Dining table inspired by the Greene & Greene Thorsen table #2: The First Derivative

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Blog entry by TungOil posted 02-07-2017 12:16 AM 2194 reads 1 time favorited 2 comments Add to Favorites Watch
« Part 1: Designing the dining table Part 2 of Dining table inspired by the Greene & Greene Thorsen table series Part 3: A Visit to the Hardwood Dealer »

I think every project I have ever done has led me on at least one tangent, derivative project. This one has already spawned it’s first……

Since I have not used my vacuum bagging system for quite a while, I decided to pull all the equipment out and look it over to make sure everything was still in good working order. When I set up my system originally, I went really basic- an old roughing pump from a mass spec coupled to a home made bag fabricated from heavy plastic drop cloth material sealed up with packing tape. The pump ran continuously during the duration of the glue up, and I had to top off the pump oil level every couple of hours. In addition, oil bath vacuum pumps emit a plume of fine oil mist as they are running- not the sort of thing you want settling on the lumber and tools in the shop, so I had to plumb the exhaust outside to keep things clean.

It was time to upgrade my system with some more sophisticated controls and a proper vacuum bag. I poked around on the internet for a while and came across Joe has put together his “Project: EVS” instructions for putting together a vacuum system with pressure controls that will cycle the pump on and off to maintain vacuum. He also sells a kit of parts that include most of what I needed to assemble the system. Seemed like a good way to go, so I ordered up the parts.

Assembly was easy and took just a few hours.

I changed around the layout slightly to better suit my equipment. In addition, I wanted to fully enclose my electrical for safety so I added a junction box big enough to house the switch, relay and vacuum switch.

I started up the system and adjusted the vacuum switch to shut off at 21” Hg, the recommended setting.

I let the system sit overnight and checked it in the morning and had only lost about 5” Hg, so I’m pleased that my piping is well sealed.

I also ordered a heavy duty vacuum bag kit. I’m ready to start vacuum bagging my table top cores.

That’s it for now!

-- The optimist says "the glass is half full". The pessimist says "the glass is half empty". The engineer says "the glass is twice as big as it needs to be"

2 comments so far

View CaptainSkully's profile


1615 posts in 4804 days

#1 posted 02-07-2017 04:21 PM

“Derivative” gave me shivers remembering my Differential Equations class in college.

I bought the large vacuum bag kit from Roarockit and love it. Less moving parts and easier to store.

-- You can't control the wind, but you can trim your sails

View Mean_Dean's profile


7057 posts in 4392 days

#2 posted 02-07-2017 05:42 PM

It’s gonna be interesting seeing this vacuum process in action!

-- Dean -- "Don't give up the ship -- fight her 'till she sinks!" Capt James Lawrence USN

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