Bernina L460 Operation instructions

©2020 BERNINA of America. Permission granted to copy and distribute in original form only.
Content may not be altered or used in any other form or under any other branding.
Basic Overlocker Use
For current BERNINA models
Overlocker Workbook 1
BERNINA

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BERNINA
Overlocker Workbook 1
Introduction .................................................................................................................3
4-thread Overlock Stitch..............................................................................................6
Adjusting Tension Settings ..........................................................................................7
Micro Thread Control (MTC)........................................................................................8
Stitch Length ...............................................................................................................9
Cutting Width..............................................................................................................10
Differential Feed.........................................................................................................11
Securing Seams.........................................................................................................14
Presser Foot Tape Guide............................................................................................15
3-Thread Overlock Stitch: Wide and Narrow...............................................................16
Inside Corners............................................................................................................17
Outside Corners ........................................................................................................18
3-Thead Rolled Hem ..................................................................................................19
3-Thread Flatlock .......................................................................................................20
2-Thread Rolled Hem .................................................................................................21
2-Thread Flatlock .......................................................................................................22
Color-Coded Threading Charts...................................................................................23
Table of Contents
The information in this workbook
applies to the current line of BERNINA
Overlockers. Note: Some exercises
apply only to certain models equipped
with the feature being highlighted.
Basic Overlocker Use

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BERNINA
Overlocker Workbook 1
Introduction
Congratulations on the purchase of your new BERNINA overlocker. The information in this workbook will help
you learn the basics of using your new piece of sewing equipment. Even though it is very different from your
sewing machine, once you learn to incorporate these techniques into your sewing, you’ll wonder how you ev-
er got along without it.
Your overlocker will speed your sewing in several ways, letting you produce more in less time. The speed of
the overlocker is faster than a sewing machine and because it performs several operations (trimming, seam-
ing, and overcasting) at the same time, you sew faster, and in the process, produce neater and more profes-
sional-looking results.
Because the overlocker is a specialized piece of equipment, it only “sews”
a limited number of techniques and even though the workings are more
complex than a sewing machine, it doesn’t take long to learn the basics.
The stitching exercises in this workbook use four, three, and two thread
stitch formations.
Once you have completed the exercises designated for your BERNINA
overlocker, attach the sewn samples to the indicated pages and insert the
pages into plastic page protectors and store them in a 3-ring binder. They
can then be used as a reference tool in the future as you use your overlocker
and explore the creative possibilities it affords you.
BERNINA of America strives to provide its customers with quality sewing ma-
chines, overlockers, and also with informative publications and classes.
Along with providing My BERNINA Classes your local BERNINA dealer
stocks BERNINA books and magazines, such as the Serger Technique Ref-
erence Guide and Inspirations. Instructional video tutorials are available on
bernina.com and the BERNINA YouTube channel. You will also find inspiring
overlocker projects on the BERNINA website at www.bernina.com in the Ex-
perience Section.
4-thread overlock stitch
3-thread overlock stitch
2-thread overlock stitch

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Overlocker Workbook 1
Needle and Thread
Overlocker Needles
BERNINA overlocks use the same type of nee-
dles as most sewing machines: 130/705H.
Recommended needle sizes for your overlocker
are 70/11, 80/12 and 90/14. Larger needles can
interfere with looper movement and cause dam-
age; smaller needles may not form the stitches
correctly.
Always make sure needles are fully inserted as
high as possible, with the flat side to the back.
When using both the right and left needle, the
needles will not be even when they are fully in-
serted. The left needle will be slightly higher
than the right one. This preserves the order the
threads are used to form the stitch.
Overlocker Thread
Overlocker threads are usually polyester and are finer (lighter weight) than many sewing machine threads to
avoid thread build-up and excessive bulk in seams. It is important that the thread is smooth without
variations in diameter as it needs to feed smoothly through many thread guides for good stitch formation.
You also want a good-quality thread – such as Mettler Seracor – that is not “fuzzy” and does not leave exces-
sive lint in the lower part of your overlocker. Overlocker threads are sold on cones for economy and conven-
ience; regular spools of thread may be used but will not last very long when forming overlock stitches. Along
with overlocker thread, there are applications that call for specialty and decorative threads.
Listed below are some of these threads commonly used in the overlocker:
Texturized Nylon Thread – such as YLI Woolly Nylon and Seraflock—A very elastic
thread with excellent coverage; perfect for rolled edges and knit seams. Available in solid
and variegated colors, and metallics.
Polyester Topstitching Thread – such as YLI Jeans Stitch & Mettler Cordonnet – this heavy
thread is used for decorative stitching (flatlocked seams and overcast edges). Also
nice for cover and chain stitching. Available in solid and variegated colors.
Rayon Decorative Threads – such as YLI Pearl Crown Rayon & YLI Designer 6 – shiny
threads for decorative applications. Pearl Crown Rayon is twisted, while Designer 6 is
untwisted. Available in solid and variegated colors.
Metallic Decorative Threads – such as YLI Candlelight – adds a bit of glitz to seams and edgings.
Decorative Sewing Threads – sewing machine threads can also be used in the overlocker, and are
particularly effective when several are used together as one thread.

