Search the Community
Showing results for tags '794'.
Found 2 results
We bought a second hand 205-370 last Autumn and it's been more than a bit of a hassle getting some parts, needles, etc. for it here in the UK. They're truly quite a rare beast here. With some other work getting in the way before we put "The Beast" to full occupation it's not been until the last few weeks we've been using it regularly . . and we've hit numerous issues . . but the one that has us stumped is that it cannot use the "794 system" needles! WTF!!! That is the chosen, recommended size - indeed only size we think - for this machine. We didn't pay much attention to the needles the machine came with at first, the machine was fitted with a fat one used to produce the grey upholstery hide sample it arrived with and the opened and unopened packets of needles in it's drawer were round point for clothing only. We believe the previous owners used the 205 for work of a lighter nature than what it is capable of and what we bought it for, we need to use the 205 for heavy harness leather work, this machine is only one of two worldwide that it the ultimate for this work and we do know it's strength means it'll still sew when others will grind to a halt. So any issue with needles is worrying. To that end we purchased various points of new needles of the correct size for the 205, this machine uses the 794 range, no other "system" is recommended. We then also sourced the correct, heavier "button twist" type of thread that is OK for the 205 and we need for heavy leather-work. We fitted our first needle and set up the machine to sew only to find that the first needle broke almost immediately, another fitted showed instantly that it's diamond point was burred over. We checked that we were fitting the needles correctly - we were - and our timing, etc. was spot on. It is then we looked in more depth at the needles the 205 came with. They were a completely different system. The one fitted for the leather sample was a Singer 250/27 whilst the packets in the drawer were Schmetz "System 7x23", they were all size 180/24. These are all too small, technically, the 205 was showing it's great aptitude to be tolerant we think. Popping open the cover at the end of the cylinder arm we fitted a new needle and moved it slowly by hand. The needle, a GB 200 leather point, was TOO LONG and it's point was first glancing off the bobbin shuttle and then colliding with the swing hinge for that part. So we fitted one of the 180/24 needles and that cleared all obstructions. So now we know why this 205 came with the wrong sizes of needles. But the 205 is designed to use ONLY a 794 "system" needle. The pair of us took time out one day to fully go through the 205's whole needle and shuttle/hook assembly carefully taking notes and photo's and we hope eventually got some answers. A few of these photo's are attached beneath our text, "A" shows that we're missing the two ring spacers and that the inner ring is simply pushed too far forward . . by it's four springs maybe? "B" shows the needle size that came with the machine passing the bobbin shuttle whilst "C" shows the "794" hitting the same part. "D" shows the two needle sizes side by side and a better view of the "794" hitting the side of the bobbin shuttles hinge . . the inevitable happens each time. This is where we think this 205 is "going wrong". The Machine's bobbin housing sits too far forward and is not spring loaded as it should be, this is totally proven by some of Uwe's video. The grub screw in the side of the cylinder arm which locks the mechanism is not performing as it should it almost misses the inner ring completely when it's required to hold that assembly - so the bobbin housing may be in the wrong place. Incidentally the one shown in our pix is a temporary machine screw replacement to help it work . . the fitted grub screw has a chamfered point. There are also two spring spacers missing and the four small springs behind the hook assembly may also be wrong too. Whilst the needle/hook will collect the bobbin thread the correct needle collides with the bobbin case and, when the smaller incorrectly sized needles that came with the 205 are used, whilst these needles don't hit anything they do drop lower stitches from time to time. Needle too short? This may also be why the two needle protection spacers originally fitted are far too big at the pair totalling 3.60 mm, they don't as such effect sewing but they do an important role in sewing heavy work. They prevent the needle breaking under deflection by weight, so this 205 has the maximum spacing . . was this to try and solve the mechanical issues breaking needles? We would VERY much appreciate ANY input to solving our issue from fellow forum members . . thank you.
YinTx posted a topic in Leather Sewing MachinesI think I could use some help here. Recently removed the round point needles that came in the Techsew 4100 machine I purchased, and installed Organ 794 LR Size 230/26 with white 277 thread. First round was a complete disaster, finally managed to get the results shown in the photos. Not certain it is what it should be though, and I can't say that I'm happy with it. Any suggestions on what I should be doing to get this to be a better stitch? Also looks like it is blowing out the back, not a clean exit. One row is just with the needle, the second row has the thread.