Okay another point I am missing, if you have your limits tied into the estop to depower the entire system how the hell do you home the machine? Do you have seperate home switches. I intend to use to the limits as homes for the purposes of homing the machine.
On Tue, Feb 12, 2013 at 11:44 AM, Pete Matos <petefro...@gmail.com> 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 ( 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! 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