What is garnet?

[Michael Horowitz]

With reference to sandblasting, what is garnet? - Mike

[Morgans[_2_]]

"Michael Horowitz" > wrote in message
...
> With reference to sandblasting, what is garnet? - Mike

It is a mineral that is very hard, and is one of the more common choices of
grit found on sandpaper.

I'm no expert on sandblasting, but I believe it is only used when the job
calls for very aggressive removal, such as very rusty or heavily painted
THICK steel.

Typically NOT aircraft. :-)
--
Jim in NC

[Michael Horowitz]

we;;, there goes the planned visit to TSC :)
I'm wondering if I' m just not using this handheld blaster correctly;
sand works but oh, so slow - Mike


On Sat, 1 Nov 2008 06:01:12 -0500, "Morgans"
> wrote:

>
>"Michael Horowitz" > wrote in message
...
>> With reference to sandblasting, what is garnet? - Mike
>
>It is a mineral that is very hard, and is one of the more common choices of
>grit found on sandpaper.
>
>I'm no expert on sandblasting, but I believe it is only used when the job
>calls for very aggressive removal, such as very rusty or heavily painted
>THICK steel.
>
>Typically NOT aircraft. :-)

[Morgans[_2_]]

"Michael Horowitz" > wrote in message
...
> we;;, there goes the planned visit to TSC :)
> I'm wondering if I' m just not using this handheld blaster correctly;
> sand works but oh, so slow - Mike

You using a unit run off of a 3 HP or smaller air compressor? That is just
a toy, meant for small parts.

Like another poster said, the garnet leaves stress in parts, especially
aluminum, so I have heard.
--
Jim in NC

[Michael Horowitz]

Hello Jim - Craftsman 5 HP, 20 gal tank capable of 150 psi but I've
only been able to get it to 125.
Do you think I'm fooling myself? I know SB takes a lot of air - Mike



On Sat, 1 Nov 2008 07:37:10 -0500, "Morgans"
> wrote:

>
>"Michael Horowitz" > wrote in message
...
>> we;;, there goes the planned visit to TSC :)
>> I'm wondering if I' m just not using this handheld blaster correctly;
>> sand works but oh, so slow - Mike
>
> You using a unit run off of a 3 HP or smaller air compressor? That is just
>a toy, meant for small parts.
>
>Like another poster said, the garnet leaves stress in parts, especially
>aluminum, so I have heard.

[Capt. Geoffrey Thorpe]

"Michael Horowitz" > wrote in message
...
> Hello Jim - Craftsman 5 HP, 20 gal tank capable of 150 psi but I've
> only been able to get it to 125.
> Do you think I'm fooling myself? I know SB takes a lot of air - Mike

Real horsepower or Sears horsepower? If it runs on 110 volts, you aren't
getting 5 HP.

The maximum pressure is irrelevent.

You can do some sandblasting on a 110 volt compressor, but it's pretty much
limited to small parts and you have to take a break every now and again to
let the compressor catch up.


What are you trying to clean up?

--
Geoff
The Sea Hawk at Wow Way d0t Com
remove spaces and make the obvious substitutions to reply by mail
When immigration is outlawed, only outlaws will immigrate.

[Morgans[_2_]]

"Michael Horowitz" > wrote in message
...
> Hello Jim - Craftsman 5 HP, 20 gal tank capable of 150 psi but I've
> only been able to get it to 125.
> Do you think I'm fooling myself? I know SB takes a lot of air - Mike

Yep, 'fraid so.

Craftsman ALWAYS over rates their power tools. It probably uses 13 - 15 amps
at 110 V. That's 2 HP to most others.

