Needle Cuts Holes In Garments; Stitches Do Not Form - Brother BES-100E Workbook

Cause
Stitch length too short
Stitching over stitching
Improper threading
Burrs in the needle's eye,
thread guides, throat plate
or hook
Lack of lubrication in hook
assembly
Needle size too small for
thread
Too many stitches in a
small area or densities are
too heavy
Improper tensions

Needle cuts holes in garments

Cause
Dull needle
Wrong needle point type
Needle too large
Delicate fabric

Stitches do not form

Cause
Empty bobbin
Incorrect timing
Machine retaining finger in
the wrong position
Incorrect needle position
Broken hook point
110
Slowing the machine down helps sometimes. Best bet is to have the design re-
punched with longer stitches.
Reduce the density of the underlay. Try to avoid more than two layers of thread.
Re-thread the machine, making sure thread goes through all the guides in the
proper order.
Replace the needle. Use fine-grade emery cloth or emery cord to buff the thread
guides and throat plate. Buffing the hook may alter the timing; a damaged hook
should be replaced.
The hook needs frequent lubrication because it dries out faster. Using a hypo-
dermic oiler, put one drop of oil in the hook assembly track every four to eight
hours of machine use.
Change to a larger needle or a thinner thread.
Increase the design size by 5% to 10% to allow more room for stitches to lay
down, decrease density, or remove extra stitches using your machine functions,
have the design re-punched or use a thinner thread to prevent thread build-up.
Loose tensions cause thread to pile up and loop. Tight tensions cause pulling,
puckering and thread stress. Using machine manufacturer's guidelines, adjust
tensions to achieve a smooth, flat look.
Replace needle. Dull needles have a difficult time getting through the garment,
causing some fabrics to tear.
Sharp and round point needles can cut some delicate knits. Try a ball point nee-
dle.
Large needles can stretch fibers excessively, causing them to burst or become
distorted. Use the smallest needle size that is still acceptable for the thread size
you are using.
The simple penetration of the needle will cut some delicate fabrics. Soften the
impact by using a topping.
Replace bobbin.
The bobbin hook is not catching the loop. Reset timing.
The retaining finger under the needle plate holds the bobbin case in place. If this
is not in the correct position, a loop will not form. Adjust according to your
machine manual.
Note: This part usually does not "wiggle" out of position on its own. Wrong posi-
tioning may occur after work has been done in the hook assembly/bobbin area,
for example after timing the hook.
Re-insert the needle. If needle is not pushed all the way into the needle bar
shaft or not rotated properly, the effect is the same as if the timing were off.
Replace rotary hook assembly.
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