[AT] Sandblasting

Dennis Johnson moscowengnr at outlook.com
Sun Apr 10 11:42:51 PDT 2016


Charlie

Tried the acid first. Did fair, but not great. Not sure wire would've do as well getting mill scale off any the rust in the pits on the pipe.
Now that I have a pressure blaster working it is going a lot faster and result is a "near white metal blast" as I recall.

Thanks
Dennis

Sent from my iPad

> On Apr 10, 2016, at 11:31 AM, charlie hill <charliehill at embarqmail.com> wrote:
> 
> A good wire wheel on a side grinder will give you good results a lot
> cheaper and probably faster than sandblasting it unless you had access
> to some professional grade blasting equipment.  If the rust is just loose
> surface rust and not caked on you can get good results by painting it
> down with some phosphoric acid, rinsing it off and letting it dry.  Then 
> paint.
> 
> Charlie  (over 20 years experience in the sand blasting and industrial 
> painting industry)
> 
> 
> 
> -----Original Message----- 
> From: Dennis Johnson
> Sent: Saturday, April 09, 2016 9:33 PM
> To: at at lists.antique-tractor.com
> Subject: [AT] Sandblasting
> 
> I am making a holder for some 4' X 8' banners to advertise various church 
> events. Will mount in ground so it can be seen from the road. I got some old 
> 1 1/2" pipe and welded it up. Then I tried to blast the rust and scale off 
> of the pipe so I could prime and paint it.
> I had an old suction type blaster, that seemed to work fair for a few 
> previous projects. It started working fine for this, and then quit working. 
> I replaced the blast gun, and it blasted about 6" of pipe and quit.
> I got frustrated and went out and got a 40 pound pressure blaster from 
> Harbor freight, plus another air compressor. I have one compressor that is 
> about 6  or 7 CFM with a 30 gallon tank. Found another "free" compressor 
> that is a real small compressor guessing about 2 CFM but was mounted on a 60 
> gallons tank. Found Harbor has a compressor sale with one that was $179 
> after $319 off (something my wife can understand) so I got that. It is 4 or 
> 5 CFM with a 20 gallons tank. Got all of these connected together and have a 
> small discharge manifold I put on my shop wall.
> Got the blaster assembled, put some sand in it, and it did terrible, barely 
> blasting. Finally figured out the sand I had was contaminated with small 
> rocks that plugged things. (Probably also the reason the suction blaster was 
> not working). Went and got some insect screen, and used it as a sieve to 
> screen out the rocks from the sand. Put in the the fresh sieved sand, and 
> the blaster started working like it was supposed to. Worked great for a bit, 
> and then blew of blast hose. Short trip to parts store for new clamps, and 
> then it was working great again. Guessing a 50 pound bag of play sand will 
> blast 10 to 12 feet of pipe.
> After I get this blasted I need to fix a few things on the blaster like 
> disassemble and rotate the handles that came installed backwards.
> Anyway I am happy that I now have a blaster that works great, plus enough 
> compressors and tanks to blast about 5 or 6 foot of pipe at one time, and 
> then shut down the blaster and prime that section while the compressors 
> catch up.
> Grit would be better, but this sign holder is about 10' high, with two sides 
> that are about 10' long spaced at 90 degrees, so the outside pipes are about 
> 16 foot apart. Point is that it is too big to blast where I can save and 
> recycle the grit and sand is cheaper.
> Sent from my iPad
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