When you need to replace a watch crystal,
sometimes you will have to order a generic watch crystal or a crystal blank that
comes in one of several standard sizes but might not be the right size for your
watch case. If this is the situation that you find yourself in and you realize
that you'll have to cut down the crystal quite a bit to ensure a perfect fit for
your watch case you can do so with the
help of a crystal grinder. Learn how to use a crystal grinder to cut your
crystals to the right size and shape with this
The first thing you need to do is determine how much you need to change the
crystal, particularly noting which sides you need to trim and by how much. Once
you have that figured out, put on your safety glasses to protect your eyes while
Start your crystal grinder and lubricate the wheel. Then, holding the crystal
firmly in one hand, press the edge that needs to be changed lightly against the
rotating wheel. Be sure to hold it at a ninety degree angle to the grinder to
ensure an even change to the crystal edge.
However: DO NOT hold the crystal steady in one place. You can wear down
the grinder and potentially damage the crystal with debris from previous
grindings if you don’t move the crystal slightly across the surface of the
grinder as you work.
Remove the crystal from the grinder and check the progress you have made.
Once you have a feel for how quickly the grinder trims the crystal, you can
increase the pressure against the grinder to achieve a more drastic cut. Before
continuing to shape the crystal, be sure to re-lubricate it to protect it. By
keeping both the crystal and the grinder lubricated throughout the trimming
process you protect the crystal from chipping or breaking while you trim it.
Check your progress frequently. Once you are satisfied with the size and shape
of the crystal, you can clean up any rough edges by very lightly pressing the
crystal against the grinder at a slight angle.
Finally, you should buff and polish the crystal to remove any scratches that may
have occurred while trimming before setting it in your watch case. Learn
How to Polish
and Buff Away Scratches from a Watch Crystal here, or to learn more about
placing watch crystals, you can check out our