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JCDammeyer's 42 projects

jorogi said:
Not ! You claim you always know where everything is. Organised chaos. :p
Click to expand...

Nope, you are not reading me right. Yes, I do love organized chaos. That doesn't mean I like things hidden away in drawers where I can never find them. It means I prefer piles of stuff on surfaces. My chaotic organization is situational not everything has its place.
 
Almost one item ready to be taken of the list of 42 projects. I've wanted to consolidate the BoBs, MESA 7i92H and power supply to connect to the Raspberry Pi4 mounted to the back of the touch screen. Otherwise I have wires all over the place and stuff is loose. Just begging for magic smoke.

So today I installed all the stand-offs and mounted all the boards. There is room for a Pi with a CAN bus Hat in the middle if I decide not to use the small 10" touch screen. But it's progress.

Tomorrow I'll wire up the power supply and connect it all together. Ultimately this may run the CNC router or a small mill.
PanelStage1.jpg
 
There we go. All wired up. And clearly the power supply that both runs the Touch Screen and the Pi4 isn't up to snuff as the Pi4 is constantly complaining that the power supply voltage is too low.

The proper way of course to wire up the BoBs is not to generate the 5V for them from the 12V supply. Kind of defeats the whole idea of optically coupled and galvanic isolated I/O. So the right thing to do is probably get a 5A 5V supply and run the BoB's and Pi4 off that.

Notice the Blue Dongle. That's a CANUSB and there is code I've written for the LinuxCNC that sends and receives CANOpen messages to control the tool changer. That's one of the reasons I wanted this. So I can play around with all this.

PanelStage2.jpg


At this point I can set this aside until I finish a few other projects but at least now when I start it up again I don't have to look for cables, boards etc.

Many years ago (2005) I manufactured devices called WORMs. To program them I build an XYZ system that automatically programmed the panel. Used surplus stepper motors from PA. MACH3 for the CNC motion. Ultimately it was too slow and faster for me to just move the head by hand from board to board. Had I used good stepper motors and 5 TPI screws it would have been different. The whole XYZ system was disassembled and the pieces scattered here and there.

But now I have the infrastructure to build something similar again. But this time I would do the mechanics different.

Here's a very slow boring video if you want to lose just over 2 minutes of your life.
 
Progress on the filament rewinder project. My friend JoMac printed the first version that used a mechanical screw tracker to move the filament back and forth. It moved too far on each turn of the take up reel.

Now the Arduino code is pretty well done and there are 12 magnets in the take up hub so every 10th of a turn the stepper motor moves the guide over 0.175mm. That's been changed to 0.178mm because when I asked at the Matter3D open house yesterday they explained trial and error found 1.78mm filament spacing worked better than 1.75.

There are still issues. JoeMac is designing a new take up frame that is more robust. We're going to have to move the supply spool further away to make things less jumpy.
WinderProgress.jpg
The Arduino UNO R4 is more than up to the job.
UNOR4-Controller.jpg
Also included is the schematic.
 

Attachments

My friend JoeMac has done the rake-up assembly in Fusion and exported it as a step file. I've added the hole for the filament to exit out the side if the take-up reel doesn't have a hole in the drum. This base is far sturdier and shouldn't flex when hand cranking this puppy. The original flexes enough when cranking that the laying of filament evenly doesn't happen after the first few layers. He's also added a clip in hold down for the one side to make pulling the heavy reel out easier.

I'm going to print this new base in PETG since it's also a bit stiffer although I'm tempted to use PLA Carbon Fibre. But we're still working on the idea of a motor mount.

1743987577711.png
 
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