My first project I used the stepper3+1 from stepper3.com and bought their motor nema 23 5.1 volt 1 amp 5 ohms
After reading many threads on how the motor should be run at at least 4x the rated voltage. I also understand three types of current control, resistors/transistors/ and chopper drives. This system I have is locked in to full steps and thus I have some resonance problems at higher speeds and I am thinking maby because I am running it at 5volts that is a major problem.
I would like to try the 12 volt supply I have but I have a question or two.
The information stepper3 gives on using a resistor says the resistor should be connected to the center tap of the coil. However there are 2 coils and 2 center tap connections. It seems I need 2 resistors but I can see a problem that if two seperate resistors are used that are not exactly the same ohms, I would have a problem as this is how microstepping is done.
So the question, can I use a power resistor in series with the power supply terminals on the board. (each motor connsction has its own set of terminals for motor power on this board)
Question 2. If that is ok, would I use the resistor on the + side or the - side.
My next Motor/driver will be from Salem controls as they have microstepping and sell all the components motors/breakoutboards/drivers/power supplys and wiring and a very easy to understand web site that makes it easy to select what you need. As I am new to CNC buying everything from one source that works together is a nice way to do it.
I have looked at the Gecko G901 Step Pulse Multiplier at $39.00 as perhaps an add on board that would give the system I have microstepping but I am not sure if it will work with the driver board I have or if it is just for other Gecko drives. I dont really need any more speed on the system I have built now but the resonance and loudness of the full steps just dosen't sit right with me.
I am almost done with the X table and I will post some pictures when I am finished.
I have a project I would like to do that I need to lift about 200 lbs vertical in increments of about 1/4 inch. Its a sheet stacker I want to be able to index it down while filling it and then index it up while unloading it. I am thinking a cheap way would be to use an air cylinder and a ratchet and prawl setup instead of motor and reducer that runs almost a grand. Any suggestions on how to do this project on the cheap would be appreciated.  |