Juki Double Needle Install
 

im trying to stitch leather together and then use double needles to do decorative finish. i see i can buy double needles them themselves ... but can some one point me out if i need to upgrade modify table below where bobin is? (sewing is not my industry so im figuring out what im doing) I have Juki machine
any feedback is appreciated

Which Juki? The TL mechanical models and the industrial models cannot accept double needles. They are single needle-only machines.

mkc is correct. Any machine with a side-loading bobbin cannot accept a double needle.

i have HZL-F300
in my interpretation bobin is top loaded

If you don't have a manual, there is one available at https://www.jukihome.com/media/catal...ion_manual.pdf on page 84 & 85 of the pdf or 83 & 84 of the actual manual shows how to use a twin needle. The automatic threader and thread cutter can not be used with the twin needle. I'm fairly certain that not all the patterns can be used with a twin needle. It looks like it will have a circle with a slash if the pattern selected cannot be used with a twin needle. Also it will need be set for the center needle position.

oh i guess i had sorter version of manual as book i got does not look like this one :)
so good news it supports twin needs bad news span between them is only 2mm :(((
or maybe it still possible to run like 6mm needle just make sure its straight stitch so they don't move around?

The issue will be whether the hook mechanism can support it. If the manual says it only supports 2mm separation, then it only supports 2mm separation. If you use the wrong twin needle, you can damage the hook mechanism and that could be a costly mistake.

ehh no fun
is there any way to find what machines support twin needles with longer spans?

The manuals I have for my machines usually say whether or not a twin needle can be used. I don't think most if not all straight stitch machines would be able to. My manuals have listed the width of the twin needles also.

? maybe I am misunderstanding what a side-loading bobbin is but all three of my Bernina's which have a vertical, sideloading bobbin can be used with a double or triple needle. Of course I am limited as to the width of any stitch I use with the two that are 5 mm machines.

Don’t forget to try a sample of the stitches first.

I believe the back will have zig zag stitches when a double needle is used. It’s been a while since I used them.

zigzag will be strage :) though i dont carre how it looks but let me see if i can do settings 1st, manual is bit unclear to me as it says select stitch that supports double needle ... em well like i know which one does, though i needs mad simple application
i just ordered needles but will see if i can concur settings now

Yes, double needles will have a zig zag on the back. There is only one bobbin thread so it has to catch the thread from both needles.

Interesting . . . What Bernina's do you have that have side loading bobbins? I've had 5 and all had front loading bobbins.

oh so once i see in car upholstery use 2 bobbins or something? as when i see whats on back of car seats its straight lines and i know they use 2 needles and separation guide in between so it follows exactly in center of 2 sheets stitched togather

I am pretty sure mine have the same configuration as yours do. I was thinking side loading ones meant just not the drop in top...but I see what you mean. My long arm has a side vertical bobbin while the berninas would have a front loading vertical bobbin while my Vikings had a top loading drop in bobbin. Yikes. Terminology. I don't even know if I am using the right terms now. I would have to draw pictures! Or would the long arm and the Berninas have a front loading vertical bobbin as the bobbin opening faces me as I use the machine well the Berninas are in the cabinet sideways and the longarm is on the frame nose pointing at me.

Yes, the industrial twin needle machines used in auto upholstery have 2 bobbins, one for each needle.