Tag Archives: Saws

How to Cut Safely with a Diamond Blade and Handheld Saw

How to Cut Safely with a Diamond Blade and Handheld SawTo get ready for the ACE14 conference and for all the guys who get stuck down in the trenches cutting pipe, we’d like to offer this article on how to use diamond blades and handheld saws safely. It includes things what you should check before you start cutting and what you should do while you’re cutting. Follow them and stay safe!

Remember to visit us near the tapping competitions in Booth 2466 (PDF) at the ACE14 conference in Boston, MA from June 8 to 11! 

Before Cutting

  • Make sure that you’re well-rested. You’ll hold the saw closer to your body if you’re tired, which will increase your chances of injury if your saw kicks back.
  • Make sure you’re trained in how to hold and cut with your saw properly and safely.
  • If anyone’s helping you, make sure that they’re properly trained and know how to assist you properly.
  • Wear proper safety gear, including safety glasses and footwear, headgear, and eye and hearing protection. Avoid wearing anything that could get caught in the blade, like jewelry or loose clothes.
  • When cutting brick, block, stone, or concrete, use a respirator. It’ll protect you against lung diseases like lung cancer, silicosis, and pneumoconiosis.
  • Only cut materials recommended by your blade’s manufacturer. Using your blade on improper materials can endanger your safety and cause excessive blade wear and damage.
  • Don’t mount your blade on a saw that doesn’t meet the minimum requirements set by the blade’s manufacturer.
  • Don’t mount your blade on any type of machine other than those recommended by the blade’s manufacturer.
  • Don’t dry-cut unless your blade is specifically designed for dry-cutting. Dry-cutting with a wet-cutting blade can weaken the welds holding the blade’s cutting segments and endanger your safety.
  • Don’t use a wet-cutting blade without sufficient water. If you do, you’ll weaken the blade’s welds and endanger your safety.
  • When cutting with a wet-cutting blade, make sure that the blade has an adequate and continuous flow of water. Neither gravity feeds nor the “booster pumps” on your saw will supply enough water to a wet-cutting blade.
  • Make sure you feed the right amount of water to your blade. Too much water can cause blade polishing, while too little can turn the cuttings into a paste that can jam or bind your blade and cause kickback.
  • Use segmented blades instead of toothed blades. If you must use toothed blades, make sure that they have enough “tooth set”, or room between the sides of the blade and the sides of your cut, to prevent binding and kickback.
  • Never mount your blade on a saw with a higher RPM than that recommended by the blade’s manufacturer.
  • Make sure your blade is the right size for your saw and job.
  • Inspect your blade for damage, even if it’s new. Look for cracked segments or cores, missing or damaged segments, undercutting under the segments, warped cores, and damaged or out-of-round arbors. If you find any of these or any other kind of damage, the blade is unsafe to use. Throw it away.
  • Make sure your blade doesn’t have foreign or abrasive material on its sides. These can increase your blade’s thickness and friction during cutting, which can lead to binding and kickback.
  • Make sure the blade’s arbor hole is the right size for your saw’s shaft and is mounted between proper flanges. Don’t try to force it onto an undersized shaft, as this can endanger your safety and cause excessive blade wear. Don’t try to alter the size of the arbor hole.
  • Make sure the blade is properly supported on your saw’s shaft and doesn’t slip or wobble.
  • Don’t use an arbor hole bushing if you’re going to mount your blade on a high-speed saw.
  • Make sure your saw is in good working order, is safe, and complies with all safety requirements.
  • Make sure that your saw’s shaft bearings don’t have end or radial play.
  • Set your saw’s lead-off adjustment so that the blade will travel straight.
  • Check your saw’s pulley for excessive wear.
  • Tighten the V-belts on your saw if they need it.
  • Make sure the flanges are properly assembled, in place, of equal or proper diameter, don’t show excessive wear, and are clean and flat.
  • Make sure your blade is mounted correctly on your saw and spins in the right direction.
  • Hand-tighten the blade to your saw with a wrench that’s no more than 8″ long. Don’t tighten the mounting nut too much.
  • Make sure your saw’s blade guards are in place, undamaged, and properly secured. Don’t try to pull or tie them back or otherwise defeat them.
  • Check all the fluids in your saw.
  • Make sure you have enough room to make your cut safely. If you have to, establish a safe zone.
  • Make sure that the material that you’re going to cut is supported so that it won’t sag. This will prevent the material from pinching your blade, which can cause kickback.
  • Make sure that you’re aware of all hazards both before and during your cut.
  • Set your cutting depth to no more than 1/4″ greater than the thickness of what you’re cutting. Doing so will prevent your blade from contacting foreign objects once you cut through and will prevent kickback.
  • Don’t use a saw that’s too heavy for you to control.

