Also I'd like to hear opinions from you guys as to the idea of using limits in a serial fashion on a single pin to the IO board. My last machine had optical limits and while they were super nice and accurate they were kinda prone to noise issues and wiring them up was a beotch... I know that was on a smaller machine with 5vdc control wiring and this will be commercial switches on 24v circuits and should be much less prone to noise issues. Not being all that familiar with linuxCNC is this the preferred method or should I be looking at a different route? The machine has apparently limits on each axis in both directions so a switch for each end of travel and I think one is used intermittently for a home with some computer wizardry or at least that is how it worked on my Mach3 machine. Any ideas in this regard would also be most apppreciated. Thanks guys...peace
Pete On Tuesday, February 12, 2013, Pete Matos <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 >>>> [email protected] >>>> 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 >>> [email protected] >>> 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 >> [email protected] >> ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
