Singer class 172

[ddiuni]

Could you please tell me the diameter and length of the handle screw on the stitch adjustment handle?

 

regulating handle thumb screw #ss714

 

Edited September 26, 2023 by ddiuni

[ddiuni]

Esther B, are you good at controlling your touch?
If you tighten it with the thumb screw, does it stay locked?
After tightening it with a thumb screw, I just rotate the pulley and it turns.

  If the stitch spacing of the Regulating Handle is set to 5 or 6, the touch control button will be fixed without moving.
however
Symptoms include:
From stitch number 8 to 25, it just quickly returns to the 25th stitch as if the elasticity decreases. (When the spring is pulled, it returns to the 25th position with some elasticity, like returning to the original length.)

So, it is controlled with the thumb screw of the regulating handle.
When I set the stitch to position 12 and turn it with a thumb screw to secure it, it doesn't seem to be fully fixed. So, when I rotate the sewing machine's pulley, the Regulating Handle is not fixed and the problem occurs that the stitch interval moves toward the longer side.

So I loosened the thumb screw,
I confirmed that the inner diameter of the circular ring inserted into the thumb screw was large and moved back and forth.
So it seemed like it couldn't be fixed accurately.
So, I replaced the circular ring with a coin-sized circular ring and fixed it.
When fixing it, I turned it with a screwdriver and tightened it tightly.
(Originally, the thumb screw of the 172k sewing machine did not have a straight slot for the driver. However, a slot has been created.
Perhaps the Regulating Handle was not fixed well at some point and the existing user created a straight groove. )

In short
Problem 1. Regulating Handle #106046 Parts cannot be adjusted.
-> Existing user solution: Make a straight groove in the handle and fix it.

Problems occur even after doing the above
Problem 2. A problem occurs where the inner diameter of the circular ring inserted into the groove of the screw (#ss714 part thumb screw) of the regulating handle does not match the thread groove of the thumb screw.
- So, when turning the Regulating Handle, a problem occurs where the circular ring inserted into the thumb screw is not centered and is shifted to one side -> As a result, a problem occurs where the Regulating Handle cannot be fixed.

-> Problem 2 solution: Change the circular ring to the size of a coin.
    -> Result after changing the circular loop: First, it is properly fixed and sewn at the desired stitch interval.

# There may be cases where it doesn't work again in the future, but we will wait and see.

Same thing, what about the 172k1 you have? Is it well controlled?
I'd like to hear your opinion.

[ddiuni]

On 2023. 9. 8. at 오후 7시 41분, Gump said:

제가 측정한 싱어 나사는 모두 표준 [SAE] 미세 나사산으로, 찾기 어렵지만 대부분의 최신 선반에서 사용할 수 있습니다.

thank you
I bought it from AliExpress, cut the edges, reduced the inner diameter, and installed it. Also, the groove was not in the right position, so I used a drill to widen the groove a little and installed the needle set screw.
I'm glad I was able to solve this problem without any parts.

[EstherB]

Hi! Apologies, I wasn't logged in for ages...

I don't have the machine anymore, shortly after I opened this link, a member of this forum got in touch and bought the machine from me...

Sorry about that.

I never used the machine, I bought it from an antique shop because I found it interesting and needed the table for another machine...