JeffHami Report post Posted January 1, 2018 I purchased a Consew CSM1000 Servo Sewing Machine Motor and it is working great on my Singer 153W 100 but I would like to install a speed limiter. While working on Christmas presents for the grandkids my wife got out her sewing machine to help me do so light sewing. She was showing me how she could set her machine to turtle mode and no matter how hard she pressed on the foot pedal it would still go slow. I was thinking it should be easy to put a speed limiter inline between the speed controler and the motor. This way you could set the max speed and if your foot slipped it would not speed up and mess up your work. I'm no electronics guys , but this seems like something that could be made. Is there a reason this couldn't be done? Quote Share this post Link to post Share on other sites
KingsCountyLeather Report post Posted January 1, 2018 I’d be interested in knowing the answer to this question too. Quote Share this post Link to post Share on other sites
brmax Report post Posted January 1, 2018 (edited) You might have to get an additional speed reducing pulley setup, or try some of the speed options on your setup Good day Floyd http://www.consew.com/View/Consew-Model-CSM1000 Edited January 1, 2018 by brmax Quote Share this post Link to post Share on other sites
Uwe Report post Posted January 2, 2018 You'll have to press a few buttons to select a top speed the motor is allowed to spin at. The Consew CMS1000 manual will tell you the details. "Read manuals" sounds like a great new year's resolution. Quote Share this post Link to post Share on other sites
JeffHami Report post Posted January 2, 2018 The unit only allows for a minimum speed of 500 rpm. When I press lightly on the pedal and get a nice slow speed that works well and is easy to keep up with, but it's hard to keep your foot in that position. I would think I could some limiter inline that would not allow the unit to go over that speed. I was thinking about having a large pulley made that would slip of the original pull and locked in the place with two set screws that go into the original belt grove. Quote Share this post Link to post Share on other sites
Wizcrafts Report post Posted January 2, 2018 You could buy a 3:1 speed reducer and a couple of new v-belts. This would divide the motor speed by 3 and multiply the torque by the same ratio. Alternately, if the motor pulley is over 2", see about replacing it with one that is under 2" diameter. If the original pulley is 4", a 2" pulley will cut the speed in half and double the torque. A shorter v-belt will be needed for a smaller pulley. Quote Share this post Link to post Share on other sites
Constabulary Report post Posted January 2, 2018 (edited) wow min. 500 rpm is quite a lot - my servos start at 200 rpm but they are made by JACK (or labeled JACK). and I run them with a 3:1 pulley speed reducer. I´m not electronic guy and I´m not sure if an additional electronic speed limiter would work at all in combination with a servo motor. However I once added a quite simple speed controller to my electric bobbin winders - but not sure if this works in combination with a servo motor. I think a pulley speed reducer would be the better idea as it even increases the torque. You probably have seen this video already on YT: Edited January 2, 2018 by Constabulary Quote Share this post Link to post Share on other sites
JeffHami Report post Posted January 2, 2018 (edited) 12 minutes ago, Wizcrafts said: You could buy a 3:1 speed reducer and a couple of new v-belts. This would divide the motor speed by 3 and multiply the torque by the same ratio. Alternately, if the motor pulley is over 2", see about replacing it with one that is under 2" diameter. If the original pulley is 4", a 2" pulley will cut the speed in half and double the torque. A shorter v-belt will be needed for a smaller pulley. Wiz, Where so I buy this 3:1 speed reducer? Does it mount under the table and do I have to move the current position of the motor? The unit has a 3" pulley Jeff Edited January 2, 2018 by JeffHami updated info Quote Share this post Link to post Share on other sites
