I am sure it can be done.
Has anyone made external speed and feed over-ride controls using potentiometers?
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I am sure it can be done.
Has anyone made external speed and feed over-ride controls using potentiometers?
Not sure if there is anything out there already, but it may be better to look at the common commercial O/R method of using a Binary switch, 4 bits give you 16 steps/switch.
Al.
I will design a method. Just thought there maybe a way it is typically done already. No point reinventing the wheel, so to speak.
Needs to be at least 8 bits to be fine enough to be practical.
I suppose you could up/down button, but that is not nice, and the latency would make it awful to use.
An 8 bit switch if it must be digital.
Can always make an 8 bit output A/D converter, but it will need gray code output so every step is different. Then how do you feed that into Mach3?
That is a lot of bits for 2 pots, using a parallel port.
USB, maybe, but will latency be an issue?
I suppose an MPG type input could be made to work.
The easiest way is probably with a Pokeys.
PoLabs - Affordable PC USB oscilloscopes, logic analyzers and USB interfaces
They have analog inputs and apparently work well. Never used one, though.
I see there is a plugin for Contec PIO boards, I am surprised that by now no one has developed a PC Based PLC for Mach using these cards.
All the preferable operator hard wired functions such as feed hold and feed overide, spindle O/R etc could be done digitally this way without messing with analogue inputs etc.
A resolution of 255 is hardly necessary for most overides.
Al.
The PoLabs idea looks good with the plugin, and 10 bit is more than adequate!
Any other ideas out there? Now we are getting somewhere.:)
Looks like you can use a ModIO as well.
Touch Screen and panel controls using ModIO - MachCustomizeWiki
MC-01 ModIO Controller [MC-01] - US$98.00 : Homann Designs!, The preferred CNC Component Supplier