CrowsNest Report post Posted February 20, 2023 (edited) Hello! My husband and I got a little excited and purchased this beauty at auction without realizing the complications of 3-phase power source. We tested the machine at the factory we hauled it out of, so know it works, however there isn't much else we know about it. We hate to see this machine just rot in the garage while we attempt to figure out how to power it. We don't want to change the motor to single phase and potentially ruin its usability. Would love to see it go to someone who can put it to use, we all know these workhorses will go on. Here's what we do know: Singer Sewing Machine, Model 7-31, Serial Number AF653437, Consew Clutch Motor, 0.5 HP, Power 220 Volts / 3 Phase, Reverse pedal After searching through some of the advice and guidance on here, looks like the heads for these can go for upwards of $1.5k. Make us a reasonable offer. Thank you for your time! Edited February 20, 2023 by Northmount Converted photos to jpg so visible to all members Share this post Link to post Share on other sites
Northmount Report post Posted February 20, 2023 @CrowsNest Please read the marketplace rules and conform. You must identify any shipping information, etc. Share this post Link to post Share on other sites
CrowsNest Report post Posted February 20, 2023 2 hours ago, Northmount said: @CrowsNest Please read the marketplace rules and conform. You must identify any shipping information, etc. My apologies, still getting my bearings on using the site. Thank you @Northmount I will correct asap! Share this post Link to post Share on other sites
CrowsNest Report post Posted February 20, 2023 5 hours ago, CrowsNest said: Hello! My husband and I got a little excited and purchased this beauty at auction without realizing the complications of 3-phase power source. We tested the machine at the factory we hauled it out of, so know it works, however there isn't much else we know about it. We hate to see this machine just rot in the garage while we attempt to figure out how to power it. We don't want to change the motor to single phase and potentially ruin its usability. Would love to see it go to someone who can put it to use, we all know these workhorses will go on. Here's what we do know: Singer Sewing Machine, Model 7-31, Serial Number AF653437, Consew Clutch Motor, 0.5 HP, Power 220 Volts / 3 Phase, Reverse pedal After searching through some of the advice and guidance on here, looks like the heads for these can go for upwards of $1.5k. Make us a reasonable offer. Thank you for your time! Updates: Condition: Good Price: $1,500 Shipping: Pick-up Only - couldn't imagine how one would ship one of these... open to it with guidance and at buyers cost. Please reach out with any questions! Thank you again. Share this post Link to post Share on other sites
JHLeatherwood Report post Posted February 23, 2023 I'm no expert, but... The motor, and it's controller, are absolutely not stock to that head. If you like the head, buy a servo and speed reducer and put it to work. It's not going to change the head's value. Share this post Link to post Share on other sites
CrowsNest Report post Posted February 25, 2023 On 2/22/2023 at 5:17 PM, JHLeatherwood said: I'm no expert, but... The motor, and it's controller, are absolutely not stock to that head. If you like the head, buy a servo and speed reducer and put it to work. It's not going to change the head's value. Thanks so much for the insight and guidance @JHLeatherwood Appreciate it! We weren't sure if it would effect the usability of the machine, but it seems like that might be the route we go. Share this post Link to post Share on other sites
Doc Reaper Report post Posted March 9, 2023 (edited) Be good to know where this is located, 3 phase is definitely ancient, I thought 3 phase was phased out. Aside from the motor, the rest appears to be ok, where do you come up with $1500? Is it a walking foot and is the top pressed wood? Sooooo many questions I don’t think I know em all Edited March 9, 2023 by Doc Reaper Share this post Link to post Share on other sites
CrowsNest Report post Posted March 10, 2023 Hey Doc Reaper, We're located in Cleveland, Ohio. We were not aware of the 3 phase situation when we purchased these, hence part of the reason we're selling the machine. We were going to use it in the community garage we belong to, but their 3 phase doesn't align with this 3 phase. The price is certainly negotiable, as I was going off some of the advice seen throughout the knowledge of this group in other threads. We did test the machine upon picking up from the factory we grabbed it out of, and it worked beautifully. Yes to walking foot and the table is pressed wood. I'd love to be able to answer all of your questions, as they come to you, and will do my best to do so. I just know my knowledge is limited. Thank you so much! Share this post Link to post Share on other sites
Marcremb Report post Posted March 14, 2023 You are all right about servo motors. l have 6 sewing machines with servo motors on and it works very well and 2 with clutch motors, my overlock and my Mitsubishi lu2 410 Automatic walking foot sewing machine that as this 3 phases 220 volts motor on that i recently got for free. Because it as an Automatic system on it that wanted to use to go faster i decided to leave it with the 3 phases clutch motor. So i bought this New converter on the market : DPS (digital phase shifter) that concerts 220 volts single phase to 220 volts 3 phases. It works perfectly at a low price. It is made in South Korea . I bought it at Ebay. Just in case you want to have a faster set up than adding a servo motor. I am very happy with the device. You can look at the YouTube how to connect it https://youtu.be/Honlrv93_oU Share this post Link to post Share on other sites
