29k15 shuttle gear remanufacturing

[chrisash]

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

 

[29k15engine]

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

 

 

[29k15engine]

[shoepatcher]

Keep us posted please!!   great job Matt!

[29k15engine]

will do, just waiting for the gears to be cut, in the mean time Im redecorating our bathroom, plastering and tiling is not fun

[29k15engine]

Ok so after many weeks my friend has got the peices done on a wire erosion machine, what a good job was done!

I have tried the rack part which meshes perfectly with both original pinion gears and the machine itself.

So does the bottom plate i had made.

The new gears mesh perfectly with each other and original gears. I have yet to hone them to fit the pinions in the bottom 29k arm ( made them to hone as i didnt want to go through all this to find them too loose. Plus after that they need the lower bearing shoulder to locate in the bottom plate. So ill be back soon. After this i can let you have the universal files so you can make your own.

Edited November 14, 2021 by 29k15engine

[29k15engine]

Parts placed together

[DrmCa]

On 6/25/2021 at 2:08 PM, 29k15engine said:

made from copper brake pipe wrapped round a pipe, then cut and formed into a ring.

Thank you for a neat trick! I too have a coil of brake cupro-nickel pipe lying around. Mind you, it turns green if left in the moist environment, so probably it is a good idea to find a way to coat them rings.

[29k15engine]

Here you go all parts fit in the 29k15.

The gear thickness needs to be spot on as it is sandwiched between the arm and bottom plate.

The bottom plate needed a slight file to the two long sided so it seated where the screw and pinion bearings wanted it to go( we are talking a few thou)

The hole in the gears was made undersize to allow differences in pinion wear( ream to fit your machine)

My friend used hardened tool steel so only a hardened tip drill would do the job.

 

Next job is make up the adjustable rack. Getting there now, i will post the gear , rack and base DXF files soon for anyone to try them in their machines

 

 

https://1drv.ms/v/s!AoQ4CZYzE-ZEkWlLataRevmLAfCu

Edited November 18, 2021 by 29k15engine

[29k15engine]

Some photos of the new gear on the right and an original out of my 29k15 on the left