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Overlocker Workbook 1
4-Thread Overlock Stitch
Fabric: Firm fabric, 6” x 6”
Needle: 80/12 Universal
Thread: 4 cones of overlocker thread (blue, red, green, yel-
low)
Presser Foot: Standard
Thread the overlocker for a 4-thread overlock stitch using thread colors
to match the color-coded threading path on the machine. Adjust all
thread tension settings as indicated below.
Fold the fabric in half to 3” x 6”.
To begin stitching, lift the front of the presser foot with your right thumb
and slide the fabric under the presser foot. Release the tip of the
presser foot and begin stitching, trimming the fold away.
Stitch to the end of the fabric. Continue stitching off the fabric until you
have a 3”- 4” thread chain. Cut thread chain.
Examine the stitch formation:
Blue: Loops should extend to the edge of the fabric,
interlocking with the red loops of the lower looper.
Red: Loops should extend to the edge of the fabric,
interlocking with the blue loops of the upper looper.
Yellow: Needle stitches should appear along the inside
edge of the stitch as straight stitches or tiny “dots”
of thread.
Green: Needle stitches should appear as a line of
straight stitching running through the middle of
the overlock stitching
See the following page for tension adjustment information. Make
any necessary tension adjustments and sew another 4-thread overlock
stitch.
Suggested Settings
L 460/L 450
Upper Looper 3-5
Lower Looper 3-5
Left Needle 3-5
Right Needle 3-5
Stitch Length 2.5
Cutting Width 6
Differential Feed 1

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Overlocker Workbook 1
Adjusting Tension Settings
Examine your 4-thread sample. The illustrations below show examples of unbalanced stitches and how
to correct the settings to balance the stitch. When making corrections in the tension settings, increase or
decrease the settings as needed, moving the dial ½ to 1 number at a time. Stitch a seam using the new
settings and then evaluate the new stitch. Continue in this manner until the stitch is balanced.
Upper and Lower Loopers - Tight Tension
Unbalanced: The looper threads “bite” into the edge of the fabric and/or the seam
allowance is folded or “scrunched” in the stitch.
Correction: Decrease (lower number) one or both looper tensions until the seam
allowance is flat and loopers meet at the edge. Note: This problem might also
result from an incorrect cutting width setting; see page 10 for more information.
Upper Looper - Loose Tension
Unbalanced: The looper threads are not at the edge of the fabric. Upper looper
thread is visible on the back of the fabric and the looper threads are very loose.
Correction: Make sure the thread is seated in the tension guides. If it is, tighten
the upper looper thread (higher number).
Lower Looper - Loose Tension
Unbalanced: The looper thread does not lock on the edge of the fabric. Lower
looper thread is visible on the face of the fabric. The looper threads are very
loose.
Correction: Make sure the thread is seated in the tension guides. If it is, tighten
the lower looper thread (higher number).
Left Needle - Loose Tension
Unbalanced: The yellow needle forms loops on the underside of the fabric. The
seam is not secure and the yellow thread may show in the seam line.
Correction: Make sure the yellow thread is seated in the tension guide. If it is,
tighten the left needle tension (higher number).
Right Needle - Loose Tension
Unbalanced: The green needle thread forms loops on the underside of the fabric.
Correction: Make sure the green thread is seated in the tension guide. If it is,
tighten the right needle tension (higher number).
Right and Left Needles - Tight Tension
Unbalanced: The green and yellow needle threads are pulled taut, causing puck-
ers in the fabric at the seam line.
Correction: Make sure the threads are seated in the tension guides or have not
double-wrapped around a threading guide. If they have, unwrap or loosen appro-
priate needle tension (lower number).

