Maho MH 300 C Retrofit...?

Start here...
forum.linuxcnc.org/12-milling/33035-retr...aho-mh400e?start=360
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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?

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.

If you haven't bought it yet, then you should reconsider using that controller. Not because of any failings of the controller (I know little about it), but it is a big job and a huge waste of time and money to rip out the driver and motors if they are working fine and were designed to match the inertia of the MAHO's axis. Just get a MESA 7i77 and an old PC and you have the analog outputs needed. This is a LinuxCNC format, so the expectation is that you are planning a LinuxCNC retrofit. If not, then you would be better off starting a thread in the Newkye support forum, if there is one.
Mark

I felt tempted to post about my maho because I read something and saw photos of a Maho like mine that another user posted as well. At the time I did not realize that I was doing this in an exclusive Linux forum.
I'm sorry, I'll be more discreet from now on. I wanted to find a general forum about CNC milling machines, but that it was active, where I could learn and share what I do, but without success in finding.

Now about the controller, the main reason that leads me to opt for that is the price and then stay with the machine updated. I am afraid to make the retrofit keeping the same servomotors, if they fail I will be again with the same problem. When placing new and current, later find easy in the market.

Afraid I don't understand your logic. You want to spend more money on a control and have to buy new motors and drives. Vs. Spending a couple hundred bucks for an interface card for Linuxcnc and reusing your old drives (which are probably higher quality than anything you can economically replace them with. )
You say you are afraid the old drives might fail, then replace it after that. Cost differed. Rather than replacing them unnecessarily.

From what I've been tracking on the RotarySMP Maho retrofit theme, I'm not aware that it allows me to do something like that.
Here in Portugal we often say: "Cheap is sometimes expensive".
I have not bought anything at the moment, I'm back from Schaublin 32, after having this machine to work, I'm starting at Maho. But if I have to hire the services of a specialist to do what I am not able to do, it will be very costly.
If I buy the kit (controller, servomotors and servodrives) I will have an expense of 1150 € + shipping + customs fees, but the main configurations and the main connections have already been made, I will just have to make the remaining connections to the machine. Adding to this I have not yet spoken of another point, I have optical measurement scales, and in winter I have problems with the humidity that is deposited in the scale of the Z, I have to clean with cotton other than the machine of the error in the start.
I see in the placement of the kit the solution to many problems that I had up until now, but I also admit that I do not know the cost of the MESA 7i77, so far I did not even know that it was possible to get analog output from this table. Still, I understand that I do not have the capacity / knowledge to allow me to do such a job.

Sorry if I woke the impression that this forum won't help, as this is a really helpful and experienced group of people. However, I would doubt that anyone here will have any experience with the NewKye, as we are fans of LinuxCNC. I searched CNCzone for Newkye, and there is not much info on there either. There is one guy on Zerspannungsbude.de who also did a retrofit wit one of the chinese controllers (they may be sold under multiple brand names).

I am using the MESA 5i25 + 7i77 plug and go kit ($279) plus an additional 7i84 i/o card ($79) to interface with the MAHO relay panel.

store.mesanet.com/index.php?route=produc...83_84&product_id=214
store.mesanet.com/index.php?route=produc...t_id=123&search=7i84

While that NewKye controller may come programmed to interface with NewKye drivers and motors, you are still going to have to implement the E stop chain, hydraulic tool release, home switches, central lubrication system, coolant spindle start/stop direction control etc. MAHO's 24VDC relay panels are rather easy to interface into. How many channels of i/o does the MewKye offer? Is it at 24V or only at logic (VCC) level?

While interfacing new motors to the MAHO is a lot of work, I think a lot of people underestimate just how much cost and work is involved in the near complete rewiring which such a retrofit plan would entail.

The NewKye controller can't close the loop to the existing Maho glass scale encoders can it? The servo's you install could still be closed loop to the motor encoders, but more important than loosing the accuracy of the linear scales, is that you loose the homing to the index marks of the scales. If your Maho is anything like the 400E, there are no separate home switches. Obviously you can add some, but that is another load of work, which is unnessary of you retain as much of the MAHO system as possible. Most "rip everything out and install new" retrofits of MAHO's lead to significantly less capable machines.

How is the spindle speed control of the 300C done? The 400E has an 18 speed gearbox to bring under control. Some models have a 2 speed gearbox plus a VFD.
Mark