Sandblasting is a method for finishing the surfaces of manufactured goods to make them smoother and more consistent. The process is also often called abrasive blasting. During finishing, a machine shoots sand at very high pressure across the item’s surface, and the sand abrades it.
Many companies use sandblasting to finish their products because it prepares goods for other surface finishing, like painting. It also removes residue from manufacturing and can help soften sharper edges.
How a Sandblaster Works
A sandblasting machine features a gun for precision sand application. These nozzles attach to the air compressor, which can supply various pressures measured in pounds per square inch (psi). Guns must also connect to the abrasive source to draw in the sand before expelling it with compressed air.
These configurations vary but generally fall into the following three categories:
- Pressure blasters: With this configuration, the sandblasting gun attaches to the sand canister. Air and sand exit the gun together when released.
- Gravity-fed sandblasters: These styles include a gun with an attached hopper. As compressed air enters the gun, it forces the hopper open and draws the sand through the gun barrel with the air.
- Siphon blasters: This setup includes two hoses. As air flows through the first, it creates a draw in the second to pull sand from its tank and expel it through the gun.
The sand then crosses the surface at high velocity, effectively abrading it and creating a smoother finish.
Choosing a Compressor for Sandblasting Applications
Many considerations go into choosing the ideal compressor for your specific sandblasting application.
Size
Smaller jobs generally require a compressor producing movements between 10 and 20 cubic feet per minute (cfm). In contrast, industrial sandblasting projects may need 50 cfm or higher-rate compressors. The specific good you’re finishing is the best guide for choosing the right cfm range.
Efficiency
Sandblasters are most efficient when they produce 90-100 psi, and it’s best to choose a compressor capable of achieving that consistently. Working with a smaller compressor is possible but will add time to your project — you may have to pause and wait for the compressor to catch up.
Nozzle Types
Determine the nozzle size based on the size of your project surface. Larger surfaces typically require bigger nozzles. The larger your nozzle, the higher the cfm your compressor must produce. Choose a tinier nozzle and opening for precision on smaller projects with tighter blast patterns.
Power Sources
Sandblasting machines require power for the compressor, and you must consider your facility limitations. For the home hobbyist, a machine running on 120 volts of electricity is likely ideal. Industrial sandblasters often use 240 volts. Gas-powered models are also available.
Location
Finally, consider where you’ll be using the sandblaster. For example, if you’re using it to remove graffiti, you’ll need a portable one versus the more permanent setups in industrial environments.
Find the Right Compressor for Your Sandblasting Project With Quincy
Since 1920, we’ve been a trusted partner to professionals looking for a high-quality air compressor for sandblasting. Our team has extensive experience and product knowledge to help you find the right one for your needs.
Explore our inventory online, visit a local dealer or connect with our specialists for advice and information.