Any blasting with that is low volume and low pressure, with lots of waiting.
--
Jim in NC

[Michael Horowitz]

This isn't electric; Honda engine ; does that make a diff? = Mike


On Sat, 1 Nov 2008 15:35:33 -0400, "Capt. Geoffrey Thorpe" <The Sea
Hawk @See My Sig.com> wrote:

>"Michael Horowitz" > wrote in message
...
>> Hello Jim - Craftsman 5 HP, 20 gal tank capable of 150 psi but I've
>> only been able to get it to 125.
>> Do you think I'm fooling myself? I know SB takes a lot of air - Mike
>
>Real horsepower or Sears horsepower? If it runs on 110 volts, you aren't
>getting 5 HP.
>
>The maximum pressure is irrelevent.
>
>You can do some sandblasting on a 110 volt compressor, but it's pretty much
>limited to small parts and you have to take a break every now and again to
>let the compressor catch up.
>
>
>What are you trying to clean up?

[Michael Horowitz]

This isn't electric; Honda engine ; does that make a diff? = Mike


On Sat, 1 Nov 2008 16:38:17 -0500, "Morgans"
> wrote:

>
>"Michael Horowitz" > wrote in message
...
>> Hello Jim - Craftsman 5 HP, 20 gal tank capable of 150 psi but I've
>> only been able to get it to 125.
>> Do you think I'm fooling myself? I know SB takes a lot of air - Mike
>
>Yep, 'fraid so.
>
>Craftsman ALWAYS over rates their power tools. It probably uses 13 - 15 amps
>at 110 V. That's 2 HP to most others.
>
>Any blasting with that is low volume and low pressure, with lots of waiting.

[Morgans[_2_]]

"Michael Horowitz" > wrote in message
...
>
> This isn't electric; Honda engine ; does that make a diff? = Mike

Probably a little, but it is still in the "small compressor" class.

Real sandblasting systems are usually run by 4 cylinder or larger engines,
and move many times more CFM. They also shoot a lot more blasting media per
minute, most likely.

If you are really wanting to do a large job, rent one, or hire a
sandblasting outfit. You will be ahead on aggravation and time.

If you are only going to do small parts and such, take your time, and enjoy!
<g>
--
Jim in NC

[Michael Horowitz]

On Sun, 2 Nov 2008 07:33:48 -0500, "Morgans"
> wrote:

>
>"Michael Horowitz" > wrote in message
...
>>
>> This isn't electric; Honda engine ; does that make a diff? = Mike
>
> Probably a little, but it is still in the "small compressor" class.
>
>Real sandblasting systems are usually run by 4 cylinder or larger engines,
>and move many times more CFM. They also shoot a lot more blasting media per
>minute, most likely.
>
>If you are really wanting to do a large job, rent one, or hire a
>sandblasting outfit. You will be ahead on aggravation and time.
>
>If you are only going to do small parts and such, take your time, and enjoy!
><g>

\love your attitude - Mike

[Stealth Pilot[_2_]]

On Sat, 01 Nov 2008 13:18:47 -0400, Michael Horowitz
> wrote:

>Hello Jim - Craftsman 5 HP, 20 gal tank capable of 150 psi but I've
>only been able to get it to 125.
>Do you think I'm fooling myself? I know SB takes a lot of air - Mike
>
>
>
>On Sat, 1 Nov 2008 07:37:10 -0500, "Morgans"
> wrote:
>
>>
>>"Michael Horowitz" > wrote in message
...
>>> we;;, there goes the planned visit to TSC :)
>>> I'm wondering if I' m just not using this handheld blaster correctly;
>>> sand works but oh, so slow - Mike
>>
>> You using a unit run off of a 3 HP or smaller air compressor? That is just
>>a toy, meant for small parts.
>>
>>Like another poster said, the garnet leaves stress in parts, especially
>>aluminum, so I have heard.

you would need 3 of those compressors all joined together with T
pieces to get anywhere near continuous air.

been there done that. beadblasting the auster fuselage took 6 weeks
with 3 compressors.

can I suggest that you investigate trailer mounted diesel compressors
of the type made by broomewade.
you will need to brew up some adapters but the trailer mounted
compressor *will* give continuous air at full pressure.

your other problem is concerning the air pressure of your compressor.
120psi will see grunge and corrosion removed quite well.
110psi will only remove corrosion if you play the gun over the part
continuously.
80psi is a waste of time.

my mate ant took my advice and bead blasted his entire sonerai in 1
day and had it painted in that same day.
he reported needing to stop to sweep up the ballotini( you use it time
and time again) but never needing to stop for air to pump up.

