Adler 30-7 Leaf Spring

[GPaudler]

A few weeks ago, the Adler planets aligned and I wound-up with the 120-2, that I already mentioned, and a pretty nice 30-7 on its original treadle stand that is remarkably tight, smooth and silent - the treadle, that is - I haven't gotten the rest of the machine going yet.

Missing is the long flat leaf spring. I looked at a 30-1 at a shoe repair shop in Santa Barbara and took some measurements thinking that I'd make a new spring but the correct steel isn't available, as I had expected. I could experiment with other sizes and shapes but thought I'd check with this font of helpfulness first. Here is an image with part numbers from a manual I found online for Adler 30-10, -50 and -70; I don't know if it would be the same for my 30-7. I would also need the thumb-screwed sliding thing.

Does anybody have any of these parts that I could buy? Thanks, Gary

 

[Constabulary]

Blade springs new are ~150€ + shipping in Germany if you dont find them.

http://www.wdn.de/artinfo.php?artnr=A23636

EDIT:

I have the complete sliding block and the foot pressure adjustment screw + thumb nut if that is missing too.

 

Edited August 5, 2017 by Constabulary

[trash treasure]

8 hours ago, GPaudler said:

Missing is the long flat leaf spring. I looked at a 30-1 at a shoe repair shop in Santa Barbara and took some measurements thinking that I'd make a new spring but the correct steel isn't available, as I had expected.

If you're willing to give a shot at making one, have you tried McMaster Carr ? They have spring steel in many sizes and thicknesses :

https://www.mcmaster.com/#standard-spring-steel-sheets/=18t37pq

 

[GPaudler]

Thanks Constabulary, I might take you up on the sliding block if I find a spring. I would love to not spend 150€.

McMaster is the first place I looked and I too expected to find spring steel in something close to the right thickness, but no luck. Though I might try to approximate the right springiness with a rod instead of a leaf if I can't find the part. Thanks.

[dikman]

Two thinner pieces stacked together? (No idea if it would work). If you have a belt grinder then a slightly thicker one can be thinned down (common practice with firearm springs) although it might take a while with a bigger spring. Sometimes they reduce the sides of the spring, rather than the thickness, by making it an "hourglass" shape.

Just trying to come up with a few possibilities.

[trash treasure]

40 minutes ago, dikman said:

Two thinner pieces stacked together? (No idea if it would work). If you have a belt grinder then a slightly thicker one can be thinned down (common practice with firearm springs) although it might take a while with a bigger spring. Sometimes they reduce the sides of the spring, rather than the thickness, by making it an "hourglass" shape.

Just trying to come up with a few possibilities.

HA!

I was just about to post, and suggest this - Like leaf springs on a car ............

[GPaudler]

Thanks Dikman and TT, I was thinking multiple leaves too so I could add and subtract to get the proper rate. Also drill rod, which I have, could be tapered. 

I should have already thought of this - it just occurred to me - I'll see if the spring from my 29-4 works, if so, it will give me something to match with leaves or a rod or something.

[Constabulary]

BTW - the Singer 29K leaf springs are the same

[GPaudler]

19 minutes ago, Constabulary said:

BTW - the Singer 29K leaf springs are the same

That's good to know. Is that also true of the 29-4?

Did the 29-4 precede the 29K series?

[Constabulary]

I´m pretty sure! I have not seen a 29 (w/o K) on my side of the pond but they should be the same.

29 were made in the US and 29K in Kilbowie, Scotland.

If you find parts list of either machine compare the part numbers.