Yeah - I meant vertical bobbins in general, not necessarily differentiating between side and front loaders.
Oh, come on. Paging @shaddack and @nixiebunny.
Good money says between the two of them, youāve got an answer within a week. (You know, if you can make them give a damn.)
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Well, if it was on me Iād put a separate servo on the x-axis that does the zigzag movement, and put it under computer control.
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Oh, Iām interested, intellectually, but I know exactly one person in the world whoād find it useful. OK, two, counting you. 
My machine has a treadle and a leather belt, in case that wasnāt obvious from my earlier posts.
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who is this mysterious other? Iād like to know.
This design would make sense, wouldnāt it. Every zig zag machine Iāve ever seen - from 1950s Japanese Singer clones to modern $10k Berninas all swing the needle bar. Because of this itās very rare to see any machine with stiches wider than 9mm. Some 9mm machines - even modern premium models will have trouble maintaining good quality stiches in the +/- 4.5 margins because of this.
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Itās probably worth noting that Iām sure the sewing machine industry had no real incentive to fix this. Maxi-stiches are a selling point (even though they arenāt practical) and having a wide range of needle positions can be handy, but they donāt want to cut into their super profitable embroidery unit market. Why invest in adding a couple more mm in needle positions when most people wonāt use it and embroidery units can do some 300x300 mm (and make a huge profit on the accessories)
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Carol Huff, of Indigo Hound Productions. The only professional textile artist I know with an advanced degree in computer science (Iām sure there are others, but I donāt know 'em).
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