Emco PC turn 55 upgrade..

I have changed it, as well as changing the velocity and acceleration to their more optimum values of 2250mm/min and 750mm/s^2. I increased the max rpm in my .ngc file from 2000 to 3500, which I had reduced earlier. It now runs through the code most of the time. I get some chirping sounds coming from the spindle.

I believe part of the problem is with the code I'm running. Another problem is that I need to implement some kind of limit to the spindle acceleration. Look at the attachment at the top of the page. It looks to me like it is telling the machine to move at 800mm/rev, when it should be switching to G94 to tell it to go 800mm/min, and then back to G95 for the actual cutting at .18mm/rev. This is because I was trying to get rid of some errors with the Emco control by selecting "use high feedrate" instead of rapid in fusion. I will try redoing the cam with the rapids turned back on.

How big is your f-error limit, and how does that compare to the backlash setting?
I am wondering if there is a problem if backlash > f-error.

I have all of the f-errors set to .01mm now. Z backlash is .03 and the error had always shown up on the z. X is .016. I reposted the code I was running last night and I don't think I got any errors since then. I turned off "use high feedrate" in the cam, and it didn't change those moves to G0, but it did change them to a reasonable feedrate of 1mm/rev.

Does f-error have anything to do with how the machine follows the toolpath, or is it simply a limit that causes the machine to stop when exceeded?

You can hear the spindle chirping when it's trying to change speed to fast.

turbo wrote: Does f-error have anything to do with how the machine follows the toolpath, or is it simply a limit that causes the machine to stop when exceeded?

It is just a limit that triggers an error. And I do rather suspect that the system might need the f-error limit to be > backlash magnitude.

jmelson wrote: No reason to use output from the VFD, the spindle encoder will be the most accurate.

Limiting spindle acceleration should be done by putting a lowpass or limit HAL component between motion.spindle-speed-out and whatever sends the analog voltage to the VFD.

Jon

Could you please elaborate on limiting the spindle accel?

turbo wrote: Could you please elaborate on limiting the spindle accel?

Typically that is a ramp-time setting in the VFD menus.

I don't think there is any way to access the VFD programming without an add on module or special programming. I'm pretty sure I'm going to have to do it in hal.

turbo wrote: I don't think there is any way to access the VFD programming without an add on module or special programming. I'm pretty sure I'm going to have to do it in hal.

OK, in that case look at the limit3 HAL component.

Hello,
i have a 99`pc turn 55 too and want to upgrade the machine too. can you explain me which components did you choose on your machine and what do i need (hardware) to upgrade them?

kind regards
Andy