I had the need to cut a piece of metal pipe recently. I took a hand saw for metal and spent a long session of physical training. I seriously thought about the advantages and benefits of such things as flex (orbital action polisher) after that. So this post will help you to choose good electrical flex to meet your household needs.
Angle grinder (flex, angle grinding machine) is a handheld electrical power tool that is designed for cutting, cleaning and polishing of hard materials such as metal, stone, concrete and so on.
Flex structure is not very complicated. Case is the main grinder part, the electric motor is located in it. Flex motor associated with a rotating spindle through a bevel gear. Working nozzles are installed on this spindle.
You should pay attention to the next flex characteristics when you will make a choice:
1. Flex power.
Productivity of the tool depends on its electrical power. Productivity of the tool depends on its electrical power.
Modern angle grinder power ranges from 0.5 kW to 2.7 kW. If you, like me, have occasionally needs to saw or polish something – you can choose 0.8-1.0 kW flex power. If you want to cut concrete take a look at models with 1.5-1.7 kW power.
2. Maximum disk diameter (size).
Thickness of material that can be cut using flex machines depends on the diameter of the cutting disc. Flex disk can have a diameter of 115 to 230 mm. The maximum diameter depends on the tool power. More powerful models can handle larger cutting disks.
It should also be noted that the models with 115-125 mm disks preferably equipped with one handle and used for household purposes. Professional flexes with 180-230 mm disks have mostly two handles. However additional removable handle can be even in the simplest models.
Hand-held grinders with 125 mm disc size, which is suitable for most household needs, are the most popular models.
3. Rotation speed.
Rotation speed indicates how many revolutions per minute does the flex spindle and nozzle, which is installed on it.
Rotation speed can be from 2800 to 11000 revolutions per minute (rpm). Smaller disks rotate at a high speed, large disks rotate at a slower speed.
Grinder disk with a 115 mm diameter mainly used on speed 11,000 rpm, 200-230 mm diameter grinder disks are used at speeds up to 6600 rpm.
Exceeding of the permissible speed can lead to the destruction of the disc, cause tool breakage and even injury operator.
Possibility of regulation of number of spindle speed, depending on disk size, is provided in many flexes. Regulation made by a special regulator, through which you can increase or decrease the speed.
4. Smooth start.
The flex is quite powerful electric tool (with a power of 2.0-2.5 kW it can be comparable even with iron or washing machine), so its switching may have large peak loads on electricity network.
The smooth start system helps to avoid such peak loads. In addition, the smooth descent allows avoiding mechanical jerk when flex switched on, and this is very important. The physical wear of details and the possibility of damage of the material significantly reduced in this case. The risk of injury is reduced too.
Since the flex is a hand tool, its convenience and weight is not the last factor in the selection. Particular attention should be paid to the convenience of handles, because with it you will manage the process of cutting or grinding.
Also, the handle will take the bulk of the vibration, so many manufacturers try to make it with anti-vibration coating.
Flex weight depends on its power. 0.7-0.8 kW power flex will weigh about 1.5-2.0 kg, 1.0-1.4 kW – about 2.2-3 kg, over 1.5 kW – 3.5 kg and more.
For example, the flex Bosch Professional GWS 22-230 with 2.2 kW power weighs 5.4 kg.
6. Angle grinder work safety.
Working with angle angle-grinding-machine requires great attention and implementing of necessary security measures.
Flex should be equipped with special protective casing, through which the operator is protected from dust, sparks and contact with various small particles. This casing is the main protective element.
It is recommended to wear safety glasses and gloves when working with flax, as well as with a chainsaw. If you don’t want to hear the sound of flex you need to wear special headphones.
I guess now you’ll know better what is the best angle grinder.