lSherlockl

Thats a bummer but thanks for the help. At least i may have some info to go off of at least for finding parts etc as i have some other machine to go off of. That being said looks like i got a new problem to sort as i thought stitch length had something to do with why reverse was misbehaving (aka the thread likes to tear itself apart in reverse) but another day and probably better suited to another post than re-using this one. I sincerely appreciate the help though!

So i did some examination/testing based on this diagram. so based on my close up with highlighted parts earlier that is not the adjustment that bolt and set screw is keyed meaning the bolt has a flat side adjusting it does nothing and the set screw will just bring it back to its original resting spot of flat side up. that being said between that and Uwe's comment on the eccentric adjustment bolt with a set screw i think that may be on the right track but given everything is in sync it could only be a few ones that would potentially have the power to adjust the stitch lenght balance between forward and reverse. ill look around some more.

If i follow the (no offense) poor manual image these would be my adjustment? it is the area that i determined must be at fault but it didn't seem obviously adjustable. But if the left circled bolt is a eccentric cam or whatever the proper term is it would make sense. now just to figure out how the heck to get in there to adjust it as im not sure i have the confidence to remove parts (without messing something else up that is) to get it it

Wow thanks, Looks incredibly similar. So based upon your notes and video I had traced the guts to the "butterfly" as you call it and yes to the best of my ability its pretty well centered. and both "wings" if you will are enganged when all the way released and all the way engaged. with stich length set to zero there is a little play in the reverse lever and just under 1mm of movement from the feed dogs/presser it places holes in carboard literally adjacent so it cuts a "slot" imagine this has some effect but may not be the whole story 1.) at max stitch length the feed dog is all the way forward as it comes up and not technically all the way backward but at the furthest position of its reward travel before it goes down when the machine runs forward. Whith the reverse lever held down the same is true however both the presser foot and the feed dog do not move as far back but the pick up/down at the apex of movement like they should. its just the apex is in the wrong spot 2.) Descending needle hits the plate at the same time the feed dogs begin their descent. and the presser foot lifts at the same time. I think this makes sense or is correct as its not compound walking foot so the needle goes up and down in the space where the feed is being reset. otherwise the needle would get pulled and snapped when advancing the fabric/material right? I had also inspected and removed the stitch length dial/screw and that was all in good shape good symetrical nose on it, not much wear on the "butterfly" what irks me is it seems like i can see and trace back to the area that something is off but looking at it nothing that you could move or adjust makes sense that you could do it to fix it. (but i am very new to this, not technically things but this sewing machine is quite the interesting device) also noted on pictures, ill upload here in future, past most forums prefer external links. thanks!

Hello, Think this post fits here and meets requirements. Been a bit of a lurker but got my first walking foot machine and there seems to be a very knowledgeable community. I was hoping someone could help me or point me in the correct direction of how to adjust the backstictch length on my machine, currently approximately half of forward stitch at all lengths. Its a Chandler Chandsew 100RB which i know must be a clone of something no clue what ofthough. I have a "manual" for it/ the DY377 which does not cover stitch length tuning. So far I have cleaned and relubed everything and re-timed the machine per manual, forward works and stitches well, backstitch can seem to make the thread fray and its significantly shorter (verified using cardboard). I have also carefully examined to make sure that it wasn't some synchronization issue between the presser foot and feed dogs but they seem in perfect sync forward and reverse. I have also read about every post on here i could find about adjusting backstitch and couldn't find anything relateable. HERE is a album of the head: http://imgur.com/a/eSwbR Thanks for any info and or any help