Gallery, Projects and General > Project Logs
Sewing Machine Modifications
efrench:
It depends on the driver and microprocessor. A Teensy 3.6 microprocessor using the TeensyStep library can do 300000 steps per second.
awemawson:
. . . all very well but can a NEMA17 stepper motor keep up with that step rate, that was the point at issue :scratch:
S. Heslop:
Just reassembled the head area of machine at nearly 4am, since i'd forgotten to actually measure the amount of travel on the rod that connects the needle bar to the zig-zag mechanism. It moves about 2mm for the whole 6mm sitch width.
I better say right now that i've got little knowledge on stepper motors or electronics in general, but looking at the Numbers of the steppers used in sewing machines (I found some part numbers, PM42L-048-HHC9 to be specific) against the usual hobby CNC nema stuff it seems they have less steps per revolution but alot more holding torque. Most sewing machines i've found photos/ videos of being disassembled gear the motors down, which seems sensible with that 2mm of travel.
Also am I right to assume that any bipolar stepper motor driver with the right current & voltage rating would run any bipolar stepper motor? I've got a bunch of drivers hanging about. Lyn sent me a few and i've got some A4988s from the 3d printer adventure.
efrench:
--- Quote from: awemawson on April 02, 2019, 02:09:55 PM ---. . . all very well but can a NEMA17 stepper motor keep up with that step rate, that was the point at issue :scratch:
--- End quote ---
The linked site has a few videos of one doing just that. :beer:
efrench:
--- Quote from: S. Heslop on April 02, 2019, 10:58:42 PM ---
Also am I right to assume that any bipolar stepper motor driver with the right current & voltage rating would run any bipolar stepper motor? I've got a bunch of drivers hanging about. Lyn sent me a few and i've got some A4988s from the 3d printer adventure.
--- End quote ---
This spreadsheet may be of some use.
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