Making a Metering Valve

I picked up the super common, super cheap Harbor Freight sand blasting cabinet to replace the really small one I had recently. I had already found a lot of videos on how to improve the product with some making lots of sense and some completely off the wall and costing more than the original product.

Primarily I knew I wanted to 1) Added a metering valve suction feed instead of the pipe that I always had problems with in the small one, 2) Move my small shop vac dust collector setup over to help keep it clear inside, and 3) add some type of dust separator to avoid filling up filters or bags too quickly.

Version 1 Valve Attempt
Version 1 – First Attempt

After looking at the options for metering valves online, they seemed really simple. However, searches on ThingiVerse and around the net really didn’t result in any 3D printable solutions that I liked. So I fired up TinkerCAD and played with some options.

My first clunky design likely would have worked BUT I wanted it to look a bit better and have a better tapered feed to the output so I started from scratch, found a pipe and threaded cap that seemed to fit the bill and added the features I thought were needed to make a valve work.

The final design looks better and likely will work better in the long run. No telling, the plastic may get ate up from the aggregate flowing through it all the time but the cool thing is I’ll just print another one when/if that occurs.

The shop vac exhaust was the next step and just required a couple of 90 degree adapters to mount to the exhaust port and then to the dust separator. This seems to be working fine so far but obviously time will tell.

Metering valve mounted and working
Exhaust adapter mounted and working
Elbow and dust separator working

Deployed Luftdaten / OpenSense Map Sensor

On 08/11/2019 I watched the famous (infamous?) Frenck (http://www.youtube.com/frenck) live stream his work on a SDS011 Particulate Matter Sensor. I had already noticed the sensor in the ESPHome support list but Frenck was taking a different approach. He was live streaming getting the device working for the Luftdaten.info project of tracking air quality.
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Welcome to Protowrxs . com

Jack of All Trades – Master of None

Pretty much sums up my life and I have no apologies about it. I’ve enjoyed many different hobbies, have become good enough at most, and hope to keep on keeping on for some more years or decades before I’m done.

Here you’ll find information from 1/24 scale plastic models to full scale cars being built. From old bicycles to old bicycles with 1 kilo watt of electric power. From simple electronics to a smart home that has been “Online since 1999” – long before many were thinking of ‘connected’ homes.

I have built many little robots, big RC mowers, have a couple Trail 70’s being restored or rebuilt. I have a smart home that knows when I’m here, can listen in different apps and handle things when where are not here.

I have way too many 3D printers that have all been built, designed, or modified by myself, and even some old time stop motion animated “brickfilms” for you to enjoy.

Poke around – you’ll find many different directions, unfinished projects, and a mess of other ideas floating around here.