Lathe Retrofit

[BJherramientas]

Hello I am starting a new project with a lathe I ask for help for which I would like to use The Centroid technology for which I need a little help in recommendations I am interested in having manual control on the x and z axes. Not sure if the Acorn cnc controller card has the capacity I only see one input for an MPG and the other question how good it is to invest in the OAK controller card thanks for your attention

[tblough]

Acorn cannot do manual control other than with the wireless MPG. If you want dual handwheels on the machine as is visible in the photos, you will need either an AllIn1DC or Oak controller depending on your current servo drives.

If you have DC servo motors (which I'm guessing is the case due to the transformer and smoothing capacitor in the photo), there is a good chance that you can use an AllIn1DC. You might need to change the encoders on the motors.

If you have AC servos and drives, and the drives accept 0-10VDC input, they you can use the Oak controller.

[BJherramientas]

Thanks tblough my plan is to change all motors and drives DMM servo control but I have not seen the option to try to recover at least the motors that are more complex to replace. A friend tells me that it is not good to combine old systems with new ones this installation of new drivers for motors

[centroidsupport]

Are the existing motors operable? They may be usable with an Allin1dc (though the encoders may need to be replaced.)

[tblough]

Post some photos of your motors and motor labels. A lot of older DC servos are perfectly fine with just upgrading the encoders, and may be better quality than the entry grade DMM hardware.

[BJherramientas]

If this is already our second retrofit project, we work on a supermax mill, we decided to replace all 1kw DMM motors and servos and the MASSO controller, it worked very well. And for this project MASOO does not have the capacity to handle the lathe in manual and apart from that we want to learn about this technology that Centroid offers. It would be excellent to recover the motors referring to the encoders, I think it would be to uncover them and check if they are absolute or incremental and to the control the OAK card would send the pulses thanks for your support

[centroidsupport]

I'm nearly certain the encoders would be incremental. It would be a question of the resolution (line count) of the encoders and whether or not there are actually encoders on the motors - the could instead be resolvers.

I can't read the name plate well enough in your photos to tell what's on them.

[Muzzer]

The last photo clearly shows an incremental differential encoder (A, B, Z and their complements).

The SEM models are defined by the frame size (presumably MTS30 have a 3" rotor?), with a variety of different lengths and windings, giving rise to a family of variants within each frame size. The suffix "38" refers to the voltage constant (Kv, aka "back emf per 1000rpm"). There were a range of options for things like encoders, tachos etc. This MTS30M4-38 is likely very similar to an MT30M4-38 ie 26lbin/3Nm/3700rpm/140Vdc which agree with the nameplate numbers we can see, so ideal for a DG4S drive.

TBH, given the mechanical complexity of the installation, I'd drive leave these in place and drive them with a modern digital DC drive. I have very similar motors and encoders in my large milling machine (MT30R4-46) and simply used the DG4S-16035 drives with a 140Vdc linear PSU. The encoder connects up directly, the drives take step/dir from Acorn and the motors are correctly sized for the application.
https://www.cncdrive.com/DG4S_16035.html

MT30R4-46 Technical_Data_Manual servo motor.pdf

(1.98 MiB) Downloaded 48 times

[centroidsupport]

Muzzer is correct. These are incremental encoders (I couldn't see that on my phone with my 60 yr old eyes)
As tblough pointed out, the Acorn can't do dual handwheels but the AllIn1Dc can.

The power supply for the DC bus for the servo motors may already exist in your cabinet in the form of a step down transformer and rectifier

If the dual handwheels are an absolute must, I'd suggest taking this post to the Centroid Oak, Allin1DC, MPU11 and Legacy products section of this forum. https://centroidcncforum.com/viewforum.php?f=64

[martyscncgarage]

Looks like 1250 Line encoders on those DC Brush Servos.

To answer the original posters question. NO, you can't use your handwheels with their encoders on ACORN.
I would use All in One DC as already stated on this lathe. It retains true closed loop capability, and you should be able to use the existing handwheels.

Your Masso/DMM system is not true closed loop.
I have used DMM DYN4 with Centroid OAK, using the cables supplied by DMM. Oak is also true closed loop and can use those handwheels.
DMM DYN4 is on the low end of AC Servos but I have had good luck with them.

Marty