Speed Reducer And Servo Motor?

[buffalobill plus Ed D]

just a quick question for you guys, whats the advantage of a speed reducer and servo motor on a flat bed machine?is it better than just a servo?more torque? just seen a couple on youtube and wondering why

[Ferg]

I have two sewing machines, flatbed and cylinder arm. Both have the same Servo Motor and speed reducer.

The speed reducer enables the servo to maintain a more stable degree of power at whatever speed you desire to use.

I love it. Have used mine enough that I increase the speed considerably on straight runs but I still like to sew fairly slow, makes it a lot easier for us old men to know where the needle is going.

ferg

[Northmount]

Motors have reduced torque at low speeds. So when you are trying to go slow through a difficult part, there isn't enough torque to punch through thicker or harder leather. Then you either hand wheel it, so now have only one hand to guide the leather with, or you step on the pedal harder, and ... Whoops, went further and faster than you wanted too!

So adding a speed reducer lets the motor run faster, so it has better torque output, plus the torque amplification due to the speed reducer, now you can run heavier leather at low speeds and keep both hands on the job.

I have both a speed reducer and a servo with 3:1 gear reduction. Can go as slow as one stitch in three seconds, so can stop at any needle position, and make complicated turns, all without hand wheeling it. My top speed is a little on the slow side, but I'd sooner have it a little slow and have the torque I want at low speeds.

Tom

[J Hayes]

Motors have reduced torque at low speeds. So when you are trying to go slow through a difficult part, there isn't enough torque to punch through thicker or harder leather. Then you either hand wheel it, so now have only one hand to guide the leather with, or you step on the pedal harder, and ... Whoops, went further and faster than you wanted too!

So adding a speed reducer lets the motor run faster, so it has better torque output, plus the torque amplification due to the speed reducer, now you can run heavier leather at low speeds and keep both hands on the job.

I have both a speed reducer and a servo with 3:1 gearing reduction. Can go as slow as one stitch in three seconds, so can stop at any needle position, and make complicated turns, all without hand wheeling it. My top speed is a little on the slow side, but I'd sooner have it a little slow and have the torque I want at low speeds.

Tom

You're running a reducer on a gear reduction servo motor? Was the servo with the gear reduction built in not doing it? I'm needing a new setup myself.,not trying to hijack.

Jeremy

[Northmount]

You're running a reducer on a gear reduction servo motor? Was the servo with the gear reduction built in not doing it? I'm needing a new setup myself.,not trying to hijack.

Jeremy

Yup. I switched from a standard digital servo to the Sewslow pro, but still needed some help at low speed. So cobbled together a jack shaft with a 6" and a 3" pulley, added a short belt to the motor, and it does what I want now. Mine is a Techsew 2700, same as Cowboy 227, which has about a 4" pulley in the hand wheel. If you are getting a heavy stitcher with a large pulley on the head, you might not need to double up the reduction like I did. See if you can test out the machine first with the heaviest leather you will ever sew, and the lightest you expect to do on the same machine.

Tom

[J Hayes]

Tom

I've got a Singer 153w101, I believe yours is a clone of that, so its great to hear whats working for a similar machine. What do you mainly put through your machine?

My clutch motor is s bit much even with a 1.75" motor pulley.

Jeremy

[Northmount]

Tom

I've got a Singer 153w101, I believe yours is a clone of that, so its great to hear whats working for a similar machine. What do you mainly put through your machine?

My clutch motor is s bit much even with a 1.75" motor pulley.

Jeremy

Up to 2 each 8 to 10 oz veg tan. And as low as one 3-4 oz. 3-4 oz was obviously no problem. But 8 oz and up was a problem low speed wise.

Tom

[buffalobill plus Ed D]

wow thanks for the great replies!!!!soooo much help here!!!!

[billymac814]

Tom,

I'd love to see pictures of your speed reducer set up.

Yup. I switched from a standard digital servo to the Sewslow pro, but still needed some help at low speed. So cobbled together a jack shaft with a 6" and a 3" pulley, added a short belt to the motor, and it does what I want now. Mine is a Techsew 2700, same as Cowboy 227, which has about a 4" pulley in the hand wheel. If you are getting a heavy stitcher with a large pulley on the head, you might not need to double up the reduction like I did. See if you can test out the machine first with the heaviest leather you will ever sew, and the lightest you expect to do on the same machine.

Tom

[J Hayes]

Tom,

I'd love to see pictures of your speed reducer set up.

+1

Jeremy