Trimmer Nozzle To Prevent Grass From Flying

For many summer residents, the trimmer has long become a familiar and almost indispensable technique. But it is not always possible to acquire a model that allows you to satisfy all needs. It happens that the trimmer copes with fresh young vegetation easily, but there is a desire to clear a place behind the fence or along the driveway, and tall, ripened grass turns out to be “too tough”.

DIY trimmer head

We offer the option of self-manufacturing a nozzle for a trimmer from simple (almost improvised) tools.

Materials:

• Perforated metal plate (100 mm x 240 mm)
• 2 hacksaw blades for metal
• 4 screws and 4 nuts M5
• 4 washers and 4 enlarged washers

From a safety point of view, hacksaw blades should not be completely red-hot.

Everything you need to make the nozzle

The most difficult part in making the nozzle is to symmetrically mark and make holes for the knives and the trimmer shaft. That is why the finished perforated plate is chosen.

Progress:

First you need to make the base of the nozzle. To do this, we cut out a square grinder from a metal plate with a side of 100 mm. You need to mark it in such a way that a hole is located exactly in the center (at the intersection of the diagonals). To do this, measure the distance of 50 mm from the center of the selected hole perpendicular to the short side of the plate and mark the cutting line.

Mark the base of the nozzle

We cut off the excess and get a square of 100 mm x 100 mm. Now you need to slightly round the corners and drill a central hole under the trimmer shaft.

Round corners and drill a center hole for the trimmer shaft

We cut the metal sheets, measuring 8 cm from each end. We get 4 workpieces with ready-made holes.

We cut canvases for metal

These blanks need to be shaped like knives. To do this, we outline the cut line on the eye (special accuracy is not required), we fasten all 4 workpieces together and grind the excess.

We cut knives from blanks

As a result, we get the knives of the same weight and size, they can be sharpened a little on one side. Now all the parts of the homemade nozzle for the trimmer are prepared, you can start assembling.

Everything is ready for assembly

We put a small washer on the screw and insert it into the corner hole. We put on a knife from above, placing the sharpened side in the direction of rotation of the trimmer shaft. Next comes a large washer and nut, which is not tightened so that the knife rotates freely. In the same way we fix the other 3 knives.

Fasten the knives

The end of the screw must be riveted so that the nut does not fly off.

The end of the screw needs to be riveted

The nozzle is ready. It is installed with nuts to the ground and fixed in the same way as a three-blade knife, which comes complete with a trimmer. In a collision with a stone, the knives fold and go a little inside.

This idea was suggested by our regular author of the Tatyana (Tula region). You can see in more detail the whole process of manufacturing such a nozzle for a trimmer and find out some of the nuances by watching the that she prepared.

When working with a trimmer, it is important not to forget about safety precautions using any attachments, especially homemade ones.

We suggest discussing this idea in the comments to the publication. Share your thoughts with us, as well as tell about your successful solutions.

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Without accepting either side of this sharp (literally and figuratively) discussion, let me show you one of the latest models of lawn mowers by the German company Robert Bosch. It also provides for a deflecting knife and an arched staple, which excludes the “striking” of the knife for objects not envisaged by mowing. I show the general view of the lawn mowers and the knife itself, in two positions.General view of the lawn mowers

Deflected knife

Folded knife

Good evening everyone!Exactly three years have passed since the discussion of the “acute” problem for the trimmer. Over the past 1000 days, a clear picture has emerged: “Glory to the author, a craftsman who carries out an experiment on himself to achieve the yield strength of the metal from which these knives are made. He has every right to risk his own health. ” Now in stunt films, you can often see a fairy tale. “Do not try to repeat the movie stunts performed by professional stuntmen.” The very first article should have ended with about the same phrase:” Dear summer residents. This is my personal experiment. If you are not confident in your locksmith powers, please do not repeat it. And MOST IMPORTANT. I am not responsible for the operation of the tool, made in the wake of my article.”And the last one. Do I see errors, judging by the photographs, the implementation of this tool. Yes, I see, and rude. Look carefully at the plate, which is the carrier for the four knives. Look carefully at the FAR RIGHT FOR US HOLE in the photograph.

Alas, the author of this apparatus does not even suspect how a hole should be made under the shaft.

I inform you. The distance from the hole point closest to the edge of the plate to the very edge should be NOT LESS THAN the diameter of the hole itself. Students of mechanics will learn this truth no later than the second year of the institute. What do we see here? A thin isthmus resembling a narrow Perekop making a peninsula from Crimea. This is a priori a place that is weak in this design. It experiences the same loads as other knives, but the “digging” is very thin there.Where subtly, thereI would like to hope, and quite sincerely, that over the past three years this isthmus has not undergone loads comparable to the yield strength of this metal, but rather the alloy from which the hole plate is stamped.

