[DistortedDesign]

Ok, I so suck at math. I am setting up mach3. I am trying to figure out what microstep I should be running, acceleration curve, tpi, ect. I been looking at the formulas but I seem to be getting lost. Part of it is I don't know the max rpm of my steppers. I will give you as much info as I can. Any help would be great.

I am running a Joes's 2008 r-2
x-y screws are 1/2" - 5 start - 2 tpi
z screw is 1/2" - 2 start - 5 tpi

My steppers are Keling 425oz-in unipolor motor 8 lead wired in bipolar parallel
1.8degree / 2.8A / 6.8 inductance

I have Keling 4030 drivers

So I will only sending 2.7A @ 36v to the motor. My power supply will go up to 40v but that is the max that the 4030 can take and I was worried about back emf so I left it at 36v.

What microstep should I run at? 1/8th, 1/4th on x&y? What on the z?

What is the max rpm of my stepper? I am not sure about how many steps per inch. (motor steps x tpi x micro) (200 x 2 x 8)= 3600 steps per inch @ 1/8 microstep?

What Frequency should I run at. My cnc pc is pretty decent but I know it is related to the steps per minute.

What acceleration curve should I use? IE ramp up/down time. What should my acc curve be once I make stepper dampers? I know you have to allow a little more time but how much?

Will I have rapids of 120-150 ipm?

I am just trying to put in the necessary info into mach3

[ger21]

There is no "max rpm" that works for all machines. Stepper motors lose torque as rpm increases, and you need to do some testing to figure out what works well for your specific machine.

Use 1/8 microstepping for all axis. It should give you the smoothest motion.
Steps/unit:
X and Y = 3200
Z=8000
Set the frequency to 25,000.

To figure out a safe acceleration, I'd first set all the axis accels to 5, and the velocities at 100. While in the motor tuning screen, you can jog the motors back and forth with the up and down arrows. Keep increasing the velocity in small increments until you get stalling. Then back off 15-25% for a safety margin.
Once you have the velocity set, start increasing acceleration until you see stalling, then again, back it off by 15-25%.

Adding dampers may actually allow you to increase acceleration, but you won't really know until you try them. Some machines don't work any better with dampers, while some see a large improvement. It all depends on whether or not resonance is an issue with your machine.

[DistortedDesign]

Looks like I am screwed anyway. My computer didn't have a parallel port like most computers now. The only one I could get was a PCi express card, well it only has 3.5v. Also the card supports EPP mode but no way to force it to use it. What do I do now??

Jason

[ger21]

Just get a breakout board that works with 3.3V parallel ports.
Standard parallel port mode should work fine, I think.

[DistortedDesign]

I found a 5v parallel card on newegg for $15. I will prob just ise an older computer to run mach and do the design work on a better pc.

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