During Cutting

  • Hold your saw firmly with both hands.
  • Don’t stand directly in line with your blade when starting your saw or during cutting. This will reduce your chances of being injured if your saw kicks back.
  • Before starting your cut, free-run your saw to make sure that it operates smoothly.
  • Make sure you can properly rest the saw’s shoe on the clamped, supported portion of your material before cutting.
  • Let the blade spin up to full speed before starting your cut.
  • If you’re re-entering a cut, align your blade first, then ease it into the cut to prevent binding and kickback.
  • Maintain your balance and footing at all times. Never cut on a stepstool or ladder or cut in an awkward position. Mount the saw on guide tracks if you have to cut above your shoulders.
  • Don’t lean into your cuts. If you lean in to your cuts, your body will be closer to your saw, which will increase your chances of being injured if your saw kicks back.
  • Don’t force your blade into your material. Your blade should be able to bite into your material and then continue cutting with nothing more than the weight of your saw. Forcing the blade can cause overheating, binding, or blade damage.
  • Take your time. Cut with a slow sawing or reciprocating motion.
  • Don’t cut or let anything touch the upper front quadrant of your blade. This will prevent kickback.
  • Use greater care when cutting material with foreign objects in it, like reinforced concrete. Your saw can kick back when the blade encounters these objects.
  • Don’t try to make your cuts in one pass, especially with dry-cutting blades. Use several passes until you reach your desired cutting depth.
  • Never let your blade overheat. Remove dry-cutting blades periodically and let them free-run to air-cool.
  • Don’t exceed the blade’s maximum RPM while cutting.
  • Make sure the material doesn’t roll, slip, or vibrate. These can all bind the blade and cause kickback.
  • Don’t grind with the sides of your blade unless your blade is designed for grinding.
  • Don’t pry or push material with your blade.
  • Make only straight cuts. Never twist, turn, or deflect your blade in the cut or make off-center, crooked, curved, or radii cuts.
  • Avoid long-term, repetitive cutting, which can tire you out. When you’re tired, you’ll hold the saw closer to your body, which will increase your chances of being injured if it kicks back.
  • Take your finger off the trigger or power switch after making a partial cut, if your blade binds up, if your saw stalls, or if power is interrupted.
  • Allow cut-off pieces to fall away to prevent binding and kickback.
  • Ease up on the saw near the end of your cut. This will prevent the blade from hitting the floor or foreign objects and prevent kickback.
  • After you finish your cut, keep your blade in the cut until it comes to a full stop.

Works Cited

Daily, Sean D. “From the Archives: How Do I Prevent Chainsaw Kickback and Circular Saw Kickback?” Desert Diamond Industries Blog. Desert Diamond Industries, 6 Dec. 2013. Web. 28 May 2014. < https://desertdiamondindustries.wordpress.com/2013/12/06/frequently-asked-questions-how-do-i-prevent-saw-kickback/ >.

Daily, Sean D. “Safe Dry-Cutting with Diamond Blades.” Desert Diamond Industries Blog. Desert Diamond Industries, 5 Mar. 2014. Web. 28 May 2014. < https://desertdiamondindustries.wordpress.com/2014/03/05/safe-dry-cutting-with-diamond-blades/ >.

“How Diamond Blades Work.” How Diamond Blades Work. Norton Construction Products, n.d. Web. 28 May 2014. < http://www.nortonconstructionproducts.com/application/diamond-blades.aspx >.

