Parts needed. Power supply and USB board.

[Clive S]

Ok thats confirms most of what I understood. Just a bit confused about BOB. https://onedrive.live.com/view.aspx?...PSeNu5hZHOhv5k seems to show a BOB but also a controller conmbined ...
.....but is that what a BOB is and I have a really cheap one on the chinese CNC box??

Andy What you have shown is just a BOB with a few whistles on it. BOB stands for break out board or in other words if you like a simple junction box. To keep things simple can you not put a PP card in you pc. You need to put some better pictures up. Have you tried to power up what you have? Are you happy playing with electrics?

[JAZZCNC]

Ok thats confirms most of what I understood. Just a bit confused about BOB. https://onedrive.live.com/view.aspx?...PSeNu5hZHOhv5k seems to show a BOB but also a controller conmbined ...
.....but is that what a BOB is and I have a really cheap one on the chinese CNC box??

Ok this a common misunderstanding new comers make when they see boards with USB connections.? . . . Clive is correct that's just a BOB which draws it's power from the USB, it doesn't take signals from the USB port only the 5V it needs to run.
This in it's self is not a good thing either as the USB port is unreliable at provideing a stable power source due to way PC's manage energy so turn off the USB port while in-active and because the board is only drawing power not signals the PC thinks no activity is happening so powers down the USB. If using USB you must change the PC's energy saving mode.
BOB's and inparticular motion control cards are best powered from a separate power source. Some BOB's can be powered by higher voltage source than 5V and will take there power from the PSU driving the drivers.

Also not all BOB's require power.? Those that do usually need it to power the opto isolators that protect the input and outputs or for powering on board relays etc.
Yours will either take it's power from the 24V PSU or not have any at all in which case it's a basic cheap n nasty BOB.!!

This one you highlighted before is a BOB and motion controller combined. http://www.shop.cncdrive.com/index.php?productID=367

[JAZZCNC]

Ok I've just looked at the video to see what the fuss is about. You don't actually need any steppers, drives or even a PC to control this.
A PLC would do this with no other hardware required other than a PC to program it then it's a stand alone unit.

The PLC would turn ON/OFF normal motors based on inputs IE button presses or switches and how it's programmed would determine the action it takes regards the time and direction the motors are ON/OFF for. It could be made fully automatic with Switches or semi via buttons. PLC's excel at these tasks.

It could also be done using relays and controlling via outputs/Inputs from the PC with no steppers or drivers involved. This means you could use the Serial port or the USB has there are no timing issues involved just simple ON/OFF signals. The Control software would then just turn ON/OFF outputs via G-code and using the Dwell and M commands for the time period required. It could also be made to respond to inputs Ie: switches or buttons so it's fully or semi automatic process.
In affect the PLC is the same with a inbuilt control software which you program directly.

Also an Arduino would be perfect for doing this simple task but would require a little programing.

[EddyCurrent]

Imagine a car engine with the table being a piston. Press a button and a geared motor does one revolution, stopped by a limit switch. This drives a crank that starts at the top, goes down, then back up, taking the table with it by way of a con rod. 'Depth of dip' is controlled by changing the height of the liquid container.
Semi automatic but cheap and easy.