I Put Blade Depth To The Test. We’re Getting It WRONG!

Рет қаралды 79,633

Жыл бұрын

Exactly how much of your circular saw blade should stick out past the material you're cutting? I went on a journey to find the perfect answer and.. I did just that. Learn about what produces the least tear out and how safety factors in as well. #diy #circularsaw #woodworking
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Пікірлер: 76

@GoodlyEarth Жыл бұрын

This video is great. I have always set my blade depth at the minimum to get the cut done. Your video shows that is the way to go.

@jorglange2666 Жыл бұрын

The lenght of the blade in the cut will influence ability to cut straight in a free hand cut, also the center of gravity of the saw is lower to workpiece when cutting full depth. The position of the handle of saw will make a difference, on some saw the angle becomes less comfortable when raising motor away from work piece. This is an advantage of drop foot saws where angle does not change and also location of blade is same when making angled and perpendicular cuts.

@HammerNQuill Жыл бұрын

I always set to about a 1/4" - so this is a welcomed tip! Thanks for doing the extensive testing.

@thunderoutboards1140 2 ай бұрын

I've been using my saw for regular projects around the house for years. I finally realized I should replace the blade so I went to KZfaq for information and found this amazing video. Thank You!

@tarekalhajj8691 Жыл бұрын

Do you think a neighbouring cut affects a cut? It seemed like the first cut had the full solid support of a solid board, whereas after the first cut, the board had less support to the cut, possibly causing more vibration, which might mean not a fair comparison across cuts due to uneven conditions for the cuts. Maybe try the same experiment but start with a different cut first and see what you get. Or have a large separation , maybe even seperate boards... You have lots of boards to spare right? 😁

@castlesnake Жыл бұрын

Exactly what I was thinking!

@bobwanmorgan9906 Ай бұрын

I think the vibration from thin strips is a problem with the experiment

@rudreshingole365 4 ай бұрын

this video deserves a like and a comment.

@longleaf1217 Жыл бұрын

excellent video my dude! I never gave much thought to cutting depth before now but have usually always stuck to about 1/8th inch simply cause it seems like the safest way to do it. its really nice to see that it also gives the best cut. 10/10 great video!

@seanhorton3811 Жыл бұрын

Way back when taking wood shop in Jr. high, our instructor taught us the projection should be the thickness of the saw blade. As most blades were about 1/8" thick back then, it would hold true to your results.

@daRock1212 Жыл бұрын

Good to see the safest depth gives the best results. Makes sense too, the smallest exit angle would produce more shear and slicing than a blade 90 deg to the workpiece. Thanks for doing this!

@polivetree Ай бұрын

I don't know if you're timing the ads, but that Thunder Interruption happened just as the ad kicked in 😂

@sergeyd5777 11 ай бұрын

At 3:45 mark you introduce the only thing that is important: the cutting angle. At 1/8", it is minimal, while at full depth it is the closest to being perpendicular to the board. Now decide for yourself if you want the saw blade teeth to attack your board almost tangentially (probably not good for the far end of the piece you cut), or you want them to fly across the board (bad expectation for plywood, as you can imagine).

@yourmasterrenovator86 8 ай бұрын

Very well done 👍 Thanks heaps for your thorough demonstration and the time and effort that you put into this 🙏

@DiHandley Жыл бұрын

Thanks. I’ve always wondered about that. And now I know! 👍

@dakkon123 Жыл бұрын

What order did you make your cuts? Those resulting wooden fingers are unsupported. That could allow part of each subsequent cut to flex and could partly account for some of the differences.

@LRN2DIY Жыл бұрын

That’s a great point. I filmed all of the cuts so I just double checked and I cut all of them from shallowest to deepest so it’s probably worth trying some new tests in the opposite order as well as making the cuts further apart (no fingers) or supported just to test that out. Great point that I should have caught! I don’t suspect it will have much of an impact on the outcome but I could absolutely be wrong about that. Thanks for the insight.

@Trotsetukker Жыл бұрын

You can see that the MDF is flapping around. Sorry LRN2DIY, I gave the video a thumbs down directly when I saw this.

@tomasrosalesr Жыл бұрын

I was thinking the same

@Paul_Halicki Жыл бұрын

One thing I thought you would be testing is how much force/effort it would take to push a blade through the board; how easy is to to cut at various depths.

@jeffostroff Жыл бұрын

Nils Great minds think alike. The rule of thumb I have always used is half the distance of the tooth which is typically about an eighth of an inch or so. On my table saw I will sight the blades so that it just barely sticks up above the wood by half of a tooth.

@LRN2DIY Жыл бұрын

Makes perfect sense, Jeff. I suspect if I did the same tests on a table saw the results would be about the same too. The half tooth makes sense and I have a very healthy fear of table saw injuries so I keep that blade as low as I can get away with.

@BigBopper1966 11 ай бұрын

I was taught in my Wood Technics course in trade school that just past the bottom (or about 1/8") is best. The reasons given is that puts the most teeth in the cut and for safety.

