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Nearing 8 months ago I had my Z axis stall on with my old stepper drivers which were only 30 volts and weren’t enough for my machine.
In the end the machine was was cutting 1″ thick MDF in one pass with a .25″ endmill, nicked my Y axis slides, and the acme drive screw. Everything is working nicely with some sanding and buffing, however, I’m if stalls are bad I can’t think of what a controller fault could do !That would be great to see what happens with it 🙂
https://www.dropbox.com/s/x0tuftjne9brvj9/1_8FP.ngc
This is a LONG program so maybe just the first part and when it hits parallel passes?
If this all works out I’ll be more than happy to show off what TinyG can do on my machine.This subject isn’t something I’m very experienced with so I’m attempting to get some conclusions drawn up 🙂
I’m 21, have a few years of college for a business degree, and then there is my two years of CNC experience;
but past that I know nothing about CNC machine control software/hardware. My experience is how poorly exact path mode is in LinuxCNC and how shaky my machine would be if I used it.
If TinyG operates smoothly for 3d profiling then that’s what I want.
For the experience I’m thinking of just picking up an arduino due then seeing what an axis does under it’s control.Hmm. I do a lot of organic shapes that aren’t at all square.
I am trying to wrap my head around this so here it goes.
So TinyG goes point to point without any “curves” (smoothed interpolation is the term I think of since I used to do computer animation) between each point or gcode line? If I were trying to switch over I’d need to control my milling speed by how many points or “accuracy” (EI Gcode lines for the modeL) since the controller WILL hit each point. So in essence what separates it from exact stop mode? Between each point will I get a straight line or a curve? If it went up and down a “bump” would it go straight from each dot or naturally follow the arc to a certain degree? How will LinuxCNC fair against TinyG overall with speed if they are both being fed a reasonably smooth program?
Just to show I’m not crazy here is a bit of my work, it’s an island that’s 50 miles from where I live.
.125″ ballnose bit, .003″ accuracy, and I was getting maybe 80IPM for 3d profiling but the machine likes to shake some :/
I am hoping to just disable the driving chips and use my current drivers that are more robust. Years ago I’d just do it and have wires everywhere. However, I’m polarized against rat’s nest of wires since I’ve been living so ghetto with my small business that’s centralized around one CNC machine and slowly I buy stuff to organized my setup 🙂 The chips the TinyG uses probably aren’t a match for Geckos or THB6064AH when at 48 volts so I’d like to stick with what I use. When I did a motor swap and some other work I went from 30 IPM of cutting to about 130, and I don’t want to ever go back.
For the atom board I think it’s fried or maybe something else since it powers on but only shows the intel screen, then the BIO config screen if I strike the key fast enough, then the screen just stops working before it loads ubuntu or even if its in BIOs for 2 seconds. I’ve tried two LCD monitors and can confirm it’s not them. Next step I guess is to try a new stick of ram and remove the SSD, then boot of a CD. But I really think it’s the onboard GPU unfortunately 🙁
But with a TinyG I can use any cheap netbook that stays on and not worry about latency!
