Hi all, im looking for 2 stepper motors with a reasonably high holding touque (30Ncm/41oz.in) 3.8v 1 - 1.5 amps per phase. With a 5mm diameter shaft. As the teethed pully sprockets i have are 5mm bore. But i can only find shafts with 4.5mm dia. Or am i over thinking this. Would 4.5mm work with 5mm shafts?
Best Regards.
Dave
Try Ebay. They sell plenty off such steppers.
I dont use ebay. Only amazon. But thank you for your suggestion.
Dave
Even if you had the correct diameters, how are you going to strongly fasten the pulleys to the motor shafts so the motor torque will be transmitted to the pulleys without loosening?
Epoxy resin glue
Be sure the motor shaft is REALLY rough before the epoxy is applied!
Thanks, but iv done this a few times. Still need the steppers tho.
Pretty much every NEMA 17 size stepper on Amazon has a 5mm shaft. Some have the D shaped shaft so you can attach a pulley with set screws.
Any NEMA-XX motor should have the same mounting dims & shaft size as any other from the same series. If they didn't, they wouldn't be NEMA compliant ...
Everyone iv looked at have 4.5mm unless I'm looking at knockoff nema17s
I see what it is. You are looking at motors with the D shaft. The actual shaft diameter is 5mm, but the bit that is cut away to make the flat of the D is 0.5mm leaving 4.5mm. Look closely at the dimensioned drawing.
Wow your a life saver. Cant believe i missed that.
This is the one im look for. Its only £10 so i might get 3 lol thank you so much
Dave.
Get an extra one or two. Once you start playing with steppers, you find all kinds of uses for them. I play music with a couple for fun.
What drivers are you using? Please do not say L293 or L298. Those dinosaurs are not at all suited to drive modern bipolar steppers.
Yeah. I did that a few years ago with 12 3.5 floppy drives lol
I have a DRV8834 but i want to get 3 new ones as mine is a low powered driver. 10.8v max. Which was fine of messing about with. Can you suggest a better alternative? Perhaps a driver that can handle 3 steppers.
Dave
I don't know of any one driver that will handle 3 steppers by itself.
I have used the A4988 and DRV8825 drivers.
A4988 is good for up to 1A coil current (1.5A with heat sink and active cooling) and 8 to 35V motor power, up to x16 microstepping.
DRV8825 is good for up to 1.5A coil current (2.2A with heat sink and active cooling) and 8 to 45V motor power , up to x32 microstepping.
There are lots more like the TMC2209 (can be quieter) and TB6600 (up to 4A coil current).
What Arduino are you using? I like the CNC shield V3 for Uno as it will take up to 4 stepper drivers and has connections for limit switches and several control signals. Great for making plotters and such with grbl control
Yeah, my drv8834 is a drop in replacement for the A4988. Only difference is max power is 10.8v. I bought it not knowing about current limits and that i can pump about x5 the steppers rated voltage as long as i limit the current. I really do need to learn/workout what my current and voltages are so i can get a propper power supply. Currently im using a 12v 1.5a which powers my dc motor driver. Then a buck converter to get the 10.8 v for the stepper driver.
Im having so much fun with my project. I just wish i had the money to buy everything i need in one go.
Oh btw. Im using an Arduino Uno. With usb power so i have a 5v rail for logic.
Don't we all?
would the DRV8825 driver work in the CNC shield you posted? according to pololu its a drop in replacement for the A4988 using the alternative wiring diagram. not sure if I could use the minimal wiring tho as it uses the fault line for the 5+ logic.
You NEED a 3D printer to mount all that crap. You need to get away from breadboard and go to protoboard to solder to keep things alive. I see you've had to harness the long duponts to keep them from pulling on the breadboard. using a perfboard and soldering will help the project robustness. Looking good tho my man!
I picked up my 3D printer from Grizzly for $150 and have spent more on different color filament than I have on the printer. TinkerCAD lets you design mounts and things and then 3D print them in minutes. I can make anything that'll fit in 6x6x6 in cube. Its kinda Star Trek replicator but not as fast and without the flashy swirling lights. LOL
Mate. You've just mentioned Star Trek. Which now officially makes us friends. lol I would love a 3d printer but i can't justify getting one when this online service I found will print both my reel holders and 10 teeth sprocket for under £40. plus i have no clue how to design a 3d object for the printer. as for the perf board. i only have two 2inX3in boards left(size of the arduino uno). I'v only used the bread board as my wires wernt long enough and i had run out old solder at the time.(must remember to order some more when i order the new steppers. when you say i NEED a 3d print to mount all my stuff. do you mean the cnc shield? cos i though it just goes ontop the uno? i have a hobby box i was going to put all the gubbings in once its finished and all working. I would like to be able to use the lcd as well as the shield but it looks like i wont have any free pins left. perhaps i should of bought a mega?
Dave
