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#Post#: 84237--------------------------------------------------
Blast it!
DIR By: Ed_gasket
Date: January 19, 2014, 5:11 pm
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Thinking of buying a small grit blasting gun from machine mart.
I have a suitable compressor and was thinking about using this
to clean up a set of wheels and strip paint from an 88 roof.
Anyone used this kit for such a task? What sort of blasting
medium? Aluminum oxide? Grade? Advice and sarcasm appreciated.
Cheers. Mike dogwalk
#Post#: 84238--------------------------------------------------
Re: Blast it!
DIR By: Rob1769
Date: January 19, 2014, 5:48 pm
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will be no good for the wheels.. have you no one local ?? where
are you place here in Scunny £5 / wheel proper job !!!! will
be ok for roof but painfully slowwwwwwwwwwwwww
#Post#: 84239--------------------------------------------------
Re: Blast it!
DIR By: lister
Date: January 19, 2014, 6:46 pm
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You could do the wheels with a twist knot wire brush and just
use the cheapo sandblaster for the fiddly bits?
#Post#: 84240--------------------------------------------------
Re: Blast it!
DIR By: Matthew
Date: January 19, 2014, 6:49 pm
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No idea on the blast apparatus itself i'm afraid.
As for the media however, generally, grit/ore/sand is used for
hard and rusty things like steel.
For small, delicate ferrous parts or the majority of aluminium
things , crushed walnut shells, plastic beads or soda granules
are used.
For really delicate bits, precious metals, brass and even
plastics and glass then the big thing now is Co2, aka dry ice
blasting. Instead of using abrasive blast media, this uses
supersonic jets of supercooled carbon dioxide that cause a mini
explosion of gas when they hit the room temperature workpiece,
dislodging the paint/oxidation/tarnishing etc from the substrate
with absolutely no effect on the substrate at all.
#Post#: 84289--------------------------------------------------
Re: Blast it!
DIR By: Austin
Date: January 20, 2014, 1:50 pm
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I have done wheels in the past in my blaster, I use steel
chippings in a pressure pot fed into a cabinet. Its not too bad
but powder coated ones take more doing. They leave quite a
coarse finish, fine for painting. I sometimes use 80g alu-oxide
for a better finish on other stuff, still nothing like smooth
though. Dunno about blasting a roof, I think it would end up all
wavy and distorted. Best to have at it with a DA or if you
really want to blast it then soda blasting might be an option.
The blasters use more air than you would think, especially the
pressurised ones. I suppose you are looking at a siphon type gun
which aren't too bad.
#Post#: 84291--------------------------------------------------
Re: Blast it!
DIR By: divie
Date: January 20, 2014, 2:15 pm
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Never used one of those blasters but just had rear wheel rim and
hub on vintage bike done. £15 including powder coating, hub
satin black/rim gloss black.Top job and I will be going back
soon with all the rest of the bike.
#Post#: 84306--------------------------------------------------
Re: Blast it!
DIR By: espacekiller
Date: January 20, 2014, 7:13 pm
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I set up a small cabinet, it is OK and handy for small stuff,
but takes (hours) ages on bigger stuff, I came to the conclusion
for big stuff Like a set of wheels it was just too slow and with
the cost of the blasting medium it started to look like a good
idea to find a cheap blasting place.
I think if you do it you need to do it BIG or restrict it to
doing small bits and find a good blasting place.
#Post#: 84344--------------------------------------------------
Re: Blast it!
DIR By: Rob1769
Date: January 21, 2014, 3:37 pm
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where are you local to?
#Post#: 84853--------------------------------------------------
Re: Blast it!
DIR By: Ed_gasket
Date: February 5, 2014, 1:48 pm
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Thank you for taking the time to reply. Some very good points. I
will resort to finding someone local for the wheels and have a
think about the other stuff. Cheers. :rolleye0012:
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