Many technical devices invariably require a propeller or, as it is otherwise called, a propeller. There are different goals, and for each, a specific technology and strategy should be chosen. If you are interested in how to make a weather vane with a propeller with your own hands, then this article is especially for you.
Which material to choose
What the screw will be made of should be chosen depending on its further purpose. For example, solid bars are ideal for making propellers intended for powerful engines (about 15-30 hp)
If you consider yourself an experienced craftsman, then an air plywood blank with a large number of layers is suitable for you. But lovers should not start with it, because this specimen is very fragile and can form bumps.
Instructions
So, how to make a propeller with your own hands? The process of creating a propeller looks like this:
- First you need to work on patterns, namely: 1 top pattern, 1 -sides and 12 blade templates in profile.
- Cut off the screw blank in accordance with the dimensions on all four sides and apply the axis lines, the contours of the side view template.
- Remove excess wood. First you do it with a hatchet, and then with a plane and a rasp.
- Now put the blade template on the blank and fix it with a nail in the center of the sleeve for a while, then trace with a pencil.
- Rotate the template 180° and circle the second blade. Excess wood can be removed with a fine toothed saw. This work should be done carefully and not in a hurry.
- Remove the wood without haste, making small and short cuts.
- The screw must be brought to readiness with a planer and rasp with a check in the slipway.
- In order to make a slipway, you need to look for a board of the same length with a size screw, and also allowing its thickness to make cross cuts of 2 cm in order to install templates. For the manufacture of the central rod of the slipway, solid wood is required. And its diameter should be the same as the diameter of the hole in the screw hub. The rod should be glued to the surface of the slipway at an angle of 90°.
- Put the screw on and see how much wood needs to be cut in order for the blades to match the profile templates.
- As soon as the bottom surface of the screw begins to match the templates, you can start finishing the top surface. This operation is very important, as the quality of the resulting screw is based on it.
It is not uncommon for beginners that the blades do not match in size. For example,one was thinner than the other. But in order to make the correct propeller, you will have to achieve their equal size by reducing the thickness of the other blade. Otherwise, the screw will not be balanced. Small mistakes can be easily corrected. For example, stick small pieces of fiberglass or grease with small sawdust that is mixed with epoxy.
Prop balance
An already made screw needs to be balanced. That is, to ensure that the weight of the blades matches. Otherwise, when the screw rotates, shaking will occur, entailing serious consequences - all the most important components of your device will be destroyed.
But in practice there are cases when skilled craftsmen who do not wonder how to make a propeller, the weight of the blades varies. And this is even with all the nuances in the manufacture! There are many explanations for this: different specific gravity of the various components of the bar from which the screw is made, different layer density and many other reasons.
But there is a way out of this situation. It is necessary to adjust the propeller blades by weight. True, there is one "but" here.
In conclusion
So how do you make the right propeller? In no case should you plan wood from a heavier blade. Just the opposite - you need to make the smaller blade heavier by riveting lead.
That's the answer to the question of how to make a propeller if the propeller does not move during balancing. We strongly recommend that you observe all personal safety measures. The propeller is the firstturn an object that rapidly rotates around its axis, which means that it can potentially be dangerous. If you're trying to figure out how to make a propeller, then make sure you follow safety as well.
