As usual, the "experts" have sounded off.
Myth #1. "Once the coil is cut, there's nothing to contain the force
caused by the hardening of the wire the coil winding caused." When
round coils are removed from the winding mandrel the tension has
been removed and they are in a relaxed state. Cutting them into jump
rings produces rings identical to those that are still uncut. Because
our MultiShape rings must be cut on the mandrel to relieve the
tension, these will expand.
Myth #2. "They do make smaller blades. The one I use for small
diameter rings is only 3/4" diameter and you have ' to cut slow or
the blade will deflect." The writer of this claims to use 3/4"
diameter blades in a Jump Ringer for cutting small diameter rings.
Using smaller diameter blades of the same thickness will have no
effect upon the cut width (kerf). In addition, I question how a 3/4"
diameter blade will cut anything in a Jump Ringer.
Again, I must state that based on my inventing the Jump Ringer and
35 years of experience working with and improving it:
The amount of distortion caused by closing a round jump ring to
compensate for the width of the cut is dependent upon the diameter
of the ring and the width (kerf) of the cut. It has nothing to do
with the thickness of the wire, the diameter of the blade, the
hardness of the wire if its tension has been relieved before cutting
or the phase of the moon.
Ray Grossman Inc.