Brother rh-918a manual Adjusting the thread tension, Reference values, Upper thread tension

7. SEWING

7-3. Adjusting the thread tension

Turn off the power.

Never adjust the thread tension while sewing.

<Reference values>

	Woolen materials + wool gimps	Denim (3 layers)
Upper thread tension	0.9 N	1.0 N
Lower thread tension	0.3 N	0.8 N
Thread take-up spring tension	0.05 N	0.07N
Thread take-up spring stroke	8 mm	8 mm
Upper and lower thread	# 30 polyester	# 30 cotton

* If you change the type of material being used, it may be necessary to change the thread tension.

The upper thread tension given above is the tension when the upper thread is pulled out from the thread path hole of the thread take-up lever, and the lower thread tension is when the lower thread is pulled out from the needle hole in the throat plate.

Upper thread tension Lower thread tension

3059Q

Turn the upper thread tension adjustment knob (1) in the direction indicated by the arrow to increase the upper thread tension.

3060Q

Turn the lower thread tension adjustment knob (2) in the direction indicated by the arrow to increase the lower thread tension.

Adjusting the lower thread take-up spring tension and stroke

Tension adjustment

Loosen the screw (3) and turn the thread take-up spring support (4) in the direction indicated by the arrow to increase the tension of the spring (5).

Stroke adjustment

Loosen the screw (6) and turn the thread take-up spring guide (7) in the direction indicated by the arrow to increase the stroke of the spring (5).

3061Q

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RH-981A