CNC Control Board Advise

Hi Everyone

I have a 6040 machine with a BSMCE04U control board.

I'm currently looking changing a few things:
1. Limit and maybe Home switches (I see you can't use the same switches from another thread in here).
2. Auto Z probe.
3. Replacement Cooling Fan (Currently is a high speed 60mm).

Sorry if these are stupid questions but I would like to make 100% sure of a few things before I cock anything up.

1.1 Everyone seems to say that normally open switches are a bad idea but that this board uses them. Is there a way to use normally closed switches (have ordered ones with both) but have a inverter or some such in line that converts that to open for the controller (effectively a Not gate) or would that just add more complexity there by eliminating the benefit of a normally closed switch?

1.2 Do the inputs/outputs matter? All of the diagrams have Input 2 for limits and 3 for Home ect but does it really matter since you have to map everything in Mach3 anyway? If you want to to add say a output for coolant ect (via relay) could you use Output 1 or 4 which dont show on the diagram or an alternate input for whatever reason.

2. Probe seems easy enough other than maybe editing a few scripts and Youtube seems to ahve that covered.

3. The board has a few connections that dont seem to be documented (10V and a Ground, see attached) . I'm assuming the second ground is just a standard ground but with the 10V is that an output generated by the Board? The second diagram attached seems to say that it is (must connect 24V or the 10V will not work) . Any idea of max Current output? I would like to replace the 60mm fan with a 12V 120mm fan ( 0.3-05 A most likely) for quieter operation and run it at 10V (save adding another power source). The 60mm fan also seems to cool 2 of the 4 drivers and the 120mm should hit them all and pull more air.

OK, I have answered some of my own questions in case anyone cares or the great internet needs to know.

1.2 Found a page that mentioned that the outputs are general purpose. Guess you can just use them for anything.
3. 10V port is the speed control signal for the VFD. 0-10v depending on spindle speed so I guess thats out.

Sort of answers both. Would have been nice if they labeled diagram
https://www.hobbytronics.co.za/Conte...%20-%20Red.pdf

Quick Update

For the Inputs at least they do seem to be mapped to specific functions in Mach3. In4 is the Digitizer for example as per the diagram linked in my last post.

I'm guessing the same would not be true for the parallel version as those pins need to be mapped.

hi good afternoon all

today I bough a Laser 15w for EBay it has a pmw input but I'm not sure how connect it in my red board bsmce04 bit sensor

somebody know how I can connect it, currently I have spindle connected in my cnc 6040

thanks

having looked at your photo of the laser control boards TTL inputs

this is how I would connect the BOB / motion controller to the Laser control board

assuming the Laser TTL input is like a TTL logic IC and is at logic 1 when open circuit

and logic 0 when grounded

Attachment 427910


John

PS
whats the part number of U5

Attachment 427914

hi John thanks

Well the TTL my understand is only for on/off the laser, but I try to found some method to regulate the intensity and the PWM help to regulate it to 50% or 85% etc.

Do you believe the bellow connection works correctly?

You know which is the function of the terminal AVI and ACM and also which is the voltage.

Thanks, Regards.

AR

It looks like that should work

both 2 & 3 pin connectors are labelled TTL/PWM on one pin
and a pin labelled -
which will be the common signal ground



To me TTL has 5V logic levels like the 7400 series logic IC's

if I remember correctly
original 7400 series

0 to 0.8V = logic 0 = low
3.4V to 5V = logic 1 = high

with PWM

the output is switched at a fixed frequency and
the ratio of on to off time varied to convey an analogue level

0n 1% and off 99% of the time will be the lowest value and
0n 99% and off 1% of the time will be the maximum value

John

Hi AR, did this work?