Advice required Adler 669 vs Adler 869

[Yanni]

We are a leather bag manufacturer in Manchester UK ( please see attached what we make ) and I am about to purchase some more sewing machines.

We currently have 3 x Adler 869 normal cylinder and 1 Adler 669 binder.

Can you please advice whether there is any reason to buy a 669 with the smaller cylinder?

What are the advantages of the smaller cylinder?

Both machines are more than powerful enough to sew our split medium hardness leather of around 2mm and make our satchels as we use 130size needles.

What would the small cylinder of the 669 allow me to do that the slightly bigger cylinder such as the 869 will not?

https://www.duerkopp-adler.com/export/sites/duerkoppadler/commons/download/public/869/869_de_en_fr.pdf

https://www.duerkopp-adler.com/export/sites/duerkoppadler/commons/download/public/669/DA_669_deen_09-2019.pdf

Thanks

[Northmount]

@Yanni Moved your post to leather sewing machines.

Tom

 

[Uwe]

Since you have both machines and can’t answer that question yourself, you don’t really need the small diameter cylinder arm machine. 

In general, the smaller diameter cylinder arm allows you to sew things that the larger diameter cylinder arm can’t (like small three-dimensional objects, whatever they may be - Barbie Doll purses, baby shoes, pencil cases, arrow quivers, etc.) Since you apparently don’t sew anything that the large diameter cylinder arm can’t handle, there’s no real reason for you to use (or buy more of) the small diameter cylinder arm machine (other than the fact that you already have one - might as well use it.)

Many engineering compromises have to be made to squeeze all the moving parts into the small diameter cylinder arm (e.g. limited feed dog movement and   stitch length, smaller bobbin, limited thread size handling, etc.) There’s no need to put up with those compromises unless you have to.

Sometimes it’s the available accessories like binding equipment that makes the difference. Small diameter cylinder arm machines sometimes have better synchronized binding accessories available.