i fear you have some home direction wrong , it's simply a question of changing the sign of the homing values in the ini , but it does take some practice to set up if your direction is wrong to start with it makes it complicated to work out any you wonder why your making a - value for a positive move so i make sure the direction for the machine is correct first in that the dro's are correct and they move in a positive value towards the tailstock . sometimes it needs the stepper drive wiring to be changed , but once the directions are correct the homing falls into place nicely
On 17 September 2014 15:01, <p...@wpnet.us> wrote: > The spindle runs properly (except for the sudden reverse issue) in the > PnCConf open loop test. Enable, direction and control voltage all work > peoperly, I can change the control voltage output and get the expected > speeds from the VFD. There seems to be some disconnect / misconfig in > getting it to LinuxCNC. I'm also anything but clear on the settings for the > spindle encoder (A and Index) for threading. > > The toolpost is low on my priority list at the moment since I can hack it > and control via the pseudo-A axis enough to change tools for now. Really > just advance it enough degrees to get past the ratchet pawl, then back up a > bit to seat on the pawl (and stall the stepper). > > I tried to get it to home in the positive direction and that works to a > point, but it wants to make that home location zero instead of the max axis > travel such as 18.0 and as a result if the home position is set as 18 it > will just blindly run away looking for that in the positive direction to > overtravel. It needs to find home and set that location *as* 18 and call it > good, not set as 0 and look for 18. > > Thanks, > > Pete C. > > > ------Original Mail------ > From: "David Armstrong" <cncbas...@gmail.com> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Sent: Wed, 17 Sep 2014 14:38:31 +0100 > Subject: Re: [Emc-users] New to LinuxCNC and PnCConf and need some help... > > Pete , > have you conneced spindle-enable ? this should stop the problem > i use a second relay in the common line of the direction relay > > theirs not so much information on turrets , although it can be done using > classicladder , i find is easier to use a component and have linuxcnc know > what tool is current via the feedback from the proximity switches .. > > see the components for the emco and triac toolchangers in the wiki , they > can easily be changed to suit your particular type > > see Jt's page for using a turret as per his hcnc conversion . > http://gnipsel.com > > to reverse homing use negative numbers in the homing section of the ini > but beware it can get confusing if you change the major direction , so make > sure the > dro's count in the correct direction first > > > > > > > > > > > > On 17 September 2014 13:59, <p...@wpnet.us> wrote: > > > 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 > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > ------------------------------------------------------------------------------ > 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 > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > ------------------------------------------------------------------------------ > 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 > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
