Sandblasting

Tripp

Member
I have a late styled John Deere B that I want to prepare the hood for priming and finishing. I want to sandblast the hood but I'm not sure if it's safe to blast it without warping. Any experience sandblasting one of these with a pressure blaster and getting any warpage or is it safe?
 
I blasted all of the sheet metal for my Oliver 70 with no sign of any warping, but that was with a siphon blaster. I wouldn't be afraid to try it, just start off with the pressure a little to the low side.
 
I do all my tractor sheet metal with small pressure blaster at around 70-80 lbs. Does the job great and zero warpage.
 
You would be safe with any home model sandblaster. If you do it over a large tarp you can recycle the sand. Just sift it through some screen wire.
 
" Waterloo" don't know if they even make them anymore. (1988) but all the 80-100 lb capacity pressure pots are pretty much the same. Check www.eastwood.com.
 
Just for fun one time I took aiece of light scrap tin and hit it with the sandblasted to see if it would warp. It did warp so I played around with it making it warp back and forth. I think anyone who does sandblasting should play around with this so we get a feeling for what the limitations are.
 
(quoted from post at 17:30:19 03/15/15) I think the issue with warping is not heat, but the peening action on that side.
ingo!! Type of media used makes a huge difference. Steel shot is probably the hardest on thin metal and crushed walnut shells the easiest.
 
Sandblasting is like painting, "Don't stay in one spot" keep the tip moving. You can always come back more than once to remove stubborn or thick paint. I have blasted tractors for 25 years and never had a problem with warping. Always ran a steady 100 psi to my home made pressure pot blaster. I used a 125 CFM gas powered compressor. It worked wonderful. Pressure under 80 psi and you'll be wasting your time and sand. Be sure to wear proper PPE-Personal Protection Equipment. A good respirator and blasting hood is a must!!
 
I sand blast all of the small parts at home in my cabinet. Anything large, fuel tank, hood or fenders goes to my local powder coating company. They sandblast for a very reasonable rate. They have different types of media for use on sheet metal verses heavy steel. By the time I buy three or four 90lb bags of media spend all the time blasting and then cleaning up the mess, it is well worth it.
 

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