Robo-Pavoni; learning to make espresso machine from scratch - Page 2

by **Droshi** on Sun Aug 17, 2008 11:42 am

I'd like to see a detailed walk-through for drilling that pressure gage into the GH. If you're taking requests

by **matadero210** on Mon Aug 18, 2008 9:17 pm

A quick reply: use two drills, one superfine from the bottom of the head, and the second 0.125 from the side. Hope they meet and drill carefully while paying attention to desired depth. The superfine hole should be outside the piston shroud, but inside the screen and o-ring. Once you see daylight, epoxy a 0.125 stainless tube into the hole and add a gauge.

by **Droshi** on Tue Aug 19, 2008 3:45 pm

Very much appreciated.

Do you have any problems with coffee grounds getting stuck in that small hole? Looks like it would be the best spot for it, but I do still get grounds up in that channel after some shots.

by **matadero210** on Thu Aug 21, 2008 10:59 pm

Grounds may get in there, but I've never had a problem with that. 10 bar keeps the tube clear. The volume in the gauge fittings is filled with water, so very little displacement is needed in the tube.

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