Question about Sewing Machines
If the timing is "out", you will not be able to form the chain stitch.......do a sample to see that you have all 4 or 3 threads involved in forming a complete stitch.........if you do, then it is not timing.
I suspect there is a likely collision of parts, there are several possible contenders, tolerances for most are very small, 0 - 0.2mm, so a very good light and magnifying glass are useful, as is good hearing for when the click or clunk happens....
While slowly moving the handwheel manually, rocking back and forth and/or full rotation.....remove all threads for this..., carefully observe:
> the two loopers should almost touch as they pass each other
> lower looper should almost touch the needle/s as it passes
> is lower looper needle guard colliding with either needle/s or upper looper
> are feed dogs colliding with needleplate
> are knife blades burred, check for smooth surface/s
> are loopers burred (gently run finger along looper up to & over the point, on all 4 surfaces they should be smooth & free of "lumps")
there may also be a load of lint inside the base.......if you open this, be ready with vacuum and do it over newspaper with machine on its back.......use a small brush to assist.
are your needles new and sharp
if you have sewn through pins, things can go out of balance, or get jammed inside.
Does the handwheel feel free all the way around, or is there a "tight" spot......where is everything (relative position of loopers, needle/s) when this happens, is anything obviously holding back the movement, or clicking as it passes....is it in the same place at each rotation ?
Once you have a better idea of the specific area/s of concern, post back with lots of detail and maybe a photo, and we shall have another go at specific resolution........at this stage, there are too many variables to say straight off what it is causing the noise.
Posted on Feb 29, 2008
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