Constabulary

my records say the 30-15 is a small bobbin machine and 30-17 is large bobbin.

Hope this helps: https://leatherworker.net/forum/topic/96574-singer-51w56-needle-bar-conversion/?do=findComment&comment=659864

Thats ONE story - I also have heard that they stopped making this machine before the war cause it was too complicated (too many parts) and the competitors (Adler 30, Singer 29K...) were cheaper to produce. I don´t know - maybe the truth is somewhere in the middle.

@Pharvey Hard to tell from the distance... See the large slotted screw next to the long handle? Try loosening a little bit, maybe it is too tight. Just a guess. If it does not help post some pictures from the rear and the right side of the head. It is the 1st Class 17 I have been working on but I managed that it is making quite long stitches - longer than 5 SPI actually.

I meant 29K72 But as WIZ said, post a picture of the shuttle to be sure it is a large hook machine. I could be "downgraded" to 30-15 - you never know...

Basically a short Arm version of the Adler 30 - usually the short arm is named 30-15 BUT the 30-17 should have a LARGE shuttle hook but with short needle (no high lift). A rare machine but in case you need parts most parts of the Adler 30-1 and 30-7 should work with your machine. The large hook and bobbins is the same as for the Singer 29K71. The machine seems to be a quite early one cause it has no quick release for the hand wheel which allows to wind the bobbin w/o running the whole sewing mechanism.

@Stevens6 this is a manual for the 29K71 which more or less is the successor of the 29K51 - the two machines are very similar but not identical but it will work for your machine. https://leatherworker.net/forum/applications/core/interface/file/attachment.php?id=135841 Hope this helps

The springs should work!

It is a darning machine - not even a sewing machine. If it is in the state as it once left the factory it does not even have a feed dog (for feeding the material) or a stitch length adjuster so It will not produce a seam with constant stitch length at all but we have not seen your particular machine yet. Maybe someone reworked it in the past.

The above info sheet seems to be from the original 441 manufacturer JUKI The linked Sieck 441 K looks like the Cowboy CB 3200 and not like a CB 4500 Neither SIECK or COWBOY are manufacturer of sewing machines, they just put their own label (brand name) on Chinese made sewing machines and they are free to give them a name of their own choice. The price on the SIECK website is w/o VAT - add 19% for German VAT.

obviously a 227R - maybe from a different batch. Also check SEIKO CW-8 or Consew 227R - basically all the same machines.

Maybe the racks & pinions in the gear box are worn or maybe the hook tip is worn. Are you sure you are using the right needle system 332 LONG (not 332)? Make sure the long grove of the needle is facing left.

some years ago I visited their factory and bought some smaller spares while I was in the area for picking up some machinery (for sewing & wood working IIRC) - very nice folks there indeed!

Maybe worth checking with Global Sewing Machines and see what they have. They are NL based (Haarlem) and also have used 441 machines as it seems: https://globalsew.com/product/juki-tsh-411-normal-new/ Or maybe SIECK in Germany: http://www.sieck.de/en/machines/sewing/saddlery-sail-maker-heavy-duty-materials/arm-type-machines/?produkt=6832 EDIT: Looks like the Global Juki 441 are just drop feed - anyway - maybe worth checking with them.

College Sewing or Trojan Sewing in the UK are quite good sources for parts for certain Chinese / Japanese / Taiwanese made machines. But since BREXIT importing things from the UK became more expensive.

No Singer serial number IMO - I´d say Consew 226 or Seiko STW-8B

Can´t find my digital caliper but yes, the 45K needle bar is ~0.9-1mm wider so a drill press will help

IIRC the 45K and 132K foot bars have a slightly larger diameter but I can check that later today. Anyway - if you have a drill press you probably make the adapter work. If the standard Singer feet will then work with the 45K / 132K is another story. You for sure have to modify the feet as well f.i. to allow the use of larger diameter needles. Keep in mind the standard feet are rather narrow and the feed dog on the 45K / 132K are rather wide. So the foot thing is trial and error IMO but the adapter it self can be modified I´d say.

Question is why do you want to adjust the foot height? I never do that on drop feed machines. I once set my foot bar top the max. foot lift and then I´m done. I only adjust the foot pressure. But maybe I do not understand your problem with the foot height. Maybe you mix up something. You can adjust the walking foot height on triple feed (aka walking foot) machines related to the material thickness. But on plain drop feed machine (like 45K25 and 31-15) there usually is no need to do that.

System 81 also is LA X 81 https://www.frankfordleather.com/needles/groz-beckert-claes-81-needle.asp Or check https://www.shoesystemsplus.com

w/o knowing what is worn we only can guess. I love the old 45K´s very much but to be honest they had their time and better machines are out there nowadays. Not saying they are useless but it depends on the job and the money you can spend. I´m still using my 45D91 and I`m still pleased with it and I do not have the output that would justify a CB3500 or even CB4500 . What are you sewing with your machine? However they still make clones of the 45K - its the GA5-1 / Cowboy CB105 / Cowboy CB2500 and it is well possible that some parts are interchangeable but I never tried this.

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.

Just what I can tell from the picture: Machine appears to be in very nice condition overall, however, I do not see a presser foot and the needle hole throat in the plate is damaged and the machine seems to be not correctly threaded. I´m not sure if the check spring is there (or broke) cannot tell from the picture. At least the thread is not going through the check spring - thats why I think it could me missing or is broken. It´s not a walking foot machine. It is a plain drop feed machine.

The 45K machine has an oscillating barrel hook but no rotary hook. Hooks are available on Ebay as well but College Sewing indeed has some 45K parts in stock - not many though. But in case you will order from them order make sure you buy a the 2 components of the check spring as spare - better too have than to need. I would also buy 1 or 2 thumb nuts for the tension units as well (same reason). If you cannot find the parts enter the parts number form the parts list BTW the 45K tension unit on Ebay (for GA5 machines) do not work properly - guess how I know. If you have pictures of the machine please post them so maybe we can detect missing / broken parts.

Google is your friend (sometimes) here is a download link for the manual: https://ismacs.net/singer_sewing_machine_company/industrial-manuals/17-22&17-23-manual.pdf Pictures will help to visualize your machine issues.