Keith, I agree with John.
Sandblasting can harm some parts if it isn't done right. "Sand" is
sharp-edged silica and with enough air pressure, it will cut & remove
metal-- not desirable in most cases. Using lower pressure will help
reduce metal abrasion as will using "recycled" sand; its sharpest
corners have been knocked off by previous use.
Sandblasting a thin metal panel will form a big dish in it. Some nice
cars have been ruined by over-enthusiastic use of a sandblaster.
BTW, when you are blasting with anything but dynamite, USE A DUST MASK.
I almost killed myself once with a sandblaster when I didn't use one. My
lungs felt awful for months after that.
Regards, Neil Tucson, AZ
-----Original Message-----
From: owner-land-speed@autox.team.net
[mailto:owner-land-speed@autox.team.net] On Behalf Of John Szalay
Sent: Tuesday, February 24, 2004 11:05 AM
To: land-speed@autox.team.net
Subject: Re: Sand blasting Power coat
At 10:59 AM 2/23/04 -0600, Keith Turk wrote:
>Okay so I was a bit overly optimistic on how well that sand blasting
thing was
>going to do on the chassis... that my friends is a radical
understatement....
>you can blast to your hearts content.. and Nothing or dang little will
>happen...
>Keith
Well, Yes & No
the degree of effectiveness varies with the type & grade of grit and
the
air pressure driving the grit.
we used to use glass beads to remove paint without damaging the
underlying
metal.
for removing porcelain enamel overspray already bonded to the oven
hangers
we used a very hard grit. a little of that grit would cut right thru
sheet metal
( eats the dickens out of the spray nozzles too)
I've seen metal bent by playing too long on a spot or area, expanding
the metal
same as use of a ball peen hammer.
We even used that technique to expand metal plugs into a hole in sheet
metal.
(learned that from a old welder that used to work for the Naval Ordnance
station
here in Louisville,
He worked that out, to fill holes in armour for the gun mounts they
reworked.
expand it with shot blasting and then weld , that reduced the tendency
to crack
in the high strength armour/steel.)
Also used sand blasting to drill holes in tempered glass.
( boy, this list brings back a lot of memories of years in machine
shop.)
|