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Overlocker Workbook 1
Micro Thread Control (MTC)
Fabric: Firm fabric, 6” x 6”
Needle: 80/12 Universal
Thread: 4 cones of overlocker thread (blue, red, green, yel-
low)
Presser Foot: Standard
Divide the fabric into 4 equal sections along one side,
finger-press the folds to form creases.
Thread for a 4-thread overlock stitch using thread colors to match the
color-coded threading path on the overlocker. Adjust all thread ten-
sion settings as indicated below.
Set the MTC lever to the maximum setting, stitch on the first fold.
Move the MTC lever to the normal setting, stitch on the second fold.
Move the MTC lever to the minimum setting, stitch on the third fold.
Mark the sample:
MTC - maximum
MTC - normal
MTC - minimum
.
before MTC adjustment after MTC adjustment
Note: The MTC function is a fast and easy way to make
a stitch formation look perfect without having to adjust
multiple thread tension. Different fabrics and threads will
affect the formation of the stitch so the MTC setting may
vary from fabric to fabric.
minimumnormalmaximum
Suggested Settings
L 460/L 450
Upper Looper 3-5
Lower Looper 3-5
Left Needle 3-5
Right Needle 3-5
Stitch Length 2.5
Cutting Width 6
Differential Feed 1

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Overlocker Workbook 1
Stitch Length
Fabric: Firm fabric, 6” x 6”
Needle: 80/12 Universal
Thread: 4 cones of overlocker thread (blue, red, green, yel-
low)
Presser Foot: Standard
Fold fabric in half to 3” x 6”.
Using a fabric marker, divide the fabric into four equal sections
along the folded edge.
Thread the overlocker for a 4-thread overlock stitch using thread
colors to match the color-coded threading path on the overlocker.
Adjust all thread tension settings as indicated below.
Adjust the stitch length to 4mm. Sew to the first mark along the
folded edge, trimming the fold slightly.
Adjust the stitch length to 3mm and sew to the second mark.
Adjust the stitch length to 2mm and sew to the third mark.
Adjust the stitch length to 1mm and sew to the end.
Mark the stitch length settings on the fabric sample.
Return stitch length to its normal setting, 2.5mm.
4mm
3mm
2mm
1mm
Stitch length adjustments may be needed to accommodate
thicker or thinner threads or different weights of fabric.
General guidelines for stitch length settings:
1-1.5mm: rolled hems and decorative edges
2-2.5mm: seaming and general overlocking
3-4mm: certain techniques such as gathering
and applying elastic
Suggested Settings
L 460/L 450
Upper Looper 3-5
Lower Looper 3-5
Left Needle 3-5
Right Needle 3-5
Stitch Length varies
Cutting Width 6
Differential Feed 1

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Overlocker Workbook 1
Cutting Width
Fabric: Firm fabric, 6” x 6”
Needle: 80/12 Universal
Thread: 4 cones of overlocker thread (blue, red, green, yel-
low)
Presser Foot: Standard
Fold the fabric in half to 3” x 6”.
Divide and mark the fabric into three equal sections along the fold-
ed edge.
Thread the overlocker for a 4-thread overlock stitch using thread
colors to match the color-coded threading path on the overlocker.
Adjust all thread tension settings as indicated below.
Rotate the upper knife up. Adjust cutting width to the widest
setting. Rotate the upper knife down into cutting position.
On the L 460 and L 450, the cutting width can be adjusted without
moving the knife.
Sew to the first mark on the fabric, stopping when the knife
edge is on the mark.
Adjust cutting width to a mid-range setting and overlock to the
second mark.
Adjust the cutting width to the lowest setting and overlock to the
end of the fabric.
Mark the cutting width settings on the sample.
Return the cutting width to its normal setting.
High (wide)
Low (narrow)
Mid
Suggested Settings
L 460/L 450
Upper Looper 3-5
Lower Looper 3-5
Left Needle 3-5
Right Needle 3-5
Stitch Length varies
Cutting Width 6
Differential Feed 1

