Rip-cutting circular saw blades are manufactured to cut with the grain of the wood. The blade characteristically has a wide gullet, aggressively positive angle hook, fewer teeth than any other saw blade type. The main purpose of such design is to rapidly rip the wood without grinding it, and easily get rid of waste such as sawdust or chipped lumber.
Circular saw blades designed for this type of cutting vary greatly from saw blades designed for crosscutting. Most of those differences come from the fact that it is easier to rip than crosscut, meaning that each tooth of the blade can remove a larger amount of material. The best type of saw for ripping is a table saw. The blade rotation and table saw fence help to control the wood being cut; allowing for very accurate and fast rip cuts.
Radial arm saws are not as good for ripping, as the blade rotation tends to lift the wood off of the table, creating the potential for an unsafe situation and damaging the wood on the sides of the kerf. If one were to attempt to cut with the direction of the blade rotation, the blade could grab the wood, lifting and propelling it forward as a missile. Wood that is grabbed in this manner can easily go through the wall of a workshop.
A rake angle of 20 degrees is not uncommon. Positively angled rake, next to large gulletsare set in order to increase the feed rate.
Side clearance angles are adjusted to get rid of large amounts of wood. Blade teeth are often flat-top ground FTG as splintering and splitting is not much of an issue. Simple FTG shape offers good durability and efficiency, as these characteristics are prerequisites of a successful saw blade.
The small flat chisels on a rip saw blade that slice parallel to the grains easily become blunt, since the actual surface of the wood they cut is absolutely non-comparable to the crosscut saw blades. Some rip cutting blades alternate the standard FTG teeth with a modified tooth, which has the corners knocked off at a 45 degree angle. TCG blades are designed for longer life, as the tooth without the corners can cut the center part of the kerf, allowing the teeth with the squared corners to clean out the corners of the kerf.
For this application even combination saw blades with ATB designbut lower teeth number, can be a good purchasing option. The number of the teeth can be even higher, depending on the saw blade diameter and tooth design.
The tooth count for TCG shape is around 30, 40 to The gullet is considerably larger, in order to accommodate the larger quantity of chips and sawdust that accompany faster cutting. Rip cutting blade plates are made from stainless steel or high speed tool steel HSS ; a ferrous metal with alloys of chrome-vanadium or cobalt.
They are typically carbide tooth blades, for high durability and longer life expectancy between sharpening. Tungsten carbide tipped blades are considered as premium quality saw blades. Due to the low tooth count, ripping blades do not provide for a smoothly finished cut, regardless of the material being cut. It is necessary to finish off the cut with a plane or electric sander, if sanding is required for further treatment.
For this same reason, they are not good for crosscutting. When used for crosscutting, the low tooth count and high rake angle will make the blade try to pull through the wood too quickly, causing damage and poorly finished, rough cuts. The usual carpentry jobs include cutting moldings, which generally must be done very precisely, according to the length and thickness.
Rip cuts should be done with thin-kerf blades in this case to define dimensions properly. Watch out for this label when buying a circular saw blade. The biggest problem you can expect is a nail in a plank, which can seriously damage the blade plate and prevent its further use for demanding jobs.
Circular saw will more likely hook it when ripping that cross-cutting. A nail could not only crack the saw blade plate, but damage the circular saw while revolving or seriously injure a worker. Woodworking with electrically-powered machines like circular saws requires caution and wearing carpentry safety equipment for your own good. Vibration and flexing is a major issue with these blades, as the blade will naturally try and follow the path of least resistance.
This can cause a blade to try and wander to one side, following the grain.There are saws with the blade on the left, and saws with the blade on the right. So they rotate clockwise if the blade is on the left and counterclockwise on the right. If the blade is on the left you put the blade on so the writing is hidden. I don't think there are any saws that will let you switch directions. Occasionally, I turn the blade around backwards to cut something like vinyl siding.
Since there isn't a front or a back to a circular saw in the plane of the blade, terms like "clockwise" or "counterclockwise" are relative and not crystal clear.
A circular saw rotates so that the teeth at the front doing the cutting vs. If you reversed the motor, you would be pushing the workpiece away from the sole plate. Or more likely you would be pushing or launching the saw away from the workpiece When looking at the blade side of a circular saw the blade turns counter clock-wise. When looking at the blade side the teeth on the leading edge of the saw should be pointing up. You can reverse the blade only do this with a fine tooth blade to cut very thin wood, plastic or metal.
Circular Saw Blade Rotation Direction
If you do this be very, very careful and make sure you are using eye protection. The direction the saw rotates is not reversible, but fine-toothed blades can be reversed to get a smoother cut on lighter panelings or vinyl siding, etc. Check with your local lumber yard or home improvement store for what works best. Clockwise, and no, you can't switch'em!You're using the wrong table saw blade for joinery!
