here i will detail the construction of my new vac bed. (vac bed explained here)
I've wanted one for ages but never really bothered. It was not until a couple months back when i finally got to give one a try at a local fetish event. Once tried out i was hooked and had to do the build.
On to the construction;
Dug out two sheets of latex from my box black and silver. (both from different sources. One supplier: sheetlatex.com).
Figured out the height i wanted the bed to be: 80''
added 8 more for the top close (really want side but top is far more simple and quick)
so cut two pieces 88'' long.
Then clean and glued the log sides together with a 1cm seam.
Now i have a long tube that just happens to be 40'' wide
Close the bottom of the tube to complete the envelope. I did this by rounding off the corners and gluing everything closed. I had a bit of trouble getting the corners flat so i also added reinforcement patches on top of the corners.
next was off to the hardware store; got two 10' lengths of 2'' pvc central vac tubing. And fittings of course.
PVC tubing 20'
3x 90 fitting
1x tee fitting
now to cut the tube:
the 10' lengths worked out perfect. Was just enough to cut one side and one end from each. 40 wide – 2x2 = 36 and same for the tall side 80 – 4 (the width of the fittings)
Next was to assemble one end tube with two 90s and stuff it into the bottom of the envelope. I then marked and added glue in a small circle where i added a reinforcement gasket.
Once glue was done with the gasket i cut the hole in the envelope.
The gasket was made by creating a circle just a bit smaller then the hole i was planning to make.
Finishes for the vac bed;
Close the bag:
- Rubber cord
- Plastic track (found in wiring section of the hardware store)
This works by simply pressing the envelope into the channel of the track with the rubber cord.
I have in mind a side opening bag with a magnetic seal but this is far to complex for a first attempt at a vac bed.
One way valve:
The purpose of the one way valve is so that one can turn off the vacuum pump (this case a shop-vac) and have the vacuum inside the bed remain. A crude valve is a flap of rubber that sits on top of an airway allowing air to pass in only one direction. This works because in the flow direction air can easily pass beneath the flap. In the stop direction air will push the flap closed blocking the airway.
This ended up having two solutions. First was a double flap valve that I made myself. Second and far more effective was to use the exhaust valve from the mask (see below for mask)
- cut two circular pieces of acrylic to fit inside a pipe coupling.
- drill a centre hole to mount the flap
- drill a number of larger holes for air flow.
- Cut a circular piece of rubber and put a hole in the centre
- Mount the rubber flap on the acrylic (I used a Chicago screw)
- Be sure the screw is tight enough to hold the flap in place but not squeezing the rubber. If squeezed the rubber will pull away from the acrylic and not seal.
- Use a drop of thread locker or super glue to prevent the screw from coming apart
- Mount your new valve inside a pipe coupling and seal it (bit of silicone calk woks great here)
Problems encountered with Plan A:
- Thick rubber does not close to seal. (fixed by switching to thin latex)
- Acrylic does not dry seal well (fixed by using some calk)
- Screw head and flap lost to vacume (fixed by letting thread locker cure or use superglue) (yes I did think ahead on this one just was not patient enough)
- Flap pulls away from acrylic (fixed by making sure lose fit; do not stretch rubber flap)
- Use exhaust assembly from the mask
- This happened to fit perfectly in the end of the 2’’ pvc pipe
- Stick this in the end of your tee and add a small bit of pipe to hold it there and done.
- Can mod this by adding rubber O ring to improve seal or make a unit with a coupling and some pipe bits calk and glue for good seal.