Wizcrafts Report post Posted January 2, 2018 1 minute ago, JeffHami said: Wiz, Where so I buy this 3:1 speed reducer? Does it mount under the table and do I have to move the current position of the motor? Jeff All of the sewing machine dealers who advertise (top banners) with us have these speed reducers, as well as type 3L v-belts and different sizes of motor pulleys for various diameter shafts. The reducer has a mounting bracket that screws into the bottom of the table, next to the cutout for the belt. You feed one belt to from the motor to the large pulley and another longer belt up from the smallest reducer pulley to the machine pulley. The motor's positioning adjuster bolt is used to set the slack in its belt. The reducer mount has bolts that let you move it vertically a little to tension the top belt. Quote Share this post Link to post Share on other sites
JeffHami Report post Posted January 2, 2018 18 minutes ago, Constabulary said: wow min. 500 rpm is quite a lot - my servos start at 200 rpm but they are made by JACK (or labeled JACK). and I run them with a 3:1 pulley speed reducer. I´m not electronic guy and I´m not sure if an additional electronic speed limiter would work at all in combination with a servo motor. However I once added a quite simple speed controller to my electric bobbin winders - but not sure if this works in combination with a servo motor. I think a pulley speed reducer would be the better idea as it even increases the torque. You probably have seen this video already on YT: Just watched it thanks. I think I may go with this idea. Quote Share this post Link to post Share on other sites
dikman Report post Posted January 2, 2018 11 hours ago, JeffHami said: I was thinking it should be easy to put a speed limiter inline between the speed controler and the motor........ I'm no electronics guys , but this seems like something that could be made. Is there a reason this couldn't be done? Yes, there is a reason this couldn't be done - it would be a complex bit of gear. DC servos generally use Pulse Code Modulation to control the motor, such a controller is not something you can whip up quickly. I'm surprised that the minimum speed is 500 rpm as mine can be set much slower (different brand). There is a speed reducer that consists of an open box that bolts in place of the motor and the motor then bolts to the bottom of the box, with the reducing pulleys mounted to the box. Probably the simplest way to mount a speed reducer, I think some of the advertisers here sell them. Quote Share this post Link to post Share on other sites
JeffHami Report post Posted January 2, 2018 It looks like an electronic speed reducer is out so I decided to go with the Techsew speed reducer. I didn't want to mount all the pulleys and bearings on the top of the table and the Techsew had the smallest footprint and looks well made. Thank you to everyone for all the help and ideas. Quote Share this post Link to post Share on other sites
keithski122 Report post Posted January 2, 2018 A nice easy way to make a servo motored machine easier to use is to extend the arm on the pedal that attaches to the rod and also to extend the coresponding arm on the motor switch unit.This means your foot has to move further to speed the motor up.I've added an extra 2 to 3 inches to each of my machines arms. Quote Share this post Link to post Share on other sites
JeffHami Report post Posted January 3, 2018 4 hours ago, keithski122 said: A nice easy way to make a servo motored machine easier to use is to extend the arm on the pedal that attaches to the rod and also to extend the coresponding arm on the motor switch unit.This means your foot has to move further to speed the motor up.I've added an extra 2 to 3 inches to each of my machines arms. Thanks, I never thought of that. Quote Share this post Link to post Share on other sites
Constabulary Report post Posted January 3, 2018 (edited) But this does not slow down the motor it still starts at 500RPM min. In the accelerator unit you can move the small black lever a bit to the left or right to get more or less "play" in the foot pedal. Its a bit trial and error. Not sure if your look the same but I guess it does. Edited January 3, 2018 by Constabulary Quote Share this post Link to post Share on other sites
Gregg From Keystone Sewing Report post Posted January 3, 2018 (edited) I think I understand what you are are asking; you are looking to "add" a speed control knob or dial to an existing motor to be able to adjust the upper limit of the maximum speed. Either the motor has the ability to input this through the use of a potentiometer, such as some of the Efka motors, or you are going to have to be an electronic genius and be capable of making up something on your own for your specific model motor. I do not know of any digital brushless motors that have an input like this, and as said you can adjust in the motor parameters as per the instructions for your specific model. Other motors like the with brushes Consew CSM550-1 have a dial like this. Edited January 3, 2018 by Gregg From Keystone Sewing Quote Share this post Link to post Share on other sites
