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In this video I'll show you how I balance my grinder with abrasive wheels.
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It happens when, after replacing the abrasive wheel and even after leveling it, the grinding machine vibrates strongly during operation. This is caused by an imbalance in the circle. Need to balance the grinding wheel.
There is a known method of balancing abrasive wheels due to the fact that a metal disk is additionally installed on the shaft along with the wheel with an offset. The disk is displaced so as to compensate for the existing imbalance of the abrasive wheel.
I do it, it seems to me, in a simpler way, in which it is not necessary to make a disk with a hole.
As a disk, I take lids for glass jars, and to create a compensating imbalance, I use plasticine.
With any method, two questions arise: in which direction should the compensating weight be placed and what is its size.
Both questions are decided purely empirically.
The location of the weight is usually determined as follows. They spin the shaft several times and notice in what position the circle stops and this place is marked. Usually the mark is placed at the bottom of the circle. This will be the hardest part of the circle. So, the weight must be placed opposite this place.
By adding and reducing the load (plasticine), I achieve minimal vibration. Vibration displacement is measured with a vibrometer.
In my opinion, my method - with lids and plasticine - is better than the method with a metal disk.
To move the disk to eliminate the imbalance, you have to unscrew the disk fastening nut each time. Re-tightening may cause the circle to shift. In this case, the beating may again appear, which we eliminated by leveling. When using a cover with plasticine, the circle is fixed only once, and its position no longer changes, is not disturbed.
My advice is this. If you change one wheel on a well-working machine, then before setting, setting, aligning and balancing a new wheel, you need to balance another, without a new wheel, so that there is no mutual influence. And then to put a new circle.
If you change both circles, then balance them in turn. First, only one circle, and then add another.
We eliminate, as much as possible, the imbalance with the help of plasticine. The machine will make less noise. It is no longer clear by ear whether the imbalance and vibration displacement decrease or increase when the position of the plasticine changes. Then, if there is no vibrometer, it is necessary to apply some methods for assessing the vibration displacement.
Two methods are shown. In the first method, a metal rod is taken, for example, a reamer, and one end touches the motor support or machine casing. With a vibration displacement of more than 80 ... 90 microns, the reamer begins to bounce, knock.
In the second method, a kind of vibration amplifier is used due to the resonance effect. Shown in an example. I took the wire, glued it to the magnet. Installed the magnet on the cover. At the end of the wire is a weight-magnet.
With vibration on a support of 100 microns, the vibration of the wire is approximately 10 ... 15 mm. When the vibration on the support is 16 µm, the vibration of the wire is 2…3 mm.
The old method of using a coin does not give any idea of the magnitude of the vibration. And you can accurately determine the vibration using a vibrometer.
This is how I reduce the imbalance of the grinder.
If the machine is well balanced and the wheel is level, then it is safe and pleasant to work on such a machine. And the work is better.