Retrofitting a 1986 Maho MH400E

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26 May 2020 09:19 #168951 by hanmon
little by little,
waiting for the paint to dry







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26 May 2020 09:29 #168953 by RotarySMP
Servus Hanno.

Fourth axis connector?

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26 May 2020 10:06 #168957 by hanmon
Hi Mark,

exactly ! ;-)

I like to have a proper wiring from the beginning.
This includes the conduit and connectors.
There is nothing more frustrating (for me) than having the axis working and the cables still have to to be cut, relocated and wired up.

Cheers

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26 May 2020 10:16 #168958 by RotarySMP
Nice. You are using an original Maho manual rotary table with encoder feedback into the control arent you?

My Maho has a connector for a fourth axis feedback, but that was all. Sooner or later I am sure I'll get motivated to do some sort of fourth axis as well. I like the cast iron framed harmonic drive Andy did, although I'd use a hollow shaft one like this:
www.ebay.at/itm/ONE-USED-harmonic-drive-...p2060353.m1438.l2649
and belt drive it to allow stock to pass through the body.

Or maybe I get lucky and pick up a 150-250 sized Nikken for a good price.
Mark

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26 May 2020 10:53 - 26 May 2020 15:00 #168965 by hanmon
Hi Mark,

no, it is all DIY with a Sumitomo Fine Cyclo Gear:
www.cncecke.de/forum/showthread.php?1026...chse-f%FCr-Maho-400E

I'm gonna use the 4 or 5-pin original connector of MAHO's fourth-axis feedback for my z-height setter or the 3D-Digitizer and the large multi-pin Harting connector for the axis.
The axis needs cables for servo, encoder and resolver.
The next pictures, maybe tomorrow, will show that ;-)
Last edit: 26 May 2020 15:00 by hanmon.

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07 Jun 2020 11:45 - 07 Jun 2020 12:26 #170467 by RotarySMP
Cool, thisoldtony posted an update on his MAHO 400P project.


It really does show how much simpler machine tools have become since numeric control took over.
Last edit: 07 Jun 2020 12:26 by RotarySMP.

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20 Jun 2020 12:53 #172153 by Christophe C.
Hello,

First, congrats for the hard work, that's a nice machine you have now. I've been myself restoring a MH800T for a Fablab here in France ( some pictures here ); it's a lot of work but these machines are worth it.

It's running on Heidenhain and it works great so no Linux CNC for now, but that's definitely something I'd like to do one day, to maybe add a 4th axis and that kind of stuff.

Anyway, loosing track here; I came to ask a question on your machine; I'm looking for an overarm support for horizontal milling for my machine, and I can't even find a picture of this support for 800 Maho - just a drawing on the user manual. I'm wondering if for some weird reason, the 400 and 800 may share the same support. The horizontal spindle has two bolt patterns; the largest one is used for the vertical milling head, and I have no clue what the smaller one is for, only thing I know is that it seems very similar to the bolt pattern on the 400 machine. I'm talking about these 4 threaded holes and two dowel pins :



Could you please measure the spacing of these threaded holes on your machine? Here are the measurements I have on the 800.



Thanks for you answer,

Christophe
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20 Jun 2020 13:26 - 20 Jun 2020 13:27 #172154 by RotarySMP
Hi Christophe,

The 800 is quite a beast! I looked at your thread. You have put a lot of work into that machine. Thanks for posting that link. It looks like you have a similar 18 speed gearbox as my little Maho, so if you do even need to retrofit it, you could use the gearbox comp for it.

When the shaping and horizontal support for a 400P came up for sale, I had the same question. I wrote to DMG and asked, and they responded by sending me this drawing from the shaping head mount. The hole pattern is 145mm wide, by 108mm high, I went in the basement and double checked that.


Either you need to improve your measuring accuracy considerably :), or the 800T needs bigger accessories. Sorry.

Mark
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Last edit: 20 Jun 2020 13:27 by RotarySMP.

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20 Jun 2020 13:42 #172155 by Christophe C.
I will sure come back to you if/when it goes Linux CNC. I'd better start working on that before the control die as having it running would make all the retro engineering much easier.

I've seen a video of your shaping head, it's a beauty. Not a word on these accessories in the user manual? Now I need one for the 800 ;)

Regarding my measurements, I made them on a blueprint with no scale so I may be off... but sure not by that much. I will double check next time I'll be near the machine - unfortunately it doesn't fit in my basement!

Thanks for taking the time to answer!

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