How do you know the chain pitch of a chainsaw?
Number of links
If you use one bar and have a constant pitch the number of links in the chain should also be strictly observed in the selection. If you mistake this parameter, the chain simply can not be put on, it will either hang out or be too small. The number of links is usually marked on the box by the manufacturer. You can always verify this parameter by telephone, if you can’t see the product in person.
To find out how many links are in a chain of a particular chainsaw you need to take it off and align it on the surface.
The number of links is counted by the drive links, that is, the shanks that engage the sprocket and protrude on the inside of the web. You don’t have to count all the links.
To avoid confusion and to make the task easier, a mark on the first counted shank is made with a marker. Once you get to it, don’t forget that you don’t have to count it anymore. The number of elements can vary from 40 to 84. The most popular models have a blade length of 52 to 64 links.
Plate connection types
In classical chains, the side plates are connected by bushings. bushing). They are essentially hollow shafts that are rigidly connected to the side plates. These chains are more suitable for single-speed bicycles and bicycles with planetary hubs.к. this connection is more rigid and makes it more difficult for the chain to bend sideways.
Most speed chains use a sleeveless connection. Each plate has a notch where the pin fits. This provides more bend in the horizontal plane. The illustration below shows two types of connection in sectional view.
It is very difficult to find a bushing chain on the market these days, t.к. sleeveless connections are less expensive to produce.
Features of lightweight chains
Hollow pins and peorized plates are used to make it easier. The stretch factor of these chains is generally higher, but very much depends on the quality of the particular chain model. Lightweight chains are only inferior to conventional chains in terms of strength when subjected to shock loads.
chains with one repetitive link
Such chains are called Half-link chains. half, link). In technical literature these links are called transitional or curved links. Whereas in classic chains two half-links can be distinguished, in this type of chain all links look the same.
These chains are more susceptible to stretching, and it is clear that variable tooth width sprockets (Narrow Wide) cannot be used with them. But they are very well suited to single-speed bikes without tensioners t.к. Allow more precise adjustment of chain length.
It cannot be said with certainty that corrosion prevention increases chain life. The oil itself is sufficiently protective against corrosion. Timely maintenance and care of your chain is the key to longevity.
People pay attention to the coating for those who know that the chain will work in particularly harsh conditions: dirt, water, etc.д. But it is impossible to visually evaluate the quality of the surface finish. The chain can be chromed on the outside, but the chain can have unprotected load cells on the inside.
Using a specific chain model will give you more information than its specifications or appearance.
How to choose chain pitch on a chainsaw
There are several criteria in selecting a chainsaw. One of them is a chainsaw chain pitch. This parameter defines the ability of the equipment to cut materials quickly and must match the engine power, only then will the life of the tool be prolonged and the specific fuel and lubricant consumption be reduced.
How to Buy Correct Chainsaw Chain Replacement (Chain/Bar Numbers Explained) The Repair Specialist
How to choose chain pitch on a chainsaw.
How to use the table?
The left column shows the most common chainsaw models, the following ones. the leading criteria. After having found the necessary modification of the tool, it is possible to learn the necessary data about its sawing part and quickly solve any disputable situation.
The chainsaw chain has an important function in the chain saw. It is the one that determines the performance and cutting speed to a large extent.
Choosing the right chainsaw set for a low-powered chainsaw can significantly increase its performance. In this article we will consider types of chains and their main parameters.
Chainsaw power depending on chain pitch
It has already been said that the higher the pitch of the chain, the more power the chainsaw has to offer. What exactly are these numbers?? Let’s have a look at.
Observing these parameters will allow the saw to maintain the necessary chain rotation speed, as a result of which the motor will not feel overloaded and therefore will not get hot. This also avoids wasting fuel and becoming blocked in wood.
If you put a chain with a small pitch on a chain saw that is too powerful, it will result in unjustifiably high gasoline consumption. But if you do not have a less powerful machine and need more sawing precision, there is no harm in using a chain with a smaller pitch.
However, the above power characteristics are suitable if the chainsaw is not intended to be used permanently, but only occasionally. For regular professional use, however, these conditions will already have to be met:
The 3/8P pitch is not specified because it is not used for professional applications.
Keeping these ratios in check allows your chain saw to last as long as possible.
How the pitch varies with the additional features of the saw chain
Performance comparison table for electric chainsaws.
During the movement of the chain and the cutting of the wood, the chain is under very high stress, therefore, the thickness of the link element that enters the groove of the bar and slides in it is an important characteristic. This value also indicates the thickness of the link bindings. It can be measured with a normal caliper.
Typical guide element thickness values:
Thickness 1.1 и 1.3 mm are used for entry-level chains designed for light-duty applications. Most common stepping distances for these values are 0.325″, which implies a gentle mode of operation and low loads.
Size 1.5 mm is the most common on the chainsaw and accessory market, this value is sufficient to ensure safe operation at a 3/8″ pitch. However, this value will always indicate that the chain is not intended for professional use.
