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Adjusting The Blaster For Good Results
I hooked my 50lb sandblaster up and it did not work. So, after some experimentation, here is what I found to make it work very well. On the front of the reservoir tank there is a silver metal nipple connecting the reservoir to the out-going-sand hose. On the side of the nipple is a hole. This hole is very important and what you will use to adjust your compressor. You adjust your sandblaster just like you would adjust the rich/lean setting on a carburetor. The blaster works like this. Compressed air is fed up into the gun. In the gun, there is a chamber. The compressed air shoots through the chamber with a gap between a small metal jet and a larger diameter ceramic nozzle. Because of this gap between the jet and ceramic nozzle, and the size differences in the orifices, a vacuum is created in the chamber. This vacuum creates suction, which pulls sand from the reservoir into the gun chamber, which then mixes with the out-going air stream. Problems? If you feed too much air into the chamber, the air will not be able to exhaust fast enough through the ceramic nozzle and the excess air will be forced up the sand-from-the-reservoir tube, not allowing any sand into the gun chamber to blast with. The way to tell if you are feeding your blaster with too much air, is by the hole on the side of the metal nipple. If air is exhausting out of the side hole, then your air pressure is too high. If your air pressure is neutral, then there will not be any air coming out the side hole in the nipple, or going in. If your air pressure is just right, there will be a vacuum on the hole which tells you the ratio is correct. Put your finger over the nipple side hole to feel the air and adjust your air pressure according. My instruction sheet says the blaster needs 90 lbs of pressure. My blaster will not work @ 90 lbs, but with a consistent pressure of 70 lbs, it works very well. Without a consistent flow, if I just go with the pressure range of the compressor turning on and off, the kick-in pressure and the shut-off pressure present a range too wide for the blaster. I need to hold steady at 70 lbs. I am using 30/60 Black Diamond blasting medium (coal ****) and getting excellent results. Water contamination needs to be avoided. My pressure gauge @ 70 lbs may not be accurate so adjust your pressure by what is happening at the hole in the side of the nipple, and I suspect your blaster will work well. And one more thing, occasionally I would get a little water up in the gun, which would stop the sand flow. So, I took the reviewer ?Oldvolks? suggestion and pulled my ceramic nozzle out so it now protrudes three sixteenths past the end of the gun. This made a big difference in the amount of suction at the side hole in the nipple (and in the gun) which almost eliminated the problem of water plugging up the system. In a half hour of blasting, I had to put the tip of the gun against something and pull the trigger, to back flush the sand tube about three times because of water contamination, but that takes seconds and the entire system now works better than I ever expected. Good luck. The only reason I gave it a 4 star rating instead of a five star rating, is because the instruction sheet was grossly inadequate so I had to figure out the above by myself, with the help of other reviews.
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DO NOT BUY THIS SANDBLASTER!!
I bought this sandblaster, along with approved sand for it called black beauty. I tried to use the blaster with a BRAND NEW 60 gallon air compressor and it did nothing. I used all three tips and still. nothing.. It wouldn't even remove cheap spray paint let alone rust!! Do not waste your money, thinking you're getting a good deal... you are not!