How to use a circular saw
Updated: 21 October 2026
You have the saw on the bench, and the next ten minutes are about the cut rather than the brand. Kickback, a blade set far too deep, and a lower guard that does not spring back are how a circular saw injures people at home. This page is the order: power off while you set the shoe, the board supported so the kerf cannot close, then one pass at full speed with your body off the line. It was written on 20 October 2026 from UK guidance, not a lab. The [circular saw comparison](/hub/power-saws/circular-saw) scores the listings. Products Compared may earn a commission if you buy through an amazon.co.uk link, at no extra cost to you.
You have the saw on the bench, and the next ten minutes are about the cut rather than the brand.
You have the saw on the bench, and the next ten minutes are about the cut rather than the brand. Kickback, a blade set far too deep, and a lower guard that does not spring back are how a circular saw injures people at home. This page is the order: power off while you set the shoe, the board supported so the kerf cannot close, then one pass at full speed with your body off the line. It was written on 20 October 2026 from UK guidance, not a lab. The circular saw comparison scores the listings. Products Compared may earn a commission if you buy through an amazon.co.uk link, at no extra cost to you.
Our top picks
| Badge | Product | Depth at 90° | Supply | Weight | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  DEWALT DeWalt DCS391 165 mm | 55 mm | 18 V bare | 2.9 kg | 8.6 | about £95.00 | View offer |
 Evolution Power Tools Evolution R185CCSX with track | 64 mm | 1,600 W corded | 5.1 kg | 8.8 | about £116.00 | View offer | |
| Best value |  GALAX PRO GALAX PRO 1,400 W 185 mm | 62 mm | 1,400 W corded | 4.06 kg | 7.0 | about £38.99 | View offer |
On this page
A hand-held saw is not a saw bench
Search “circular saw safely” and the first official pages are often about a saw bench. HSE’s WIS16 talks about a riving knife within about 8 mm of the blade, a push-stick, and a long take-off. That machine is a table: you push timber into a fixed cutter. A hand-held circular saw is the other way round. You move the shoe, the lower guard covers the teeth until the cut opens it, and there is no bench riving knife to set. Copying the 8 mm figure onto a handheld shoe would be a false instruction. BS EN 62841-2-5:2014 covers this class of tool. You need the guard to return, the shoe flat, and a blade that matches the material. At work, wood dust is a COSHH matter: HSE’s eight-hour limits are 3 mg/m³ for hardwood and 5 mg/m³ for softwood. At home the dust is still not for dry sweeping. A dust port is not extraction. The Noise Regulations 2005 set work action values at 80 and 85 dB(A). Put defenders on. Choosing the saw is on the circular saw buying guide.
Set the saw before it is plugged in
Mark the line, clamp the work, and take the plug out or the battery off before your fingers go near the teeth. Set the depth so the teeth project about 5–7 mm through the underside. That figure is Machine Mart’s guidance for a portable circular saw, not a British Standard measurement. More blade below the timber means more exposed tooth if the saw kicks. Check the bevel is at zero unless you meant an angle. Cycle the lower guard by hand, still unplugged. It should spring back over the blade. Do not tie it or pin it open. If it sticks, stop. One UK review of the Enventor says the blade does not brake when the switch is released, so wait until the teeth have stopped before you set that saw down. The CS1200’s spindle lock is for blade changes with the power off. The DCS391 has a lock-off. Use it. Electrical Safety First expects a UK 3-pin plug and a lead that cannot fall into the blade. A bare 18 V saw still has a battery to remove before you touch the teeth.
