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Messages - flyingthinktank

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1
Thank you so much! This is very helpful info.

2
I'm a hardware guy, so the PLC would be my route, but I have at least 1 programmer on my team so we might end up trying a software route as well.

How would I receive the step pulse signal? Can I have it set to be output to more than one pin on whatever I'm using as the CNC brain, like a smooth stepper?

3
Thanks for the reply, Tweakie! Is there anywhere that I can get more information on that? That sounds like it's just what we need. Was this done via a script in Mach3/4? Is Art around to chime in?

Thanks,
     Tim

4
Hello, we have a small-ish 3 axis gantry system that we've adapted for 3D printing. The 3D printing method is direct ink writing, which is kind of like making things by squirting out toothpaste in the shape you need. The extrusion is controlled by air pressure, and I was wondering what it would take to control the air pressure based on the velocity of the nozzle (the "tool").

Basically, I'm wondering what's required in order to have a PWM output that is adjusted on the fly based on how fast the tool is moving. That way, when putting down a line of material, the pressure is slightly lower when the tool is accelerating and decelerating, but at full strength when the tool is at full speed. Without it you end up with blobs of material whenever there's a direction change.

I'm wondering if this is something that can be done in Mach4 (we'd be buying a license if it has that capability). If using Mach4 and an ESS, would a PLC also be required? I'm trying to find the right combination of hardware and software to do this so that we can rip the current brain out of the machine and plug the steppers into something that'll give us more flexibility.

Thanks,
     Tim

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