Like any other cutting tool, your saw will only work properly when it is sharp.
To lengthen the life of your saw, always keep it free of rust; when not in use, store it in a dry place covered in a coat of light machine oil (this is especially important if you use it infrequently).
Blunt saw teeth are easy to spot - they no longer drag the skin when you run your thumb along them and on close inspection they look smooth and rounded. Unless the saw is a very cheap one it will be well worth resharpening it.
3 Circular Saw
You have two alternatives. The first is to have the saw
sharpened professionally: most tool shops and DIY stores either offer this service or sub-contract to a specialist saw doctor. The second is to do it yourself, in which case you need saw sets and saw files. Such tools aren't cheap, but if you use saws a great deal they're worth it.
Usually a good saw can be sharpened several times before the set is worn away.
Topping: Start off by clamping the blade in a vice, sandwiched between two wooden battens placed as close to the edge of the teeth as possible.
Run a fine flat file down the length of the blade a couple of times, holding it absolutely
straight and steady.
Shaping: Place a triangular file in the first gullet so that it follows the pitch of the teeth. Make two full length strokes across the saw, at 90° to the blade and parallel with the ground. Repeat the process for each gullet in turn until the teeth are all consistently shaped. Note that although professionals shape by eye, DIY saw sharpeners hold the file at the correct automatically.
Setting: This is the process of bending alternate teeth outwards so that the saw blade has a kerf and cuts cleanly. DIY saw setting pliers make the job considerably easier than the traditional method.
Setting pliers can be adjusted to any setting between four and twelve points per inch (ppi), which covers most saws except tenons. The ppi should be marked on the blade of your saw, saving you having to count.
Set the pliers to the correct ppi, place them over each alternate tooth, and squeeze. But make sure you follow the direction in which the teeth are already bent or they will almost certainly break off.
Afterwards, turn the saw blade round and set the intervening teeth in the same way.
Sharpening: Filing the teeth of a saw by hand with a plain file is a skilled job - it takes a lot of practice to maintain the proper cutting angles.
Fortunately, DIY saw sharpeners do most of this for you. But be sure to read the maker's instructions carefully - in particular, the angle setting on DIY sharpeners is different for different types of saw.
File only on the push stroke and be careful not to remove more metal than you have to. Finish off by lightly rubbing the sides of the teeth with machine oil to remove any burrs.
Sony Network Media Player Metcal Soldering Station Aoyue Soldering Station