Support, stance and the pass
Both sides of the cut need support. If the offcut droops, the kerf closes, the blade pinches, and the saw can jump back. Two sawhorses, or a bench with the waste free to fall, is the ordinary setup. Stand to the side of the blade, not behind it, with both hands on the saw and the shoe flat. Do not twist back onto a pencil line you have left. A straight edge clamped to the work, offset by the distance from the blade to the shoe edge, is how a first cut stays straight. Measure that offset. It is not the same on a 150 mm Ryobi and a 190 mm DeWalt. Start the saw in the air and let it reach full speed before the teeth touch. Feed steadily. Keep a corded lead behind you. At the end, release the trigger and wait until the blade stops before you lift the saw. A long rip in ply is on circular saw for plywood.
Smoke, binding and when to stop
Smoke on the timber usually means a dull blade, a closing kerf, or a twist. A wood blade in metal, or a saw whose listing forbids metal, will smoke and can throw a tooth. Stop, remove the power, and look. Do not push harder through the last inch. Kickback on a handheld saw is that pinch or that twist. The fix is support and a sharp blade of the right type, not a bench riving knife you do not have. A guard that will not return, a saw that has shed a part, or a motor that smokes is the end of the job. Structural timber and metal beyond the stated thickness are reasons to call a joiner. The Consumer Rights Act 2015 is not a reason to finish the cut with a guard that sticks. Which body you are holding is on the best circular saw UK page.
Common questions
How far should the blade stick out under the wood?
About 5–7 mm past the underside, which is Machine Mart’s figure for a portable circular saw. It is guidance, not a British Standard measurement. A US “quarter of an inch” is a similar rule from a different market. You set it with the saw unplugged, on the thickness you are about to cut, not on a guess from the last board.
Why does the saw jump or smoke?
The usual causes are a kerf that closes because the offcut is unsupported, a twist back onto the line, or a dull or wrong blade. Smoke on the first pass through a material the listing forbids, such as metal on a wood-only blade, is a stop, not a technique to improve. Unplug or remove the battery before you inspect the blade.
Can I tie the guard up to see the line?
No. The lower guard is what covers the teeth when the saw is not in the cut. Tying or pinning it open leaves a spinning blade exposed if the saw kicks or if you set it down early. If you cannot see the line, use a clamped straight edge and the notch or the mark on the shoe, with the guard free to move.
Do I stand behind the saw?
Stand to the side of the blade line, with both hands on the saw and the shoe flat. Standing directly behind the saw puts you on the path if the blade pinches and the tool comes back. Keep the lead out of that same path on a corded saw.
What if the cut wanders off the pencil line?
Release the trigger and let the blade stop. Do not steer a spinning saw back onto the line. That twist is a kickback risk. Withdraw the stopped saw, unplug or remove the battery, and start again from a straight edge, or accept a second cut on the waste side if the work allows it.
Does this advice apply to a table saw?
No. A table saw or a saw bench has its own riving knife, push-stick and crown-guard rules. HSE’s 8 mm riving-knife guidance is for that machine. Using it as a setting on a handheld shoe would describe the wrong tool. If you are ripping on a bench, follow the bench manual and the HSE woodworking sheets, not this page.
When should I stop and get a joiner?
Stop when the timber is structural, when the guard sticks or a part has come off, when the motor smokes, or when the cut is metal beyond the thickness the manufacturer states. At work, a cut you are not trained and authorised to do is the same stop. A joiner is the person for a fitted stair or a load-bearing member, not a second pass with a dull blade.
Related pages
Sources
Public UK sources and the amazon.co.uk listings compared on this page. Listings captured 20 October 2026.
- HSE: Wood dust (retrieved 20 October 2026)
- HSE WIS23: Wood dust, controlling the risks (retrieved 20 October 2026)
- Control of Noise at Work Regulations 2005, regulation 4 (retrieved 20 October 2026)
- GOV.UK: Product marking, UKCA and CE (retrieved 20 October 2026)
- BSI: BS EN 62841-2-5:2014 hand-held circular saws (retrieved 20 October 2026)
- Evolution UK: R185CCSX circular saw with track (retrieved 20 October 2026)
- Which?: Dangerous items on online marketplaces (retrieved 20 October 2026)