This material will be of interest to all masters who have machines in their arsenal - turning or drilling.
It will also be interesting to show this effect to students using a screwdriver with speed control.
In this article, Alexey, the author of the YouTube channel "Aleksey Leontev Workshop", will tell you how to make a simple indicator of turns.
Materials
- sheet plywood
- Bolt M10, nut
- Paper, printer
- PVA glue.
Instruments, used by the author.
- Band-saw
- Lathe
- Wrench
- Screwdriver, or drilling machine
- Drill 10 mm
- Scissors, marker.
Manufacturing process.
So, first of all, the author prints out such a cunning picture. The smallest, central ring at number 1 has only two sections - one white and one black. The largest, ninth outer circle has 48 black and white sections.
The archive with the drawing can be downloaded from the link to Yandex drive.
Then cuts out two printed drawings. As you can see in the photo the number of revolutions for each section is indicated.
Attaches the drawing to the plywood trim, marks the outline. Then he puts a little glue, and glues the drawing.
Then cuts the workpiece on a band saw, you can use a conventional or electric jigsaw.
The drawing also sticks to the other side.
Now he drills a hole in the center of the workpiece. It is important to make it exactly in the center, otherwise there will be an imbalance.
Now inserts a bolt into the hole and clamps the nut.
To demonstrate the principle of operation of the tachometer, the author will use a lathe with a variator. And the number of revolutions per minute from 500 to 2000. Clamps the disk in the cartridge.
And here is the speed control knob.
As a light source, you must use a fluorescent lamp with a conventional inductor, those that flicker nasty. Or a lamp that flickers at a frequency of 50 hertz. The effect of the movement of elements in one of the rings disappears - they somehow stop - this corresponds to a certain number of revolutions per minute.
Or like that.
In exactly the same way, you can measure the shaft speed if you stick a similar scale not in the form of a ring, but in the form of a strip. You just need to create the same number of sections on it. This principle is used in vinyl players to accurately set the speed of the record.
Thanks to Alexei for an interesting idea for the tachometer!
Good luck to everyone, good mood and interesting ideas!