typical GC6-6, Instruction Book

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4. Operation
4.1. Selection of thread
Needle thread should be left-twisted. Thread. For
bobbin thread, either left or right twisted thread is
available.
To identify the twist direction of the thread, hold
the thread as shown in Fig.13, twist the thread by
right hand in the direction of arrow. If the strand
turn to be tight,the thread is the left-twisted, otherwise
the thread is right- twisted thread .
NeedleSize
#18
#19
#21~#22
4.2 Coordination between needle, thread and
sewing materia
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Needle of machine Model GC6-6 is Dp 17,
#18-#22
Needle of machine Model GC6-7 is Dp 17,
#18-#22
Selection to the needle size should be based upon
the thread and material to be sewn.
The following table is for reference
Kind and number of thread
Cotton thread #30-#40
Linen thread #60-#80
Polyester thread #20-#40
linen thread #40-#60
glazed thread #40-#60
mercerized thread#21-#60
Material to be sewn
clothes, canvas heavy wool
heather cloth, shoes, cap, hand bag
Heavy fabric,
leather goods,
sofa, suitcase, bag,
tarpaulin, cushion
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3.2.4 Trial run
Trial run is required for a new sewing machine,
or when the machine left out operation for
considerable length of time is used again.
Before the trial run , lift presser foot first, the
balance wheel must be rotated in correct direction
as mentioned in 3.1.6,3 ). Run the machine begin
at a low speed, as the machine runs well then
increasing the speed gradually and up to 2000spm,
after a few minutes to stop the machine for examina-
tion. As the machine is run sufficiently well then
put it into operation
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