Separate 45k21 from table + spare part question

[Constabulary]

The Singer 45K jump foot system foot cannot be added to machines w/o jump foot. Well, maybe - if you have enough milling machinery and so forth, money, time and patience.

Quick try for an explanation: The 45K jump foot is controlled by a notch on the cam that also controls the thread lever the 45K21 (afaik) does not have this notch so you have to to pull the top shaft to replace the cam or the whole shaft . There is a piston (kind of) sitting in the top side of the casting and the notch is pushing up the piston at the moment the foot is at its rear position then the foot releases and is jumping to the front. The 45K58 has a flat top on the casting head where the piston is mounted whereas the 45K21 doe not have this flat top. Then the 45K58 has a leaf spring on the rear (just like the Singer 29K4 f.i.) and that requires a special mounting which the 45K21 machines do not have. Not speaking of possible the differences in the casting on the rear side to accommodate the moving foot bar and differences in the face plate.... This is just what comes to my mind...

BTW

The check spring indeed is broke or missing. College Sewing in the UK has them:

https://www.college-sewing.co.uk/parts-by-machine/singer-sewing-machine-parts/singer-45k-parts

You either need just the inner part with the thread loop or both parts.

 

Edited March 19, 2023 by Constabulary

[Redbeeerd]

4 hours ago, Constabulary said:

The Singer 45K jump foot system foot cannot be added to machines w/o jump foot. Well, maybe - if you have enough milling machinery and so forth, money, time and patience.

Quick try for an explanation: The 45K jump foot is controlled by a notch on the cam that also controls the thread lever the 45K21 (afaik) does not have this notch so you have to to pull the top shaft to replace the cam or the whole shaft . There is a piston (kind of) sitting in the top side of the casting and the notch is pushing up the piston at the moment the foot is at its rear position then the foot releases and is jumping to the front. The 45K58 has a flat top on the casting head where the piston is mounted whereas the 45K21 doe not have this flat top. Then the 45K58 has a leaf spring on the rear (just like the Singer 29K4 f.i.) and that requires a special mounting which the 45K21 machines do not have. Not speaking of possible the differences in the casting on the rear side to accommodate the moving foot bar and differences in the face plate.... This is just what comes to my mind...

BTW

The check spring indeed is broke or missing. College Sewing in the UK has them:

https://www.college-sewing.co.uk/parts-by-machine/singer-sewing-machine-parts/singer-45k-parts

You either need just the inner part with the thread loop or both parts.

 

Have you ever written, or considered writing, a book? I bet the sales on this forum alone would cover the printing costs 

I actually do have 5 years work experience when it comes to milling and metal work in general. At the moment I don't have access to a workshop but it is in the works. If it's a matter of making or modifying parts, and if the cast iron casing allows for it, it will be a fun project.

Edited March 19, 2023 by Redbeeerd