I need some mechanical design help

[minerrick]

I'd like to run an air chisel and rotary hammer under water. I have a gast 260 air compressor for divers air, but I cannot figure out what it's capacity is and if it would have the capacity to run the hammers. The air chisels and hammer/drills require 24 cfm and 90 psi. I have a bunch of motors laying around, I don't need a big tank, but I need to cobble something together. Anyone have any ideas for me? I was looking online and new motor/air pump combos run $2k. I don't feel like spending that kind of money, especially since I have the motors, don't need the big tank, and just want to run a single hammer. Obviously, people who design that stuff don't consider carrying it on their backs. Any bootstrap guys (or gals) have any ideas?

 

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[rodoconnor]

For years I used an air chisel under water. I just ran off my hooka. The chisels are air hogs . You should have a least 2 tanks and be prepared to hold your breath. I don't know about the rota-hammer.That just may be too much. G/L

 

[Bum Luck]

I would not use the same air for my tools and breathing. maybe switchable tanks.

 

[minerrick]

I would not use the same air for my tools and breathing. maybe switchable tanks.

NO way would I run the same air for breathing, as I understand the air compressors for tools may have oil in the lines. The air I am breathing is coming from my gast only.

 

[Hoser John]

Gast will do it-install a t fitting on the air outlet at the compressor and run a reserve to you and one to the air hammer/chisel BUT the water will corrode right fast like and kill it. Get a old /new innertube ,motorcycle, and cut a bladder to fit around the tool to cover the top and leave a hole for the chisel to protrude. Retain in place with copper wire-or duct tape,whatever to keep dry as possible as escaping air will keep it dryer-not dry dry but much better. WD40 moving parts is imperative or they die. I much prefer a righteous blaster with a crevice tool but that works too. John

 

[DDancer]

You can try looking at the product spec documents for gast compressors. I took a look but did not see your 260 model~ need the whole part number. Technical Documents - Gast

Depending on how many cfm it pushes and at what pressure you may be able to rig a couple of tanks and charge them for use with the hammer and chisel. If you have high output motors you'd be best off rigging them to the tanks. You probably know this but I'll say it anyway~ use a good regulator for the tanks. My thoughts.

 

[rodoconnor]

The air I was breathing was not contaminated with oil . It came directly from my compressor [Hooka] ,T'd off. 1 line went to the tool the other to the mouthpiece. If I had been breathing contaminated air my old Valley Fever scarred lungs would have failed me for sure.

 

[russau]

make sure you have PLENTY of air storage! and a check valve between the air chisels tand and your compressor to prevent and back filling of your air breathing tank. plus youll need a pressure regulator or a pop off vavle for your air chisels tank to get enough PSI to run the chisel. and like John says , "WD-40 the beans out of the chisel after use"!

 

[Bum Luck]

make sure you have PLENTY of air storage! and a check valve between the air chisels tand and your compressor to prevent and back filling of your air breathing tank. plus youll need a pressure regulator or a pop off vavle for your air chisels tank to get enough PSI to run the chisel. and like John says , "WD-40 the beans out of the chisel after use"!

I use tool oil and 'blow it" through the tool.

 

[njcommercialdiver]

I use an ingersall rand Honda powered compresser to run airtools when I need them. they supply 9 ish cfm at 90psi which is enough to run an airchisel. tractor supply sells them brand new for $850-900. you can find some cheaper ones at homedepot but they don't last as long.

 

[Reed Lukens]

You're going to need the large air tank for reserve. Tools go through a lot of air and you either have a large reserve tank or you stop after a minute or 2 with no air and then wait 5 minutes for the pressure to build back up before you continue.

 

[njcommercialdiver]

yeah I forgot to put that detail in my post, the compressor runs into a 40ish gallon volume tank and the tools feed off that

 

[lbd]

If anyone is still interested in this thread....Use two tanks and a priority ualve used on truck braking systems... or from your pneumatics supplier.. air fills up your primary breathing air tank until full.... only then will surplus/overflow go to the second tank for your air tools when you have more than enough to breath on....

If breathing air pressure drops... air supply to the air tools tank stops.

 

[mendoAu]

I used a CO2 tank for many years with my nail guns...probable blow thru alot of tanks with an air chisel tho.