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 >> >> >>
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