Joe,
It's really rare for these old straight stitch machines to go out of hook timing. They usually had a roll pin placed instead of a set screw when the factory set the timing, making it darn near impossible for the timing to go out.
Frequently the needlebar height is the issue. Needlebar height
always has to be set before
the hook is timed, so start there. This is the way I check. Turn the machine’s handwheel in the normal direction until the point of the needle reaches “dead bottom center”. DBC is where the needle is at it’s lowest point. Starting there turn the handwheel until the needle has risen exactly .093 inches. The point of the needle should now be directly behind the needle in the middle of the scarf (dip in the needle just above the eye). If not, where is the point? If the needle has risen .093” and the hook point is not behind the needle then the timing may be off. If it is behind the needle, but not in the scarf then the needlebar height is off.
Always start with a new needle and make sure it is not a stretch needle.
You said that the thread jams. Which thread, needle or bobbin? Check both tensions. Make sure the presserbar is down (easy to forget).
Cathy
Originally Posted by
J Miller
This might be a bit involved but here goes:
I have an Edison HA-1 15 Clone. Nice looking machine but it's got problems.
I found the first clue in a bunch of bent and broken needles in the case.
I found:
The feed dogs out of adjustment, the were too far forward and impacting on the needle plate.
The presser foot was adjusted too high
The needle bar was adjusted too low
The needle bar and presser foot was hitting each other.
I adjusted the feed dogs, the presser foot shaft and needle bar using the info in the 15-91 service manual I was referred to. (The 15-91 books are not as close to the clones as I'd want them. There are many differences. )
However now it thread jams horribly. So I checked the hook to needle timing as best as I can and find the hook a bit advanced of the needle. Instead of being centered at the needle at the eye, it's maybe an 1/8" past it.
There is another potential problem I'll be checking on later today, but in the mean time, any body have any suggestions from hands on experience, or links to service manuals other than the Singer manuals????
Joe