The tea grinder does not grind. It makes about 1/3 rotation, then stops for a little bit, and does another 1/3 of a rotation. After about 20 seconds of this it stops rotating all together, and just waits until it gives off 4 beeps after about 1.5 minutes of waiting. From what I have seen of demonstration videos I believe that it should be rotating continuously at a much higher rate than mine does. This happened from the first time I used it.
「ビデオでの見たところでは」は、「ビデオで見たところでは」と訂正いたします。
「茶臼は、挽くのではない。」は「茶臼が挽けない。」と訂正いたします。