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Hi Voicecoil

The diagram in post 40 shows the signal path through the circuit after the HCPL-2631 opto isolators

the only diode is within the NTR5198NL-D FET

hence my comment in post 30...

it depends on the budget your working to

if its a hobby machine then try amazon or ebay etc
buy 1 to check the quality then order the others you need

for a business machine you use to make...

As usual
the devil is going to be in the detail
when looking for the solution to problems connecting limit switches to breakout boards
for instance the LJ12A3_4_Z_BX proximity switch does not...

OK , that makes sense renewing the old insulation
I would still replace the tape

Is this Mounting Disc the type of thing your looking out ?...

Another diagram to expand on the one in post 39

26320

John

Hi Doddy

I see you changed your mind
dont worry
your original reply just pointed out we use the technique that we are happy with

I have to admit unless I am under instructions to maintain a...

yes
that will control the motors just like the tinyG for example
the only thing missing is the FET to switch the spindle motor on and off

with the arduino cnc sheild you have just linked to you...

I don't see why not if the Grbl board can work with the larger working envolope

going by the photos of 3D printers the 3018 machines they use small plug in 1A stepper drivers like these
...

It takes most people by surprise but
it is normal for stepper motors run too hot to the touch

different manufacturers give the maximum temperature as 70 to 80 C

RS Pro High Torque Hybrid...

In post 10 ,the second link for the
"Soft-start, inrush current limiter for toroidal transformers-assembled, tested"

reminded me of project 39 from Elliott Sound Products
Soft-Start Circuit...

you should be able to connect the BOB directly to the FET

25991


the 2N7000 would be an alternative FET in a smaller TO92 case

25992

John

going by figure 6 on page 5 of the pdf data
I would aim for a minimum of 5V

while the absolute maximum ratings for Vgs is +/- 30V
I would limit the maximum to about 20 V

pdf data
25990
...

it looks like you have a few options to try if the opto-isolator board does not work

John

looking at the photo of the opto-isolator board
it has 3K resistors fitted as shown on the chinese circuit diagram
so the output current is even more limited

with a 3K or 3.3K resistor between...

what happens when you turn the curren limit knob clockwise to turn the current limit up ?

John

It should not run that hot
double check your not connecting 24V DC to a 24V AC coil !

which contactor do you have ?

John

your wiring of the PNP N/C switches to the AXBB_E looks correct to me

having both the + & - terminals of the AXBB_E opto-isolator inputs free to wire as required
makes it easy to use the ...

the devil is going to be in the detail

when my home was rewired a single RCCB was fitted to protect all circuits
(these days a split consumer unit would be fitted with 2 RCCB's)

so if I...

For one of the supply wires to be "Neutral" it has to be connected to earth / ground other wise it would be just another line

the earth connection has to be a low enough impedance to ensure the...

double insulated equipment with no earth / ground connection can help avoid problems with ground loops when multiple pieces of equipment are interconnected
but can be present a shock hazard when...

the machine looks like it is worth the money without the electronics

the base of the machine is large enough to house the electronics

if it has a RS232 serial connection to the PC
I...

If you use a TB6600 stepper driver set to 4A
a stepper motor rated at 4.2 amps will run at the 4A set by the driver so there should be no problem
the motor torque will be reduced to 4/4.2 of...

as I can not read Chinese either

I would check to see if the fuse is connected to one of the power terminals
if it does as I would expect that will be the Live (hot) terminal

I notice that...

the original picture taken from
http://georgestone72.blogspot.com/20...for-3020t.html

is this -

25183

it looks like its the x-ray view looking through the board

its possible the input...

by adding to the diagram from
http://georgestone72.blogspot.com/2013/03/yoocnc-t62-3ax-cnc-controller-for-3020t.html

this may help

25182

john