topbanner.gif
Login
Username

Password




Not a member yet?
Click here to register.

Forgotten your password?
Request a new one here.
Shoutbox
You must login to post a message.

09/28/2020 9:48 AM
Working on site improvements, bare with me. smoking

09/28/2020 8:58 AM
Where are the old themes ?!!! Shock

09/28/2020 12:46 AM
Made some changes, shoutbox was working without verification.

09/27/2020 2:53 PM
A lot of shoutbox spam attacks lately. roar

08/28/2020 7:15 PM
I have updated my signature and added links to the KKTO roaster build

Users Online
Guests Online: 3

Members Online: 0

Total Members: 6,748
Newest Member: Ivanwrowl
In Memory Of Ginny
Donations

Latest Donations
Anonymous - 5.00
Anonymous - 5.00
renatoa - 2.00
JitterzZ - 2.01
renatoa - 2.00

View Thread

Who is here? 1 guest(s)
 Print Thread
Stepper or RC servo driven needle valve
allenb
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.towerhobbies.com/cgi-bin/...gIQuvD_BwE

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
renatoa
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.com/en_us/cnc-alloy...utaba.html

The actuating servo is this, fitted with a similar arm as the valve:
https://hobbyking.com/en_us/bms-620mg...c-50g.html

And a ball head steering linkage between the two arms:
https://hobbyking.com/en_us/steering-...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.pololu.com/product/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:
gas_valve.jpg

Edited by renatoa on 06/13/2018 7:21 AM
DIY: TO based IR 750g
Moded commercial: Dieckmann RoestMeister, Nesco, popper(s).
TC4ESP, MS6514, USB/Artisan/Apps, PID controllers
Grinder: MBK Feldgrind, mod'ed Porlex to 47 conical burrs, vintage PeDe Dienes, Kinu M38
Gaggia Mini, Aeropress, drip
BobbyS
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
Jump to Forum:

Similar Threads

Thread Forum Replies Last Post
Flow Meter/Needle Valve Combo Electric and Gas Heat Sources 5 08/19/2020 4:27 PM
Valve bags-Where do you buy? Storing Roasted Beans 19 10/31/2019 6:09 PM
Heat Gun Driven Fluid Bed Roaster Fluidbed Roaster 26 03/07/2019 8:24 AM
Proportional Solenoid or Needle valve? Electric and Gas Heat Sources 5 11/27/2018 7:12 PM
TC4 + Clippard EVP Proportional Valve + EVPD Valve Driver Dataloggers/Controllers/Rate of Rise Meters 36 06/08/2018 11:50 PM
Homeroasters Association Logo, and all Content, Images, and Icons © 2005-2016 Homeroasters Association - Logos are the property of their respective owners.
Powered by PHP-Fusion copyright © 2002 - 2020 by Nick Jones.
Released as free software without warranties under GNU Affero GPL v3.
Designed with by NetriX