Are pre-wound bobbins safe to use in the Memory
Craft 10000?
It's very convenient to use pre-wound bobbins, but you need to be
careful. There are 2 types of pre-wound bobbins generally available:
 | Type A bobbins, which are slightly larger than our
class 15 Janome bobbins |
| Type L bobbins, which are just a little shorter
than our class 15 bobbins
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The A bobbins hold about 30% more
thread than one of our bobbins wound completely full. However,
the often are constructed from a plastic spindle with cardboard
disks on the top and bottom. When the bobbin approaches empty,
the cardboard on the top side can slip down. Because the bobbin
is a little higher than normal, it's extremely easy for the
needle thread to start wrapping around the spindle. Within
seconds this can effectively sew the hoop to the needle plate,
preventing it from moving. The machine doesn't know this has
happened and keeps sewing. The carriage arm keeps moving, but
the hoop can't and the machine can be misaligned or damaged.
Therefore, we absolutely do not recommend the
A bobbins with cardboard sides.
|
 The L
bobbins don't hold as much thread, but can still be used. One of the
more popular ones is solid plastic, like Janome bobbins, and is
sold under the NEB brand. We sold these until Janome started
offering bobbins pre-wound with Robison-Anton bobbin thread.
There are a couple of things you need to know about these:
- Because they are shorter, when they start getting low
they tend to bounce and rattle in the bobbin case. This is
generally more annoying than dangerous.
- Sometimes the bobbin thread is tied to the bobbin, so
when you get to the end, the last of the thread cannot be
fed off. This leads to lots of scary noises, and if you
don't stop the machine right away, machine damage is
possible. Use caution as you get near the end of the bobbin!
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