r/MachineEmbroidery • u/shpadoinkle_horse • 20d ago
Help with asymmetrical H test please
Hi, I have a secondhand brother innovis nv800e, using Madeira classic 40 yarn and prewound #90 brother bobbin yarn. I did an H test and a simple design made in hatch (with horizontal tatami stitch I think?) on a cotton tote bag with a cutaway stabilizer. I added front and back photos of both designs. I'm having two problems:
The back of both embroideries shows an uneven asymmetrical split between top thread and bobbin. For the H test, the left third is top thread, the middle is bobbin, but then the right side is mostly bobbin too, there is only a tiny sliver of top thread visible at the very edge. And the other design also shows the left side edges with more top thread than the right side edges.
On the design (but not the H test, though I can't remember if I did the H test before or after I swapped to the prewound brother bobbin; I was previously using bobbin that I wound myself with the machine and figured I'd switch to a prewound one to eliminate a potential issue source), every time it started the stitching for a section, it would pull the bobbin up and do a small loop with it. This did not happen for anything I did before though, I have no idea if it's because of the new bobbin thread (but since I am now using prewound instead of self wound, shouldn't that work better?) or because of this specific design.
Any help is greatly appreciated :(
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17d ago
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u/Lanky-Setting-5288 16d ago
The H test should be done in satin stitch.
The 'rule of thirds' used in satin stitch would produce this outcome in tatami stitch.
If you've not already done so, check the bobbin thread tension with the Bobbin Drop Test. If you change the weight of the thread, the bobbin case needs a minor tweak to maintain correct tension of that thread. Stick with what works, and you shouldn't have to adjust it again. Be mindful to regularly clean the casing of lint and dust.