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 <mailto:condit.a...@gmail.com>> To: EMC-Users <Emc-users@lists.sourceforge.net <mailto: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 <mailto:albertson.ch...@gmail.com>> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net <mailto: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 <mailto:bodge...@gmail.com>> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net <mailto: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 <mailto: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 <mailto:dengv...@charter.net>> To: emc-users@lists.sourceforge.net <mailto: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
