jerbacher wrote:
WoodysKJ wrote:
Most of the commercial "Media Blasters" use a ground up walnut shell instead of sand. not as bruttle on the parts and enviormentaly better.
i didnt know that! what a good idea! i'm not sure what the sand blaster we had in the shop in college was, but i was always instructed that the sand was really really bad for you and that by no means should you let it get out of the booth. so walnut shells sounds pretty good.
It is because of the paint, rust, etc that is mixed w/ the sand is the biggest reason it is bad for you. Some types of blasting media are also pretty gnarly and create a fine dust that will really mess up your lungs. I would definately suggest breathing protection if using it in the open and in a cabinet unless it is attached to a vacuum source to clear the air in the cabinet. I have a cabinet in my garage w/ a special abrasive (can't remember the name) that is nasty stuff but it works so well and leaves a fine, smooth finish but it creates some dust that if you breathe it you will regret. I wear a resperator and hook my cabinet to a shop vac w/ a fine filter before using it.
At work, to strip the B2 and other planes, they use wheat starch, mainly for environmental reasons but it does work well w/ high pressure blasters.