Blade Making - Electrochemical Method

Making a blade at home is an electrochemical method. To create a blade with your own hands at home, you can use 2 options: a mechanical method, for example using a grinder, grinding wheel, and an electrochemical method, consists in anodic dissolution of the metal during electrolysis, which is simpler and does not require significant effort.

Materials and tools:

  1. the canvas saw blade is used for cutting railroad rails (or another blade from which you will make the blade)
  2. salt, bath, water;
  3. 9 V power supply (voltage converter or telephone charging).

Step 1

For the manufacture of the blade, we take the blade for the mechpila for sawing railroad rails (or another), such a canvas is easy to find, for example, a flea market or in the construction market.All machine saws have production hardening, which means that the blade is durable and at the same time, such a sheet is difficult to machine.

Take a blank of the future blade and draw the blade shape on it, then close the shape of the future blade with varnish, for additional protection, paste the insulating tape on the dried varnish. The protective layer must be above the electrolyte level, since splashes are possible during operation, which will leave marks on the unprotected surface.

Collect the circuit shown in the figure. Need: DC power supply, copper electrode and saline solution. First we make a salt solution, about 2 tablespoons per half-liter jar of water, dip the billet into the solution and connect it with the “+” to the power source, use a copper (brass) plate or wire about 5 cm as a cathode, we also omit it in the salt solution and connect it to the "-" with the power source. Connect and connect to the network, after the supply of current at the cathode will begin to appear air bubbles. During the process, it is necessary to periodically clean off the insulating layer forming on the workpiece, which slows down electrolysis (after about 3 days a plate is obtained that is easily broken by the fingers).

Step 2

Having broken off the resulting brittle plates, we proceed to further processing. On the grinding wheel, we will begin to draw descents (we remove the descents by 0.3 mm); we will continue more accurate formation of descents on the grinding stone (grain size is M63). Before use, the grinding stone should be held in water for 15 minutes. During operation, the surface of the stone should be moistened periodically with water, it should always remain wet. Also, the surface of the stone must be perfectly flat, otherwise the slopes will be filled up, i.e. the line between the slopes and the descents will be inexpressive.

Step 3

After that, the blade is ground and polished. First, on stones, and then rubbing in with grit from 100 and 2000 grit pasted on sandpaper, then with diamond paste and GOI paste. The polishing process is long with a gradual decrease in the grain of the grinding surface. Final grinding and mirroring should be carried out when the knife is fully assembled.

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