- It didn't look ugly,
- They worked,
- Easily got at and unplugged, in case it didn't work
- It wasn't going to get hung up, damaged, shorted, cooked something
- They kept working.
An ideal area for the electrics was what used to be occupied by the old power supply (woefully under powered for this task) and all the messy bits of the printer, such as an ink scraper that had what can be best desrcibed as a biohazard in its little collection pot!
As you can see, plenty of room for the boards, a 200W PSU, some room underneath for excess wiring storage and a power bar. I also hooked up a small jumper cable for a power switch to the earth + green wire from the ATX plug.
I tied 3 wires each of the red (5V), yellow (12V), 2 wires each of black (x 2) and wired them onto the power bar. There's plenty left on the PSU loom of I want to do something like wire in the UV light strips I have when I was modding CPU cases :-)
Next thing was to make up some tidy, yet practical plugs for the CNC shield. This thing is in a tight space, so I don't really want to be messing around with single header pin sockets. So here's a good tip..and made life so much easier..
Get some of these..
Thread 2 bits of heatshrink onto them..
Heat the big bit first until it wraps nicely around the plug ends, then seal off the scruffy end with the smaller bit of heatshrink. Viola!
Now you can plug/unplug them as a group, they don't flex as much when you try to plug them in, and they stay in the right order.
I made up another plug for the emergency stop, hold, resume and abort pins (hidden behind the plugs in the photo) I was able to use the original printer control panel buttons and attach them to the CNC pins.
It was just a matter of working out the connections with a multimeter, and making the life changing decision on which button should do what. I figured the E-Stop button should be the biggest one...'cause it's easier to hit in a panic.
I've already used it twice when I messed up my endstop switches!
On that note..if you have no previous CNC experience, please get your endstop switches sorted before playing. Nothing is more distressing than seeing your creation attempt to wind the ends off your machine. I'm only using the smaller Nema17 steppers @ 4.8kg/cm torque. On a 6mm, 1.5mm pitch threaded rod, that's a lot of grunt.
Next...the final words.