Not as cool as
Bacho's buy, but I picked up a Tormach PCNC 1100 from a surplus auction. Came from VA Tech and appears to have pretty low hours. I was told it was purchased for some joint venture program. Only downside is that it didn't come with a control....which is effectively a simple PC with a motion controller card. Gonna call Tormach tomorrow and make sure I'm not missing anything, but it looks like I can buy the latest version of the Pathpilot control for about $900 and that should be all I need. Also looking in to some other options that can use a cheaper PC and a $140 mesa card. Either way, paid about $5k for the machine and shouldn't be more than another $1k to get it running. Most likely going to flip it, but kind of want to run a few parts on it and get a feel for the control first. Should be able to get $12k+ for it if everything works like I expect it to.
Update on the Tormach.....
I ordered a copy of Pathpilot from Tormach - $42 shipped
Orderd a 7i92TH from Mesa - $123 shipped
I loaded Pathpilot on to an old NUC I had laying around - $Free?
And that's where the fun began. I could see that the PC was "talking" the the Mesa card, but it would not connect to to the machine. After talking with the guy at Mesa, and then a support ticket with Tormach, I was almost convinced the the main board in the machine was toast. But then I was also getting some feedback that the "T" versions of the 7i92 (i.e.: 7i92
th) used a different set of chips and were not a direct replacement for the old ones without Tormach adding new firmware and drivers to Pathpilot. When I asked Tormach if that I updated, they would only tell me that they only supported the card sold on their site.....which is a 7i92T in a fancy enclosure for 3x the price.
In the meantime, one of the guys from Mesa on the LinuxCNC forum chimed in and said the had a "scratch end dent" original 7i92 that had a bad i/o header, but it wasn't the one Tormach used so it would work for me. He threw it up on their site for $10 + $15 shipping so I grabbed that.
And then today, someone on the Tormach forum chimed in and said "Tormach has added suppor for the "T" cards. Make sure you have the jumpers set correctly for the EEPROM IP address. " ****ing hell. I thought I had verified that, but I read the diagram in the manual wrong and needed to move one jumper. As soon as I did that, it fired right up and connected.
While all of that was going on, I was also finding some ****ery in the wiring from the previous owners. There was second 110v plug that hard wired to the switched side of the main contactor. Not knowing exactly how this thing was supposed to behave when powered on, I noticed that the contactor wasn't closing like I expected it to and thought that might be my control problem. So when I manually actuated that contactor, it managed to connect the two legs of the 240 circuit together - it just happened that the 110v leg they used to jump the contactor was the opposite leg from the one coming in to the upstream side. So I had to order some fuses from Amazon.
New main fuses in to the main 220v circuit and had most power back, but that contactor wasn't actuating like I expected it to. I found that I could jump two fused circuits on the main board itself and get everything to power up, but that's wasn't right. I was troubleshooting all of this at the same time I was trying to figure out the PC/Mesa stuff and I wasn't sure which problem was causing which. Turned out they were completely unrelated. After some more probing, I found a .75a fuse on the output side of the control step down transformer. That was the line that fed that contactor. More fuses ordered and BOOM - working like it should.
There was also some ****er with the e-stop switch. They had it wired backwards so "out" was actually in e-stop and in was normal. Fortunately I found that before I got the control working so it didn't leave me confused when I got it powered up.
And then finally, once I go the Mesa thing sorted out today, I found that the X and Y limit switches were wired wrong. They had added a door open switch, which apparently gets wired in to the limit switch circuit to shut the machine down if you open the doors while it's running. Somehow the managed to **** it up where Y worked, but when you homed X, it would trip the Y limit too. I couldn't actually figure out how that door switch was supposed to be wired, so I pulled it out and wired the limit switches back to normal. I don't need that safety **** any way!
So, probably 4-5 hours of trouble shooting and about $200 in hardware and software and it's all working. I'm ordering some tool holders tonight so I can actually try it out and make a few parts on it, but ultimately I'm probably going to just flip it and make a couple grand for my troubles.
Best I can tell, this thing may not have any hours on it at all. I'm guessing it was purchased for a program that never happened. Someone else at the school got ahold of it and possible added the enclosure - which is when the e-stop and limit switches got wired wrong and probably when the little fuse popped and then they tried to troubleshoot it and made it worse.