@mrcryptozoic817 Жыл бұрын

The other problem with "F" is the saw has to be held 𝒑𝒆𝒓𝒇𝒆𝒄𝒕𝒍𝒚 straight and true inline with the intended cut direction. The less deep you cut, the less a wobble in your grip will effect the outcome.

@LRN2DIY Жыл бұрын

Agreed. That shallow blade makes it easier to stay on track since more of the teeth are engaged at all times, helping to keep your path true.

@pop-popmoose5359 5 ай бұрын

Like your last video I saw, I find your videos extremely informative! Thank You!

@marvellstarks2434 6 ай бұрын

Thank you Sir

@ps7518 8 ай бұрын

thank you

@garyfrechette8689 Жыл бұрын

I was taught that the full depth cut was a recipe for kickback. I actually experienced that first hand. Nasty accident.

@josephoberlander Жыл бұрын

This is why you need special guards and tools when going full depth. It is only recommended on a heavy table saw as it's absurdly prone to accidents and the mass of the table is all that's keeping it together. Even when using a table saw in a wood shop, we set it to barely poking out above the surface unless the material required it. Some things simply don't cut well except very slotly at nearly 90 degrees. Yes, kickback is a real factor if it happens and it rarely ends well. Seeing a piece of wood shoot 20 ft across the shop brings home safety real quick.

@dahutful Жыл бұрын

That's always been my go to depth...the minimum protrusion that still gives you a clean cut. You'd think this would be fairly obvious; I mean that's how I arrived at it. But logical, and what people talk themselves into are rarely the same things. Good test. Thanks

@sociopathmercenary Жыл бұрын

I think a lot of people use a bigger depth than they need when they're working on a project where they're cutting multiple thicknesses of wood. Being lazy so that they don't have to keep resetting the depth. I've been guilty of this myself but this is definitely been an eye-opener.

@antibureaucrat 3 ай бұрын

In your previous video you showed methods for getting good quality (lowest tearout) cuts, but it doesn't seem like you used that here. It was also be nice to see this done on a table saw where your hand movements would have less effect on lateral blade movement.

@alexburke5289 Жыл бұрын

Consistency is the was to get the cleanest cut and using the right tool or method. If tearout don't matter I freehand, if consistent size matter I would use a guild. If you need to limit tearout use a new 40 tooth. Fewer teeth makes faster cuts and better on harder materials. I tend to use 3 saw teeth sizes: 24 and 40 for 7 1/4 saws while 40 to 60 on 10inch blades. If you need perfection use a router.

@jonathonlyles3349 Жыл бұрын

I found the cleaner cuts come from about a quarter of a inch but that might differ between rpm of the saw mine cuts at 3500 rpm I think it's the cheap brushed Milwaukee

@JorgenVonStein 10 ай бұрын

Try to angle the teeth at 30-45 degrees to the top surface of the material, a 90 degree tooth that is perpendicular to the surface of the wood has the most surface area to slam into/ tear up through the fibres rather than cut them.

@PozerKiller 9 ай бұрын

Quick question. I know the blade should stick just a bit out of cutting material. What if I've got stair treads with nosing . Obviously the nosing drops down twice of size of the tread. How to set the blade depth when you've got 2 different sizes in one piece of wood?

@ScytheNoire Жыл бұрын

Who thought full depth was a good idea? I learned in grade school wood working class you only expose as much of the blade through as needed to cut the wood and ensure sawdust is expelled. One issue that wasn't touched on with the full blade is that it can also lead to a blade getting stuck in seizing in a cut if doing some cuts that aren't flat.

@josephoberlander Жыл бұрын

followed immediately afterwards by either the breeaker tripping or the piece getting shot 30 ft acroos the shop.

@crustydownunder 11 ай бұрын

Full depth on the blade should help with a straighter cut, due to the diameter of the blade acting as a straight edge. Plus, full depth lowers the centre of gravity of the saw, and makes the position of the handle more comfortable.

@jacobeaston7807 Жыл бұрын

I was told when I was a child, plunge the blade just deep enough to show the entire tooth. Has always worked for me, cuts start getting ugly, replace the blade. More teeth, slower the cut, but better looking, looks don't matter, speed preferred, low teeth count. All pretty simple.

@rosi6144 Жыл бұрын

Nice video. I"m a beginner and i have a question: Is it useful or overkill to have 2 circular saws, one with a special blade for ripping and one with a special blade for crosscutting, because i don't like swapping blades, making the circular saw screw dull. I also have no table saw and i don't think i wil have one soon, because they are expensive. Hope to hear from you soon. Many thanks in advance

@ST-0311 5 ай бұрын

Two saws are good, but not just for ripping and cross cutting. If your saws are 7 1/4-in get a 24 tooth blade for ripping and cross cutting lumber. The second should be for plywood, and a 40 or 60 tooth blade is recommended.

@garypic4083 Жыл бұрын

I always go as deep as I can

@RYwoodview Жыл бұрын

BTW, you are apparently using the same former kitchen cabinets in your shop that I have!