“Pavingexpert and Pulvex – Cutting with Diamond Blades.” Pavingexpert and Pulvex – Cutting with Diamond Blades. Pulvex, n.d. Web. 28 May 2014. < http://www.pavingexpert.com/diamond_blades_01.htm >.

“Safety Tips When Dry Cutting With Diamond Blades.” Safety Tips When Dry Cutting With Diamond Blades. ChinShine Diamond Tools Co., Ltd., n.d. Web. 28 May 2014. < http://www.diamond-blade.org/technical-article/2013/1116/110.html#.U4XoqfldV8E >.

“Wet Cutting – Diamond Blades.” Wet Cutting – Diamond Blades. Norton Construction Products, n.d. Web. 28 May 2014. < http://www.nortonconstructionproducts.com/solutions/wet-cutting.aspx >.

From the Archives: Changing the Drive Belt on a Husqvarna Cut Off Saw or Fire Rescue Saw

From the Archives: Changing the Drive Belt on a Husqvarna Cut Off Saw or Fire Rescue Saw

Courtesy of Brotherhood Instructors, LLC

We’ve gotten a lot of interest lately about cut off saw and fire rescue saw maintenance, so we decided to repost this article on changing a Husqvarna K970 saw’s drive belt. Tell us what you think!

Knowing how to change the drive belt on your Husqvarna cut off saw or fire rescue saw can improve your cutting performance and extend your saw’s life – in other words, save you time and money. Husqvarna has put out a helpful video showing you how to do just that.

The cut off saw shown here is a Husqvarna K970 saw. However, you should be able to use this procedure on any of Husqvarna’s K970 or K760 saws, like the Husqvarna K760 fire rescue saw and K970 fire rescue saw.

Regular readers of this blog may recognize some of these steps from our partner Brotherhood Instructors, LLC‘s video on how to convert a Husqvarna fire rescue saw to outboard cutting. That’s good news for you, because if you can do that, then you can certainly do this.

How to Keep Saws and Other Fire Rescue Equipment Running, by Firefighter Nation

Keeping Saws and Other Fire Rescue Equipment Running, by Firefighter Nation

Photo courtesy of Brotherhood Instructors LLC

You’ve got a lot of things to do as a firefighter, and calls are only one of them. You have to train, maintain your certifications, fill out paperwork, do truck and inventory checks… Maintaining your equipment is probably the last thing on your mind.

David Cain over at Firefighter Nation gets it. He was deputy chief of the Boulder, CO Fire Department for over 30 years, so he knows that firefighters don’t have enough hours in the day. Unfortunately, that’s not an excuse.

“We demand more out of our gear than practically any other profession,” he writes, “because if it fails, it can cost a whole lot more than just money.”

Cain has a number of tips for keeping your equipment, like your saws, ready for action. Not only will these tips will save your department money replacing broken-down equipment, they might also save your life:

  1. Start and run your equipment regularly.
  2. Schedule your equipment inspections, like your other checks.
  3. Take care of any small problems that you find immediately, before they become big problems.

Read the rest of Cain’s article over at Firefighter Nation.

Firefighter Nation, David Cain, “How to Prolong Fire Department Equipment Life

How to Defeat Roll-Down Gates during Forcible Entry, By Fire Engineering

Forcing Locks on Commercial Roll-Down Gates, By Fire EngineeringDo the storefronts in your fire district have roll-down gates? They do in New York City, too, so the New York City Fire Department has had plenty of practice forcing them.

FDNY Lt. Mike Ciampo demonstrates several ways to force roll-down gate locks with a power saw in this Fire Engineering video. (You may remember Ciampo from another video that we posted on carrying saws safely up ladders) If you prefer to use halligans, he also demonstrates how to pry locks off gate channel rails. Watch this video now.

Fire Engineering, Rolldown Gates

Saw Arbor, Cutting Depth, and RPM Chart

Saw Arbor, Cutting Depth, and RPM ChartWondering about your saw’s arbor or the cutting depth and maximum RPM of your blade? Wonder no more! We’ve gathered cutting depth and RPM data from Husqvarna and our own saw arbor data and gathered it all into one handy document. Download it for free today!

Recommended RPMs, Tool Arbors, and Cutting Depths by Desert Diamond Industries (PDF)