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Posted by robb on July 7, 2008, 2:29 pm
> What is factory recomended lower thread tension for Singer
Inspiration 4210
> sewing machine?
> Taping the end of the thread to the edge of digital kitchen
scale plate and
> pulling bobbin case verticaly down, I can measure bobbin thread
tension
> quite accurately!
> Actual value of thread tension is 27 grams.
> What is reccomended value of bobbin tension for my machine?
> Is "drop tension test" valid for machines with light, plastic
bobbin cases,
> like Singer Inspiration 4210?
>
> Kind regards!
> Tadeusz
>
does the manual not give any instruction ?
my somewhat educated guess is possibly... if the upper tension
gauge was calibrated to match a drop case tension with your
plastic bobbin case. I suppose you could test the "bobbin case
drop tension theory" easily enough by setting the bobbin case
tension by that drop method, then load up the machine with same
thread loaded on the bobbin and then put a 80/12 universal
needle (a middle range needle) in the machine and sew two layers
of a medium weight fabric with straight stitch (SS). Adjust the
the upper tension knob until you get balanced stitches.
Then the question is, what is the upper tension setting required
to balance the stitches ? is it close to the middle range of
the upper tension setting values ? Is the upper tension value
near some pre-defined default value on the upper tension knob ?
( ie. some of my machines have a reccomended start upper tension
setting for SS at 3 out of (0-9) some of my machines have no
such reccomended start tension and then others have ranges )
if the upper tension value is close to some expected or
desireable value then the drop test probably works for your
machine.
It would be interesting to know what the weight of your plastic
bobbin case is with a full bobbin and how close it is to the 27
grams ? I wish i could tell you the weight of a metal bobbin case
?
NOTE/aside ....
the tension test method elaborated above is one way i have
calibrated bobbin case tension on some of my machines for my
personal usage needs. I can't remember who/where/how this method
came to me but if you do not get any definitive answers on the
**default** bobbin tension setting for your machine, you can use
that tension setting method as a way to calibrate your **bobbin
case** tension to **your needs**.
So.... that would mean
> loading bobbin with whatever thread you use most often ,
> load the machine with the same,
> use whatever needle you typically use
> set your upper tension value to some prefered setting
(low/mid/high)
there are a variety of personal calibration strategies you
could use here. I use mid-range or slightly below mid-range of
what i typically sew.
> then SS sew 2 layers of a fabric you most often use
> then adjust bobbin tension until you get a balanced stitch.
now the **bobbin case** would be calibrated to your usage or
need
Or maybe i will get skewered or flamed by (alt.sewing) for
suggesting such a scheme :)
hth
robb
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