By purchasing a gas trimmer, the owners of country houses and summer cottages receive a fairly powerful and autonomous tool for various agricultural work. Over, manufacturers often offer various nozzles for them. Brush cutters, dead wood choppers, blowers Today we will talk in detail about the cultivator nozzle for the trimmer.

Design and mounting options

The cultivator nozzle comes in two versions:

• A disc, the cutting organs of which are a pair of cutting discs;
• Toothed, which is a series of cutters sequentially located on the shaft.

The fundamental difference lies only in the design of the cultivating unit. Disk nozzles are harder and therefore suitable for processing heavier soils, while toothed ones have a lower dead weight, but are designed for work on lighter soils.

The transmission of torque from the trimmer motor to the cultivator nozzle is carried out using a special shaft, which is arranged in a special rod (it will have to be purchased separately). This node is not interchangeable, and differs in the number of slots on the end of the rod: there may be seven or nine. Therefore, when planning to purchase a cultivator attachment, you need to understand that the Oleo-Mac attachment will not work with the Husqvarna trimmer, as well as vice versa.

The splined way of attaching discs or milling cutters to the shaft allows free movement of the cutting organs, which is ideal for cultivation, since it allows loosening the soil with a sufficiently wide grip (up to 200 250 mm per pass), without requiring a large amplitude of movement of the rod. Also removed are the restrictions on the density of the beds located on the site. With the extension of the beds, the convenience of working with the nozzle in question increases, since the turns will have to be done much less often.

Features of the nozzle

Any cultivator nozzle for the trimmer significantly increases the weight of the entire device assembly (by at least 5 6 kg). Therefore, long-term work with such an instrument is not for everyone. It is also necessary to introduce mechanical constraints on the power of the trimmer drive into the calculation. If the engine is designed for a power of no more than 1500 W, then the cultivator can only be cultivated with regularly loosened soil, or limited to hilling of breasts, potato bushes, etc.

Since the drive of gasoline trimmers is located behind the working one, and the drive rod is quite long, vibrations constantly occur during cultivation. Their value is determined by both the length of the rod and the changing load on the disks or mills. These vibrations are transmitted through the shoulder strap to the user’s hands, so it’s not always convenient to control the trimmer’s power button and hold the canopy. Therefore, prolonged soil cultivation using a cultivator nozzle is unsafe for health.

But not everything is so bad: the mobility of the gas trimmer makes it easy to cultivate the soil between the rows, and the absence of wheels on the mounted cultivator does not damage the plants on the beds.

The cultivator nozzle “does not like” compacted soil, and when it is first introduced into such soil, the rod drops sharply. Therefore, disk cultivators are equipped with a safety casing (toothed milling cutters are more likely to bend than break, although in this case a low protective shield from the legs would not hurt). The presence of a safety screen affects the visibility of the cultivator.

Is it worth it to do the cultivator nozzle yourself?

The price factor has a significant impact on the choice: whether to purchase such a nozzle, or to make it yourself. High-quality cultivator nozzles for the trimmer can be purchased at a price of 11,000 20,000 rubles, which justifies itself only with large volumes of work. It is inappropriate to buy such a node even in cases when the cultivated soil is heavy (for example, chernozem or loam): the cultivator does not raise the soil, but only moves the clods of earth from one place to another, moreover, together with the roots of the weeds or grass pulled out.

The technology for caring for vegetation will change: first, with a nozzle-knife, it is worth walking through the beds, cutting grass, and only then use the cultivator nozzle.

Having decided on the independent manufacture of the cultivator attachment to the trimmer, you should first evaluate the following:

1. The design of the outlet section of the boom: if it is a flexible shaft, then you will have to forget about the cultivator: it will not be able to withstand constantly changing torques in amplitude. The cardan transmission is more functional, and the most successful design is the multi-spline rod, moreover, direct, and not curved.
2. Drive power: if it is less than 1000 watts, the engine will overheat, and cultivation performance will drop sharply.
3. Fuel tank volume: energy consumption will increase significantly, since the cultivator nozzle will have to be made from improvised materials. Therefore, the tank must contain at least 1 liter of fuel.
4. Handle design. Ergonomic experts believe that the most convenient is the T-shaped handle, which provides the most accurate and reliable direction. It is difficult to hold a gas trimmer with a cultivator attachment, which is common in some models with a J-shaped handle.

If the existing trimmer meets the above requirements, and its owner has sufficient experience in performing such work, then it is quite possible to make a disk nozzle with your own hands. As for the gear type nozzles, their independent production is very time-consuming, and will not provide the desired quality.