Another project is finally finished: SIEG X2 aka MINI MILL BELT DRIVE CONVERSION.
The original SIEG X2 DC motor prematurely left me with a piece of junk, cause to carbon brushes spikes. I tried to change mosfet, but after another set, i decided to convert this machine to belt drive.
The new version uses a 750W motor (1HP) with a Mitsubishi VFD. In the post, video of operation and make of.
A long waited fab for PCB, etched in house using a 5W visible laser (450nm), diy chemicals. The process is straightforwarding and really precise. I started with black spray paint, then lasered with FlatCam and GRBL, then etched with hydrochloride (33%) and hydrogen peroxide (130 volumes, difficult to find). Videos at the end of the post. A great result: total time approximately 30 minutes.
Blank one side PCB
Tried two spray paint. The right one is the best, matte black acrylic paint
Just sprayed
Cutted and ready to be ablated with 5W laser
Ablation in progress (previous photo without support). Air assist is really necessary.
The 5W laser is ablating spray paint @ 100% duty cycle - feed: 700 mm/min, but i tried also 30% duty cycle and it worked.
Ablated pc, design from kicad with FlatCam
Ablated pcb. Before etching, i cleaned it with peroxide @ 3%
Etching, only ten seconds
Before etching, I've heated @ 40 degrees Celsius
Etched and rinsed in tap cold water
Cleaned with acetone (nail solvent) to clean residual paint
Close Up
Cutted (by hand this time) and drilled with 0.9
Next steps: soldermask and white text and double sided pcb.