Why in the world would you want to? I mean, all the blades are set to cut in one direction, they're not reversible.
In other words the blade cuts towards you as it pulls the wood not pushes it. The blade teeth point away from you as you are cutting. Not sure why you would want to reverse the motor direction as the blades will only cut in one direction unless you install the blade backwards. I have seen this done to cut thin metal but it is not a good idea. Better to get the proper blade. If you've got a problem with putting on new blades, just stand in front of the machine and make sure the teeth are facing you when installing it.
The saw spins the way it spins for a reason, it draws the wood to the saw if you reverse it you would have to fight to hold the saw down. Trending News. Photos: The life of John Lewis. CDC singles out 3 critical coronavirus symptoms. WH moves Bush, Clinton portraits to disused room.
Ex-'Ellen' staffers: Show has 'toxic work environment'. Lunch outing ended up infecting NFL star's family. Fox News host fact-checks Trump during interview. Fox News host praised for correcting Trump over tweet. NBA star looks dramatically slimmer at Disney World.
White House doc shows 18 states in virus 'red zone'. Marty R.If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you. Log in or Sign up.
DIYnot Forums. OK, it's a stupid question, but all I know is that I know nothing I have owned a cheap Bosch model before. I thought these blades always rotated such that they cut downwards, i. I'm sure my previous model did. HBoy31 Mar All the ones i have ever used have cut towards the baseplate on the leading edge of the blade So just as that Bosch is setup. Hitachimad31 Mar ColJack31 Mar OK, I see. It's all to do with preventing kick-back.
Thanks guys. When it arrives, the first thing I'll make is a 'stupid chair' which I will sit on for the rest of the day Thanks for your help.
Regards HBoy. HBoy1 Apr Thats why you will be advised to cut anything with a circ saw to have the good face on the bottom, that way any breakout will be on the back face Jason. Jasonb1 Apr Joined: 3 Sep Country:. Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue You must log in or sign up to reply here. Show Ignored Content.Circular saws are an indispensable part of any workshop because of their versatility. With different blade types and sizes, they are guaranteed to cut through almost any type of material with minimal effort. They are also quite portable and can be carried around to where they are needed, especially given the cordless battery-powered versions. In each saw, the blade is the major determiner to the material it can be used on, be it wood, stone, plastic, ceramic and more.
Blades are designed with specific applications in mind so that choosing the right blade for every job is of paramount importance. That means the blade should cut upwards at the front. This definition applies to woodworking blades because they are the ones that feature prominent teeth. Almost all circular saw blade would have arrow marked which would tell you the direction the blade should rotate. However, even for these types of blades; you will find different configurations available.
Others are cross-cut and combination saw blades, but despite the different teeth configurations; they all face backwards. Therefore, the blade of a circular saw should be fixed so that its teeth face the direction of spin. Metal cutting blades are toothless, however, they only feature expansion slots for when the blade heats up. A fuller glossary on circular saw blades is available on this Rockler page.
Circular saws rotate by default in a counter-clockwise direction. The teeth of a circular blade are designed to cut on the upstroke in the forward direction. This pushes the material forward and towards the blade so that it helps maintain control of the saw and the workpiece.
This would result in the saw being kicked up as soon as the teeth made contact. With a still spinning saw in hand, you can imagine the possible outcome in such a situation. With the upward spin direction the teeth would be biting more firmly into the work-piece and thereby preventing any mishap.
This is an important safety consideration and also keeps the area of cut clean and more accessible for faster and easier cutting. If your circular saw is spinning backwards, you are in a very dangerous situation and should not proceed until you have figured out what the problem is. The most common cause of such an issue is an electrical fault. Below is a step by step guide to help you solve this problem. There are always arrows marked prominently on the blade disk itself that will guide you.
The blade should be fixed in the direction of spin of the motor, which is counter-clockwise at the front. Table fans should spin in a clockwise direction. If it starts spinning in the opposite then it could mean that your power source is faulty.
Circular saw blades are interchangeable and this is what makes the saws so versatile. Different blades work for different materials.There are blades with many teeth and blades with fewer teeth, blades with no teeth like continuous rim, blades with wide kerfs and thin kerfs, with negative rake angles and positive rake angles, and then blades that claim to be all-purpose, which can really be confusing.
Generally, blades with more teeth will provide a smoother, finer cut whereas blades with fewer teeth will provide a rougher cut. The benefit of fewer teeth is faster cutting and a lower price.
That blade is very aggressive and will help you rip and cross-cut lumber and sheet goods quickly and with a high degree of accuracy. Keep that in mind as you shop. A more refined thin kerf finishing blade will be more appropriate when cutting hardwood and trim in scenarios where you want a much cleaner edge.
