Baby Lock Jewel Service Manual
© Baby Lock, all rights reserved
32
Thread Shredding & Breaking Issues
•
Loop lift - set incorrectly
•
Needle bar height – set incorrectly
•
Needle distance - set incorrectly
•
Bent
needle
•
Damaged needle – needle has been damaged – hit or deflected off something and
now has a small burr which catches and damages the thread.
•
Defective needle – a needle that in manufacturing ended up with a small burr,
deformity, or defect that catches the thread and damages it on the needle point. See
note below.
•
Bad thread – old, rotten, cheap, weak, poor quality, etc.
•
Note: because we are doing freehand sewing – moving the machine over fabric held
in place on the frame – it is possible to pull or push the thread under the needle -
thereby “sewing over or into the thread”. The needle point actually hits and pierces
the thread damaging it. A needle with a good or polished point can greatly help
reduce this problem.
•
Pushing the machine too fast or too slow causing fabric damage, needle damage or
needle collisions.
•
Defective lower paper clip type thread guide – nick in chrome which damages the
thread.
•
Defective lower needle bar clamp thread guide – cracked chrome which damages the
thread.
•
Other thread guides with defect, nick or groove which might cause thread damage.
•
Thread mast not over center of cone.
•
Cone moving around on spool pin.
•
Thread catching on cone, spool or anything causing momentary thread tension
changes