There is a
suggestion that the glass being ground should be passed along the in the
direction opposing the spin of the grinding bit.
The grinder bit
rotates in a clockwise direction as you look down on it. This means the grinding surface is moving toward
the left. The recommendation is that you
will get more efficient grinding by passing the glass to the right, against the
rotating direction of the bit.
This is more
theoretical than practical. In practice, the bit is spinning so rapidly that
only a minor difference, if any, can be perceived. Without a noticeable difference, there is no
reason to be concerned. Move the glass you are grinding in the directions that
you find convenient. You will find a little more resistance when you move the glass from left to right, rather than the other way.
You are much more
likely to damage the bit and grinder motor by excessive pressure against the
bit than by any directional movement.
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