Retrofitting a 1986 Maho MH400E

Hi to all, J Green you have removed the components in the red cycle and then you have apply pressure in the point of arrow?
John

No wonder these things cost the earth when new, and MAHO ended up loosing this small CNC market. The costs of this constant modification and customisation must have been enormous if barely two machines were built identical.

Mine had a 432/10, but with an 8088 processor. It was only 2 1/2D capable.
Although I never got to run the Phillips control, I have read that they had a very good interface for picking up jobs stopped halfway. The Phillips is also popular for it's conversational programming and canned cycles. You would need the opinion of someone with both Phillips and NativeCAM experience to give feedback whether LinuxCNC is competitive on that front. They must have also had a procedure for on the fly tool changing, although that can also be implemented in LinuxCNC...


I am assuming that the LinuxCNC motion engine is superior as the Phillips had no look ahead did it?

Now you mention it, my Y axis scale does have two reference mark stickers.

I definately tried homing on the RH end ( which would be the ram fully retracted) when I was tuning the axis, but found no index there. I'll try again once I have the scale realigned. I procrastinated on that since saturday.

Mark

cgroth Thank You for the photos an information about the MH300C. That ,to me, looks like a very-very nice machine. It doesn't even have any belt dust from the belts. I am envious. Wish I could find one like it . Am also envious about that nice shop and it's tile floor. That is nice. Wondering what those other Green machines in the shop are?

You mentioned having manuals & information if needed. While I do not realy need manuals & information about the MH300C or TRK 6-4U drive & it's motor or information about 432/10 ,I sure would spend nights reading it. Am sure that others reading Mark's thread could find value from the manuals and information . Speaking just for me , I would sure appreciate reading it.

Again! Thank You

drimaropoylos / John Hope this helps


#2 is the steel holding the shaft wiper ,the add on O ring is there also

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#4 is where the shaft wiper goes ,and spindle nose has two drive dogs that drive the tool holder

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#1 is another part that was loosened

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#3 does your horizontal Quill also move ?



Maho Head.jpg[/attachment]

Through a Youtube response, I was given this link to a report by a Czech student, Ing. Jan Cedrych, who converted a MAHO 500C to LinuxCNC back in 2010.

www.vutbr.cz/studenti/zav-prace?zp_id=39152

The link "Prìloha" on the LH side has his GEAR change HAL and Comp files. Unfortunately these are commented in Czech, which I can't read, and his machine had the Siemens simoreg DC spindle drive and only two gear ratios, but they are interesting for anyone who wants a solution for the gear changing of that model.

Attached is a google translate of Ing. Cedrych's thesis

Mark

I aligned the Y-axis Heidenhain LS-403 scale today. The allowed tolerance is 0.1mm over the length, but it was pretty easy to set it within about 0.01mm.




The gap between the scale and the head should be 1mm +/-0.3mm, which was also easy to set with feeler gauges.

After reinstalling the end stop blocks and switch, and testing them, I homed the axis...

...and jogged it around for a while, checking it's postion against a ruler. It now seems to work correctly. Where before it was gaining about 20% on jogged distances due to lost encoder steps, now it seems fine.

I also got my USB cellular network datastick working under LinuxCNC which will help with updating and looking stuff up.
Mark