Maho 700C A-axis (rotating table)

Hi all. I’ve converted my maho 700 over to Linuxcnc using a lot of information from Mark (rotary smp). I need some advice or guidance.  So all 3 axis are working and I’ve managed to figure out and get the PID tuning running smoothly. At 1000/mm.s 
im struggling with the A axis which uses a Heidenheim scale. 
1. What scale settings do I give it or how do I workout the scale value of the a axis. 
2. When the clamps are release and the scale is plugged in and the NC- ready is on its almost as if the mesa card sends out a voltage causing the motor to “bump” which causes a joint error. If I unplug the scale and still leave the clamps off the machine runs fine and the table is steady doesn’t drift. 

3. What or how can I get the spindle to be steady? Again of the plug is unplugged from the mesa card the spindle doesn’t “spin” but when plugged in it moves slowly like maybe .5 of a rpm sort of a drift. 

4. Are you somehow feeding a Tacho signal to the mesa card so it can control RPM? Or are you just basing it off the calculation? And how do you get more range so I can run it from 0-6000 rpm. 

5. Might be a silly question this is really a hobby for me. But what is a max MM/S for these machines? Trying to get the max set but don’t want to cause any damage. 


I haven’t worked on the gearbox settings yet just want to figure out the axis first. 

Regards 
Sven 
 

2. When the clamps are release and the scale is plugged in and the NC- ready is on its almost as if the mesa card sends out a voltage causing the motor to “bump” which causes a joint error. If I unplug the scale and still leave the clamps off the machine runs fine and the table is steady doesn’t drift. 

If this is a analog system and you prevent motion, Normally you would need to disable the PID
feedback when locked (especially if there is any I term)  Otherwise a large output can develop
as the PID "fights" against the apparent resistance to motion.

Thanks I’ll be sure to check this.

Yes I don’t do that. Machine always off.

Yes I’ve done that also in pnconfig. Then you can just select XYZ /XYZA


The TRK6 4-U uses its own internal Tacho system/signal it just receives an external 0-9V signal to power the spindle. Now I don’t know if people tap into that 15V Tacho signal somehow. I know of Marc’s post there was someone that retro fitted an encoder on the spindle motor, assuming that’s for being able
To tap?