I have a Harrison T280 lathe I am retrofitting to LinuxCNC. This is a stepper
driven machine, the original controls were previously retrofitted with
MicroKinetics stuff and I'm re-retrofitting with LinuxCNC and Mesa 5i25 / 7i76
while keeping the MK stepper drives.
I did a clean install of 2.6.3 from a USB drive image. I'm new to LinuxCNC and
PnCConf and while I'm making progress getting things going I'm running into a
few issues I haven't yet found answers to in the docs I've found so far.
Issues so far:
1. The biggest issue currently - After some fiddling I have the Hitachi VFD
controlled spindle operating in the PnCConf open loop test where I am able to
run it forward and reverse at various speeds. I have the spindle encoder
connected (A and Index only, not sure on CPR currently) and in HALscope I can
see the A pulses and index pulse. I haven't been able to get the spindle to
operate in LinuxCNC however no matter what I've tried. Another issue I have
found is that when running in reverse and stopping, LinuxCNC drops the
direction line before the VFD has completed the decel ramp, causing the VFD to
slam the lathe into forward for the duration of the decel, obviously not a
desirable thing.
2. I've got the axis homing working in the direction it seems to want to run,
i.e. in the negative direction, however this seems like a bad idea on a lathe
to me. If I have a part in the spindle and need to re-home for some reason,
something not unexpected on a stepper machine, homing in the negative direction
will crash the toolpost into my part. It would seem better to home in the
positive direction and "zero" to the max travel of the axis. I haven't figured
out how to do this.
3. The lathe has an 8 position unidirectional stepper driven tool turret with a
home switch. I currently have the stepper drive wired to stepgen 2 (0=Z, 1=X).
I was able to configure an A axis so I can manually move the torret, but I've
not found any docs so far that give me much of a starting point to figure out
how to configure the tool turret properly for automatic changes.
Thanks,
Pete C.
------------------------------------------------------------------------------
Want excitement?
Manually upgrade your production database.
When you want reliability, choose Perforce
Perforce version control. Predictably reliable.
http://pubads.g.doubleclick.net/gampad/clk?id=157508191&iu=/4140/ostg.clktrk
_______________________________________________
Emc-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/emc-users
