All Activity

Is this motor optically controlled? If so, there were people printing variable density optical filters that users could install inside their digital motors. These filters smoothed out to speed variations so the motor started at zero rpm and steadily increased as the operator pushed down on the speed pedal. Stopping the foot motion left the motor at that speed until one backed it off or pushed down further. I had this modification on a motor that came with my Cowboy cb4500, in 2011 or 2012. I would compare the action to the analog motors that replaced it.

You never know if the person is visiting w/o logging in. It always does seem like they should at least acknowledge the responses. But, that's the world we live in now, I guess. Get off my lawn, too.

Couldn't have said it better. I know I should have gotten used to this being grown up etc. But it still comes as a surprise for me everytime someone asks a question in here, and lots of people bend backwards with good sound advice - only for the OP to never visit the site again.

I'd probably just buy this machine. I like the Singer/Seiko clones and this one has a reverse that's maybe easier to use (opinion). Don't know what size bobbin that "Typical" uses....So I'm guessing it's the "Typical" bobbin? Wonder if you have a little ability to negotiate with the merchant on price? When you ask for advice everyone has a different idea of what a machine should be used for. It's also pretty easy to spend someone else's money.... You can sew allot of various things on this machine. You can sew handbags and wallets on this machine no problem. watch bands also. A smaller diameter cylinder arm would be a plus on maybe an infrequent occasion, but this might be all you need? Heavy saddle work? No, but sounds like that's not your thing anyway. The 341 clones are a good choice but not necessary if it is more expensive. It's kinda like asking a farmer what tractor you should get to move hay? One would say a Ford, one a Deere and another a Kubota. The Deere and Kubota may have wet brakes and better hydraulics, but the Ford will move the hay bales around just the same-And for less money.

1

It does appear to have been used in a few different machines, lucky for me. I think this machine is the ancestor of the W&W D12, except the couple of pictures I can find of the D12 show a single bobbin serving both needles. This is by no means definitive, just me searching the net.

Thanks for taking the time to send this along. It's quite close, a good clear copy and has an Adjusters section, which I don't have. Very helpful!

I'd probably be willing to pay $300-500 for really good quality, high torque brushed servo that was a simple unit like that. Something bullet proof, easy to use and strong as an ox. Doesn't really have to be restricted to a "middle-priced" unit necessarily.

The manual for this machine is very close to yours. 72w19.pdf

It looks to me that you've just drummed up a thread on this forum to make sales of what you already market, Right? You're asking for input on "designing" a new servo, yet debate every time someone mentions a point or suggestion contrary to what you're already marketing/selling. For example when a member suggests options for supply voltages, you just jump to market your "Kenedyne" motor as it's available in both. You should have said, that's a great idea, we'll incorporate that into the worlds best heavy servo motor that we're working on, maybe we'll make it a dual voltage, plug and play unit! If you're looking to design a servo for leatherworkers to use on heavy stitchers, follow our collective advice and be open minded. If you want to add all these features including a ridiculous "jog dial" you're not really going to get anywhere. ISM in the Republic of China already has the best servo going with all those "other" features we don't really need. The ISM SV-71 650w servo is around $300. I bought mine from College Sewing machine for 189GBP ($258). Those units are light years ahead of any of the lower cost PRC made units and not all that inferior to a Ho Hsing unit. Maybe I'm a little too skeptical, I don't know. It could be something innocent like a mistake in translation from English to Chinese, or maybe a cultural communication mismatch? The members here buy Servos for 2 reasons. 1) Better low speed control 2) Needle Positioning Those are the only major advantages they have over a clutch motor and yes, clutch motors are very much still a thing. They're nearly indestructible, basic, easy to adjust, and power machines along all day, every day. I actually like the faint hum they make, you know the machine is on. Yes, they do consume a little more power, but unless you have a shop floor with 100-+ machines running, it's not an issue. If you factor in maintenance/repair/replacement of burned units as well as electricity consumption over a 10 year span, servos could and probably do, carry a higher cost. I have 21 clutch motors operating on my shop floor, the oldest date on one is 1967, the newest is dated 1993. (Most all are made in Taiwan/ROC back when that wasn't really a great thing quality wise). I seriously doubt any brushless servo would last 30-50 years?

Like @dikman I did a similar search for servo motors and I find that I can get a Brushless for about $150 CAD or a Brushed for about $200 CAD. As I don't need or want a Brushless servo motor or any of the additional features the documentation needed for a Brushed servo motor is so basic. 5 easy steps: 1. how to install the servo motor and mechanical linkages, 2. install belt to the machine or belts if you have a speed reducer, 3. set speed by turning the speed dial, 4. plug it in to a wall outlet, 5. turn power switch on and hit the "go" pedal. If at some point a Brushed servo motor fails you typically have to replace the servo motors fuse and brushes. If a Brushless servo motor fails chances are you replace the complete servo motor setup. kgg

The part # you are looking for is B1525-053-0A0. An original Juki part will have the needle guard while a lot of after market ones will just be the presser foot. If you contact a Juki dealer and ask for the complete presser foot assembly you will get it with the needle guard. Another alternative is to buy a Needle Finger Guard off places like Amazon. Example: ( https://www.amazon.ca/YICBOR-Sewing-Machine-Brother-Machines/dp/B08ZCF899N/ref=sr_1_17?crid=UO5IAKRG7BVO&dib=eyJ2IjoiMSJ9.2fLw6Era9Ry_EQb4ctlNR0XMnKd9cxPTyATq6kljrRUsFAsAY60K0rL24TCK1bhBM71KGBRj_bN5NkMMVaN4cKrL0Ttl1dPFMzVojOWsPo7wY9ruXUERvP51UQ9Z6Ws0-PC59GirIwKvznJSxcsbXhB2D9FV30xEjQtKF_ez23X6JfLEHT1L_DGHy5IyTM5Gud5gVQ5sQeej1YO1MFbOCaz30Vq3Omf80-yk9hkngzDM7Zv7Kht2CXjrZ-tNUZxKCzXU_reMtpUjrD4o9CfPCmsvX480rlFWypy8fpcw3Lw.v6_DjuKOKwrz96P_yooYKPm6sQqqEQ2RE5efMMrS0UU&dib_tag=se&keywords=needle+guard+for+Juki+presser+foot+for+juki+ls-341&qid=1751713038&sprefix=needle+guard+for+juki+presser+foot+for+juki+ls-341%2Caps%2C317&sr=8-17 ) kgg

