Yes.You should read all safety warning on your trimmer and be very careful to wear appropriate clothing and safety gear when operating any power equipment.
To sharpen hedge trimmer blades, you can use a grinder to grind down the edges. You can also purchase sharpening tools.
No how often they will need sharpened will depend on how much you use them and what on.
There made of Adamantium.
The Weed Eater Electric Trimmer is one of the easiest to use
A cordless string trimmer is used to keep the edge of your lawn neat. You can also use a gas powered trimmer..
Yes. I have replaced a lot of old leaky cast iron sewer pipe and always use a sawzall. I use regular metal cutting blades. If you don't have the specific blade handy use bimetal cutting blades.
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Plug it in.
I use 30w engine oil with my trimmer. Once I start it and let it run a miniute (You can do this with an electric as well) I use an old oil can to apply about 1-2 drops of oil where the guide bar screws are located. I reapply about every 2-3 hours dependant upon how heavy I am using the machine. With an electric I would think you shouldn't be using it as much, but I may be wrong.
a trimmer primer is a small text book thing that beginners use if you are talking about -rooster's riddles
An electric trimmer will be cheaper to operate over the course of a year.
You can use a string trimmer to clean up smaller hedges that aren't too woody, but you would get a much cleaner job with a real hedge trimmer. A string trimmer will cause shredding, instead of the clean cut of a hedge trimmer. There are several string trimmers on the market with split shafts that allow you to add additional tools. You may wish to try one that has an optional hedge trimmer attachment.