Retrofitting a 1986 Maho MH400E

Maho CRT monitor to LCD monitor replacement.
www.practicalmachinist.com/vb/dmg-mori-s...-monitor-pix-162256/ shows the Neovo F415 LCD 15 inch monitor that works without a frequency converter. The F4?? series will work at low sweep rates . F415 is a 15inch size and a F420 is a 20 inch size.
That Neovo F415 LCD monitor is no longer being manufactured, I think. So try to pick up one from E-bay or other used equipment seller.
Just a question but why change the servo motors and servo-drives ?
Maybe cgroth can help with how to establish a connection between PC and Maho effectively.

Fermaq wrote: I do not know this company. I was doing a search with emcPT in the search engine but I could not find anything related ...

forum.linuxcnc.org/show-your-stuff/32765...-with-linuxcnc#92757

(Or search by user name in the advanced search)

Hi Fermaq,

I would recommend you start a specific thread for the maintenance or retrofit of your MAHO 300C, as it is a sufficiently different machine that it is not a good idea for this good information to be buried in page 38 of a MAHO 400E thread.

Hi Dominik,

I have found some time to read through your gearchange.comp some more. I am updating my files to use the same HAL pin terminology as your COMP so I dont get confused between similar terms. I have a couple of questions:

pin out bit reducer_motor;
pin out bit middle_motor;
pin out bit input_motor;
pin out bit motor_turn_right; "Is this is the Reverse direction - 11K7 relays"
pin out bit motor_center_pos;

pin out bit spindle_small_left;
pin out bit spindle_small_right;
pin out bit spindle_brake_transm; "This function is done by piggybacked contacts on the CW or CCW relays on the 400E"
pin out bit spindle_turn_left; " Does this COMP also start the spindle once the gearchange is complete?" I thought it was only the S code which this COMP reacts to, with the spindle start being the standard M3/M4 codes in the G code being implemented in the standard LinuxCNC way.
pin out bit spindle_turn_right;
pin out bit spindle_star; "The soft start is done by a time delay relay (1K5) and is thus automatic on the 400E" Which other parts of the code would I need to deactivate ?
pin out bit spindle_triangel;

pin out bit spindle_at_speed;
pin out bit transmission_lamp;
pin out bit ready;

Mark

Hi Mark,

-pin out bit motor_turn_right; "Is this is the Reverse direction - 11K7 relays" YES,
-for the brake i still have to do some minor changes
-star relay , the 700 has no soft start, this is only used for the toogeling between gear changes
-the whole spindle function is managed by the comp, for this the spindle outputs from motion have to be linked to the inputs
spindle_left_enable and right_enable from the comp

Hi Dominik,

Thanks for the prompt response. Are you also in a somewhat boring seminar like me?

Is there an advantage to having a manual speed change button, rather than just using the MDI and inputting an S command? If I leave the manual change HAL pin unconnected, will it still work?
Mark

J Green wrote: ........................
Just a question but why change the servo motors and servo-drives ?
........................
Maybe cgroth can help with how to establish a connection between PC and Maho effectively.

The controller that I intend to put in has no way to communicate with the existing servodrives, it has no analog output. It has analog output only for spindle control. That is why I have to replace everything.
What I have in view is not very sophisticated. The investment I intend to make is related to the machine and its dimensions.

Of all the times I tried to communicate with the pc the best I could was to copy a program that had a total of 18 lines. I know it has nothing to do with the capacity of the machine memory because at that time the memory was empty.
A technician advised me to replace the integrated circuits I send in this photo, possibly some of them would not be good. I replace the two circuits but the problem remained. In a diagnosis to the V24 appeared information saying "DTR / DSR Must be 1"
I tried the constants but nothing, I think there was something out of my reach there.
These integrated circuits had previously been replaced perhaps by the same problem.


pt.aliexpress.com/item/Newkye-Venda-Quen...s.8937460.0.0.VBI0vW
I will probably put this controller, or another similar one.
What is your opinion?

RotarySMPT I agree, but I'm new here, I do not know how to do it. If there is moderation here I would ask if they could do this from a post of mine, for example. I did not want to disturb your sharing or your work with myself ...