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29k15engine

29k15 shuttle gear remanufacturing

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great Job 29K15engine!   I have been playing with these gears and rack over the last couple of years.  SItamaco in Spain has the 29K1parts made in China I believe.  They are new.  The drive gears, short rack, following gears, shuttle carrier and set screws are all needed today for 29-4, 29K1-33, 29K51-56machines.  Other than Sitomaco, no one is making them.  thee is a big need for these parts.  Singer made over 250,000 29-4 machines!   

Gear #8608 was used in 29K1-4,10-18,21-23, 32, 33. right of of original singer parts book.  I know no one is making gears for the 51-56.

glenn

Very nice result!!!!!

glenn

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so bit of an update, this is what I am thinking of for an adjustable rack. Rod either threaded M6 metric fine

 

or

 

smooth tube and rod with clamping bolts drilled through tube. Will need to hole up to reciprocating forces so undecided. All in steel, just transparent for drawing:)

 

rack.JPG

Edited by 29k15engine

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looking at simplifying the pivot end so here the part could be laser cut from 1 thickness, then 2 short tubes of id 6mm od 10mm welded to the laser cut part.

Then two opposing m6 nuts clamp the rack, keeping parts simple, available and easy to make.

 

renderrack.JPG

 

precision rack adjustfinalwith2nutsdiag.jpg

steel.JPG

Edited by 29k15engine

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Have you considered metal 3D printing

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Thanks Chris for the suggestion

I think the price would be too much.

This would be quite simple to Mig or Tig together and the strength of metal could be chosed off the shelf to an appropriate spec (not sure what that should be yet, any suggestions for parts that would be metal on metal moving)

Edited by 29k15engine

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I have bought some 6mm id 10mm od steel tube, so I'll try get the other part laser cut then hone the pivot hole to the correct diameter, then mig the tubes to the pivot part.

See where that gets me.

I have dropped the threaded rod by 2mm and adjusted the pivot section so the parts do not take up any more vertical height under the arm.

Thing is I could make this one solid section but I don't have access to a lathe, this way if people want to make this all they need is the tube, get the other piece laser cut or hand cut to dimensions and weld together.

 

 

drop arm.JPG

 

dropped arm.JPG

drop2.JPG

Edited by 29k15engine

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The beauty of 3D metal printing is that you can do quite a few at the same time making it more attractive price especially cogs, worth asking for a quote in your country

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Here is a UK company that does DMLS that may give you some idea, never used it myself, just read about it https://www.3d-alchemy.co.uk/3d-printing-metals.html

 

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Ok so bit of an update, I am very happy with the racks supplied from Italy, part 8600 this can be easily modified to fit the 29k15 and like machines as described below. Part 8599 also stocked in italy can also be adapted to make a 29k15 rack.

I am also proceeding with the development of an adjustable rack to reset the shuttle timing to stop drop stitches and timing issues.

I have also recieved supply from italy of 8608 following gears for the 29k1, unfortunately the gear does not fit easily in the 29k15, the dimensions of the gear teeth are too fat to mesh properly without alot of teeth root filing and thickness, for me that is a no no, with the rack mods below all the filing is on the backs and not on the teeth.

I believe these 8608 gears will fit the 29k1 as the tollerances needed in combination with the long and short rack are not as critical as the 29k15 3 gear 1 rack system.

In fact I am starting to believe that the only way singer got the 3 gears to perform to the tollerances needed was to "finish the 3 gears (2 followers and 1 driving gear)" by finish I mean run them together on a jig until they cleanly meshed and ran smoothly, this may be collaborated by the fact that 29k15 gears have punch marks on the sides of the gears where they were originally meshed, rear follower one puch middle follower 2 punches and the driving shuttle gear 1 punch.

I am still therefore pressing onward to get these EDM cut gears, this will mean I can get gears cut accurately that will be a guaranteed fit without any rework after and therefore be the only new rack and gear designs and sets that fit to the 29k15s out of the box in the world.

 

any thoughts on these finding would be appreciated.

 

Any thoughts on my findings

 

 

new rack1.jpg

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Keep us posted please!!   great job Matt!

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