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renatoa

09/14/2023 1:29 PM

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09/08/2023 7:44 PM

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Homeroasters - Home Roasting Coffee Community » BUILDING A ROASTER » Electric and Gas Heat Sources

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Stepper or RC servo driven needle valve
allenb	#1 Posted on 06/11/2018 7:57 PM
Administrator Posts: 3725 Joined: February 23, 2010	When pondering a suitable needle valve with fine control that could be controlled via stepper or RC style continuous rotation servo using pwm, I found lots of really nice valves and many costing way more than I was willing to pay. I saw a small needle valve advertised for use with RC engines for gas metering that I now use for my propane control needle valve for manual control on my 1 lb drum roaster. Never got around to trying it with a stepper or RC servo but they should work fine and have a small enough shaft that should make it easy to fit an appropriate coupling between the two shafts. The needle thread pitch is very fine making fine incremental control easy. Also has mounting facilities to screw it down easily. I'm using it with 20 psi propane supply pressure. This isn't the exact one I bought but all should be pretty much the same in how they operate. https://www.tower...gIQuvD_BwE Allen 1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana


renatoa	#2 Posted on 06/12/2018 1:47 AM
Administrator Posts: 2664 Joined: September 30, 2016	I am working atm with a friend to build him a solution based on RC stuff usage, but keeping the actual machine valve. His current manual valve looks like in the picture attached. Such arm was been placed on the valve shaft: https://hobbyking...utaba.html The actuating servo is this, fitted with a similar arm as the valve: https://hobbyking...c-50g.html And a ball head steering linkage between the two arms: https://hobbyking...buggy.html All the parts or similar can be sourced from a RC auto (buggy) shop. The servo is driven via usb, using this small board, and a command line utility: https://www.polol...oduct/1350 Placing in Artisan events dialog a command like: "UscCmd.exe -servo 0 {}", the servo can be moved according to burner slider or % buttons. All parts were bought, assembled and tested, we are now evaluating a servo mount solution. ... renatoa attached the following image: Edited by renatoa on 06/13/2018 7:21 AM Roasters: DIY: TO based IR 640g Moded commercial: Dieckmann RoestMeister, Nesco, popper(s). Electrics: TC4ESP, MS6514, USB/Artisan/Apps, PID controllers Grinders: Arco, Xeoleo ghost burrs, Krinder, vintage PeDe Dienes, MBK Feldgrind Brew: Flair, Kompresso, Rota Aeropress, Hario Cafeor dripper, Gaggia Mini


BobbyS	#3 Posted on 06/13/2018 6:54 PM
1/4 Pounder Posts: 179 Joined: July 02, 2011	Interesting project. I have a regular smooth operating needle valve with a large knob. I have a small stepper motor with a wheel I will connect to the large knob to operate it. Many ways to operated a valve

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