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Overlocker Workbook 1
Differential Feed: Stretchy Fabrics
Fabric: Knit ribbing, three pieces, 3” x 6” each
Needle: 80/12 Universal (ballpoint may be used if needed)
Thread: 4 cones of overlocker thread (blue, red, green, yel-
low)
Presser Foot: Standard
Thread the overlocker for a 4-thread overlock stitch using
thread colors to match the color-coded threading path
on the overlocker. Adjust all thread tension settings as
indicated below.
With differential set at N, overlock two of the ribbing
pieces together along one 6” edge. If the fabric is
stretchy enough you will have a wavy or stretched
seam.
Adjust the differential to 2.0. Serge the remaining
ribbing to the other side of the first piece, trimming
slightly. With differential at a higher setting, the wavy
edge should be eliminated.
Mark the differential settings on the fabric sample.
Return the differential feed setting to 1.
N or 1
(normal)
2mm
Suggested Settings
L 460/L 450
Upper Looper 3-5
Lower Looper 3-5
Left Needle 3-5
Right Needle 3-5
Stitch Length 2.5
Cutting Width 6
Differential Feed 1

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Overlocker Workbook 1
Differential Feed: Soft Fabrics
Fabric: Lightweight, soft, 4” x 6”
Needle: 80/12 Universal
Thread: 4 cones of overlocker thread (blue, red, green, yel-
low)
Presser Foot: Standard
Thread the overlocker for a 4-thread overlock stitch using
thread colors to match the color-coded threading path on the
overlocker. Adjust all thread tension settings as indicated be-
low.
With differential set at N or 1, sew on one 6” edge. If fabric is
lightweight enough you will have a puckered edge.
Adjust the differential to 0.7. Sew along the other 6” edge, trim-
ming slightly. With a low differential setting, the puckered edge
should be eliminated.
Mark the differential settings on the fabric sample.
Return the differential feed setting to 1.
1 or N
(normal)
0.7mm
Suggested Settings
L 460/L 450
Upper Looper 3-5
Lower Looper 3-5
Left Needle 3-5
Right Needle 3-5
Stitch Length 2.5
Cutting Width 6
Differential Feed 1

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Overlocker Workbook 1
Differential Feed: Gathering
Fabric: Lightweight fabric, 6” x 12”
Needle: 80/12 Universal
Thread: 4 cones of overlocker thread (blue, red, green, yel-
low)
Presser Foot: Standard
Using a fabric marker divide the fabric into 3 equal sections
along one 12” side.
Thread the overlocker for a 4-thread overlock stitch using
thread colors to match the color-coded threading path on the
overlocker. Adjust all thread tension settings as indicated be-
low.
Turn the differential feed dial to 2. Sew to the first mark.
Adjust stitch length to 4mm and sew to the second mark.
Move the thread tension dials up to 8 to increase both
needle thread tensions. Sew to the end of the fabric.
Return the differential feed to 1. Set the stitch length to 2.5.
Move the thread tension dials to return tensions to normal
settings.
Suggested Settings
L 460/L 450
Upper Looper 3-5
Lower Looper 3-5
Left Needle 3-5
Right Needle 3-5
Stitch Length varies
Cutting Width 6
Differential Feed varies

