Something I learned along time ago from the guy I learned a lot about when it comes to machine repair and rebuild,
"You can't fix Stupid" Regardless of how hard you try, some idiot will always find a way around safeguards, regardless of how elaborate they are. Rick -------- Original Message -------- Subject: Re: [Emc-users] Modifying homing From: "Nicklas Karlsson" <nicklas.karlsso...@gmail.com> Date: Wed, April 13, 2016 4:03 pm To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Idiot proof are these doors in front of machine so you can't stick your hand inside. One of my relatives worked three days in factory then tool cut thru his hand! On Wed, 13 Apr 2016 15:43:59 -0400 Dave Cole <linuxcncro...@gmail.com> wrote: > OK.. I get it. > > Generally this falls under the "idiot proofing" category of machine control. > > The only positive aspect of this is that if you forget to idiot proof > any aspects of the machine, the idiots will > find those deficiencies and then blame you for "allowing them" to do > ______ which destroyed _____. > > Good Luck! > > Dave > > On 4/13/2016 2:43 PM, dan...@austin.rr.com wrote: > > Sure, estop is an option. But this is a large machine in a shop open to > > many users. Really I'm thinking the whole idea of a "home" button you > > could press once and walk away is less safe than... I guess we're calling > > it "deadman homing" now. > > > > I try to think of real-world use. Heard of plenty of cases where someone > > was doing touch-off and forgot to lay out the touch-off plate and > > everything looked fine until the tip started jamming into the table. If > > it's automated without deadman, the process becomes "oh crap oh crap it's > > doing that thing what do i do where's the estop it's right here ok press > > it". Reaction time for such an unexpected outcome is near-instantenous if > > you're consciously holding down a button, "oh cra..." and you let go > > reflexively, typically. You don't have to find the button at all, just let > > go. I think the act of releasing a button would be done quicker in the > > real world than an active press, even if a person had already pre-hovered > > their finger over the e-stop. > > > > Danny > > > > ---- Dave Cole <linuxcncro...@gmail.com> wrote: > >> That's what the E-Stop button is for. Until you have homing nailed > >> down, you should keep your hand over the E-Stop button while running > >> risky procedures. > >> > >> Also, there is no reason why you need to home close to a hard stop when > >> first testing software. Move your home switch so it makes well before > >> you hit a hard stop so you have some time to take > >> corrective action to prevent a machine crash. Or put a cardboard box > >> under the Z axis so it hits the cardboard first and trips. If it keeps > >> going through the cardboard you have some time to hit the E-Stop before > >> tweaking your Z axis. Also, slow down your homing routine so you have > >> more reaction time. Then speed it up after you are confident in the > >> software. > >> > >> Dave > >> > >> On 4/13/2016 12:25 PM, dan...@austin.rr.com wrote: > >>> I have an XHC-HB04 wireless MPG that doesn't "quite" work yet. While > >>> working on it, I had a thought. > >>> > >>> Homing is one of the riskier functions. You could Z-down to a touch plate > >>> and not realize the plate's not underneath it at all and go scrambling to > >>> stop it. Having automated process buttons that take command away from > >>> the operator are inherently risky. > >>> > >>> My idea would be that you would have to HOLD DOWN the Home Z button for > >>> the process to continue. If you release the button before it's complete, > >>> the axis just stops and it forgets about homing. > >>> > >>> This would tend to direct your attention to what's happening and if > >>> things go wrong you just let go. Also if you were to accidentally press > >>> the Home Z button, nothing serious would happen. It would bump down like > >>> 1/4 in and stop when you realized you pressed the wrong button. > >>> > >>> What might it take to implement such a thing? I do have trivkins for the > >>> gantry, and the homing is already a somewhat complicated special-case. > >>> > >>> Danny > >>> > >>> ------------------------------------------------------------------------------ > >>> Find and fix application performance issues faster with Applications > >>> Manager > >>> Applications Manager provides deep performance insights into multiple > >>> tiers of > >>> your business applications. It resolves application problems quickly and > >>> reduces your MTTR. Get your free trial! > >>> https://ad.doubleclick.net/ddm/clk/302982198;130105516;z > >>> _______________________________________________ > >>> Emc-users mailing list > >>> Emc-users@lists.sourceforge.net > >>> https://lists.sourceforge.net/lists/listinfo/emc-users > >> ------------------------------------------------------------------------------ > >> Find and fix application performance issues faster with Applications > >> Manager > >> Applications Manager provides deep performance insights into multiple > >> tiers of > >> your business applications. It resolves application problems quickly and > >> reduces your MTTR. Get your free trial! > >> https://ad.doubleclick.net/ddm/clk/302982198;130105516;z > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ > Find and fix application performance issues faster with Applications Manager > Applications Manager provides deep performance insights into multiple tiers of > your business applications. It resolves application problems quickly and > reduces your MTTR. Get your free trial! > https://ad.doubleclick.net/ddm/clk/302982198;130105516;z > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
