Greetings to all lovers of homemade products and those who just looked at the site in search of interesting ideas and gadgets that can be useful on the farm. Do you often have to chop wire or metal bar? For some, yes, but for some periodically. Of course, a wire of small diameter can be cut with nippers, and the bar, if necessary, can be cut off with a grinder, if there is one, of course. And if not, then you can make a simple device – scissors, as the author did. I also want to present his homemade product to your attention. If you are interested in the idea, read the article below, at the end there will be a video from the author.
* three gears, two more, the same and one of small diameter (I do not give the exact dimensions, here you can choose as you wish, but the thickness of all gears should be the same),
* sheet steel (thickness is also at your discretion 8-10 mm, it can be a little less),
* metal round timber with a diameter equal to the diameter of the inner holes of the gears.
* a section of a channel with a width of 10-12 cm,
* disc cut-off machine,
* welding machine,
* gas torch,
* drilling machine,
* metal bit with a diameter of 25 mm,
* marking tool (marker, vernier caliper, ruler),
Preparation of the necessary material. Among his trash, the author found three suitable gears, in addition, in a pile of scrap metal, he found a sheet of steel and a round timber of a suitable diameter, in his case it is 25 mm.
On a sheet of steel, the author put two gears, one large and one small, and brought them together through a paper pad. I measured the distance between the holes with a caliper, first along the near walls, it is 67 mm, then between the far ones – 117 mm. I added these readings and divided the result by two. Got a size of 92 mm. Then you will understand what it is for.
The author put a mark on the steel sheet, measured the size 92 mm with a caliper, and put another mark, connected them with a line. Then I cut out a rectangle of the desired size (determined by eye, based on the diameter of the large gears) with this line. Then I cut out another rectangle of the same kind.
I folded both rectangles into a “sandwich” and welded them along the edges at the corners. I took a metal bit, installed it in a drilling machine and drilled holes with a diameter of 25 mm according to the marks.
Putting the plates aside, the author took up the gears. Bolted them through the holes. I put a mark on the top gear and drilled a hole along it, a diameter of about 10-12 mm. Then, tangentially from the hole, I drew lines to the teeth with a marker. Along these lines I cut a segment in two gears (without disconnecting them), cut the cuts with a file.
Surely you already understood what these grooves are for, quite right, this is the working part of the scissors – a kind of blade. And they need to be tempered, which the author actually did. Heating the opening and the edges with a gas burner, the author lowered the gears one by one into working off.
The turn of the round timber has come. From it, the author cut off two blanks of the required length, here the thickness of the steel sheet is taken into account, plus the total thickness of the two gears, plus a small allowance for the gap, about 2-4 mm.
We return to the plates. The author laid them out on a workbench. I inserted round timber blanks into the holes of one. On one I threw a certain number of washers, then a small gear and one washer on top of it. The second has two large gears. From above, I covered everything with a second plate. Please note that the total thickness of the washers should be equal to the thickness of one large gear.
That is, here the washers seem to compensate for the missing thickness, and the smaller gear in the engagement with only one large gear.
Then the author again installs the second plate, tightens the knot with a clamp and installs it on the base from the channel, which has already been cut to the required size along the length. Then he welds the plates to the channel.
After that, a piece of pipe is welded to the smaller gear (the diameter of the latter must be equal to or slightly less than the thickness of the gear).
Next, a gear with a handle is installed back between the plates, and the round timber is welded to the plates from the outside.
As a result, the following is obtained, moving the smaller gear with the handle up and down, the large gear with which it is in engagement moves, as a result of the movement, the grooves are displaced relative to each other (the second large gear is stationary, it is welded).
Here's the fixture and you're done. At the final stage, the author tests it in practice and demonstrates to us its capabilities. The scissors can easily cut through wire and bar, and also cope with the bolt. Film In general, it turned out well.
Personally, for greater aesthetics and for additional protection against corrosion, I would paint it. But this is my personal opinion. In general, if you like the idea, take note. Thank you all for your attention, the video below is as promised.