Gregg From Keystone Sewing Report post Posted January 3, 2018 On 1/1/2018 at 8:53 PM, JeffHami said: Wiz, Where so I buy this 3:1 speed reducer? Does it mount under the table and do I have to move the current position of the motor? The unit has a 3" pulley Jeff Yes, the motor will have to shift off to the side to accommodate the speed reducer. This is why a new setup with this is often a cleaner setup, if you can't deal with three extra holes where the motor was. Quote Share this post Link to post Share on other sites
JeffHami Report post Posted January 3, 2018 Gregg, What my original idea was to make a box that would go inline and limit the RPMs so I could run the machine slow no matter how hard I pushed on the pedal. After all the advice on the forum I decided adding the pulley was the best idea because it also increases the torque while slowing the machine speed. I am going to remove the machine and flip the table over then rework everything when the new pulley comes in. I hope to be able to buy the new belt sizes I need at my local auto parts store. Quote Share this post Link to post Share on other sites
Wizcrafts Report post Posted January 4, 2018 4 hours ago, JeffHami said: I hope to be able to buy the new belt sizes I need at my local auto parts store. Only if that store stocks type 3L v-belts. They are 3/8inch wide at the top. Most auto belts are 4L, or 1/2 inch wide. This is way too wide for industrial sewing machine pulleys. Quote Share this post Link to post Share on other sites
JeffHami Report post Posted January 5, 2018 22 hours ago, Wizcrafts said: Only if that store stocks type 3L v-belts. They are 3/8inch wide at the top. Most auto belts are 4L, or 1/2 inch wide. This is way too wide for industrial sewing machine pulleys. Is there a local store that might sell belts like Ace Hardware or a mower shop? Quote Share this post Link to post Share on other sites
Wizcrafts Report post Posted January 5, 2018 20 minutes ago, JeffHami said: Is there a local store that might sell belts like Ace Hardware or a mower shop? Unlikely, but possible. These 3/8" belts are mostly used on industrial sewing machines. Quote Share this post Link to post Share on other sites
mikesc Report post Posted January 5, 2018 In France you can get the right size belts from mower shops, so it is worth a try where you are..if you are using a smaller pulley, look for belts with teeth, they are able to get around the smaller diameter pulley better. Quote Share this post Link to post Share on other sites
JeffHami Report post Posted January 5, 2018 I've done a web search and found them at Tractor Supply https://www.tractorsupply.com/tsc/search/3L Type V-Belt and Granger Supply https://www.grainger.com/category/v-belts/power-transmission-belts/power-transmission/ecatalog/N-cc2Z1yzazhm If they don't work I'll try one of the sewing machine suppliers. Quote Share this post Link to post Share on other sites
JeffHami Report post Posted January 8, 2018 OK one last question on this subject. The new Techsew pulley will be in Thursday and I'll have to move the motor and mount the new pulley. Does anybody have any advice on what type of screws/bolts to use in the wood for mounting the motor and pulley? Quote Share this post Link to post Share on other sites
brmax Report post Posted January 8, 2018 (edited) I suspect some lag bolts or screws in 1/4” would come with the reduction pulley assembly. Thats what i would use in this case anyhow. I would carefully pilot drill a smaller diameter for the three mount holes. I believe in some historical post on the site here there is mention to have the reduction pulley center clearly mounted behind the sew machines, pulley center. On the motor if relocation towards rear is required I would still try and maintain the carriage bolts typically used. If needed, I have consistantly used fiberglass resin to repair holes and wood surfaces. Allthough this resin repair is only for non oil soaked wood. Good day Floyd ps: i would wait or look in the included items before buying anything. There may be better attachment fastening hardware included. Edited January 8, 2018 by brmax Quote Share this post Link to post Share on other sites
