Help please. Dip switches and mach 3 settings

[Clive S]

I found both ones available in my area, 22 euro for db25 (with relay), and 30 euro for the C10 (if it works with that flaw)
Also HDBB2 at apx 50 euro https://www.ebay.com/itm/HDBB2-break...sid=m570.l1313.

So I.ll get any of these, now the tricky part is which one?

Also have available UC300ETH, but it is expensive as hell, apx 150 euro

Like this;- https://www.ebay.co.uk/itm/5-CNC-Axi...4AAOSwaxlZiq98

These boards require 5v and 12-24v for the inputs and speed control to work

You can buy them from China as well:- https://www.aliexpress.com/item/5-Ax...ceBeautifyAB=0

[cropwell]

Like this;- https://www.ebay.co.uk/itm/5-CNC-Axi...4AAOSwaxlZiq98

Probably shipped from China (their Engrish warehouse).

[john swift]

this BOB
https://www.ebay.co.uk/itm/5-CNC-Axi...4AAOSwaxlZiq98

is the type of BOB I would use





it looks like its a version of this BOB found in some control boxes supplied with some 6040 CNC machines



the TX14175 has the advantage of having a 5V to 5V DC converter to provide the isolated 5V supply for the 75HC245's
instead of taking a 5V supply from a USB port


the HDBB2 looks good
I am not sure why they have used a expensive 36 way centronics connector instead of a 25 way D-type connector


John

[Radu_Andrei]

Ok. Thank you. Will order today. :)

[Radu_Andrei]

Hi again.
I.ve build the metal box and reorganized everything, and wired the new Bob. It seems the motor problem has gone, but will post a video soon and let you be the judge of that.
Now, I.ve wired the Bob like in the photo attached, and I.m not getting any response from the input pins, from none. P10 to 15 are not seen in automated setup in mach 3.
I should know the answer from the first picture from post 49, but the truth is that I don.t. :(

What am I missing?

[cropwell]

If you are using the BoB in the picture, you will need the 12-24v input to work the LEDs in the output opto-isolators. It looks like you have a fault there. Also check that the GND connections are all together, except for the PC ground.

[john swift]

the USB cable powers the two 74HC245 octal buffer IC's that connects the printer port outputs to your stepper drivers

the 12 to 24v supply is required to power the five input opto-isolators
& the PWM to 10V analogue converter that's controlled by pin 1



when a switch grounds an input current flows through the opto-isolators LED so the NPN photo transistor is turned ON
so the corresponding printer port input is grounded

when the switch is tripped and opens
the printer port pin goes high
(set pin as active high in mach3)



John

[Radu_Andrei]

It has the 12 v input, a light is on on the bob at the end of the input pins. It makes a subtle high pitch noise when I connect any of the input pins to the ground pin, but it does not register it in mach 3.
All grounds are together, but now I.m testing it with a single wire.
Pc gnd is not connected to anything.
The only difference with this bob is that it has a P14, to which all I ran all ENBL- from the drivers.