I learnt sewing with modern servo motor with needle positioner. I am buying them in Europe from a big reseller, Strima, they are around 300 euros. They start at 100 rpm minimumspeed I think, 750 we. Thanks to needle positioner I don't miss lower speeds. I do needle up, needle down and I can go step by step when I want. And the needle is always in the right position (locked stitch or open tensioner etc) so working is easy and precise. I don't need and don't want a speed reducer under the table. A jog dial would be useful to limit upper speed which I need to do on the controller. I also miss more robust needle positioner with better and easier fixing to different types of machines. For me a middle priced servos with good documentation and support would be interesting. Efkas prices are too steep, the cheapest Chinese imports are undocumented and have often strange quirks that are difficult to solve

Wiz, thank you for this info. I wasn’t sure if the minor difference was an adjustment issue or just how the machine sews. As this machine was in poor condition I wasn’t sure if I could adjust backstitch to be nearly perfect. Your input helps me believe backstitch is good and and to move on to practicing sewing. I also do the “poor man’s reverse” on a Tippman Boss. I did the adjustments Friquant recommended which significantly helped. The tip to use the tape to mark when the presser foot and feed dog doesn’t move when holding the reverse lever also was greatly useful. Much Thanks to you both.

Only for your information, before we sell our industrial sewing machine with cheap servo motor arround Au$ 140, too many troubles, that's why we start to make servo motor. In Italy and Sweden, they use Effka motor before, now use Kinedyne, saving a lot, instead of spending more..

Thanks, to manufacturers in China, India, Indonesia and other Asian countries, we use Kinedyne HM-750L low cost motor, because they need efficiency, instead of "low speed", compare to other Chinese motor, the advantage is high durability. Yes Kinedyne HM-750SH low speed high torque servo motor is ideal for leather sewing machine. At least, the motor can greatly improve the performance of our leather sewing machine.

Keep your fingers out of the way & then guards are not needed.

Just did some checking, your current servo is available here (Australia) for Au$500 plus shipping, generic servos start at Au$ 140 shipped. Bit of a no-brainer really, even at $200 it leaves me a lot of money for other things.

Mmmm, ok, this is primarily a hobbyist forum and our needs/wants will be different to those of a large manufacturer of leather goods. WE want controllable slow speed and torque out of a servo but to a manufacturer slow speed = lost time so I doubt they would be interested. Your potential market is harness makers, saddlers and those who make goods using heavy leather but it is not exactly a huge market, in fact I would say it's a very specialised market, with probably very limited sales possibilities. The obvious market is to convince those Chinese manufacturers of leather stitching machines to use your motors with their machines but that's probably unlikely as they will be dictated by cost and the cheaper generic motors work well enough for them. You're not appealing to the hobby market as your motors are in the upper price bracket, so I'm not sure where that leaves you. To get back to your original post, so far it's not looking good for your "options", other than a good variable speed control. If your Swedish/Italian people need them then it shows that their needs are different to ours as hobbyists. So who are you going to cater for?

I am not trying to promote servo motors here. We want to make the best servo motors for the leather industry, and leatherworker.net is the club of world's top leather players...I need your experience

If you consider Ho Hsing and Efka as your competitors then you've come to the wrong place to promote your servo as very few on here buy those motors (other than as used units that come with a second-hand machine). You can't compete with what most of us buy, generic Made-in-China servos off ebay (or from a dealer, selling those same generic servos). You're response came in while I was typing, you're missing my point, I can buy a generic servo and a speed reducer for less than your motor and it will achieve the same results. For me it's even cheaper because I make my own speed reducers. At one point I had a machine that could do one stitch every 3 seconds, it's not that difficult to achieve.

Thanks for your opinion! Before making Kinedyne servo motor, we sell other brand "servo motor" for our leather sewing machine! The fail rate of board is about 7%. We spent a lot of time and money for service after sale! Cluth motor is too bad for leather sewing machines, so we produce Kinedyne 750L economical servo motor, it is durable motor with good price, but the minimum speed is 300 RPM, customers still need to buy speed reducer! Why waste money to buy speed reducer? We developped Kinedyne HM-750SH low spee, high torque servo motor. Finally we spend less money with high performance servo motor!!

Our competitor is Ho Hsing i90 and Efka servo motor, not Reliable or Sailrite😁

When I bought my first servo I was fascinated by all the settings in the menus, over time I realised that for the most part they were irrelevant as once I had it running to suit me I didn't need to change anything again. Like KGG once I have it set to an optimum speed (for my needs), including a speed reducer as the generic servos need one, then I don't need to change anything. Your Kinedyne is apparently a superior servo compared to the array of generic servos available but the price reflects that and while I would love one as a hobbyist spending that sort of money isn't justified when the cheaper option is working fine. Plus I have more than one machine! I'm not sure which part of the market you're aiming for, the vast majority on here are hobbyists and like me can't justify the expenditure for a Kinedyne so you're unlikely to achieve much in the way of sales and if you're aiming for the commercial market you've come to the wrong place.