Help please. Dip switches and mach 3 settings

[john swift]

I would try another BOB that does not have opto-isolated outputs
and either has 74HC14 HEX inverters connecting the printer port outputs to the stepper driver inputs or 74ACT245 octal transceivers as used on the C10 BOB


the C10 has no opto-isolators on either the inputs or outputs


note this BOB

has a design flaw

if you look at the 74HC14 used for the inputs
the supply pi 14 is not connected !!!

see top left hand corner of the circuit diagram



John

[cropwell]

Has the enable been connected up yet ?

I would common all the +v inputs to the drivers and use -ve pulses to drive enable, step and direction. There again, I wouldn't use that BoB as it has no relay output (though these can be added with a cheap board) and no 0-10v speed control.

I happily use this board https://www.dropbox.com/s/gfq4isvihn...rd-EN.pdf?dl=0 and have only blown one of them so far (my own stupid fault). At least they are cheap

[Radu_Andrei]

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

[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. :)