Timeline for Sewing machine speed and needle position control over arduino
Current License: CC BY-SA 4.0
14 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 3, 2019 at 15:15 | comment | added | jsotola | @vugar_saleh, your english is just fine .... i am the one that is the problem ... i was visualizing what you are trying to do and i imagined the wrong thing from the start | |
| Nov 3, 2019 at 8:04 | vote | accept | vugar_saleh | ||
| Nov 3, 2019 at 7:53 | comment | added | vugar_saleh | @jsotola may be I can't explain clearly, sorry for my broken english. But Chris Stratton understand me 100% percent ) One of main think is I need - control speed of sewing and stop needle every time in down position. But after understanding all processes, I think this is out of my capacity. One of main problem, as you said, will inertia, which is calculating almost imposible.But peufeu 's advice in his practice, I think most fit my plan. - use "PWM like 10-20 kHz through a MOSFET". I hope, this PWM will provide smooth low speed and stable torque. I'm thinking on this case. | |
| Nov 3, 2019 at 1:04 | comment | added | Chris Stratton | @jsotola - contrary to your false assumption, I (and presumably the other commenters as well) know and specifically responded to exactly what the asker needs, the ability to stop the needle up, or down. No one who has used a sewing machine would have been the least bit confused about that! The asker probably won't be able to both sew and do that at a single speed, especially on cheaper home machines that rely on flywheel inertia compensate for weak motors. Machines that can be set to stop up or down do the final vertical positioning more slowly than sewing speed. | |
| Nov 2, 2019 at 15:15 | comment | added | Chris Stratton | Using comparable voltage DC is even more hazardous than AC. This is just not a good project, and it's not going to work single speed because you can't position the needle at a speed you can sew at. | |
| Nov 2, 2019 at 8:13 | comment | added | vugar_saleh | @ChrisStratton Thanks you for detailed comment. In worst case I will use triac dimmer with manual rheostat,it means fixed motor speed, but needle position will controled. Like this project: youtube.com/watch?v=yFy6KSMqnZM&t=576 But I wanna project like this (without Embroidery) but speed controlled by programmatically. What is your opinion about use PWM instead of triac dimmer? | |
| Nov 2, 2019 at 1:39 | comment | added | Chris Stratton | There's really no easy, safe way to do triac control from an Arduino. A finished appliance would possibly float the MCU at mains voltage (while isolating it from the user) but that grossly complicates debugging and is just plain not acceptable for a hobby project. Otherwise you need an opto-coupler on the zero crossing detector, and probably an opto-triac to drive the power triac. And of course an isolated supply to power the MCU. In terms of realistic advice, the extreme degree of interaction with the mains means you should drop this project and pick something else to work on instead. | |
| Nov 2, 2019 at 1:34 | comment | added | Chris Stratton | @DKNguyen home-grade sewing machines use brushed universal motors, not induction motors (as industrials may use) and triac control is indeed the successor to the original rheostats. Fancier ones probably have servoed brushless motors. | |
| Nov 2, 2019 at 0:11 | answer | added | bobflux | timeline score: 1 | |
| Nov 1, 2019 at 23:15 | review | Close votes | |||
| Nov 16, 2019 at 3:05 | |||||
| Nov 1, 2019 at 22:04 | comment | added | user16324 | Sewing machines are traditionally brushed motors offering speed control right down to 0. That kind of speed control is probably rather dangerous to hack : it probably isn't isolated from mains. The Arduino won't like that... | |
| Nov 1, 2019 at 20:57 | comment | added | DKNguyen | Q2: The most common type of AC motor, an induction motor, cannot be controlled this way since voltage and frequency affects speed (not only does the 220AC from the wall affect how fast it turns, but so does the 50/60Hz.). To control its speed you have to basically make a custom sine-wave which is very, very involved. You cannot speed control induction motors like a DC brushed motors. But I don't know what type of motor is used in a sewing machine. | |
| Nov 1, 2019 at 20:55 | review | First posts | |||
| Nov 2, 2019 at 3:59 | |||||
| Nov 1, 2019 at 20:54 | history | asked | vugar_saleh | CC BY-SA 4.0 |