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What Compressor For Shot Blasting


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#1 olly33

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Posted 27 March 2014 - 11:09 PM

Hi,I have a spot blaster that i want to use to strip the paint from some of the mini parts.I currently using a pot type with a compressor that is 2hp,but the aluminium oxide grit i had was just not rough enough, and would take an age just to strip all the paint off the rad fan.(metal type)

 

So i got some thicker,rougher glass grit that should work in my spot blaster,but it will not blast out the gun,i am wondering if its due to the compressor not having enough power,or even the air deliver tube to small,or something else entirely??

 

Some specs from the compressor: 1.5kw/ 2hp,  50 litres tank,Speed 2850rpm

cheers olly.


Edited by olly33, 27 March 2014 - 11:09 PM.


#2 RedRuby

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Posted 28 March 2014 - 12:07 AM

I honestly don't know too much about shot blasting equipment, so I am guessing here, yes I suppose it could be the compressor power but it could also be that the nozzle size is too small for the larger glass shot and is blocking up, possible larger size nozzle needed.

#3 bikewiz

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Posted 28 March 2014 - 12:16 AM

Bigger is better with a compressor more CFM more power. I found the smaller tips worked better with my small suction feed gun, the bigger tips just shot  the media out with less cut. Make sure you have the air as dry as possible just a water separator won't keep the air dry enough, your media will clump up and jam up the tip. In US size I use a 80gal 220v/5hp15cfm 2 stage compressor that will run just about any thing.



#4 dolph

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Posted 28 March 2014 - 09:39 AM

What size nozzle you running? For a hobby type pot with 3mm nozzle then a medium grade grit is the most course that will pass. Althought some grit manufactures will grade the grit slightly different.
Ideally you the bare minimum you want is a 3hp comp with 14cfm and make sure your fittings aren't restricting airflow.
Your comp will struggle, but will be ok on small parts if you give it time to catch up

#5 olly33

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Posted 28 March 2014 - 10:30 PM

The nozzle is about 5-8mm and found that it would suck up so far,but stop. I tried a smaller grit today and it did blast the metal but would take some time to do this,even on smaller parts.

Perhaps if i changed to a smaller nozzle,like you said 3mm i might get better,speedy job done.

 

its the hobby type pot from Aldi,a Workzone spot blaster.


Edited by olly33, 28 March 2014 - 10:31 PM.


#6 Daz1968

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Posted 29 March 2014 - 12:02 AM

I have a spot blaster and it works ok on my 3hp compressor but didn't stand a chance with my old 2hp one, and as stated above you really need to come straight off the tank and not through the restrictive standard regulator on most compressors also use a minimum 3/8 dia hose to feed it and make sure air is dry.

#7 danny79

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Posted 29 March 2014 - 01:00 AM

it's all about the size of the nozzle for what cfm you compressor has.

 

The size of nozzle you require depends on the output cfm of your

compressor and the surface you are cleaning. There is an optimum nozzle for each size of

compressor to achieve full pressure (100 psi). There are however many occasions where you

simply do not need full whack output…. 60 or 70 psi is often quite sufficient for cleaning

stone, brick or wood. The chart below is self explanatory………

 

 

113blast%20gun%20chart-900x900.jpg

 

 

100 psi : Required for corroded or painted iron & steelwork, & to

remove millscale. To clean hardwoods, and painted

stone & brickwork.

 

80 psi : Required to lightly etch steelwork, and to clean heavily

soiled stone & brickwork.

 

60 psi : To clean lightly soiled stone & brickwork, softwoods, and

to etch bright metals.



#8 olly33

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Posted 29 March 2014 - 11:05 PM

How do I find out what cfm the compressor has?,cheers

#9 Captain Mainwaring

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Posted 30 March 2014 - 12:32 AM

How do I find out what cfm the compressor has?,cheers

Read the compressor rating plate - but at a guess that's not going to be good for much more than about 6 CFM.



#10 olly33

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Posted 30 March 2014 - 08:41 PM

Only got this info.

#11 Daz1968

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Posted 30 March 2014 - 10:11 PM

I have heard that a good benchmark is 3cfm fad per hp, so as post above about 6cfm.




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