Step 2 Take out a fence-building permit (if required in your community) and make sure you put the fence on your property. If you are in doubt, the country zoning board will determine your property lines (for a fee). Pay close attention to height restrictions when building your fence.
Step 3 Dig the holes for your support posts to a depth of at least 30 inches for a 6-foot-high fence. The standard post distance for a wood privacy fence is 8 feet, but consult the lumberyard if you are using different fencing material.
Step 4 Set the corner posts first. This is imperative in order to make sure your fence line is even. Mix only the amount of concrete you need for one hole at a time. Shovel a couple of inches of wet concrete into the bottom of the hole and position the post. Ask an assistant to hold the post upright as you shovel concrete in around the sides. Bring the level of the concrete slightly above ground level and form a gentle slope away from the post to encourage water drainage.
Step 5 Level the post before the concrete sets. Work quickly, especially if you are setting the posts on a hot dry day. The dry ground will quickly leach the moisture from the concrete. Use a carpenter's level on all sides of the post. Allow the concrete to cure on the corner posts before setting the center posts.
Step 6 Tie a string from the outside of one post to the outside of the other post, at the top, pulling it taut. This string will serve as your guide and it will remain in place while you set the rest of the support posts. Place the center posts and make sure each post is level on all sides and that each post barely touches the guide string.
Step 7 Cut and install the fence rails. The rails go on the outside of your support posts. This will allow you to install the fence boards on the outside of the rails. Some homeowners prefer a smooth look on the inside of their fence, and they reverse the process, putting the rails on the inside of the posts. Although this makes a smooth interior look, it reduces security as the rails on the outside of the fence provide a foothold for would-be intruders.
Step 8 Install the fence boards using galvanized screws to prevent rusting. You may purchase fence board spacers, usually in 1/4- and 1/2-inch increments. Install the first fence board by the corner post and install another one next to the opposite post. Check each fence board for level and for height and then run a string line from the top of one fence board to the top of the opposite fence board. This string serves as a guide for installing the rest of the boards; they will just barely touch the string.
Step 9 Repeat with the rest of the boards, using the spacers to make sure they are evenly spaced. When you reach the final board, you may have to remove it and cut it lengthwise to fit if the space is less than the standard board width. Cut only the last board, not a center board.
Spherical Roller Bearings are most suitable option for applications that need shock resistant components yet this is not the only quality these Bearings have. These Bearings can handle heavy loads because of their rings` alignment. Due to the curved outer ring, Spherical Bearings come with self aligning capabilities that make it possible to absorb shocks and also enable the apparatus to carry high axial and radial load even in harsh environment with lot of vibration. Even with this rugged working environment, Roller Bearings tend to have high precision.
DESIGN
Spherical Bearings have two rows of rollers that are separated by a cage or rib that could be sealed or unsealed depending on the specific model and application, external raceway and dual raceways in inner ring to support rotating shaft. Amazingly the quality and alignment of raceways, cages and rings define the overall performance and quality of the product. Asymmetrical rollers increase performance and precision while symmetrical rollers offer better load distribution, lesser vibration that ultimately leads to durability.
MATERIAL
These Bearings are manufactured with several kind of material based on the application and working environment. Chrome steel is one of the most popular materials used in production of these Bearings because of its durability yet sheet steel, polyamide and brass are also used for some applications. One of the most important parts of Spherical Bearings is the cage that holds bearings at their place. That cage is usually manufactured with pressed steel or brass because both of these materials offer strength as well as temperature resistance.
These Bearings tend to have seals in order to prevent contaminants like dirt, liquid, debris as well as harsh temperature. This type of these bearing doesn`t even need lubrication if they do not exceed 50% of their maximum allowed RPM.
APPLICATIONS
Spherical Bearings are essential part of heavy machines like gearboxes, turbines, mechanical fans, constructions equipment, mining equipment and drilling equipment. Roller Bearings are available in multiple standard sizes and dimension yet they are also made with custom sizes and specifications.
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MODELS AND VARIATIONS
Usually these Bearings come in two different types that have totally different design, structure, specifications and applications.
Single Row Spherical Roller Bearings
These are also known as Barrel Bearings because of their design and they are widely used where only low radial load carrying capacity is required. Other than the load capacity difference, Single Row these Bearings is quite similar to their counterpart in terms of performance and durability.
Double Row Spherical Roller Bearings
These are used where high radial load carrying capacity if required and that make them an essential part of almost all heavy duty machinery out there. The design difference between these two is obvious; Double Row Roller Bearings come with central flanges that optimize the overall performance of the apparatus.
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