.
Do you have questions about diamond blades? Find answers to them on Desert Diamond Industries’ Frequently Asked Questions page! Our FAQ has most of the answers that you need about diamond blades in one convenient place, including:
- Whether you need water feeds when cutting with diamond blades
- What to do if your diamond blade isn’t cutting
- The benefits and drawbacks of different diamond blade designs, including vacuum-brazing
- Diamond blade and worksite safety, including eye, ear and hand protection
Can’t find answers to your questions on our FAQ page? Don’t despair. Just call us at (800) 654-5890. We have answers to your questions, and we’d love to talk to you.