How to Adjust Sewing Machine Hook Timing
The hook timing is the main parameter of correctly working of sewing machine. The hook timing is main cause of defects of stitching, such as skipping stitches. To avoid such defects and good creating a stitch requires exact sewing machine timing.
Here you will find the tips on how to adjust sewing machine hook timing.
If you think your sewing machine have a timing problem remove the presser foot first.
Next, remove the needle plate.
Disassemble the shuttle mechanism.
It is not necessary to unscrew the screws of feed dogs and remove it. I did it so that you could see better how to adjust the sewing machine timing.
All details needs to laid neatly in one place, so as not to loose anything.
How interacts the needle with the hook
The needle and tip of hook have extreme positions. The needle has bottommost position.
The tip of hook has leftmost position.
The needle bottommost position have any types od sewing machines including overlock sewing machine.
The sewing machines having vertical oscillating shuttle hook system have the hook leftmost position.
The sewing machines having rotary shuttle hook system do not have an extreme left position of hook tip.
If you have old sewing machine having vertical oscillating shuttle hook system you need start the adjustment sewing machine timing from the check the needle and hook extreme positions.
Sewing machine timing parameters
Switch the sewing machine to the straight line.
Turn the balance wheel by hand and set the tip of the hook close to the needle, as show.
If the distance from the top edge of the eyelet of the needle to the tip of the hook is within these limits, then you do not need to do anything.
You should know that the sewing machines performing the stitching zigzag need to be adjusted in three needle positions.
So set the zigzag line to the widest position and make a left "prick".
Check the distance from the needle eyelet to the tip of the hook. It must be greater than in the center position of the needle (straight line).
Now set the needle in the right position of zigzag stitch. The tip of the hook should be slide above the eye of the needle.
The distance is less than in the center position of the needle, but it must be at least 1 mm.
Distance between hook and needle planes
This distance between hook and needle planes is last parameter of adjustment of sewing machine timing.
The distance should be minimal. But in any case, the tip of the shuttle should not strike the needle. Otherwise, the needles will bend and the shuttle hook will be blunt.
Needle and shuttle hook adjustment screws
Needle bar has adjustment screw. If you unscrew it, the needle bar can be moved up or down.
To find this screw you need to remove the front cover of sewing machine.
To adjust the position of the hook, it is necessary to disassemble the body of the sewing machine.
On this photo with the arrows indicates the screws holding the gears of the shuttle hook.
Do not sew rough fabrics and materials on a home sewing machine, such as jeans or natural leather. Many sewing machines have plastic gears and their teeth can be damaged.
English isn't my first language, so please excuse any mistakes and help correct them.
E-mail for sending is on the contact page.
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