Stealth Pilot

[Capt. Geoffrey Thorpe]

"Michael Horowitz" > wrote in message
...
> This isn't electric; Honda engine ; does that make a diff? = Mike
>

You are more likely to get close to the rated hp in that case. So you
probably have about twice the air flow that I have (that's the real number
to look at SCFM @90 PSI when you compare compressors).

I do small stuff - but as I said - it takes a lot of stop start.

One other note - be sure you are wearing good dust protection - lots of law
firms like to get a piece of a lawsuit if you can blame someone else for
your silicosis... http://en.wikipedia.org/wiki/Silicosis


--
Geoff
The Sea Hawk at Wow Way d0t Com
remove spaces and make the obvious substitutions to reply by mail
When immigration is outlawed, only outlaws will immigrate.

[Morgans[_2_]]

"Stealth Pilot" > wrote

> can I suggest that you investigate trailer mounted diesel compressors
> of the type made by broomewade.
> you will need to brew up some adapters but the trailer mounted
> compressor *will* give continuous air at full pressure.
>
> your other problem is concerning the air pressure of your compressor.
> 120psi will see grunge and corrosion removed quite well.
> 110psi will only remove corrosion if you play the gun over the part
> continuously.
> 80psi is a waste of time.

The other part of the equation is the question of what the sandblaster type
is, and what the size of the unit is, and the CFM recommendation.

If it is a small unit meant for home hobby use, it likely is deficient for
larger jobs in several ways.

1) Size of blasting media hopper. Small, too small, most likely.
2) Type of feed from the hopper to the gun. Suction hoppers are usually a
pain in the butt, clogging up, not feeding quickly enough. Gravity feed
better, pressure feed even better.
3) Size of the gun and nozzle. Small air nozzle and media feed will still
only do a very small area, no matter how big the compressor, even so you
never have to wait.
4) Nozzle material used in its construction, and how easy (and expensive)
the nozzle is to replace.

Like someone else said, take care to protect yourself from the dust, and
even the dust you shake off as you are taking off the protective equipment.
It can do very bad things to you, no doubt.

Mike still has not said what he wanted to blast, has he? I wonder how heavy
he needs to go?

Could be time for a home brew compressor made from an engine running on half
of the cylinders, and pumping air with the other cylinders. I've always
wanted to do that, but you would have to have quite a bit of use for it
planned, to justify the money and effort to make one.

I have done the multiple air compressors tied together for painting with a
HVLP gun, and it wasn't bad. Waiting sucks, and waiting for air while you
are painting and trying to keep a wet line is even worse!

That said, the demands of all but the smallest of sandblasters are much
higher than a paint gun.
--
Jim in NC

[Highflyer]

"Michael Horowitz" > wrote in message
...
> Hello Jim - Craftsman 5 HP, 20 gal tank capable of 150 psi but I've
> only been able to get it to 125.
> Do you think I'm fooling myself? I know SB takes a lot of air - Mike
>
>
Mike,

Crapsman is kidding about the 5 HP. A true 5 HP compressor would pull 5000
watts. One horsepower is 746 watts,
and the conversion is never 100%! We always figured about a kilowatt of
input to get one horsepower output. My
5 HP compressor requires at least a 220 volt circuit and pulls 25 amps at
220 volts. To get 5 HP on 110 volts would
require about 50 amps. They measure the current with the motor stalled to
get their horsepower numbers. You can't
run them that way, they would burn up in minutes! Besides, the breaker
will blow. But for a few seconds there, you
were pulling 5000 watts in that little compressor! :-)

Highflyer
Highflight Aviation Services
Pinckneyville Airport ( PJY )