Timing is the relationship between the hook point and the needle eye on three planes; (X) how soon, (Y) how close and (Z) how high. Anything that changes the relationship between these two components changes the timing of the machine.
How might the machine user inadvertently change their machine timing?
- By not inserting the needle all the way into the needle clamp; this changes the “how high” position of the needle eye to the hook point.
- By not inserting the needle correctly with the long groove down the front and the scarf at the back; this changes the “how soon” position of the needle eye to the hook point.
- Moving the machine too quickly or erratically; this deflects the needle and changes the “how soon” and/or “how close” position of the needle eye to the hook point.
- Adjusting tensions too tight, balanced on top and bottom but too tight; the thread pulling too hard through the top tension device changes the “how soon” and/or “how close” position of the needle eye to the hook point.
All of these can happen to change the timing without the mechanical timing adjustment of the machine being thrown out at all. Mechanical timing adjustment usually goes out or slips when there is an ugly event such as breaking a needle, running over a ruler, or a massive thread lock.
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