Upgrade? Chinese CNC Machine

[Patr1ck]

Hi all, this is my first post here, I just registered to say I have the same machine with 4 axis I bought from Ebay.

First of, I want to say the value of the resistor is 100 OHMS 1/4 watt to the person that asked, as his was burned out.

Second. I have the same driver board that drives X Y Z (YOOCNC-NT65-3X) It's a piece of crap. There isn't even any DIP settings for switching micro stepping etc. My fourth axis is actually a YOOCNC also, but is a red PCB and it has the same driver chip "TB6560AHQ" but it has the DIP settings. I had major problems with my X axis with a 0.9mm difference when returned to X=0 Y =0 after milling a doubled sided PCB with small traces for SMT and drill holes etc. So you see 0.9mm loosing steps on the X axis was a critical problem. I'll upload picture of the 4th axis driver board!

The initial problem was the settings when I got the machine first. The manual states "400 / 2000 / 200 / 3 - 1 " all of this is perfect, but the Velocity speed which states 2000. I have mine tuned down to 900 and I am running the Kernel @ 25Khz instead of the Manuals stated 35Khz or on the main BOB the motors stall, loose steps, vibrate etc.

Now I switched the X axis stepper over to the extra board (RED PCB) I was able to set the steps with the DIP settings on the board, and I don't loose steps, the stepper is running really smooth with little to no noise from it at all compared to the other steppers on the main BOB. Y and Z have high pitched sounds coming from them when in use, but now with the new DIP settings on the x axis I can run it @ 2000 in velocity @ 35khz kernel with out loosing steps, vibrations, and the motor just hums nicely.

So to some it up, I am getting rid of this YOOCNC breakout board and replacing them as soon as I have the dosh.

The machine it's self is nice and well worth the money, the controllers are shite !

Here is the one I bought in March I think.

220V CNC 3040Z DQ Upgrade From 3040Z 3040 Router With 230W 11000rpm Spindle | eBay



The CNC gantry system is good. The controllers are bad, and hell, the controllers could even be a clone of the already crappy controllers from YOOCNC.

Questions welcome, and anything else. I just thought I would share my thoughts and frustration and my how I fixed my issues here.

On another note, I am replacing all the boards except the transformer and other simple stuff to a Pokeys 56U + Postep25 motor drivers for Mach3 when I got the dosh.

Polabs

My software for initial use:

Diptrace
Vcarve Pro
Mach3
and shitty YOOCNC controllers, plus all cables leading from controller to steppers are unshielded !

Also I replaced the main CAPS on the BOB to Nichicon LOW ESR just incase. The IC chips (74HC***) should be really 74LS*** so that they can properly use the TTL logic from the parallel ports that don't support 4.5vcc. Some ports on computers actually output 3.3 I think or something in the that line.

Using the LC version means that they will support all types of parallel ports.


regards