Sandblaster - Corn Cobs

I was thumbing through the latest Northern Hydraulic catalog and stopped at the sandblasters. There are quite a few choices but what caught my eye was the ground corn cobs as a material to use. Have any one used ground corn cobs in your sandblaster to remove rust? What kind of results have you had? I don't have alot to sandblast, but what would be a good smaller sandblaster for me to buy? Thank you in advance!!
 
Corn cob is more of a medium to polish stuff. If you reload your ammo you polish the brass with COB. Rust is VERY hard and I doubt cob would even touch it. Sandblast is sandblast and that means sand. NOW if you take one of those little hand held blaster toys you can use baking soda in it to remove soft material. Paint will come off very nicely and not heat the metal. The heat will make metal warp. Cob will most likely plug a blaster up cause it doesn't flow. Try it in one of those little hand held ones cause they have very big holes and rely on air flow to work. Your other choice is crushed wall nut. That stuff is pretty mean. But not for rust.
 
Corncob is ideal for soft metals such as Copper, Soft Brass, and Soft Aluminum. It cleans them & gives them a soft, semi-gloss, burnished look. But after removing all the dust from your soft metal object, you will need to coat it with Clear Plastic (spray) or some other clear sealer, or the metal will quickly start to oxidize.


:>)
 
All I know is when we ran out of catalogs in the outhouse, those corn cobs felt pretty rough.
 
35 years ago company I worked for had a Lima Crane blasted with corn cob and painted. Line was that the cob that got into places like gear cases wouldnt grind gears and bearings. It worked as advertised, it cleaned the crane and there was a heck of a lot of it in places init really should not have been but there wasn"t any ill affects from it. Small suction tube type blasters are pretty slow, a good rule of thumb is if it wont fit in a blasting cabinet its going take a very long time to clean with one of those. Unless time leans nothing pressure pots are best for large items. Blasters of either type are pretty basic devises. Worry about price and spare parts availability as there is little else to choose from. Also worry more about having enough compressor and how your going to rid the air supply of moisture. A too small compressor and a humid day will make pure misery out of a sand blasting job. We have and old Jeager engine drive about 100 CFM that just idles with our blasters but have yet to find a cheapo moisture remover that works other than we save blasting jobs for days of low humidity or basically fall/winter in these parts.
 

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