@willmallory9085 Жыл бұрын

Excellent video Brother

@LRN2DIY Жыл бұрын

Thanks, Will. Have a good weekend, my friend!

@willmallory9085 Жыл бұрын

@@LRN2DIY you too.

@willmallory9085 Жыл бұрын

@@LRN2DIY please make a video about sharpening lawn blades.

@virtualfather Жыл бұрын

I thought i saw you on a different channel about 3D printing What is that channel? Thanks

@LRN2DIY Жыл бұрын

Hi there. I have another channel called The 3D Printing Zone. I have two other hosts that help to run that one too.

@mtasubwaymartasubway 3 ай бұрын

Okay at 1:57, what ever floats your boat 😮🤔

@corycassell833 Жыл бұрын

Should redo this using straight edge doing the cuts to avoid the tail kick you spoke of at the end.

@LRN2DIY Жыл бұрын

I'm not 100% sure if I follow what you're saying but every cut but one (the first one) was made with a straight edge, if that's what you mean. It felt much more consistent that way.

@sandworm Жыл бұрын

I noticed that all your cuts were on the same board. Could the vibration of the narrow wood contribute to more vibration in the board and thus messier cuts?

@LRN2DIY Жыл бұрын

Someone else had mentioned that and I wonder the same thing. I'll try some additional cuts where they're way spaced out and see if there's any difference. I can then post the results in a pinned comment here.

@LockRocker 2 ай бұрын

Team 3/16" wants a have at it!

@nelsonglass6 Жыл бұрын

The rule I follow is a safety concern… if you only cut minimal depth will limited one cut into one person

@cameronnebe 3 ай бұрын

Cutting at a shallower depth causes less tear out because the teeth are slicing the grain at a lower angle.

@seanrrichards Жыл бұрын

Nice!!! Those cuts are still 100% better than by $24 jigsaw with a rough blade. Whew those are ugly!!!

@LRN2DIY Жыл бұрын

For sure. Jig saws are amazing for those curvy moving lines but not so great for clean, straight cuts.

@phillippearce9680 Жыл бұрын

👍

@LeonBonetti Жыл бұрын

Hello there! I stumbled upon your video and I just had to reach out because I genuinely believe I can be of assistance with your video editing. I have to admit, your content is absolutely impressive, and I'm overflowing with enthusiasm to contribute that extra touch that will truly make it shine! If you're open to exploring how I can enhance your videos, please let me know the best way to reach you. I'm genuinely excited to offer my help with your content in any way I can.

@LRN2DIY Жыл бұрын

Thanks for reaching out but I actually just hired a new editor who should be starting on my next video. I'll let you know if that doesn't work out!

@frankgreen7988 5 ай бұрын

It will put more strain on the blade if you put it all the way down through everything

@chrismo1012 4 ай бұрын

1/8 inch...just saved you time

@adaycj Жыл бұрын

Im the boss of no one. I can't agree with your safety assessment. The saw cuts and you lose parts no matter the depth. Plus there are other places othet than underneath to get into the blade. I find that a deeper depth helps me stay straight all the way down long cuts because a longer section of the blade is engaged; safer and a better cut. I also feel "kickback" of the saw and material is reduced because the contact areas of the blade with the material are more vertical, especially at the initial front cutting zone. There are also many times where blade depth is dictated by more than the ultimate cut quality. The thickness of the material, stuff that hits the motor like sleds and clamp down fences. I do this it was a good and worthwhile video, rhanks.

@kraftzion 3 ай бұрын

With the saw at full depth the force is almost directly against the shoe. With the saw at the shallowest depth that will cut through the material the force wants to throw the material forwards(kicking the saw backwards) Long winded way to say I reject your hypothesis that full depth is the most dangerous.

@Ron_Masterjohn Жыл бұрын

Less depth the blade is the less resistance so saw will spin faster and have its greatest torque.

@LRN2DIY Жыл бұрын

Hmmm. That would be an interesting one to test. On blades with carbide teeth (like all the ones in this video minus the 140 tooth blades) the tooth is wider than the blade so once it makes the cut with the tooth, the blade can pass freely. That said, the angle of the blade changes the amount of time each tooth spends actually making the cut so there could be something to that.

@MattFavet-nm2cd Жыл бұрын

But is it really the safest? When you reduce the depth you charge the angle of the handle which may make your grip and control of the saw weaker and more dangerous. You have to look at the whole picture not just one thing.

@LRN2DIY Жыл бұрын

I can see how, if you’re free handing it with no guide maybe just to roughly cut a piece off, having less exposed blade means you’re more of the blade is outside the material and it could feel different or less anchored in the material, but if you’re holding the saw with two hands like you should be, I just didn’t really notice a difference between the shallower and deeper cuts in terms of control. I did use a guide for each cut though. Maybe this is grey area but I’d rather risk the potential of a small amount of added instability of a shallow cut than have too much of the blade exposed and deal with the risks that introduces. Either way though, I see your point and it’s worth considering for sure.

@adaycj Жыл бұрын

I agree, and the teeth entering and exiting more up and down should be safer. Neither way really matters if proper technique is used.