Maho MH 300 C Retrofit...?

Per the MESA 7i77 user manual:

ANALOG INPUTS All field input pins are capable of reading the input voltage. These are not highly accurate or high resolution but can be useful for things like potentiometer inputs. Input resolution is 8 bits and input full scale value is 36.3V. Accuracy is +-5%

What is the interface of that keyboard? Is it a multiplexed set of buttons?
Have a look at this thread...
forum.linuxcnc.org/10-advanced-configura...ard-with-mux-generic
Mark

What is the type of signal MESA 7i77 acept?(??) My milling machine have linear scales very hold, they are Philips ...
If you can help me plesa said me what is the type of signal of this scales...? (TTL, VPP or 11 µamp). For the controller cames 5 wires...

The 7i77 expects TTL quadrature signals.

it is possible that your scales need a interpolation unit.

When Nick Müller converted his MH700C a few years ago, his also had the Phillips scales. He is a talented guy with electronics, but was not able to decode the Phillips scales and ended up replacing them them with some modern ones. I'm pretty sure all the modern ones like Mitutoyo, or the chinese copies are all TTL quadrature output, although most cheap ones are normally 0.005mm resolution, and the Mahos were built with 0.001mm resolution.

The thread is in German so you'll have to put it through google translate. It is here:
www.cncecke.de/forum/showthread.php?4346...highlight=k%FChstall
Mark

Mr Fermaq
I have only read from various places ( starting from the very - very old Nick Muller You-Tube video) about problems due to the Phillips scales. The scales were not working , parts were not available , no information was available , or used parts cost for one axis was more than converting to new scales for all 3 axis..

However in the past + -- year I have read that some company/person /? is selling a Phillips to TTL converter. Its cost is around $300 dollar per/axis, so not cheap. Also there is still the problem of the Phillips scales repairable when or if they break and also the problem of Phillips scales being prone to dust or dirt getting on the glass.

This may be the place for that converter , (. www.bulgarianindustry.bg/assets/cms/Imag...verter_datasheet.jpg ) but I am not sure. Also I have no knowledge of this converter or the maker.. You are on your own,pilgrim ! Good luck

Later models of Maho machines used Heidenhain Series LS403 scales which incorporated a scale output reference mark at each of the scales ends . But again ,the Heidenhain Series LS403 scales are no longer made - not supported - an used parts are big $$$ .

My thinking is any Maho retrofit that intends to finish with equal or better performance to what the original machine was ,will have scales on every axis the same way that Maho did.

Glad to see you are still working on the retrofit
Bob

I'm afraid I can not do the retrofit with Linux 5i25 / 7i77 Table so I hope I can count on your help. Connecting the wires I think for me is no problem, but part of the programming / settings, ... I see this very dark.
I tried a simpler method for myself and my abilities but it turned out to be ruinous. Here in portugal the technicians work very expensive, and the companies that represent the brands want to earn a lot in a short time, so I decided to be autonomous and try to be me to take care of the situation.
On the scales I have the same opinion as you. Between buying a converter and placing new Chinese scales with a TTL signal, this last option is the most suitable for me, because in the scales the machine has, in winter had problems with humidity, accumulated moisture in the scale of the Z axis and gave error in reading. I had to clean / dry with cotton and only then could I get the machine to work, so I could only succeed in reading.
I will continue to post my speeches here and my doubts as well. I hope to count on your help mainly in the settings.
.......................
I had already taken a few steps in the way I was following, I hope I can keep the work done to use with 7i77. There are things I wanted to keep as traditional ...
Can I reuse this handwheel with linux and Mesa 7i77?
(Fermaq is the possible name that I can put when it is company)
Alexandre