that looks crispy...
On Mon, May 2, 2022 at 2:25 PM Alan Condit <condit.a...@gmail.com> wrote: > Andy, Chris, Dave and Jon, > > Here is a link to the photo <https://photos.app.goo.gl/w3zq4RjfPTQCTU787>. > I guess it was too big to post directly. > > Alan > > > On Mon, May 2, 2022 at 11:18 AM Alan Condit <condit.a...@gmail.com> wrote: > > > Chris, Andy, and Dave, > > > > I guess I didn’t give enough info. I built this controller in 2005 for my > > lathe. I used it on my lathe until a couple of years ago when I added > > another drive and switched this controller over to my PCBmill and X2 Mini > > mill. I built a new controller for my lathe using a Mesa 5i25/7i76 pair > so > > I could control spindle speed. The picture shows the two blown out parts. > > This controller worked for 15 years before letting the smoke out. I agree > > Andy, that it is difficult for a fault to continue to generate steps but > > that is what happened. It is possible that there was a design flaw but it > > worked for 15 years. > > In the program where things went bad the X-axis should not have been > > moving but it was. I was cutting a bushing for a keyway broach. For quite > > awhile everything was going fine and then suddenly it began to cut into > the > > X direction when it was traveling in the Y direction. Then I saw smoke > > coming out of the controller box. > > Jon Elson suggested that I may have blown out the parallel port which > > seems likely to me now that I think about the way it is behaving now. > > > > Alan > > > > > > > >> ---------- Forwarded message ---------- > >> From: Alan Condit <condit.a...@gmail.com> > >> To: EMC-Users <Emc-users@lists.sourceforge.net> > >> Cc: > >> Bcc: > >> Date: Sun, 1 May 2022 09:49:43 -0500 > >> Subject: [Emc-users] Blown BOB and ??? > >> Hi Guys, > >> > >> I was machining a part on my X2 Minimill. Suddenly it left the > programmed > >> track (spoiled the part) and didn’t respond to Estop. I powered the > system > >> off manually raised the Z axis and tried turning it on so I could home > it, > >> smoke started coming from the controller. So I powered everything down > and > >> started troubleshooting. > >> There were two chips on the CandCNC Mini-IO BOB that had let out the > >> magic smoke. I had a spare BOB that I built using the Gecko G540 > schematic. > >> So I replaced the other BOB with it. The drives in the controller are > >> Superior Electric SS2000MD4 drives. > >> > >> When I got everything put back together and checked the wiring > everything > >> looked good so I tried powering it up. When I tried homing it the traces > >> move in AXIS but there is no movement on the machine. The motors hold > >> position so the output of the drives is active. Is it likely that I blew > >> out the inputs on the drives? > >> > >> Thanks, > >> Alan > >> > >> > >> > >> > >> ---------- Forwarded message ---------- > >> From: Chris Albertson <albertson.ch...@gmail.com> > >> To: "Enhanced Machine Controller (EMC)" < > emc-users@lists.sourceforge.net> > >> Cc: > >> Bcc: > >> Date: Sun, 1 May 2022 08:59:53 -0700 > >> Subject: Re: [Emc-users] Blown BOB and ??? > >> There is a good chance there was a wiring error in you original setup. > >> The > >> fact the E-stop did not work tells me there was a design error. E-Stop > >> should never fail, or rather if it does fail, the machine stops. If the > >> inputs on the drivers are blown, that says the same thing. Smaething > was > >> wrong as that should never happen. > >> > >> Diagnosing a system that has a design fault is really hard because our > >> brain tends to think of how a correct machine would function or how the > >> machine we THOUGHT we built should function. > >> > >> The best plan is to ignore LCNC the BOB and all for now and see if you > can > >> drive the motor drivers with a simple signal generator and no computer. > >> If this does not work, you need to replace or repair the drivers before > >> you think about reconnecting a computer. If you need to buy some test > >> equipment, now is the time. At least a cheap square wave signal > >> generator and a cheap $12 logic analyzer t go with your multimeter. > >> > >> Finally, you should draw a schematic of how you propose to connect the > >> computer and post it here for others to review. They will check if > >> nothing else the e-stop design to see that it is failsafe and also check > >> that you have the power and computer parts properly isolated. It seems > >> this may not have been the case in the past, and you don't want to > simply > >> put it back the way it was. > >> > >> First step is to verify the motors and drivers work independently of > >> computer control. > >> > >> > >> > >> Chris Albertson > >> Redondo Beach, California > >> > >> ---------- Forwarded message ---------- > >> From: andy pugh <bodge...@gmail.com> > >> To: "Enhanced Machine Controller (EMC)" < > emc-users@lists.sourceforge.net> > >> Cc: > >> Bcc: > >> Date: Sun, 1 May 2022 21:23:48 +0100 > >> Subject: Re: [Emc-users] Blown BOB and ??? > >> On Sun, 1 May 2022 at 15:53, Alan Condit <condit.a...@gmail.com> wrote: > >> > >> > I was machining a part on my X2 Minimill. Suddenly it left the > >> programmed track (spoiled the part) > >> > >> How? It is almost impossible for a fault to cause extra steps. Does it > >> appear that one axis simply stopped moving? > >> > >> -- > >> atp > >> "A motorcycle is a bicycle with a pandemonium attachment and is > >> designed for the especial use of mechanical geniuses, daredevils and > >> lunatics." > >> — George Fitch, Atlanta Constitution Newspaper, 1912 > >> > >> > >> > >> > >> > >> ---------- Forwarded message ---------- > >> From: dave engvall <dengv...@charter.net> > >> To: emc-users@lists.sourceforge.net > >> Cc: > >> Bcc: > >> Date: Sun, 1 May 2022 13:57:54 -0700 > >> Subject: Re: [Emc-users] Blown BOB and ??? > >> Being used to servos the first thing I test is the estop. Saves damage > >> to expensive mechanics. > >> Once I was testing a new interface. Running it from lower left to upper > >> right. It was gaining about .1" every pass. ... after about 4 passes it > >> took off for the upper corner at full speed: 400 ipm. My hand made it to > >> the big red button ahead of the upper corner but knowing the axis estop > >> limits were there and working gives piece of mind. Especially when the > >> combined weight of the saddle and the table is 700 Kg. > >> > >> Dave > >> > >> > >> > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
