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Messages - OHICAD

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1
Bargain Basement / Re: larger mill, lathe available
« on: June 01, 2021, 06:30:43 AM »
Are you just wanting them gone? If so, might be able to do something.

2
Alright, since I bought the app I took a look and it's thankfully simple.
The app acts to emulate a bluetooth keyboard as far as the connection is concerned, this means that you need to have keyboard inputs enabled.

Here is what is mapped to what  (keyboard button = app button):
b  = reset
j = stop
i = pause
h = play
l = spindle on
m = spindle off
k = home
g = rapid rate increase
f  = rapid rate decrease
e = feed rate increase
d = feed rate decrease
PageUp = Z+
PageDown = Z-
LeftArrow = X-
RightArrow = X+
UpArrow = Y+
DownArrow = Y-

If I have time I'll setup the keybinds in script and post it up here.
Still bloody annoying for the dev to not have any support or instructions up.

Good luck folks.

3
Documentation no longer available and OP not responding to support requests.

4
Mach4 General Discussion / Re: Slave misbehavior
« on: April 08, 2021, 09:47:00 AM »
A reasonable solution

I'll give it a shot then, thanks.

5
Mach4 General Discussion / Slave misbehavior
« on: April 05, 2021, 11:28:52 AM »
First off, functional information on the machine.
ESS Smoothstepper
C11G for controls
DMM Servos and drivers
2 motors driving y axis gantry, single motor running x axis and another running z.

So here's the issue, I need more inputs so I got a C25S board. I changed the port the C11G was plugged into from port1 of the ESS board to port3. I then changed the pinout and all details in Mach4 to reflect the change of port.
Here's where it gets a bit odd, the slave motor on the y axis starts moving just a brief pace behind the master when moving the y axis, bad enough that it faults out the drivers on occasion.

I've set things back as they were and reloaded my backup from before I made any changes. All back to normal now.
Any ideas on what to look at that I may have missed?

6
Mach4 General Discussion / Re: Planned expansion board
« on: April 01, 2021, 06:37:31 AM »
Alright, so I've taken you guy's input and I'll be giving the board a rethink. I'll post up a new thread after I plan it out to get some further input.

Keep being awesome guys.

7
Mach4 General Discussion / Re: Planned expansion board
« on: March 29, 2021, 04:18:58 PM »
Sorry, brain edited out a couple important things.
ESS smooth stepper driving a C11G and this is intended to compliment a C25S that has not yet been installed.
I'm trying to make damn sure I've got all the things thought through before I change anything.

8
Mach4 General Discussion / Re: Planned expansion board
« on: March 29, 2021, 02:29:25 PM »
Steve, that diode is not across relay coil :)

Attached is the schematic how it should be connected.

BTW I don't like the routing, and you have a common ground which voids opto isolation.
Even your board does not look like schematic that you used.
What is the 12pin connector for? Are you going to place wire links from that one to 8pin one to establish connection for series resistors for opto couplers?

As I've said, electricity isn't my first language, so mistakes are due to ignorance. I really do appreciate you folks taking a look and having a think on what I'm doing.

The inputs are to the PNP proximity sensors. The manual for the C11G BO board I'm using requires a 27kOhm resistor with those 24v sensors before it gets to the board, so that's what the 12 pin connector is for. Rather than adding another separate board to manage those I'm trying to consolidate it to one.

The board I'm pulling from is a source, but I didn't directly copy and paste it since I wanted to do more than just have a relay board and eat up real estate with another board for the sensors and another for the driver pin out and another for the tool changer, etc, etc, etc.

9
Mach4 General Discussion / Re: Planned expansion board
« on: March 29, 2021, 01:37:52 PM »
The PCB traces to the relay contacts could be wider, especially the one from the 24V input which is common to all. I am guessing you will have only light logic level loads but if you control large solenoids that should be addressed. A dead short might destroy the common trace, a fuse would be good if your 24 volt supply can supply high current.

There are multi-relay opto isolated boards on eBay that would likely fit your needs.

If you have parts and are trying to save this design tell us more about what you are connecting to the inputs and outputs.

Outputs are going to a bit of a gas piano controlled by these:
https://www.smcpneumatics.com/VQZ2151-5LO1-Q.html

Inputs are a bunch of 24v PNP sensors to replace the old NAMUR sensors that were originally there and lost their translator with the old black box controller.. Currently everything is getting mechanical limit switches that have WAY too big a variance for my comfort.

The primary aim of building an expansion board is to avoid/eliminate the rats nest that I had to clean up previously, further I'm not adverse to ripping up the existing board traces and reworking them. I left a significant amount of room on the traces anyway and could likely just expand the size based on recommendations.

Lastly, thanks for pointing out that I grounded everything on the same circuit. Considering I've got the single 24v supply point, where else would I ground it? Chassis?

10
Mach4 General Discussion / Re: Planned expansion board
« on: March 29, 2021, 08:56:56 AM »
The external diode is not needed in this case. There is a diode inside the ULN2803 between the output and its COM pin which is intended to serve this purpose. Just connect the COM to your +24V or whatever is the positive supply of the relays.

I shamelessly borrowed the basic design and logic from a existing open source opto isolated relay board that fit my needs (ref: https://www.electronics-lab.com/project/8-opto-isolated-relay-board/ ), so I can't claim full credit for working through all the engineering behind it, I know just enough to grab the parts I think I need to make it work and then shuffle it around a bit to make it fit my application.
I try my damndest to figure out the how of the functionality while I'm at it.

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