At the time of writing this post, it is the year of 2013. And although dustless sandblasting equipment has been available for many years now, it seems to be all the rave these days. Over the past few months, I have received an enormous amount of emails from people asking about it. Before I ramble on too much, let me first explain what these units are and how they work.
What is Dustless Sandblasting?
The name “dustless sandblasting” could be used to describe a few equipment types used to control dust such as my plans that show how to make a dust free on-site unit, or the other wet sandblasting unit listed here. But in the industry, dustless sandblasting is commonly referred to the unit that uses compressed air to propel a water and abrasive mixture. The other types don’t use all three of these components.
It works in a similar manner as the dry pressure pot sandblasting equipment, except it is designed differently to prevent the water from clogging up the abrasive flow.
How it is Designed?
Eventually, I plan on experimenting and making my own by using “some” of the basic steps I wrote in this ebook here. After viewing videos of the dustless sandblasters operating, examining part diagrams, and discussing it with Don P. (an email subscriber) who knows someone that has one, we figured out that it is designed and works in the following notes:
- Overall it is like a pressure pot with a sealed container that holds the water mixed in with the abrasive (often glass beads).
- The intake and exit ports are positioned on the exact opposite sides in comparison to the dry abrasive blasters. First, the compressed air goes in from the bottom and then the mixture of abrasive, air, and water flows out of the top. This flow path prevents the abrasive from clogging.
- It is designed with an upside down cone shaped valve located at the bottom which releases the air up into a metal tube. There is a small gap inbetween the tube and the cone which allows a small amount of water/ abrasive slurry to seep into the air flow and then is carried out the exit port into the nozzle.
- The abrasive to air ratio coming out of the nozzle is adjusted by distancing the space between the cone and metal tube. The metal tube is adjusted at the top with the use of a lever.
- Costs: One of the reason’s that people have been emailing me about these units is because my site mostly deals with providing plans on making your own equipment and these dustless sandblasters can cost a lot of money. Even the small hobby sized units can cost $8,000!
- Uses on Metal: One of the problems with any wet sandblasting unit is that the water can create rust. Typically, a rust inhibitor solution is mixed in with the water to prevent rust from forming. I researched these and the brand I have seen used is called HoldTight 102. Feel free to search for that. I’ve found it online before.