This is a how to instructional video on how to make a pretty good performing paint sprayer from two plastic bottles, a couple of straws, and some PVC pipe.
The paint sprayer will require some sort of compressed air. My design in this video requires a shop vac that can blow. One could also use an air compressor or some other sort of blower such as a mattress inflater.
I came up with this specific design while playing and experimenting in my garage. My design allows the paint to be aerosolized by the compressed air giving an even conical spray pattern. This is due to the position and orientation of the straws. I found that when the "sipper" straw is cut at a 45 degree angle and faces the oncoming compressed air, it produces the best results. The spray nozzle also must not extend too far past the sipper otherwise splatter will occur.
This paint sprayer requires a bubble tea straw (fat straw), a normal drinking straw, two ~6 inch sections of 1 1/4" Plastic PVC pipe, and two plastic bottles. 1 Liter sizes seem to work best but it can be scaled up or down. The plastic bottle should have about a 1" diameter neck and should be flexible enough to squeeze.
This paint sprayer can handle out of the can latex paint without needing any dilution with water. Just ensure the paint is properly mixed.
The great advantage of this design is that it is incredibly cheap to make, allows ease of refilling, and ease of cleanup (simply throw the bottle away and make a few more bottles with spray nozzles for next time).
When using the paint sprayer, the paint should be mixed and funneled into the plastic bottle. The cap/nozzle should be firmly attached and the bottle secured to the handle via a rubber band.
To operate the paint sprayer, the paint sprayer is held bottle side towards the ground. The shop vac is then turned on. When ready to paint, the paint sprayer is turned upside down so the bottle faces the sky. Then the bottle is lightly squeezed to dispense the paint in order to spray it. When done spraying, the spray gun must be turned bottle side down before the air is shut off in order to prevent paint spatter as the shop vac slows down.
If water like consistency paint is being sprayed, you can use the same
nozzle configuration but it may be more advantageous to use a coffee stirrer straw as the sipper and a regular sized straw as the air nozzle. Also if thin paint is used, you can extend the sipper straw so it reaches towards the bottom of the bottle and also drill an extra hole at the bottle cap for an air hole. This way the thin paint would be dispenses solely from the venturi effect and the paint sprayer would not have to be turned upside down and squeezed. Or yet another option is to omit the air hole, extend the straw to the bottom of the bottle and squeeze the bottle while it is still oriented towards the ground.
An important reminder is to ensure that the paint sprayer is attached to the blowing side of the shop vac and not the suction side. Otherwise, the shop vac will suck all the paint out of the bottle and into the shop vac.
This design isn't limited to spraying paint. One could spray varnish, stain, oil, or fuel (flamethrower?)... as in a waste oil furnace configuration.
13 янв 2018