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Overlocker Workbook 1
Securing Seams
Fabric: Firm fabric, 6” x 6”
Needle: 80/12 Universal
Thread: 4 cones of overlocker thread (blue, red, green, yel-
low) Presser Foot: Standard
Stitch: 4-thread overlock
Thread the overlocker for a 4-thread overlock stitch using thread
colors to match the color-coded threading path on the overlocker.
Adjust all thread tension settings as indicated below.
Stitch a 2”-3” thread chain without fabric.
Fold fabric in half to 3” x “6” and place under the presser foot.
Take 2-3 stitches on the fabric. Lower the needles into the fabric.
Raise the presser foot and with your left hand gently pull the thread
chain around the needles to the knife.
Lower the presser foot and continue stitching (cutting off the excess
thread chain) until you are one stitch off the end of the fabric.
Locate the Stitch Selection Lever on the right side of the cloth plate;
pull it toward you, releasing the thread chain from the stitch tongue.
Raise the presser foot and carefully flip the fabric over so that
the lower looper side of the previously stitched seam will be
overstitched.
Place the fabric under the presser foot so that the first stitch will
enter the fabric when you begin stitching.
Slide the Stitch Selection Lever toward the body of the overlocker.
Stitch for about 1”, overstitching the previous stitching. Guide the
fabric so as not to cut the previous stitching. Optional: Rotate upper
knife up to deactivate.
Raise the toe of the presser foot and rotate the fabric 90° clockwise.
Stitch off the edge of the fabric.
If the upper knife is up, rotate it down into the cutting position.
Suggested Settings
L 460/L 450
Upper Looper 3-5
Lower Looper 3-5
Left Needle 3-5
Right Needle 3-5
Stitch Length 2.5
Cutting Width 6
Differential Feed 1

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Overlocker Workbook 1
Presser Foot Tape Guide
Fabric: Two pieces cotton interlock fabric, 3” x 6” each and
Narrow twill tape, 8”
Needle: 80/12 Universal
Thread: 4 cones of overlocker thread (blue, red, green, yel-
low)
Presser Foot: Standard
Thread the overlocker for a 4-thread overlock stitch using thread col-
ors to match the color-coded threading path on the overlocker. Ad-
just all thread tension settings as indicated below.
Locate the tape guide on the presser foot.
Using the small screwdriver from the accessory pouch, loosen the
fixing screw and slide the tape guide all the way to the left. Snug
the screw.
Slip the twill tape or ribbon into the slot on the presser foot and
position it under the foot, pulling it to the back.
Lower the presser foot and lower the needles into the tape or ribbon.
Loosen the fixing screw and adjust the tape guide to the width of the
tape or ribbon. Retighten the screw.
Place the fabric pieces right sides together. Slip the fabric under the
foot and seam along the 6” side, catching the tape or ribbon in the
stitched edge.
Remove the fabric from under the presser foot and examine the
seam. It will not stretch; the tape or ribbon has stabilized the seam.
fixing screw
Suggested Settings
L 460/L 450
Upper Looper 3-5
Lower Looper 3-5
Left Needle 3-5
Right Needle 3-5
Stitch Length 2.5
Cutting Width 6
Differential Feed 1

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Overlocker Workbook 1
3-Thread Overlock Stitch
Fabric: Firm fabric, 8” x 6”
Needle: 80/12 Universal
Thread: 3 cones of overlocker thread (red, blue, green for
narrow and red, blue, yellow for wide)
Presser Foot: Standard
Stitch: 3-thread overlock (wide)
Wide Balanced Stitch
Using the small screwdriver and brush/needle insertion tool,
remove the right needle. Snug the needle set screw after
removing the needle.
Thread the overlocker for a wide 3-thread overlock stitch using
the left needle and thread colors to match the color-coded
threading path on the overlocker. Adjust all thread tension settings
for a balanced stitch as indicated below.
Fold fabric in half to be 4”x 6”. Stitch along the folded edge of
the fabric, trimming slightly to remove the fold.
Narrow Balanced Stitch
Using the small screwdriver and needle insertion tool, loosen the
right needle screw and insert the right needle.
Hint: Place the point of the needle directly above the right
needle space of the presser foot, then lift the needle up to
place the shank in the correct hole. Tighten the right needle
screw.
Remove the left needle. Snug the needle set screw after
removing the left needle.
Thread the overlocker for a 3-thread narrow stitch using the right
needle and thread colors to match the color-coded threading
path on the overlocker. Adjust all thread tension settings for a
balanced stitch as indicated below.
Stitch along the raw edges opposite the wide balanced stitch.
Suggested Settings
L 460/L 450
Upper Looper 3-5
Lower Looper 3-5
Left Needle 3-5
Right Needle 3-5
Stitch Length 2.5
Cutting Width 6
Differential Feed 1