In general, the higher the tooth count per blade diameter the smoother the cut will be. It also means, however, that the saw will need to exert more force, and the cut will be slower on average. The gullet is the space between the teeth, the size and depth of which determine how much waste material is cleared out as the blade spins.
You can quickly see that the gullet size is a function of the number of teeth. There are applications — like metal cutting — where a positive hook can be very dangerous. You can find metal cutting blades and specialty wood blades that use a negative rake angle.
The higher the bevel angle, the cleaner and smoother the cut. This is the width of the tooth at its widest point and therefore the width of the cut.
At first, you might guess that thinner kerf was designed for finer woodworking, but it was originally developed for less powerful job site or portable saws. We reviewed extra-fine, thin kerf inch miter saw blades and found that there is a lot to be said about the various tooth geometries and vibration reduction technologies used in these blades.
The thinner kerf produced less resistance in the cut and so was better-suited for the power needs of those saws. The trade-off, however, was that thinner blades vibrated or wobbled and resulted in cuts that revealed that blade movement. These blades had particular trouble in hardwood cuts.
New blade technology with vibration reduction design has made some improvements in the thin-kerf blade segment cordless circular saw users rejoice! Most importantly, determine what general type of cut will you make — crosscut across the grain or rip cut along the grain. What kind of cut do you need — rough or smooth finish?Diamond blades get beat up in a variety of ways.
They get burned, stuck and then hit with a hammerbent and broken. It's not pretty and it's not good practice. Whether you're using a diamond blade on a gas-powered saw, electric hand saw or walk-behind saw, a few words of wisdom can help save blades from misuse and abuse.
Factors affecting longevity Blade life can vary greatly depending on a number of variables. One key factor is blade quality diamond quality and concentration, and segment bond and width.
Consider that two blades of the same diameter could have different diamond depths, amounts of diamond in the blade segment and segment heights. As with traditional diamonds, there are different grades assigned to synthetic diamonds for saw blades.
Which way should the teeth be facing on a circular saw blade? (details)?
In some cases, it may also grind or cut faster, as well. Another key factor in blade life is the material that needs to be cut. Cutting a hard material such as concrete requires a different blade than one used to cut a soft, abrasive material such as asphalt. The harder material requires diamonds to be exposed more quickly, and a softer bond to hold the diamonds to the segment. How concrete cutting impacts blade life depends on the aggregate size, sand type sharp and abrasive or round and non-abrasiveaggregate hardness determined by rock type and reinforcing steel amount, grade and gauge.
For example, a coarser aggregate with a lot of sand will wear a blade faster than concrete with less sand and less aggregate, Skaff says. However, softer and more abrasive green concrete will require a harder bond with undercut protection, Fisher adds. How long a blade will be useful on a job depends on the amount of cutting that needs to be done. Using a blade to cut a driveway is different than using a blade to cut a long stretch of highway, Fisher points out.
The saw used with the blade also affects blade life. A tool with high rpm will wear a blade faster than a tool with low rpm, Skaff says.
The operator can shorten the life of a blade, as well. An operator applying more pressure will tend to wear out a blade faster than someone applying less pressure, Skaff says. Tips for longer life Given these variables, manufacturers offer the following dos and don'ts to maximize blade life. Do use the right blade for the job. There are blades designed specifically to cut concrete, masonry and green concrete.
While general-purpose blades can cover a variety of cutting tasks, application-specific blades are engineered with a specific bond to meet the needs of a certain application. They do the best job and will last longer, Skaff says. What type of cutting equipment will be used?Learn how to change a circular saw blade!
There are a few reasons we may need to change a circular saw blade. First, the blade may be damaged or dull. Or we may need to cut some metal, but we have a wood cutting blade installed on our circular saw. This post contains affiliate links to supplies or tools I used to complete this project.
Purchases made using these links help support the Saws on Skates website and allow me to share more DIY projects. There is no cost to you for using these links. Click here to visit my site policies. Before we get into how to change a circular saw bladebe sure to click the subscribe button at the bottom of this page to sign up for my FREE weekly newsletter loaded with helpful pocket hole tricksspace-saving workshop ideasclever DIY tips and more!
The measurement used to determine the size of a circular saw blade is the diameter. Diameter is the measurement from side to side through the center of the blade. The diameter or size of the blade we need is usually printed on our saw. We can also find the size printed on the blade in our saw. The hole in the center of the blade needs to fit on the shaft or arbor in our circular saw.
The arbor size should be printed on our saw or saw blade. We can also take our old saw blade to the big box home improvement store or hardware store to ensure our new blade will fit. The last thing we need to look at is the RPM or revolutions per minute. Typically saw blades with more teeth cut more slowly but produce cleaner cuts.
Blades with fewer teeth cut more quickly but usually produce rough, choppy cuts. In this case, we may use a 14 tooth saw blade to cut the studs. The blade will make the cuts quickly, but the edges of the cuts will be rough or choppy.