Retrofitting a 1986 Maho MH400E

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29 Sep 2017 13:43 - 29 Sep 2017 13:46 #99613 by RotarySMP
Good spotting. We have a bit of a chicken/ egg problem here. You want to be out of E-Stop before enabling NC-Ready, but can't be out of Estop without NC-Ready.

I guess it would work if we did it similarly to the Phillips start sequence. Press E-Stop release and NC-Ready at the same time.
Mark
Last edit: 29 Sep 2017 13:46 by RotarySMP.

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30 Sep 2017 12:34 - 30 Sep 2017 12:37 #99678 by drimaropoylos
We can remove the 7A1 from the cnc ready chain, and use it as input to LinuxCnc for servo enabled and ok. Or we can modify the qui off Gmoccapy so there is only one bouton for estop-servo enable, like in the video
Last edit: 30 Sep 2017 12:37 by drimaropoylos.

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30 Sep 2017 16:44 - 30 Sep 2017 16:46 #99688 by RotarySMP
I need to test and see of pushing both buttons at once would work, as if does is it will need to least change to anything.

Today I cut a peice of scrap aluminium as a mounting board for the various electronics. The ITX PC and 7i77 will go on the mounting board,



while the Heidenhain EXE mounts on the side wall,


and the 7i84 on the cabinet door under the MAHO relay board.

While waiting for the "Verdrahtungskanal" (the wiring chanel with the comb wire openings) to arrive, I need to design and 3d print a DIN rail adaptor to mount the ITX PSU, the harddrive and the Heidehain EXE mounts.

The 17" touchscreen monitor arrived today as well, so I can start measureing and laying out the control panel and housing. I friend of mine has contracts with a laser cutting company in Bratislava, so i'll be getting the sheet metal laser cut.

How is your gearbox ladder coming along John?
Mark
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Last edit: 30 Sep 2017 16:46 by RotarySMP.

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30 Sep 2017 17:42 #99691 by drimaropoylos
Tomorrow I will start making the new configuration according to your wiring diagrams.
Your machine does not have the slightest sing of use, not even dust on the cabinet. It was from a school?
John

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30 Sep 2017 17:57 #99693 by drimaropoylos
Do you have list for the capacitors on the amplifier that needs to be replaced so I can make order?
John

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30 Sep 2017 21:57 - 01 Oct 2017 08:43 #99700 by RotarySMP
100µF 40V 85° 20% Elko (8 of)
2200µF 40V 85° 20% Elko (3 of)

You will need to check those values against your Indramat. Your 600E motors are probably more powerful than my 400E's.

Yep. It came out of the HWK Passau in Bavaria. I have done a fair bit of cleaning, but it was more dust than swarf and coolant.
Mark
Last edit: 01 Oct 2017 08:43 by RotarySMP.

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01 Oct 2017 05:06 #99723 by drimaropoylos
Good morning, the capacitors are axial or radial arrangement
John

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01 Oct 2017 06:26 #99724 by drimaropoylos
I thing that you should shield the exe board from electrical noise. The output of the exe board is digital (on-off quadrature) but the input is sing wave from the heidenhain scales, any noise in this signal is perceived (from the exe board) to be motion

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01 Oct 2017 06:33 #99725 by drimaropoylos
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.

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01 Oct 2017 08:46 - 01 Oct 2017 08:49 #99728 by RotarySMP
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
Last edit: 01 Oct 2017 08:49 by RotarySMP.

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