Guides that have a thickness of 1.6 и 2.0″, designed for the most demanding applications, i.e., shift work. You should know that these two values are a certain qualifier indicating that the metal for these chains is melted from special steel grades, i.e., an increased strength is incorporated into the construction.
All manufactured chains may vary in depth of cut. It is characterized by the height of the cutting tooth (profile). The height is measured between the top flank of the cutting edge and the limiter (all on the same segment). There are low profile and high profile chain products.
Chain pitch (a/2) and shank thickness (b).
The higher the profile, the higher the entry into the wood and therefore the cutting speed. The height of the profile influences the vibrations that may cause increased wear of the drive or problems holding the tool in your hand, the higher the cutting part, the stronger the vibrations will be. Also a high profile chain requires more engine power.
Household chainsaws always have a low profile chain. Professional devices combine different variations, but it is always adhered to that if the chain has a large pitch, its profile is low, and if the pitch is 0.325 profile make high.
Such variations make it possible to increase the cutting speed not by the pitch but by the profile height (kerf depth). nevertheless, most professional felling tools make an accent on increasing the pitch rather than profile height, arguing that the chainsaw is more controllable in this variant.
Order of cutting links
In most cases, the order in which the cutting elements are arranged can be of three kinds.
- With a skip. After each cutting tooth a connecting link is inserted.
- Half-pitch. A connecting link is inserted between each pair of cutting links.
- Standard. Each cutting tooth is secured by two connecting links.
The cutting links are the core elements of the saw chain and are very expensive due to the complex production process. Manufacturers, by changing the order of the cutting teeth, reduce their number and thus reduce the cost of the finished product. But because of missing links the efficiency of the tool is noticeably reduced and the chain wears out faster.
Which chainsaw chain to buy by type of cutting links
This option is mainly important for those who work with professional models of tools. There are two basic types of cutting link:
- The chipper. The shape of the profile resembles a seven. The working surface is straight and fits evenly into the area to be treated. The main disadvantage. it is difficult to sharpen and sensitive to dirt.
- Chipper. Also called a chipper. The shape of the profile resembles a sickle, which increases the contact area and increases the load on the user. As a result, the cutting performance falls somewhat. On the other hand, the chipper is not afraid of dirt and is relatively easy to sharpen.
the chisel profile is considered more efficient, while the chipper profile is easier to work. Many users work with both types of saw chains, simply changing them if necessary.
Chainsaw chain chart
Chains, and therefore tires, have three basic characteristics:1. Length (for chain, number of links);2. pitch (1/4, 0.325, 3/8.404);3. Thickness of shank (for chain)/width of groove (for bar).
Chain pitch. Table
Depending on the pitch, chains are now available in several subtypes:
|№||Rivet spacing||Chain pitch (width in inches)|
Technical Tips- Identifying Chain Pitch and Chain Gauge
As can be seen in the table, the pitch of the chain is given as a usual number (3/4) and as a decimal number “0.375. This division was caused by the similarity of the decimal values, “0.325” and “0.375,” because the difference of one digit created confusion when selecting the saw. Therefore, at one time it was decided to establish two different designations: decimal and regular fractions.
The pitch is stamped in the area of the throat stop on each tooth.
The advantages of a chain with a larger pitch can be attributed to:
But please note that a wide kerf requires a more powerful motor, which in turn greatly increases the resistance.
The advantages of chains with a small pitch are:
Benefits are achieved by the large number of teeth and the small spacing between them.
All of the known chain classifications are based on the features of their markings depending on the pitch, which are designed for specific needs and made for a specific power of the electrical equipment. For a better understanding of each type of pitch, they should be considered separately.
The higher the profile height, the greater the material entry (depth) and the higher the cutting speed
The thickness of chain is the thickness of the drive link (you can measure it with a caliper). This dimension must always be the same as the thickness of the groove of the guide bar.
How To Buy The Proper Chain For A Chainsaw
For electric and gasoline-powered saws and harvesters, there are a total of 6 dimensions that determine the thickness of the drive link:
- Chain with a step of 0,25 aka 1/4. Distance between three rivets (drive links) 12.7 mm ÷ 2 = 6.35 mm converted to inches (÷ 25.4) in inches is 0.25 (often referred to as 1/4).
- Chain in 0.325 pitch. The distance between the three rivets (drive links) 16.5 mm ÷ 2 = 8.25 mm converted to inches (÷ 25.4) in inches is 0.325.
- 0.375 pitch chain, aka 3/8. Translate three rivets 19 mm ÷ 2 = 9.5 mm into inches (÷ 25.4), or 0.375 in inches (3/8 is more common, not to be confused with 0.325).
- 0.404 pitch chain. Spacing between three rivets 20.5 mm ÷ 2 = 10.25 mm converted to inches (÷ 25.4) in inches is 0.404.
- Chain with a pitch of 3 / 4. The distance between the three rivets 38.1 mm ÷ 2 = 19.05 mm converted to inches (÷ 25.4) in inches is 0.75 (designated as 3/4).