This article will discuss how to mark the rotor (in our case, 26 equal faces) for gluing magnets. Well, let's get started. We offer 4 marking methods for gluing magnets:
The first method is very simple. Turn to a milling turner who has a dividing head and it will help you to divide the rotor surface into a polyhedron. Turner will tell you better about this method by completing this work. Note, in our case, divide 360 degrees into 26 poles, we get an angle of 11 degrees 84 minutes.
The second option is also instrumental. If the turner has a simple scale on the chuck of his lathe and your number of poles is divided by an integer (a whole degree). Since 84 minutes was very difficult to do without the use of tools, we will accordingly consider 2 more ways at home.
For the third method, in the "Compass" program, you need to draw your rotor, divide it into 26 poles, measure in the program a straight line that passes between two adjacent points (not the circumference, but the direct distance).
The figure shows our distance between the points is 11.46, but the average figure that the program gave us is 11.4459 (11 millimeters and 45 hundredths of a millimeter).
Above, an error was made in degrees, minutes, seconds, or rather it will be so - 360/26 = 13.84615384615385 degrees (exactly 13 point 85 hundredths of a degree), this angle has a marking of one pole. On a rotor diameter of 95 mm, the size for one pole is 11.45 mm.
For the correct operation of the magnetic system, it is necessary to position the magnets on the rotor as accurately and symmetrically as possible.
Next, take a regular compass, set the distance that the program showed, and carefully begin to draw on the rotor using the direct transfer method. The method is effective if everything is done very accurately. But we did not succeed so that by 26th drawing everything would fit perfectly, there were constantly millimeters that did not converge. It would seem that a millimeter is an allowable error, but when everything is checked in the fourth way, this distortion is clearly visible. So if you have perseverance and accuracy, you can use this method, especially for him just need to know the distance between two rays in a straight line (not in the length of the bend).
Well, the fourth method at home, already tested on many projects, consists of the following actions: in the Compass program, draw a circle of 26 poles.
Further, over the inner diameter of the rotor (95 mm in our case), literally after 2 millimeters, as is done in the image, we drew the second circle and cut off the central part, after which such a workpiece came out.
These 2 mm are needed because any printer distorts the scale, it does not draw a 1 to 1 image, that is, 95 mm in the program may turn out to be 94 mm on paper and thus our second drawn diameter will be centering on the outer diameter of the shaft.
We place the template with the center between the chairs, as shown in the picture. Find the base line that the turner made and combine it with any line on the template. And we make our 26 serifs on both sides with a pencil or steel needle.
A little trick: so that the ruler does not slide off the shaft, just attach a magnet to it, and the movements of the ruler will become more controlled.
To be continued ...