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To sharpen hedge trimmer blades, you can use a grinder to grind down the edges. You can also purchase sharpening tools.
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.
No how often they will need sharpened will depend on how much you use them and what on.
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Some of the benefits of using a cordless hedge trimmer is that those who use it no longer have to use extension cords when trimming a huge lawn with very tall hedges.
The best I've found is black & Decker cordless. They are not very expensive ( under $40 ) and are easy to use. Easy to clean and very smooth.
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.
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.
If you have a stationary back ground ie house window or anything level, use that for a reference. If not, and the ground beside the hedges is level, pay attention to how and where you are holding the hedge trimmer. Keep your arms/back in the same position all the way down the hedges. Compare where the hedge trimmer is to your body...is it knee level?, at your waist?, neck. Where ever it is, keep it there. These things only work if you are on level ground.
Yes, more than one person can use the same nose trimmer. You can keep it clean and sanitary by using alcoholic based cleaning detergent.
I have been sharpening my electric hedge trimmer for the 32 years I've owned it. It sees a lot of use trimming many shrubs and a 125 foot long privet hedge.Use a die grinder or a Dremel-type rotary tool with a small diameter grinding wheel. I use a 1/4" wheel.Move the motor shaft using a small screwdriver through the ventilation slots and turn the fan. Rotate the motor until the blades are in a position where you can sharpen one edge of all blades. The trimmer can be held in a bench vise padded with a rag to make this a one-person job. Hold your grinding wheel to maintain the factory ground angle on the blades. If you sharpen your trimmer every few years, you don't need to grind very long to get the blade sharp. After you finish one side, rotate the motor shaft to move the blade to the opposite position and sharpen the other side of the teeth.
After the heavy rain last night, we had to clean up the MUD tracked into the house by the dog.