Retrofitting a TOS FNG 32 NC

Henk wrote:

Chek your .ini file settings to make sure you have it set for + and - control and not 0 to some positive value.
 

This is the values for the spindel in .ini

[SPINDLE_0]
P = 15
I = 0
D = 0
FF0 = 1
FF1 = 0
FF2 = 0
BIAS = 0
DEADBAND = 0
MAX_OUTPUT = 2000
OUTPUT_SCALE = 2000
OUTPUT_MIN_LIMIT = -2000
OUTPUT_MAX_LIMIT = 2000


 

Yes.

It seems like if I run the spindle at the lowest speed it will slowly ramp up and run very fast in about 10 seconds. I think some setting is making my Mesaboard output 10v.

I also started to work with Classicladder. Having trouble to save and open previous files. When I start LinuxCNC with CL I only see a blank space in "Sections Manager" and dont know how to acces my ladder program I just created and saved.


 

In your .ini file, make the spindle P zero. I doubt that you have a spindle encoder set up at this moment, so it will be zero and the PID will increase the output to try and reach the speed setpoint. With P=0 and FF1=1, the PID does nothing, just passes the input to the output, which is what you want if there is no feedback set up.

Then play with the OUPUT_SCALE value to calibrate the actual speed if you have something at hand to measure the actual speed. Otherwise measure the tacho feedback voltage from the motor. It should be 20V/1000RPM but could be something else.

When LCNC is running, switch on the spindle, then open a terminal and type "setp [HMOT](CARD0).7i77.0.1.analogout5-scalemax xxxx"
where xxxx is the new value you want to test. you may have to replace the "[HMOT](CARD0)" with the actual card description as it appears in hal configuration.

Right, there is no encoder feedback.
It's working now. With P=0 and FF0=1
Thanks.

Forgot to mention above, once you figured out the output scale value using the halcmd approach, ypu need to updatw your .ini file manually with the correct value and save it.

I would put "EP1" relay in the spindle enable string to avoid this problem. Lack of field on spindle startup will draw max current and not start. Field loss at speed is even worse, it will get you a runaway condition. DC motors will throw windings at over speed.

I tried to cut some chips today. It works really good. 
Still some things to do of course like programing the buttons. Everything is plugged in and I can see that I get the signal when I push the button. 

I did about 2 hours of milling and noticed that Y-motor is getting really hot. So hot that the paint is melting so that's something that needs to be fixed. There is some backlash in Y so you can hear the motor always going back and forth all the time, I don't know if this is the reason. X motor is also quite hot, I don't think its too hot though.  Z is only a bit warm.