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Home Made Sandblaster
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<blockquote data-quote="TriHonu" data-source="post: 14414" data-attributes="member: 897"><p>I have found that pressures above 100 will significantly increase the wear in inexpensive ceramic and cast iron nozzles. The nozzles will wear away quite quickly. Too much pressure can also destroy the media by causing it to shatter when it strikes the surface. Silica Sand has sharp edges that will break away to expose a new sharp edge. However you can shatter the grains turning them to dust if the pressure is set too high. I can usually get 3-4 uses from Silica Sand before I pitch it, if I keep the pressure below 100 psi.</p><p>Higher pressures normally will require a Tungsten/Boron-Carbide nozzles. You can get the smaller ones for less than $50. I have tried making my own steel and cast iron nozzles. They may be cheap, but they don't last very long. I even made one out of a hardened pressure washer nozzle. It wore away pretty quick also. <img src="https://www.skidsteerforum.com/DesktopModules/AdverForums/ImageGallery/emotion-8.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p>Remember blasting is abrading away the surface and increased pressure does not always mean increased performance. Increasing the volume of sand and air will increase the cutting speed. You also need to pay attention to the angle the abrasive is striking the surface. Change the angle of attack to find the best cutting action.</p><p>A friend of mine worked as a commercial blaster. They used big screw compressors that only put out about 100 psi but they were pushing over 400 cubic feet per min. That is well over a ton of sand per hour. You should see how fast they cut, it is all about the volume. He has one of their old compressors and sand pots out at his farm. He is using sand right from their field. The sand is nothing special but at that volume it still works well.</p><p>This <a href="http://www.nortonsandblasting.com/blastingchart.pdf" target="_blank"><span style="color: #0000ff">Blasting Chart</span></a> will give you approximate air requirements and square feet per hour for different size nozzles.</p></blockquote><p></p>
[QUOTE="TriHonu, post: 14414, member: 897"] I have found that pressures above 100 will significantly increase the wear in inexpensive ceramic and cast iron nozzles. The nozzles will wear away quite quickly. Too much pressure can also destroy the media by causing it to shatter when it strikes the surface. Silica Sand has sharp edges that will break away to expose a new sharp edge. However you can shatter the grains turning them to dust if the pressure is set too high. I can usually get 3-4 uses from Silica Sand before I pitch it, if I keep the pressure below 100 psi. Higher pressures normally will require a Tungsten/Boron-Carbide nozzles. You can get the smaller ones for less than $50. I have tried making my own steel and cast iron nozzles. They may be cheap, but they don't last very long. I even made one out of a hardened pressure washer nozzle. It wore away pretty quick also. [IMG]https://www.skidsteerforum.com/DesktopModules/AdverForums/ImageGallery/emotion-8.gif[/IMG] Remember blasting is abrading away the surface and increased pressure does not always mean increased performance. Increasing the volume of sand and air will increase the cutting speed. You also need to pay attention to the angle the abrasive is striking the surface. Change the angle of attack to find the best cutting action. A friend of mine worked as a commercial blaster. They used big screw compressors that only put out about 100 psi but they were pushing over 400 cubic feet per min. That is well over a ton of sand per hour. You should see how fast they cut, it is all about the volume. He has one of their old compressors and sand pots out at his farm. He is using sand right from their field. The sand is nothing special but at that volume it still works well. This [URL='http://www.nortonsandblasting.com/blastingchart.pdf'][COLOR=#0000ff]Blasting Chart[/COLOR][/URL] will give you approximate air requirements and square feet per hour for different size nozzles. [/QUOTE]
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