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Overlocker Workbook 1
Inside Corner
Fabric: Firm fabric, 6” x 6”
Needle: 80/12 Universal
Thread: 3 cones of overlocker thread (blue, red, green)
Presser Foot: Standard
Stitch: 3-thread overlock (narrow)
Using the small screwdriver and brush/needle insertion tool, remove
the left needle. Snug the needle set screw after removing the needle.
Thread the overlocker for a narrow 3-thread overlock stitch using
thread colors to match the color-coded threading path on the overlock-
er. Adjust all thread tension settings for a balanced stitch as indicated
below.
Inside Corner
This technique works well for continuous plackets on sleeves and
back neck openings.
• Cut an inside corner into the fabric.
• Snip into the corner about ¼” (the width of the stitching).
• Stitch until the knife reaches the end of the cut.
• Use the handwheel to lower the needle into the fabric.
• Lift the presser foot and straighten the corner towards you.
• Lower the presser foot; continue stitching.
.
Suggested Settings
L 460/L 450
Upper Looper 3-5
Lower Looper 3-5
Left Needle 3-5
Right Needle 3-5
Stitch Length 2.5
Cutting Width 6
Differential Feed 1

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Overlocker Workbook 1
Outside Corner
Fabric: Firm fabric, 6” x 6”
Needle: 80/12 Universal
Thread: 3 cones of overlocker thread (blue, red, green)
Presser Foot: Standard
Stitch: 3-thread overlock (narrow)
Using the small screwdriver and needle insertion tool, remove the left
needle. Snug the needle set screw after removing the needle.
Thread the overlocker for a narrow 3-thread overlock stitch using
thread colors to match the color-coded threading path on the overlock-
er. Adjust all thread tension settings for a balanced stitch as indicated
below.
Outside Corner
OPTION 1
• Stitch one edge of the fabric, stitching off the end of the
fabric. Trim the thread tail.
• Continue stitching around the square, crossing over previous
stitching.
• Use a seam sealant on the untrimmed thread tails (or use a
tapestry needle to weave the thread tail back through the
stitching). When the seam sealant is dry, trim the thread tails.
OPTION 2
• Before stitching, trim away the seam allowance (¼”) for about 2”
on each corner of the square.
• Beginning at one trimmed corner, stitch (trimming very slightly
as you sew) to the end of the fabric. Take one stitch off the end
of the fabric.
• Locate the Stitch Selection
Lever on the stitch plate
and pull it toward you.
This will free the thread
from the stitch tongue.
• Lift the presser foot and
carefully pivot the fabric
90° clockwise.
• Return the Stitch Selection
Lever to normal (away from
you).
• Place the needle one stitch
into the fabric and lower the
presser foot.
• Continue stitching until you
are one stitch off the next
corner.
• Repeat the turning proce-
dure and continue stitching.
trimmed
corner
untrimmed
corner
Suggested Settings
L 460/L 450
Upper Looper 3-5
Lower Looper 3-5
Left Needle 3-5
Right Needle 3-5
Stitch Length 2.5
Cutting Width 6
Differential Feed 1

