On 2/12/2013 10:44 AM, Pete Matos wrote: > Sam, > okay now we are getting somewhere, you bring up a valid point here. I > have been in that situation before with a runaway servo and buddy it is no > fun. I can see what you mean about getting the drive depowered in the event > of a runaway. I guess I was more thinking about a limit trip during a > program run accidentally when I screwed up the program placement or > overestimated the size of my travels again - in linuxcnc - it will not allow you to get to the limit switches because of the soft limits...
> ( I NEVER DO THAT REALLY!! LOL) so > yeah I can see your point and I wonder if there is a happy medium somehow > with a limit setup tied to the estop circuit and still being able to power > up and jog off the damn switch so I can get back to work without major > machine disassembly... You would think that would be kinda the way things > are done really. I am right now talking with Machmotion about my servo > drives and amps and should be draining my paypal account momentarily LOL... > we shall see how that goes. Peace > > Pete > > > On Tue, Feb 12, 2013 at 11:31 AM, sam sokolik <sa...@empirescreen.com>wrote: > >> Ok - I will say a couple more things and then shut up about it. :) >> >> - On conventional machines (not robot arms or such) the linuxcnc soft >> limits are rock solid. After the machine is homed - they work 100%. >> (again - I have never hit the limit switch when the machine was homed) >> If you may be used to another machine control software which shall be >> unnamed which may not be as consistent - you don't have to worry about it. >> >> - It really is a safety thing. what happens if the servo drive runs >> away towards the limit switch? (encoder failure or some such failure >> mode) Do you really want the servo drives enabled still when it hits >> the physical limit switch? (I know I want the estop to trigger and kill >> power) Your Cincinnati isn't a hobby machine run with small steppers. >> You probably have tons of force that would slam into the hard limits - >> then maybe smoke other things.. >> >> - You could setup a button that then allows you to enable the drives to >> jog off the limit switches. (again - it should happen never) >> >> sam >> >> >> >> >> On 2/12/2013 10:03 AM, Pete Matos wrote: >>> Well that may work fine for you and honestly I love soft limits as much >> as >>> the next Guy but I honestly prefer to have the drives enabled in a limit >>> switch trip situation so I can just backoff,backup and punt my way back >>> into the program. It worked fine that way on my RF45. If I have my way >> I >>> will have both hard and soft limits working continually and the estop >>> shutting down the show in an emergency situation. So I appreciate all >> the >>> ideas here but can we kinda keep the ideas pointing in that direction so >> my >>> already befuddled mind does not get any more befuddled than it has to be. >>> LOL thanks guys....peace >>> >>> Pete >>> >>> >>> >>> On Tuesday, February 12, 2013, sam sokolik <sa...@empirescreen.com> >> wrote: >>>> We have a brake on the y axis also. Yes it is a pain. :) I should >>>> disable the jog until after the machine is homed. Problem fixed. :) >>>> >>>> sam >>>> >>>> On 2/12/2013 9:43 AM, Pete Matos wrote: >>>>> That would be a real bitch to have to back off a millhead on a VMC off >> a >>>>> limit with a motor brake installed... >>>>> >>>>> Also as per the complete power down issue, having been ringside >> when >>> my >>>>> Y axis drive blew and watching the bright white light coming from >> behind >>>>> the machine I was VERY glad the estop circuit cut all power to the >> drives >>>>> LOL....yeah I am good with watching the spindle coast to a stop any >>>>> day....peace >>>>> >>>>> Pete >>>>> >>>>> On Tuesday, February 12, 2013, sam sokolik <sa...@empirescreen.com> >>> wrote: >>>>>> My axis limit switches are hooked directly into the estop loop. I >> have >>>>>> soft limits setup. The only time I have ever run into the over-travel >>>>>> limits was when I was jogging before homing (not paying attention... ) >>>>>> (and yes - I have to back off the limit manually) >>>>>> >>>>>> sam >>>>>> On 2/12/2013 9:07 AM, andy pugh wrote: >>>>>>> On 12 February 2013 14:53, Pete Matos <petefro...@gmail.com> wrote: >>>>>>>> Thanks for the info...can you explain that last part 7i77 GPIO? >>>>>>> The 7i77 has 32 inputs and 16 outputs for general-purpose IO. (on TB7 >>>>>>> and TB8 I think). >>>>>>> >>>>>>>> Did I hear you correctly when you said you wired your limits and >>>>>>>> homes in series and in with the estop circuit? >>>>>>> No, as you say that would cause problems with backing off of a limit >>>>> switch. >>>>>>> In actual fact the machine I am describing doesn't yet have limit >>>>>>> switches, it is a bit of a slow-burning project. They are likely to >> be >>>>>>> added fairly soon, though. >>>>>>> However, my intention is to keep them entirely software-controlled. I >>>>>>> would be interested to hear opinions on the advisability of this. >>>>>>> >> ------------------------------------------------------------------------------ >>>>>> Free Next-Gen Firewall Hardware Offer >>>>>> Buy your Sophos next-gen firewall before the end March 2013 >>>>>> and get the hardware for free! Learn more. >>>>>> http://p.sf.net/sfu/sophos-d2d-feb >>>>>> _______________________________________________ >>>>>> Emc-users mailing list >>>>>> Emc-users@lists.sourceforge.net >>>>>> https://lists.sourceforge.net/lists/listinfo/emc-users >>>>>> >> ------------------------------------------------------------------------------ >>>>> Free Next-Gen Firewall Hardware Offer >>>>> Buy your Sophos next-gen firewall before the end March 2013 >>>>> and get the hardware for free! Learn more. >>>>> http://p.sf.net/sfu/sophos-d2d-feb >>>>> _______________________________________________ >>>>> Emc-users mailing list >>>>> Emc-users@lists.sourceforge.net >>>>> https://lists.sourceforge.net/lists/listinfo/emc-users >>>>> >>>>> >>>> >> ------------------------------------------------------------------------------ >>>> Free Next-Gen Firewall Hardware Offer >>>> Buy your Sophos next-gen firewall before the end March 2013 >>>> and get the hardware for free! Learn more. >>>> http://p.sf.net/sfu/sophos-d2d-feb >>>> _______________________________________________ >>>> Emc-users mailing list >>>> Emc-users@lists.sourceforge.net >>>> https://lists.sourceforge.net/lists/listinfo/emc-users >>>> >> ------------------------------------------------------------------------------ >>> Free Next-Gen Firewall Hardware Offer >>> Buy your Sophos next-gen firewall before the end March 2013 >>> and get the hardware for free! Learn more. >>> http://p.sf.net/sfu/sophos-d2d-feb >>> _______________________________________________ >>> Emc-users mailing list >>> Emc-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/emc-users >>> >>> >> >> >> ------------------------------------------------------------------------------ >> Free Next-Gen Firewall Hardware Offer >> Buy your Sophos next-gen firewall before the end March 2013 >> and get the hardware for free! Learn more. >> http://p.sf.net/sfu/sophos-d2d-feb >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > ------------------------------------------------------------------------------ > Free Next-Gen Firewall Hardware Offer > Buy your Sophos next-gen firewall before the end March 2013 > and get the hardware for free! Learn more. > http://p.sf.net/sfu/sophos-d2d-feb > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ Free Next-Gen Firewall Hardware Offer Buy your Sophos next-gen firewall before the end March 2013 and get the hardware for free! Learn more. http://p.sf.net/sfu/sophos-d2d-feb _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
