Every good carpenter and hobby woodworker needs a durable, safe circular saw in their tool collection.  The awesome versatility of the circular saw allows it to do an amazing diversity of tasks, turning it into among the most favored tools in most wood working shops.  The capacity to adjust the depth and angle of your cut makes all types of things possible. 
 
There are 2 different designsof circular saws available today: in-line circular saws and worm-drive circular saws.  The biggest difference between them is the location of the motor, which also greatly affects the amount of torque provided.  With a worm-drive saw, the motor is mounted parallel to the blade.  This style permits the motor to send a large amount of power to the blade, enabling it to cut through all types of materials, from wood to concrete.  Generally, most pro craftsmen use worm-drive saws simply because of the extra power and overall flexibility.  However, the additional power and torque also makes them much more dangerous than in-line saws.  Due to this, I believe that worm-drive saws really should only be used by pro's.  Check out a lot more information on this here: 
[http://circular-saw-reviews.info/latest-reviews/ my sources]

For standard hobby work, an in-line (or sidewinder) saw is an excellent option.  Besides producing less power than a worm-drive saw, most in-line saws should have no trouble with virtually any job you can throw at it, other than large industrial construction.  Moreover, they're just safer, lighter and generally easier to use.  Make sure the circular saw you get offers an electronic brake.  This feature will cause the flow of electricity to be reversed when you let go of the trigger, forcing the blade to stop quickly.  This is an important and helpful safety feature. 

If mobility is essential to you, you may want to consider a cordless circular saw.  These allow you to use the saw almost anywhere, without the need for bulky extension cords and a generator.  You will find a couple of disadvantages to cordless circular saws: they have less torque, and you will be constrained by the runtime of the battery .  You'll be able to purchase more battery packs to prolong your work time, however you will need to remember to check that they they're charged up, which may be an inconvenience.

Always consider the type of work you will be carrying out before buying any type of power tool.  This is particularly true with circular saws.  If you need to switch blades fairly regularly, buying a saw with a quick-change option will save you tons of time in the future.  If you require deep cuts, you will need a saw with a blade depth high enough to meet your expectations.  Also, remember to look at some circular saw reviews prior to making your purchase to make certain you purchase the best circular saw around.

Just like I mentioned at the beginning, every craftsmen and hobby woodworker needs a durable, safe circular saw in their tool collection.  The astonishing usefulness of the circular saw permits it to perform an enormous diversity of tasks, making it amongst the most widely used tools around most wood working shops.  The capacity to change the depth and angle of your cut opens up the door to many possibilities.
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