Hi, I have a problem with my stitches. The problem is that the stitches are not aligned nicely, but are dancing (a little up, a little down). For example, I use the following pricking iron:
Hexagon pricking iron
Pricing iron tooth size 2mm
Distance between prickin iron tooths 3mm
I used thread of thickness 0.45mm.
The last product I had a problem with was a wallet, about 4mm thick.
I used the guitar technique when sewing (right hand down, left hand up).
I'm using that kind of sewing clamp: https://cdn11.bigcommerce.com/s-e77e4/images/stencil/1280w/products/7118/60972/Leather_Stitching_Pony_w_clamp__39370.1707874680.jpg
Below is a picture where you can see the stitch (dont look at cornes and other mistakes, the only plan was to test the stitching line and align it). I used the pricking iron to pierce the leather all the way through. On one side I sewed as the pricking iron did, on one side I used a diamond owl to enlarge the hole from the sewing side, and on one side I used a diamond owl to create a hole from the back. All the stitches have the same problem (back of of the wallet is better vs the front), so I can probably rule out the hole problem.
Maybe it's because of the thickness itself? What can I do in this case?
If it is not, any idea or recommendation for a straight stitch?
Thank you very much!
@ffzanchetta raises some good points.
I think the main issue here is the use of soft leather. If you are new to leatherwork, it takes more experience to see the same perfection in stitching as firm vegetable tanned leather (which is much easier to work with).
Are you using any kind of reinforcement behind each layer? A thin fabric backing, glued with PVA makes for more rigidity and cleaner stitching (plus a stronger product).
The truth is you are making a few minor mistakes here and there, and soft or thin leathers are unforgiving of any change in technique, no matter how minor. With experience and practice, your consistency will improve where the leather type will not matter.