Bernina a170 Manual page 95

Important information on buttonholes
A B
Thread tension
· thread the finger of the bobbin case
· the bobbin tension will be slightly tighter than normal
· this gives a slightly rounded appearance to the beads,
making the buttonhole more attractive
Manual buttonholes
· stitched using Buttonhole foot 3
· the buttonhole length of manually stitched buttonholes
must be marked on the fabric in the appropriate
position
Automatic buttonholes
· stitched using Automatic buttonhole foot 3A
· mark the length of the first buttonhole
· after sewing the first buttonhole, the length for all
subsequent buttonholes is automatically programmed
· mark the starting point of all subsequent buttonholes
· Buttonhole length = buttonhole opening in mm
Test sewing
· always sew a test on the fabric(s) you will use with the
same interlining, interfacing, and stabilizers
· select the same buttonhole type
· sew the buttonhole in the same direction on the
fabric (with or against the grain)
Corrections
To adjust the bead width:
· alter the stitch width
Altering the stitch length:
· any alterations to the stitch length affect both beads
(making them more or less dense)
· always stitch a new sample to reprogram the buttonhole after
any changes are made to the stitch length
Balance for automatic/manual buttonholes
· any balance alterations affect both beads
Balance for stitch counter buttonholes
· any balance alterations affect the first (left) bead:
Bead too dense– if the first bead looks like
A, use the "down" arrow to correct it
Bead not dense enough – if the first bead looks like
B, use the "up" arrow to correct it
· always stitch a new sample to reprogram the buttonhole after
any changes are made to the balance
Clear balance
· press the external clr button
030787.52.04_Nähen_04-01_a165 a170 a180_EN
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Buttonholes