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??
To do what you intend to do you don't need a CNC.
- Solder 2 steel pipes to a base. Make a structure that slides on the steel pipes and will hold the work. Cheap geared motor at the top where at the same time holds the steel pipes together, steel wire from motor to sliding fixture. 2 buttons -up and down. Thats all.
-next step would be 1 axis Galil controller, 2 limit switches, program the controller, stepper, drive and PSU.
About the machine you obtained, its been said many times- change drives, psu, board. If it was any good it would not be in this condition on the first place. Who know how many times the previous owner exchanged and blew cheap junk parts. As you have it right now the wisest thing to do is buy what Dean suggested somewhere
http://www.zappautomation.co.uk/mx66...ng-driver.html, its BOB and drivers in one. So you will need PSU only.
About the USB. You have got it all wrong there. It does not offer real benefit. If you read forums a lot you will see that USB controllers have problems. A lot.
You need a separate dedicated PC for the machine or you will constantly experience problems in the future. A cheap 20GBP PC from a boot sale will serve without any problem ever with LPT. Or Ethernet controller, if you really want something good..
If you insist on going on the cheap at least buy from somebody who can offer you support for what he sells http://www.zappautomation.co.uk/elec...ut-boards.html cause really if you buy cheap board from ebay or ali express i will congratulate you if you even make the board work. I know from personal experience.
Last edited by Boyan Silyavski; 14-10-2014 at 06:37 AM.
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
Last edited by JAZZCNC; 14-10-2014 at 08:50 AM.
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.
Last edited by JAZZCNC; 14-10-2014 at 09:24 AM.
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.
Last edited by EddyCurrent; 14-10-2014 at 01:03 PM.Spelling mistakes are not intentional, I only seem to see them some time after I've posted
To explain why I think Jazz is right , whilst I realise a simple system like eddy describes will work, I am looking to future proof etc. "(opening up the potential whilst learning CNC commands at the same time. I had factored in the loss of depth of paint and though I would jog the float tips to the liquid and then program in 2mm for example. Instead of assuming the height of paint would remain constant. I am not going to be producing floats by the thousands but like to keep things automated to a degree..... I am actually using a drill press with manual limit stop to check everything works for now anyway ;)
Regards Andy T
As for learning G code with this system, well it doesn't cover many operations.
Having said that there's nothing wrong with playing about with stuff just for the hell of it.
Last edited by EddyCurrent; 14-10-2014 at 04:56 PM.Spelling mistakes are not intentional, I only seem to see them some time after I've posted
Yeah I tend to do that . But some times I have a need. I found this. http://youtu.be/WKdyBZvlFXk and this http://youtu.be/SCyGM2Tp37w and while its sort of well "naff", you know what I mean. Its has given me food for thought seeing how slowly it goes when combined with thread rod etc.
Shame that adafruit he mentions is not in the UK lol Well upon checking it seems they have distributors but it appears they dont sell the hardware...(only a quick look but not a good start! lol)
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