Retrofitting a 1986 Maho MH400E

Also we must pay attention to the way we make the grounding of any component we add to the system, or we may end up trying to tune the servos for ever do to ground loop.

All axial.


I was planning to reuse the original MAHO +/-10V twisted pair/shielded cables, and the original Heidenhain cables. Good point about making a faradays cage for the EXE.
Mark

Hello, there is one little problem, in LinuxCnc tb3-1…16 referred as tb3-0….15. Everything starts from 0, not from 1. I will make the configuration minus one on every contact. Can you make new drawings with the right numbers?
John

Also on every TBX connector array there is inputs and outputs we have to name the contacts in a way that reflect the names on hall and make sure there is no chance to make mistake when wiring. Any suggestions?

There is one of the inputs from the cams that is going to the tb2 and all the others on tb3, can we wire them all on tb3?
John

Evening John,
Please post some photos of your wiring.

Yes, I just assigned the the pins in the order they fell off the schematic. When I revised the schematics, there were 18 inputs from the MAHO relay board, so I couldn't get them all on one connector. Since our discusion about the "enable Axis", I see we can free up two pins by only using only one pins there, so that all the inputs could be on one connector.



I need to revise this list and the schematic, to keep the signals in the same order as the ribbon cable. I was planning to cut the ribbon cable and split out the individual wires.

Please reassign if it makes things more practical. If you print out the wiring diagrams, write the changes on them as you install them, and then send me a scan, I can update those wiring diagrams in the PDF's.

Kind of a pain that LinuxCNC assigns the pins 0-15 where MESA names them 1-16 in there documents.I guess we could just copy the MESA doc's, and rename the pins to agree with the LinuxCNC terminology.

I have never done this before, so I don't know the best pratice in naming the signals. If we think of a signal chain, there are a lot of terms for the same signal. For example:

"Release tool"--> Relay "5K1" --> screw connection "219" --> ribbon cable "28X1-7" --> 7i84 connector "TB3-18" --> 7i84 signal name "Output 01"--> HAL name ???
Maybe Andy Pugh, or one of the more experienced guys could give us some guidance about what works well as a HAL naming convention?

Today I have been working on the EXE card shield, on planning the 3D printed parts needed to mount the ITX PSU, the hard drive, and the EXE, and on making up the 7i77 --> 7i84 RS-422 cable. I really don't understand why MESA doesn't have a matching RJ-45 connector on the 7i77 board. It is a real PITA to cut a CAT 5 cable and crimp the ferrules on those tiny wires.

Unfortunately I have no network in my basement, so I'll have to bring the whole PC and touchscreen up to the office to hang it on the network cable to install the ELO touchscreen drivers.

Mark