Ron,
That should be quite simple then, and if I give you bum advice, I'm sure Tom or one of the other guys will speak up. You'll want to use axis channels 0-2 for your three axes, and map those to output channels 8-10. Open KMotion, and click on "Config & Flash" on the menu bar. To setup your X axis, do the following, working our way down the dialog:
Make sure Channel is set to "0"
Set Encoder to "No Input"
Set OutputChannel to "8"
Click "C-Code->Clipboard"
Open Notepad, and paste the clipboard into a new document
To setup your Y axis, do the following, working our way down the dialog:
Make sure Channel is set to "1"
Set Encoder to "No Input"
Set OutputChannel to "9"
Click "C-Code->Clipboard"
Go back to Notepad, and paste the clipboard to the end of the file you created above
To setup your Z axis, do the following, working our way down the dialog:
Make sure Channel is set to "2"
Set Encoder to "No Input"
Set OutputChannel to "10"
Click "C-Code->Clipboard"
Go back to Notepad, and paste the clipboard to the end of the file you created above
Save the Notepad document to any convenient location as "Init.c"
Now look at the code in Init.c. Add the following to the top of the file:
main()
{
and add a closing } after the last line of the file
Now look at the code you pasted in. You'll see each code block is setting axis configuration values for one axis, referenced as "ch0", "ch1", and "ch2". Most of these values do not need to be understood, but two of them do: "Vel", "Accel". "Vel" and "Accel" are critical. "Vel" specifies max velocity, in steps/second, "Accel" specifies max acceleration, in steps/second/second. Note the DSP itself has no concept of inches or mm, just steps or counts. Assuming you know your current max velocity (in inches/minute)and max acceleration (in inches/sec^2), you can convert these as follows:
Vel = (MAXIPM / 60) * STEPS/INCH
Accel = MAXACCEL * STEPS/INCH
So, your STEPS/INCH appears to be 200 * 4 * 12 = 9600
If your max velocity is 100 IPM, set Vel to 16,000
If your max acceleration is 25 in/sec^2, set Accel to 240,000
Do these calculations for each axis, and edit the new values into the appropriate init code block in your Init.c.
Save your Init.C, and go back to KMotion, and open the "C Program" dialog. Click on "Open", and select your Init.c. Once it's loaded, make sure your KFlop is plugged in and intialized, then click on the icon above the edit window on the far right - the one with all the arrows. This will compile, link, and load your init.c into the DSP. If there are any errors in your code, a dialog will pop up telling you where the problem is.
Once you have your code loading without error, hook up your drives. You'll want to connect them as follows:
XStep to P7 Pin 8
XDir to P7 Pin 9
YStep to P7 Pin 10
YDir to P7 Pin 11
ZStep to P7 Pin 12
ZDir to P7 Pin 13
Now go back to Kmotion, and open the Step Response dialog. Using this dialog, you can jog the axes, to make sure everything is working as it should. Most of the settings on here don't apply to you, so you can ignore them. The only ones you need care about are the Channel selection at the top center, the Motion Profile V(elocity) and A(cceleration) settings on the left middle, and the Step Time and Size settings on the lower left. Honestly, I don't even recall how this works, and don't have my board handy to try it, but it's pretty obvious once you play with it. Enter values, Click on either Step or Move, and the axis should move the specified number of steps. I wouldn't do anything more than just ensure you CAN move all three axes.
Assuming you got all three axes to move, open KMotionCNC, and click on ToolSettings->TrajectoryPlanner, and set the Counts/inch, Velocity and Accel for the X/Y/Z axes. Then go to ToolSetup->UserButtons, and setup the first UserButton to run your Init.c on Thread 1.
Click on the Init User Button, and I think you *should* be up and running.
Regards,
Ray L.
--- In DynoMotion@yahoogroups.com, "Ron" <ron.dunn@...> wrote:
>
> Thank you for your help, Ray.
>
> My machine uses step/dir signals to the drivers. The pulse width is at least 5us, and the driver uses negative logic.
>
> The drivers are currently set for quarter-stepping, I could change this if necessary.
>
> The screws are 12tpi, single start.
>
> I don't care whether the controller runs in mm or inches, I can fix that in gcode.
>
> I have no requirements for spindle control, coolant, limits, or anything like that.
>
> This should be as simple as you can get and still have a 3-axis CNC :)
>
> Ron.
>
