AndyUK's Build - 1.2x1.0m Gantry

[Kitwn]

Nice work!
On the cooling front I found that larger diameter piping (8mm instead of 5mm I think) doubled the flow rate from the same pump. Short restrictions such as the inch-long pieces that connect to the spindle itself made no difference but it sure made a difference over the main several metres.

I built a prototype GPS clock last year, link below. The GPS receiver is the little blue circuit board that appears about 26 seconds in. The pendulum is oscillating freely at it's natural frequency, driven by an electromagnet, but is still forced to run in perfect sync with the one pulse per second (1PPS) signal from the receiver.