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Discussion Forum

Sandblasting tin

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Walt R

03-13-2002 19:47:54




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I have heard comments about metal stretch from sandblasting. Is there anything to this. I'm thinking about having the hood and cowl from a John Deere R sandblasted. Opinions and suggestions please.




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Red Dave

03-14-2002 07:33:30




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 Re: Sandblasting tin in reply to Walt R, 03-13-2002 19:47:54  
Sheet metal can stretch or warp when sandblasted due to heat generated by the blasting process.
Like Franz said, excessive pressure or dull abrasive are often the culprits. Dull abrasive will keep you in one spot too long, heat then builds up in that spot, causing the sheet metal to warp.
At work we have abrasive blasted for years using anything from steel shot to black beauty, sand and even ground up corn cobs and walnut shells depending on the application.
If you sandblast with good sharp media, at the proper pressure, you can clean your sheet metal without damaging it. If you have sombody do it that has experience, you should be OK.

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Franz

03-13-2002 23:40:44




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 Re: Sandblasting tin in reply to Walt R, 03-13-2002 19:47:54  
Most sheet metal warping by sandblasting is caused by using cheap abrasive, often recycled, and too much air pressure.
Silica sand is a single use sand, and should not be reused like a lot of people do.
Black Beauty can be cycled thru a blaster a few times and will do far more cutting than silica sand will, and at lower pressures.



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