Max. shredded material diameter
The largest thickness of debris that the shredder can handle normally. This parameter will allow you to evaluate how a particular device is suitable for a particular situation.
Note that the maximum diameter of the crushed material is important for models that allow working with branches (see "Chipping"). But in specialized aggregates for leaves, it is usually not indicated at all: the thickness of the garbage processed in such grinders is, by definition, small, and creating a design that works normally with any “soft” materials is usually not a problem.
Shredder speed
The speed of rotation of the cutting tool of the chopper (see "Crushing system"). Variable speed models (see below) usually have a maximum RPM value.
In general, the general pattern is as follows: with equal engine power, the higher the speed, the lower the torque (see below), and vice versa. In addition, high speed improves performance (see "Bandwidth"). At the same time, this parameter in most cases is more of a reference value than a practically significant one: manufacturers select the rotation speed in such a way that it provides the claimed throughput and at the same time maintains the torque at a sufficient level for efficient processing of materials that were originally calculated design. Therefore, in some models, revolutions may not be indicated at all, and when choosing, it is worth focus on moments that are closer to practice.
Motor type
Model of the engine installed in the grinder. The main performance data of the engine is usually indicated in the general data for the unit. However, knowing the exact name of the motor, you can find more detailed information on it — from specific data to reviews and reviews. Also, data on the engine model can be useful when searching for spare parts or consumables.
Engine size
The working volume of the internal combustion engine (gasoline or diesel, see "Engine type") provided in the design of the grinder. Larger engines of the same type (see above) are usually more powerful, but they also consume more fuel. At the same time, it should be noted that in fact it is more convenient to choose a grinder according to the thickness of the processed material, productivity (see above) and other characteristics that directly affect the efficiency of work; The volume of the engine is a secondary parameter, although it allows to some extent to assess the overall level of the unit.
Motor power
The operating power of the chopper engine in horsepower. This unit of measurement is traditionally used for gasoline and diesel models (see "Engine type"), but among them it is gradually being replaced by watts. For details on the value of power in general, see paragraph "Engine Power" below; here we note that 1 hp. approximately corresponds to 735 watts.
Fuel tank volume
The volume of the fuel tank provided in the design of a gasoline or diesel chopper (see "Engine type")
The larger the tank, the longer the unit will be able to operate without refueling (at the same flow rate, see above). On the other hand, the volumetric capacity has a corresponding effect on the dimensions of the grinder (and in the filled state, also on the weight).
Noise level
The maximum noise level produced by the grinder during normal operation. The comfort of using the unit primarily depends on this indicator: strong noise can be very unpleasant, and at high volume it may even require the use of protective headphones.
Shredders are a rather “loud” type of modern technology, even in the quietest models the noise level is about 83 – 85 dB — this is comparable to the sound background on a busy city street. Note that the decibel is a non-linear quantity, so it is best to use comparison tables to estimate specific noise levels. Here are some guideline values:
- 90 dB — freight car at a distance of 7 – 10 m;
- 95 dB — subway car (inside), perforator;
- 100 dB — symphony orchestra, demolition hammer;
- 105 dB — home theater at maximum volume;
- 110 dB — indoor rock concert.