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Overlocker Workbook 1
3-Thread Rolled Hem
Fabric: Medium weight fabric, 4” x 6”
Needle: 80/12 Universal
Thread: 3 cones of overlocker thread (blue, red, green)
Optional: Woolly Nylon thread for upper looper
Presser Foot: Standard
Stitch: 3-thread rolled hem
Using the small screwdriver and brush/needle insertion tool,
remove the left needle. Snug the needle set screw after
removing the needle.
Thread the overlocker for a narrow 3-thread overlock stitch using
the right needle and thread colors to match the color-coded
threading path on the overlocker. Adjust all thread tension set-
tings for a rolled edge as indicated below.
Pull the Rolled Hem/Stitch Selection Lever toward you.
Place the fabric under the presser foot and sew along one 6”
edge.
Return stitch length and thread tension dials to normal.
Return the Rolled Hem/Stitch Selection Lever to normal sewing
position.
Optional: Thread the overlocker for a 3-thread rolled hem (right
needle) with Woolly Nylon in the upper looper. Adjust all thread
tension settings as indicated below and overlock the edge oppo-
site of the previously stitched rolled edge.
The Rolled Hem Selection
Lever moves the stitch fin-
ger in and out of position.
Push the lever forward for
normal serging so the stitch
can form over it, keeping
the fabric flat (upper ill.).
Pull the lever back so the
fabric edge can roll as when
stitching a rolled edge
(lower ill.).
Suggested Settings
Others L 460/L 450
Upper Looper 3-53-5
Lower Looper 7-97-8
Left Needle N/A N/A
Right Needle 3-53.5
Stitch Length 1-1.5 1-1.5
Cutting Width 2-35
Differential Feed N1

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Overlocker Workbook 1
3-Thread Flatlock
Fabric: Firm fabric, 6” x 6”
Needle: 80/12 Universal
Thread: 3 cones of overlocker thread (blue, red, yellow)
Presser Foot: Standard
Stitch: 3-thread flatlock (wide)
Using the small screwdriver and brush/needle insertion tool,
remove the right needle. Snug the needle set screw after
removing the needle.
Thread overlocker for a wide 3-thread flatlock. Adjust all thread
tension settings as indicated below. Note: Sample was stitched
with regular thread but a heavy thread such as YLI Jeans Stitch
or Designer 6 can be used in the looper for a more decorative
look. When working with heavy decorative threads, loosen the
upper looper tension and lengthen the stitch length as needed
for the desired look.
Fold the fabric in half, wrong sides together, to 3” x 6”.
Optional: Attach the Right Seam Guide to the overlocker (700D
and 800DL will require the Attachment Base). Move the Right
Seam Guide halfway between the needle and the stitch finger.
Place the fold under the presser foot. Guide the fabric halfway
Between the left needle and the right edge of the stitch finger
(or against the Right Seam Guide).
Slowly stitch the fabric. The looper threads will extend beyond the
fabric on the right side of fold. Decorative Thread Tip: To avoid
uneven stitches, tangled threads, hiccups, and other imperfec-
tions, always overlock slowly when working with decorative
threads.
Gently pull the fabric flat.
Return stitch length
and thread tension
levers to their normal
settings.
Optional: For a narrow
flatlock stitch, reset the
overlocker using the right
needle
The needle side of the
stitch is called a ladder
stitch and can be used
as the decorative side
if desired.
3-thread flatlock with Designer 6
thread in the upper looper
Suggested Settings
Others L 460/L 450
Upper Looper 3-53-4
Lower Looper 7-97-8
Left Needle 1-21-2
Right Needle N/A N/A
Stitch Length 2.5 2.5
Cutting Width 36.5
Differential Feed N1

20
05/14/2020
BERNINA
Overlocker Workbook 1
2-Thread Rolled Hem
Fabric: Medium weight fabric, 4” x 6”
Needle: 80/12 Universal
Thread: 2 cones of overlocker thread (red, green)
Presser Foot: Standard
Stitch: 2-thread rolled hem
Accessory: Upper Looper Converter
Using the small screwdriver and brush/needle insertion tool,
remove the left needle. Snug the needle set screw after
removing the needle.
Attach the Upper Looper Converter to the upper looper
Thread the overlocker for a 2-thread flatlock stitch using thread
colors to match the color-coded threading path on the overlock-
er.
Adjust all thread tension settings for a balanced stitch as
indicated below.
Pull the Rolled Hem Selection Lever toward you.
Place the fabric under the presser foot and stitch along one 6”
edge, trimming about 1/8” from the raw edge.
Return stitch length and thread tension levers to normal.
Return the Rolled Hem Selection Lever to normal serging posi-
tion.
Suggested Settings
L 460/L 450
Upper Looper converter
Lower Looper 4
Left Needle N/A
Right Needle 4
Stitch Length 2.5
Cutting Width 5
Differential Feed 1
Upper Looper Converter